1. General description
The 74HC138; 74HCT138 is a high-speed Si-gate CMOS device and is pin compatible
with Low-power Schottky TTL (LSTTL).
The 74HC138; 74HCT138 decoder accepts three binary weighted address inputs (A0, A1
and A3) and when enabled, provides 8 mutually exclusive active LOW outputs (Y0 to Y7).
The 74HC138; 74HCT138 features three enable inputs: two active LOW (E1 and E2) and
one active HIGH (E3). Every output will be HIGH unless E1 and E2 are LOW and E3 is
HIGH.
This multiple enable function allows easy parallel expansion of the 74HC138; 74HCT138
to a 1-of-32 (5 lines to 32 lines) decoder with just four 74HC138; 74HCT138 ICs and one
inverter.
The 74HC138; 74HCT138 can be used as an eight output demultiplexer by using one of
the active LOW enable inputs as the data input and the remaining enable inputs as
strobes. Not used enable inputs must be permanently tied to their appropriate active
HIGH- or LOW-state.
The 74HC138; 74HCT138 is identical to the 74HC238; 74HCT238 but has inverting
outputs.
2. Features
■Demultiplexing capability
■Multiple input enable for easy expansion
■Complies with JEDEC standard no. 7A
■Ideal for memory chip select decoding
■Active LOW mutually exclusive outputs
■ESD protection:
◆HBM EIA/JESD22-A114-C exceeds 2000 V
◆MM EIA/JESD22-A115-A exceeds 200 V
■Specified from −40 °Cto+85°C and from −40 °C to +125 °C
74HC138; 74HCT138
3-to-8 line decoder/demultiplexer; inverting
Rev. 03 — 23 December 2005 Product data sheet
74HC_HCT138_3 © Koninklijke Philips Electronics N.V. 2005. All rights reserved.
Product data sheet Rev. 03 — 23 December 2005 2 of 23
Philips Semiconductors 74HC138; 74HCT138
3-to-8 line decoder/demultiplexer; inverting
3. Quick reference data
[1] CPD is used to determine the dynamic power dissipation (PD in µW).
PD=C
PD ×VCC2×fi×N+Σ(CL×VCC2×fo) where:
fi= input frequency in MHz;
fo= output frequency in MHz;
CL= output load capacitance in pF;
VCC = supply voltage in V;
N = number of inputs switching;
Σ(CL×VCC2×fo) = sum of the outputs.
4. Ordering information
Table 1: Quick reference data
GND = 0 V; T
amb
= 25
°
C; t
r
= t
f
= 6 ns.
Symbol Parameter Conditions Min Typ Max Unit
74HC138
tPHL,
tPLH
propagation delay VCC =5V; C
L=15pF
An to Yn - 12 - ns
E3 to Yn - 14 - ns
En to Yn - 14 - ns
Ciinput capacitance - 3.5 - pF
CPD power dissipation
capacitance VI= GND to VCC [1] -67-pF
74HCT138
tPHL,
tPLH
propagation delay VCC =5V; C
L=15pF
An to Yn - 17 - ns
E3 to Yn - 19 - ns
En to Yn - 19 - ns
Ciinput capacitance - 3.5 - pF
CPD power dissipation
capacitance VI= GND to (VCC −1.5 V) [1] -67-pF
Table 2: Ordering information
Type number Package
Temperature range Name Description Version
74HC138
74HC138N −40 °C to +125 °C DIP16 plastic dual in-line package; 16 leads (300 mil);
long body SOT38-1
74HC138D −40 °C to +125 °C SO16 plastic small outline package; 16 leads;
body width 3.9 mm SOT109-1
74HC138DB −40 °C to +125 °C SSOP16 plastic shrink small outline package; 16 leads;
body width 5.3 mm SOT338-1
74HC138PW −40 °C to +125 °C TSSOP16 plastic thin shrink small outline package;
16 leads; body width 4.4 mm SOT403-1
74HC138BQ −40 °C to +125 °C DHVQFN16 plastic dual in-line compatible thermal enhanced
very thin quad flat package; no leads;
16 terminals; body 2.5 ×3.5 × 0.85 mm
SOT763-1
74HC_HCT138_3 © Koninklijke Philips Electronics N.V. 2005. All rights reserved.
Product data sheet Rev. 03 — 23 December 2005 3 of 23
Philips Semiconductors 74HC138; 74HCT138
3-to-8 line decoder/demultiplexer; inverting
5. Functional diagram
74HCT138
74HCT138N −40 °C to +125 °C DIP16 plastic dual in-line package; 16 leads (300 mil);
long body SOT38-1
74 HCT138D −40 °C to +125 °C SO16 plastic small outline package; 16 leads;
body width 3.9 mm SOT109-1
74HCT138DB −40 °C to +125 °C SSOP16 plastic shrink small outline package; 16 leads;
body width 5.3 mm SOT338-1
74HCT138PW −40 °C to +125 °C TSSOP16 plastic thin shrink small outline package;
16 leads; body width 4.4 mm SOT403-1
74HCT138BQ −40 °C to +125 °C DHVQFN16 plastic dual in-line compatible thermal enhanced
very thin quad flat package; no leads;
16 terminals; body 2.5 ×3.5 × 0.85 mm
SOT763-1
Table 2: Ordering information
…continued
Type number Package
Temperature range Name Description Version
Fig 1. Logic symbol Fig 2. Functional diagram
Y0
Y1
Y2
Y3
Y4
Y5
Y6
Y7 7
9
10
11
12
13
14
15A0
A1
A2
3
2
1
6
5
4E2
E1
E3
mna370
mna372
ENABLE
EXITING
Y0
Y1
Y2
Y3
Y4
Y5
Y6
Y7 7
9
10
11
12
13
14
15
A0
A1
A2 3-to-8
DECODER
3
2
1
6
5
4
E2
E1
E3
74HC_HCT138_3 © Koninklijke Philips Electronics N.V. 2005. All rights reserved.
Product data sheet Rev. 03 — 23 December 2005 4 of 23
Philips Semiconductors 74HC138; 74HCT138
3-to-8 line decoder/demultiplexer; inverting
6. Pinning information
6.1 Pinning
Fig 3. Logic diagram
001aae059
Y6
Y7
E1
E2
E3
A0
A1
A2
Y4
Y5
Y2
Y3
Y0
Y1
(1) The die substrate is attached to this
pad using conductive die attach
material. It can not be used as supply
pin or input.
Fig 4. Pin configuration DIP16, SO16,
SSOP16 and TSSOP16 Fig 5. Pin configuration DHVQFN16
74HC138
74HCT138
A0 VCC
A1 Y0
A2 Y1
E1 Y2
E2 Y3
E3 Y4
Y7 Y5
GND Y6
001aae061
1
2
3
4
5
6
7
8
10
9
12
11
14
13
16
15
001aae060
74HC138BQ
74HCT138BQ
Y7 Y5
E3 Y4
E2 Y3
E1 Y2
A2 Y1
A1 Y0
GND
Y6
A0
VCC
Transparent top view
7 10
6 11
5 12
4 13
3 14
2 15
8
9
1
16
terminal 1
index area
GND(1)
74HC_HCT138_3 © Koninklijke Philips Electronics N.V. 2005. All rights reserved.
Product data sheet Rev. 03 — 23 December 2005 5 of 23
Philips Semiconductors 74HC138; 74HCT138
3-to-8 line decoder/demultiplexer; inverting
6.2 Pin description
7. Functional description
[1] H = HIGH voltage level;
L = LOW voltage level;
X = don’t care.
Table 3: Pin description
Symbol Pin Description
A0 1 address input 0
A1 2 address input 1
A2 3 address input 2
E1 4 enable input 1 (active LOW)
E2 5 enable input 2 (active LOW)
E3 6 enable input 3 (active HIGH)
Y7 7 output 7 (active LOW)
GND 8 ground (0 V)
Y6 9 output 6 (active LOW)
Y5 10 output 5 (active LOW)
Y4 11 output 4 (active LOW)
Y3 12 output 3 (active LOW)
Y2 13 output 2 (active LOW)
Y1 14 output 1 (active LOW)
Y0 15 output 0 (active LOW)
VCC 16 positive supply voltage
Table 4: Function table[1]
Control Input Output
E1 E2 E3 A2 A1 A0 Y7 Y6 Y5 Y4 Y3 Y2 Y1 Y0
H X X X X X HHHHHHHH
XHX
XXL
L L H L L L HHHHHHHL
L L H HHHHHHLH
L H L HHHHHLHH
L H H HHHHLHHH
H L L HHHLHHHH
H L H HHLHHHHH
H H L HLHHHHHH
H H H LHHHHHHH
74HC_HCT138_3 © Koninklijke Philips Electronics N.V. 2005. All rights reserved.
Product data sheet Rev. 03 — 23 December 2005 6 of 23
Philips Semiconductors 74HC138; 74HCT138
3-to-8 line decoder/demultiplexer; inverting
8. Limiting values
[1] For DIP16 package: Ptot derates linearly with 12 mW/K above 70 °C.
[2] For SO16 package: Ptot derates linearly with 8 mW/K above 70 °C.
[3] For SSOP16 and TSSOP16 packages: Ptot derates linearly with 5.5 mW/K above 60 °C.
[4] For DHVQFN16 packages: Ptot derates linearly with 4.5 mW/K above 60 °C.
9. Recommended operating conditions
Table 5: Limiting values
In accordance with the Absolute Maximum Rating System (IEC 60134). Voltages are referenced to
GND (ground = 0 V).
Symbol Parameter Conditions Min Max Unit
VCC supply voltage −0.5 +7 V
IIK input clamping current VI < −0.5 V or VI>V
CC + 0.5 V - ±20 mA
IOK output clamping current VO<−0.5 V or
VO>V
CC + 0.5 V -±20 mA
IOoutput current VO = −0.5 V to (VCC + 0.5 V) - ±25 mA
ICC quiescent supply current - 50 mA
IGND ground current - −50 mA
Tstg storage temperature −65 +150 °C
Ptot total power dissipation
DIP16 package [1] - 750 mW
SO16 package [2] - 500 mW
SSOP16 package [3] - 500 mW
TSSOP16 package [3] - 500 mW
DHVQFN16 package [4] - 500 mW
Table 6: Recommended operating conditions
Symbol Parameter Conditions Min Typ Max Unit
74HC138
VCC supply voltage 2.0 5.0 6.0 V
VIinput voltage 0 - VCC V
VOoutput voltage 0 - VCC V
Tamb ambient temperature −40 +25 +125 °C
tr, tfinput rise and fall time VCC = 2.0 V - - 1000 ns
VCC = 4.5 V - 6.0 500 ns
VCC = 6.0 V - - 400 ns
74HCT138
VCC supply voltage 4.5 5.0 5.5 V
VIinput voltage 0 - VCC V
VOoutput voltage 0 - VCC V
Tamb ambient temperature −40 +25 +125 °C
tr, tfinput rise and fall time VCC = 4.5 V - 6.0 500 ns
74HC_HCT138_3 © Koninklijke Philips Electronics N.V. 2005. All rights reserved.
Product data sheet Rev. 03 — 23 December 2005 7 of 23
Philips Semiconductors 74HC138; 74HCT138
3-to-8 line decoder/demultiplexer; inverting
10. Static characteristics
Table 7: Static characteristics 74HC138
At recommended operating conditions; voltages are referenced to GND (ground = 0 V).
Symbol Parameter Conditions Min Typ Max Unit
Tamb =25°C
VIH HIGH-state input voltage VCC = 2.0 V 1.5 1.2 - V
VCC = 4.5 V 3.15 2.4 - V
VCC = 6.0 V 4.2 3.2 - V
VIL LOW-state input voltage VCC = 2.0 V - 0.8 0.5 V
VCC = 4.5 V - 2.1 1.35 V
VCC = 6.0 V - 2.8 1.8 V
VOH HIGH-state output voltage VI = VIH or VIL
IO=−20 µA; VCC = 2.0 V 1.9 2.0 - V
IO=−20 µA; VCC = 4.5 V 4.4 4.5 - V
IO=−20 µA; VCC = 6.0 V 5.9 6.0 - V
IO=−4.0 mA; VCC = 4.5 V 3.98 4.32 - V
IO=−5.2 mA; VCC = 6 V 5.48 5.81 - V
VOL LOW-state output voltage VI = VIH or VIL
IO=20µA; VCC = 2.0 V - 0 0.1 V
IO=20µA; VCC = 4.5 V - 0 0.1 V
IO=20µA; VCC = 6.0 V - 0 0.1 V
IO= 4.0 mA; VCC = 4.5 V - 0.15 0.26 V
IO= 5.2 mA; VCC = 6 V - 0.16 0.26 V
ILI input leakage current VI=V
CC or GND; VCC = 6 V - - ±0.1 µA
IOZ OFF-state output current VI = VIH or VIL; VO=V
CC or GND;
VCC = 6.0 V ±0.5 µA
ICC quiescent supply current VCC = 6.0 V; IO = 0 A;
VI=V
CC or GND - - 8.0 µA
Ciinput capacitance - 3.5 - pF
Tamb =−40 °C to +85 °C
VIH HIGH-state input voltage VCC = 2.0 V 1.5 - - V
VCC = 4.5 V 3.15 - - V
VCC = 6.0 V 4.2 - - V
VIL LOW-state input voltage VCC = 2.0 V - - 0.5 V
VCC = 4.5 V - - 1.35 V
VCC = 6.0 V - - 1.8 V
VOH HIGH-state output voltage VI = VIH or VIL
IO=−20 µA; VCC = 2.0 V 1.9 - - V
IO=−20 µA; VCC = 4.5 V 4.4 - - V
IO=−20 µA; VCC = 6.0 V 5.9 - - V
IO=−4.0 mA; VCC = 4.5 V 3.84 - - V
IO=−5.2 mA; VCC = 6 V 5.34 - - V
74HC_HCT138_3 © Koninklijke Philips Electronics N.V. 2005. All rights reserved.
Product data sheet Rev. 03 — 23 December 2005 8 of 23
Philips Semiconductors 74HC138; 74HCT138
3-to-8 line decoder/demultiplexer; inverting
VOL LOW-state output voltage VI = VIH or VIL
IO=20µA; VCC = 2.0 V - - 0.1 V
IO=20µA; VCC = 4.5 V - - 0.1 V
IO=20µA; VCC = 6.0 V - - 0.1 V
IO= 4.0 mA; VCC = 4.5 V - - 0.33 V
IO= 5.2 mA; VCC = 6 V - - 0.33 V
ILI input leakage current VI=V
CC or GND; VCC = 6 V - - ±1.0 µA
IOZ OFF-state output current VI = VIH or VIL; VO=V
CC or GND;
VCC = 6.0 V ±5.0 µA
ICC quiescent supply current VCC = 6.0 V; IO = 0 A;
VI=V
CC or GND --80µA
Tamb =−40 °C to +125 °C
VIH HIGH-state input voltage VCC = 2.0 V 1.5 - - V
VCC = 4.5 V 3.15 - - V
VCC = 6.0 V 4.2 - - V
VIL LOW-state input voltage VCC = 2.0 V - - 0.5 V
VCC = 4.5 V - - 1.35 V
VCC = 6.0 V - - 1.8 V
VOH HIGH-state output voltage VI = VIH or VIL
IO=−20 µA; VCC = 2.0 V 1.9 - - V
IO=−20 µA; VCC = 4.5 V 4.4 - - V
IO=−20 µA; VCC = 6.0 V 5.9 - - V
IO=−4.0 mA; VCC = 4.5 V 3.7 - - V
IO=−5.2 mA; VCC = 6 V 5.2 - - V
VOL LOW-state output voltage VI = VIH or VIL
IO=20µA; VCC = 2.0 V - - 0.1 V
IO=20µA; VCC = 4.5 V - - 0.1 V
IO=20µA; VCC = 6.0 V - - 0.1 V
IO= 4.0 mA; VCC = 4.5 V - - 0.4 V
IO= 5.2 mA; VCC = 6 V - - 0.4 V
ILI input leakage current VI=V
CC or GND; VCC = 6 V - - ±1.0 µA
IOZ OFF-state output current VI = VIH or VIL; VO=V
CC or GND;
VCC = 6.0 V ±10.0 µA
ICC quiescent supply current VCC = 6.0 V; IO = 0 A;
VI=V
CC or GND - - 160 µA
Table 7: Static characteristics 74HC138
…continued
At recommended operating conditions; voltages are referenced to GND (ground = 0 V).
Symbol Parameter Conditions Min Typ Max Unit
74HC_HCT138_3 © Koninklijke Philips Electronics N.V. 2005. All rights reserved.
Product data sheet Rev. 03 — 23 December 2005 9 of 23
Philips Semiconductors 74HC138; 74HCT138
3-to-8 line decoder/demultiplexer; inverting
Table 8: Static characteristics 74HCT138
At recommended operating conditions; voltages are referenced to GND (ground = 0 V).
Symbol Parameter Conditions Min Typ Max Unit
Tamb =25°C
VIH HIGH-state input voltage VCC = 4.5 V to 5.5 V 2.0 1.6 - V
VIL LOW-state input voltage VCC = 4.5 V to 5.5 V - 1.2 0.8 V
VOH HIGH-state output voltage VI = VIH or VIL
IO=−20 µA; VCC = 4.5 V 4.4 4.5 - V
IO=−4.0 mA; VCC = 4.5 V 3.98 4.32 - V
VOL LOW-state output voltage VI = VIH or VIL
IO=20µA; VCC = 4.5 V - 0.0 0.1 V
IO= 4.0 mA; VCC = 4.5 V - 0.15 0.26 V
ILI input leakage current VI=V
CC or GND; VCC = 5.5 V - - ±0.1 µA
IOZ OFF-state output current VI = VIH or VIL; VCC = 5.5 V;
VO=V
CC or GND; IO= 0 A --±0.5 µA
ICC quiescent supply current VCC = 6.0 V; IO = 0 A;
VI=V
CC or GND - - 8.0 µA
∆ICC additional quiescent supply
current per input pin; VI=V
CC −2.1 V; other
inputs at VCC or GND;
VCC = 4.5 V to 5.5 V; IO=0A
pin An - 150 540 µA
pin En - 125 450 µA
pin E3 - 100 360 µA
Ciinput capacitance - 3.5 - pF
Tamb =−40 °C to +85 °C
VIH HIGH-state input voltage VCC = 4.5 to 5.5 V 2.0 - - V
VIL LOW-state input voltage VCC = 4.5 to 5.5 V - - 0.8 V
VOH HIGH-state output voltage VI = VIH or VIL
IO=−20 µA; VCC = 4.5 V 4.4 - - V
IO = −4.0 mA; VCC = 4.5 V 3.84 - - V
VOL LOW-state output voltage VI = VIH or VIL
IO=20µA; VCC = 4.5 V - - 0.1 V
IO = 4.0 mA; VCC = 4.5 V - - 0.33 V
ILI input leakage current VI=V
CC or GND; VCC = 5.5 V - - ±1.0 µA
IOZ OFF-state output current VI = VIH or VIL; VCC = 5.5 V;
VO=V
CC or GND; IO= 0 A --±5.0 µA
ICC quiescent supply current VCC = 5.5 V; IO = 0 A;
VI=V
CC or GND --80µA
∆ICC additional quiescent supply
current per input pin; VI=V
CC −2.1 V; other
inputs at VCC or GND;
VCC = 4.5 V to 5.5 V; IO=0A
pin An - - 675 µA
pin En - - 562.5 µA
pin E3 - - 450 µA
74HC_HCT138_3 © Koninklijke Philips Electronics N.V. 2005. All rights reserved.
Product data sheet Rev. 03 — 23 December 2005 10 of 23
Philips Semiconductors 74HC138; 74HCT138
3-to-8 line decoder/demultiplexer; inverting
Tamb =−40 °C to +125 °C
VIH HIGH-state input voltage VCC = 4.5 V to 5.5 V 2.0 - - V
VIL LOW-state input voltage VCC = 4.5 V to 5.5 V - - 0.8 V
VOH HIGH-state output voltage VI = VIH or VIL
IO=−20 µA; VCC = 4.5 V 4.4 - - V
IO = −4.0 mA; VCC = 4.5 V 3.7 - - V
VOL LOW-state output voltage VI = VIH or VIL
IO=20µA; VCC = 4.5 V - - 0.1 V
IO = 4.0 mA; VCC = 4.5 V - - 0.4 V
ILI input leakage current VI=V
CC or GND; VCC = 5.5 V - - 1.0 µA
IOZ OFF-state output current VI = VIH or VIL; VCC = 5.5 V;
VO=V
CC or GND; IO= 0 A --±10.0 µA
ICC quiescent supply current VCC = 5.5 V; IO = 0 A;
VI=V
CC or GND - - 160 µA
∆ICC additional quiescent supply
current per input pin; VI=V
CC −2.1 V; other
inputs at VCC or GND;
VCC = 4.5 V to 5.5 V; IO=0A
pin An - - 735 µA
pin En - - 612.5 µA
pin E3 - - 490 µA
Table 8: Static characteristics 74HCT138
…continued
At recommended operating conditions; voltages are referenced to GND (ground = 0 V).
Symbol Parameter Conditions Min Typ Max Unit
74HC_HCT138_3 © Koninklijke Philips Electronics N.V. 2005. All rights reserved.
Product data sheet Rev. 03 — 23 December 2005 11 of 23
Philips Semiconductors 74HC138; 74HCT138
3-to-8 line decoder/demultiplexer; inverting
11. Dynamic characteristics
Table 9: Dynamic characteristics 74HC138
Voltages are referenced to GND (ground = 0 V); C
L
= 50 pF unless otherwise specified.
For test circuit see Figure 8.
Symbol Parameter Conditions Min Typ Max Unit
Tamb =25°C
tPHL,
tPLH
propagation delay
An to Yn see Figure 6
VCC = 2.0 V - 41 150 ns
VCC = 4.5 V - 15 30 ns
VCC =5V;C
L= 15 pF - 12 - ns
VCC = 6.0 V - 12 26 ns
E3 to Yn see Figure 6
VCC = 2.0 V - 47 150 ns
VCC = 4.5 V - 17 30 ns
VCC =5V;C
L= 15 pF - 14 - ns
VCC = 6.0 V - 14 26 ns
En to Yn see Figure 7
VCC = 2.0 V - 47 150 ns
VCC = 4.5 V - 17 30 ns
VCC =5V;C
L= 15 pF - 14 - ns
VCC = 6.0 V - 14 26 ns
tTHL,
tTLH
output transition
time see Figure 6 and 7
VCC = 2.0 V - 19 75 ns
VCC = 4.5 V - 7 15 ns
VCC = 6.0 V - 6 13 ns
CPD power dissipation
capacitance VI= GND to VCC [1] -67-pF
Tamb =−40 °C to +85 °C
tPHL,
tPLH
propagation delay
An to Yn see Figure 6
VCC = 2.0 V - - 190 ns
VCC = 4.5 V - - 38 ns
VCC = 6.0 V - - 33 ns
E3 to Yn see Figure 6
VCC = 2.0 V - - 190 ns
VCC = 4.5 V - - 38 ns
VCC = 6.0 V - - 33 ns
En to Yn see Figure 7
VCC = 2.0 V - - 190 ns
VCC = 4.5 V - - 38 ns
VCC = 6.0 V - - 33 ns
74HC_HCT138_3 © Koninklijke Philips Electronics N.V. 2005. All rights reserved.
Product data sheet Rev. 03 — 23 December 2005 12 of 23
Philips Semiconductors 74HC138; 74HCT138
3-to-8 line decoder/demultiplexer; inverting
[1] CPD is used to determine the dynamic power dissipation (PD in µW).
PD=C
PD ×VCC2×fi×N+Σ(CL×VCC2×fo) where:
fi= input frequency in MHz;
fo= output frequency in MHz;
CL= output load capacitance in pF;
VCC = supply voltage in V;
N = number of inputs switching;
Σ(CL×VCC2×fo) = sum of the outputs.
tTHL,
tTLH
output transition
time see Figure 6 and 7
VCC = 2.0 V - - 95 ns
VCC = 4.5 V - - 19 ns
VCC = 6.0 V - - 16 ns
Tamb =−40 °C to +125 °C
tPHL,
tPLH
propagation delay
An to Yn see Figure 6
VCC = 2.0 V - - 225 ns
VCC = 4.5 V - - 45 ns
VCC = 6.0 V - - 38 ns
E3 to Yn see Figure 6
VCC = 2.0 V - - 225 ns
VCC = 4.5 V - - 45 ns
VCC = 6.0 V - - 38 ns
En to Yn see Figure 7
VCC = 2.0 V - - 225 ns
VCC = 4.5 V - - 45 ns
VCC = 6.0 V - - 38 ns
tTHL,
tTLH
output transition
time see Figure 6 and 7
VCC = 2.0 V - - 110 ns
VCC = 4.5 V - - 22 ns
VCC = 6.0 V - - 19 ns
Table 9: Dynamic characteristics 74HC138
…continued
Voltages are referenced to GND (ground = 0 V); C
L
= 50 pF unless otherwise specified.
For test circuit see Figure 8.
Symbol Parameter Conditions Min Typ Max Unit
74HC_HCT138_3 © Koninklijke Philips Electronics N.V. 2005. All rights reserved.
Product data sheet Rev. 03 — 23 December 2005 13 of 23
Philips Semiconductors 74HC138; 74HCT138
3-to-8 line decoder/demultiplexer; inverting
[1] CPD is used to determine the dynamic power dissipation (PD in µW).
PD=C
PD ×VCC2×fi×N+Σ(CL×VCC2×fo) where:
fi= input frequency in MHz;
fo= output frequency in MHz;
CL= output load capacitance in pF;
Table 10: Dynamic characteristics 74HCT138
Voltages are referenced to GND (ground = 0 V); C
L
= 50 pF unless otherwise specified.
For test circuit see Figure 8.
Symbol Parameter Conditions Min Typ Max Unit
Tamb =25°C
tPHL,
tPLH
propagation delay
An to Yn see Figure 6
VCC = 4.5 V - 20 35 ns
VCC = 5 V; CL=15pF - 17 - ns
E3 to Yn see Figure 6
VCC = 4.5 V - 18 40 ns
VCC = 5 V; CL=15pF - 19 - ns
En to Yn see Figure 7
VCC = 4.5 V - 19 40 ns
VCC = 5 V; CL=15pF - 19 - ns
tTHL,
tTLH
output transition time see Figure 6 and 7
VCC = 4.5 V - 7 15 ns
CPD power dissipation
capacitance VI= GND to (VCC −1.5 V) [1] -67-pF
Tamb =−40 °C to +85 °C
tPHL,
tPLH
propagation delay
An to Yn see Figure 6
VCC = 4.5 V - - 44 ns
E3 to Yn see Figure 6
VCC = 4.5 V - - 50 ns
En to Yn see Figure 7
VCC = 4.5 V - - 50 ns
tTHL,
tTLH
output transition time see Figure 6 and 7
VCC = 4.5 V - - 19 ns
Tamb =−40 °C to +125 °C
tPHL,
tPLH
propagation delay
An to Yn see Figure 6
VCC = 4.5 V - - 53 ns
E3 to Yn see Figure 6
VCC = 4.5 V - - 60 ns
En to Yn see Figure 7
VCC = 4.5 V - - 60 ns
tTHL,
tTLH
output transition time see Figure 6 and 7
VCC = 4.5 V - - 22 ns
74HC_HCT138_3 © Koninklijke Philips Electronics N.V. 2005. All rights reserved.
Product data sheet Rev. 03 — 23 December 2005 14 of 23
Philips Semiconductors 74HC138; 74HCT138
3-to-8 line decoder/demultiplexer; inverting
VCC = supply voltage in V;
N = number of inputs switching;
Σ(CL×VCC2×fo) = sum of the outputs.
12. Waveforms
Measurement points are given in Table 11.
VOL and VOH are typical voltage output drop that occur with the output load.
Fig 6. Propagation delay input (An) and enable input (E3) to output (Yn) and transition
time output (Yn)
Measurement points are given in Table 11.
VOL and VOH are typical voltage output drop that occur with the output load.
Fig 7. Propagation delay enable input (En) to output (Yn) and transition time output (Yn)
Table 11: Measurement points
Type Input Output
VMVM
74HC138 0.5VCC 0.5VCC
74HCT138 1.3 V 1.3 V
mna373
An, E3
input
Yn
output
tPHL
tTHL
tPLH
GND
VCC
VM
VM
VOH
VOL tTLH
mna374
E1, E2
input
Yn
output
tPHL tPLH
GND
VCC
VM
VM
VOH
VOL tTHL tTLH
74HC_HCT138_3 © Koninklijke Philips Electronics N.V. 2005. All rights reserved.
Product data sheet Rev. 03 — 23 December 2005 15 of 23
Philips Semiconductors 74HC138; 74HCT138
3-to-8 line decoder/demultiplexer; inverting
Test data is given in Table 12.
Definitions test circuit:
RT = Termination resistance should be equal to output impedance Zo of the pulse generator
CL = Load capacitance including jig and probe capacitance
RL = Load resistor
S1 = Test selection switch
Fig 8. Load circuitry for measuring switching times
Table 12: Test data
Type Input Load S1 position
VItr, tfCLRLtPHL, tPLH tPZH, tPHZ tPZL, tPLZ
74HC138 VCC 6 ns 15 pF, 50 pF 1 kΩopen GND VCC
74HCT138 3 V 6 ns 15 pF, 50 pF 1 kΩopen GND VCC
VMVM
tW
tW
10 %
90 %
0 V
VI
VI
negative
pulse
positive
pulse
0 V
VMVM
90 %
10 %
tf
tr
tr
tf
001aad983
DUT
VCC VCC
VIVO
RT
RLS1
CL
open
PULSE
GENERATOR
74HC_HCT138_3 © Koninklijke Philips Electronics N.V. 2005. All rights reserved.
Product data sheet Rev. 03 — 23 December 2005 16 of 23
Philips Semiconductors 74HC138; 74HCT138
3-to-8 line decoder/demultiplexer; inverting
13. Package outline
Fig 9. Package outline SOT38-1 (DIP16)
UNIT A
max. 1 2 b1cEe M
H
L
REFERENCES
OUTLINE
VERSION EUROPEAN
PROJECTION ISSUE DATE
IEC JEDEC JEITA
mm
inches
DIMENSIONS (inch dimensions are derived from the original mm dimensions)
SOT38-1 99-12-27
03-02-13
A
min. A
max. bmax.
w
ME
e1
1.40
1.14
0.055
0.045
0.53
0.38 0.32
0.23 21.8
21.4
0.86
0.84
6.48
6.20
0.26
0.24
3.9
3.4
0.15
0.13
0.2542.54 7.62
0.3
8.25
7.80
0.32
0.31
9.5
8.3
0.37
0.33
2.2
0.087
4.7 0.51 3.7
0.15 0.021
0.015 0.013
0.009 0.010.10.020.19
050G09 MO-001 SC-503-16
MH
c
(e )
1
ME
A
L
seating plane
A1
wM
b1
e
D
A2
Z
16
1
9
8
b
E
pin 1 index
0 5 10 mm
scale
Note
1. Plastic or metal protrusions of 0.25 mm (0.01 inch) maximum per side are not included.
(1) (1)
D(1)
Z
DIP16: plastic dual in-line package; 16 leads (300 mil); long body SOT38-1
74HC_HCT138_3 © Koninklijke Philips Electronics N.V. 2005. All rights reserved.
Product data sheet Rev. 03 — 23 December 2005 17 of 23
Philips Semiconductors 74HC138; 74HCT138
3-to-8 line decoder/demultiplexer; inverting
Fig 10. Package outline SOT109-1 (SO16)
X
wM
θ
A
A1
A2
bp
D
HE
Lp
Q
detail X
E
Z
e
c
L
vMA
(A )
3
A
8
9
1
16
y
pin 1 index
UNIT A
max. A1A2A3bpcD
(1) E(1) (1)
eH
ELL
pQZywv θ
REFERENCES
OUTLINE
VERSION EUROPEAN
PROJECTION ISSUE DATE
IEC JEDEC JEITA
mm
inches
1.75 0.25
0.10 1.45
1.25 0.25 0.49
0.36 0.25
0.19 10.0
9.8 4.0
3.8 1.27 6.2
5.8 0.7
0.6 0.7
0.3 8
0
o
o
0.25 0.1
DIMENSIONS (inch dimensions are derived from the original mm dimensions)
Note
1. Plastic or metal protrusions of 0.15 mm (0.006 inch) maximum per side are not included.
1.0
0.4
SOT109-1 99-12-27
03-02-19
076E07 MS-012
0.069 0.010
0.004 0.057
0.049 0.01 0.019
0.014 0.0100
0.0075 0.39
0.38 0.16
0.15 0.05
1.05
0.041
0.244
0.228 0.028
0.020 0.028
0.012
0.01
0.25
0.01 0.004
0.039
0.016
0 2.5 5 mm
scale
SO16: plastic small outline package; 16 leads; body width 3.9 mm SOT109-1
74HC_HCT138_3 © Koninklijke Philips Electronics N.V. 2005. All rights reserved.
Product data sheet Rev. 03 — 23 December 2005 18 of 23
Philips Semiconductors 74HC138; 74HCT138
3-to-8 line decoder/demultiplexer; inverting
Fig 11. Package outline SOT403-1 (TSSOP16)
UNIT A1A2A3bpcD
(1) E(2) (1)
eH
ELL
pQZywv θ
REFERENCES
OUTLINE
VERSION EUROPEAN
PROJECTION ISSUE DATE
IEC JEDEC JEITA
mm 0.15
0.05 0.95
0.80 0.30
0.19 0.2
0.1 5.1
4.9 4.5
4.3 0.65 6.6
6.2 0.4
0.3 0.40
0.06 8
0
o
o
0.13 0.10.21
DIMENSIONS (mm are the original dimensions)
Notes
1. Plastic or metal protrusions of 0.15 mm maximum per side are not included.
2. Plastic interlead protrusions of 0.25 mm maximum per side are not included.
0.75
0.50
SOT403-1 MO-153 99-12-27
03-02-18
wM
bp
D
Z
e
0.25
18
16 9
θ
A
A1
A2
Lp
Q
detail X
L
(A )
3
HE
E
c
vMA
X
A
y
0 2.5 5 mm
scale
TSSOP16: plastic thin shrink small outline package; 16 leads; body width 4.4 mm SOT403-1
A
max.
1.1
pin 1 index
74HC_HCT138_3 © Koninklijke Philips Electronics N.V. 2005. All rights reserved.
Product data sheet Rev. 03 — 23 December 2005 19 of 23
Philips Semiconductors 74HC138; 74HCT138
3-to-8 line decoder/demultiplexer; inverting
Fig 12. Package outline SOT338-1 (SSOP16)
UNIT A1A2A3bpcD
(1) E(1) eH
ELL
pQZywv θ
REFERENCES
OUTLINE
VERSION EUROPEAN
PROJECTION ISSUE DATE
IEC JEDEC JEITA
mm 0.21
0.05 1.80
1.65 0.25 0.38
0.25 0.20
0.09 6.4
6.0 5.4
5.2 0.65 1.25
7.9
7.6 1.03
0.63 0.9
0.7 1.00
0.55 8
0
o
o
0.130.2 0.1
DIMENSIONS (mm are the original dimensions)
Note
1. Plastic or metal protrusions of 0.25 mm maximum per side are not included.
SOT338-1 99-12-27
03-02-19
(1)
wM
bp
D
HE
E
Z
e
c
vMA
X
A
y
18
16 9
θ
A
A1
A2
Lp
Q
detail X
L
(A )
3
MO-150
pin 1 index
0 2.5 5 mm
scale
SSOP16: plastic shrink small outline package; 16 leads; body width 5.3 mm SOT338-1
A
max.
2
74HC_HCT138_3 © Koninklijke Philips Electronics N.V. 2005. All rights reserved.
Product data sheet Rev. 03 — 23 December 2005 20 of 23
Philips Semiconductors 74HC138; 74HCT138
3-to-8 line decoder/demultiplexer; inverting
Fig 13. Package outline SOT763-1 (DHVQFN16)
terminal 1
index area
0.51
A1Eh
b
UNIT ye
0.2
c
REFERENCES
OUTLINE
VERSION EUROPEAN
PROJECTION ISSUE DATE
IEC JEDEC JEITA
mm 3.6
3.4
Dh
2.15
1.85
y1
2.6
2.4 1.15
0.85
e1
2.5
0.30
0.18
0.05
0.00 0.05 0.1
DIMENSIONS (mm are the original dimensions)
SOT763-1 MO-241 - - -- - -
0.5
0.3
L
0.1
v
0.05
w
0 2.5 5 mm
scale
SOT763-1
DHVQFN16: plastic dual in-line compatible thermal enhanced very thin quad flat package; no leads;
16 terminals; body 2.5 x 3.5 x 0.85 mm
A(1)
max.
AA1c
detail X
y
y1C
e
L
Eh
Dh
e
e1
b
27
15 10
9
8
1
16
X
D
E
C
BA
terminal 1
index area
AC
CB
vM
wM
E(1)
Note
1. Plastic or metal protrusions of 0.075 mm maximum per side are not included.
D(1)
02-10-17
03-01-27
74HC_HCT138_3 © Koninklijke Philips Electronics N.V. 2005. All rights reserved.
Product data sheet Rev. 03 — 23 December 2005 21 of 23
Philips Semiconductors 74HC138; 74HCT138
3-to-8 line decoder/demultiplexer; inverting
14. Abbreviations
15. Revision history
Table 13: Abbreviations
Acronym Description
CMOS Complementary Metal Oxide Semiconductor
DUT Device Under Test
ESD ElectroStatic Discharge
HBM Human Body Model
LSTTL Low-power Schottky Transistor-Transistor Logic
MM Machine Model
Table 14: Revision history
Document ID Release date Data sheet status Change notice Doc. number Supersedes
74HC_HCT138_3 20051223 Product data sheet - - 74HC_HCT138_CNV_2
Modifications: •The format of this data sheet has been redesigned to comply with the new presentation and
information standard of Philips Semiconductors.
•Section 4 “Ordering information”,Section 6 “Pinning information” and Section 13 “Package
outline”: Added DHVQFN package information
•Section 10 “Static characteristics”: Added from the family specification
74HC_HCT138_CNV_2 19970827 Product
specification ---
Philips Semiconductors 74HC138; 74HCT138
3-to-8 line decoder/demultiplexer; inverting
74HC_HCT138_3 © Koninklijke Philips Electronics N.V. 2005. All rights reserved.
Product data sheet Rev. 03 — 23 December 2005 22 of 23
16. Data sheet status
[1] Please consult the most recently issued data sheet before initiating or completing a design.
[2] The product status of the device(s) described in this data sheet may have changed since this data sheet was published. The latest information is available on the Internet at
URL http://www.semiconductors.philips.com.
[3] For data sheets describing multiple type numbers, the highest-level product status determines the data sheet status.
17. Definitions
Short-form specification — The data in a short-form specification is
extracted from a full data sheet with the same type number and title. For
detailed information see the relevant data sheet or data handbook.
Limiting values definition — Limiting values given are in accordance with
the Absolute Maximum Rating System (IEC 60134). Stress above one or
more of the limiting values may cause permanent damage to the device.
These are stress ratings only and operation of the device at these or at any
other conditions above those given in the Characteristics sections of the
specification is not implied. Exposure to limiting values for extended periods
may affect device reliability.
Application information — Applications that are described herein for any
of these products are for illustrative purposes only. Philips Semiconductors
makes no representation or warranty that such applications will be suitable for
the specified use without further testing or modification.
18. Disclaimers
Life support — These products are not designed for use in life support
appliances, devices, or systems where malfunction of these products can
reasonably be expected to result in personal injury. Philips Semiconductors
customers using or selling these products for use in such applications do so
at their own risk and agree to fully indemnify Philips Semiconductors for any
damages resulting from such application.
Right to make changes — Philips Semiconductors reserves the right to
make changes in the products - including circuits, standard cells, and/or
software - described or contained herein in order to improve design and/or
performance. When the product is in full production (status ‘Production’),
relevant changes will be communicated via a Customer Product/Process
Change Notification (CPCN). Philips Semiconductors assumes no
responsibility or liability for the use of any of these products, conveys no
license or title under any patent, copyright, or mask work right to these
products, and makes no representations or warranties that these products are
free from patent, copyright, or mask work right infringement, unless otherwise
specified.
19. Trademarks
Notice — All referenced brands, product names, service names and
trademarks are the property of their respective owners.
20. Contact information
For additional information, please visit: http://www.semiconductors.philips.com
For sales office addresses, send an email to: sales.addresses@www.semiconductors.philips.com
Level Data sheet status[1] Product status[2] [3] Definition
I Objective data Development This data sheet contains data from the objective specification for product development. Philips
Semiconductors reserves the right to change the specification in any manner without notice.
II Preliminary data Qualification This data sheet contains data from the preliminary specification. Supplementary data will be published
at a later date. Philips Semiconductors reserves the right to change the specification without notice, in
order to improve the design and supply the best possible product.
III Product data Production This data sheet contains data from the product specification. Philips Semiconductors reserves the
right to make changes at any time in order to improve the design, manufacturing and supply. Relevant
changes will be communicated via a Customer Product/Process Change Notification (CPCN).
© Koninklijke Philips Electronics N.V. 2005
All rights are reserved. Reproduction in whole or in part is prohibited without the prior
written consent of the copyright owner. The information presented in this document does
not form part of any quotation or contract, is believed to be accurate and reliable and may
be changed without notice. No liability will be accepted by the publisher for any
consequence of its use. Publication thereof does not convey nor imply any license under
patent- or other industrial or intellectual property rights.
Date of release: 23 December 2005
Document number: 74HC_HCT138_3
Published in The Netherlands
Philips Semiconductors 74HC138; 74HCT138
3-to-8 line decoder/demultiplexer; inverting
21. Contents
1 General description. . . . . . . . . . . . . . . . . . . . . . 1
2 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
3 Quick reference data . . . . . . . . . . . . . . . . . . . . . 2
4 Ordering information. . . . . . . . . . . . . . . . . . . . . 2
5 Functional diagram . . . . . . . . . . . . . . . . . . . . . . 3
6 Pinning information. . . . . . . . . . . . . . . . . . . . . . 4
6.1 Pinning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
6.2 Pin description . . . . . . . . . . . . . . . . . . . . . . . . . 5
7 Functional description . . . . . . . . . . . . . . . . . . . 5
8 Limiting values. . . . . . . . . . . . . . . . . . . . . . . . . . 6
9 Recommended operating conditions. . . . . . . . 6
10 Static characteristics. . . . . . . . . . . . . . . . . . . . . 7
11 Dynamic characteristics . . . . . . . . . . . . . . . . . 11
12 Waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
13 Package outline . . . . . . . . . . . . . . . . . . . . . . . . 16
14 Abbreviations. . . . . . . . . . . . . . . . . . . . . . . . . . 21
15 Revision history. . . . . . . . . . . . . . . . . . . . . . . . 21
16 Data sheet status. . . . . . . . . . . . . . . . . . . . . . . 22
17 Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
18 Disclaimers. . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
19 Trademarks. . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
20 Contact information . . . . . . . . . . . . . . . . . . . . 22
