SN54LVC646A, SN74LVC646A
OCTAL BUS TRANSCEIVERS AND REGISTERS
WITH 3-STATE OUTPUTS
SCAS302G – JANUARY 1993 – REVISED JUNE1998
1
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
D
EPIC
(Enhanced-Performance Implanted
CMOS) Submicron Process
D
Typical VOLP (Output Ground Bounce)
< 0.8 V at VCC = 3.3 V, TA = 25°C
D
Typical VOHV (Output VOH Undershoot)
> 2 V at VCC = 3.3 V, TA = 25°C
D
Power Off Disables Outputs, Permitting
Live Insertion
D
Support Mixed-Mode Signal Operation on
All Ports (5-V Input/Output Voltage With
3.3-V VCC)
D
ESD Protection Exceeds 2000 V Per
MIL-STD-833, Method 3015; Exceeds 200 V
Using Machine Model (C = 200 pF, R = 0)
D
Latch-Up Performance Exceeds 250 mA Per
JESD 17
D
Package Options Include Plastic
Small-Outline (DW), Shrink Small-Outline
(DB), Thin Shrink Small-Outline (PW)
Packages, and Ceramic Chip Carriers (FK)
description
The SN54LVC646A octal bus transceiver and
register is designed for 2.7-V to 3.6-V VCC
operation and the SN74LVC646A octal bus
transceiver and register is designed for 1.65-V to
3.6-V VCC operation.
These devices consist of bus-transceiver circuits,
D-type flip-flops, and control circuitry arranged for
multiplexed transmission of data directly from the
input bus or from the internal registers. Data on
the A or B bus is clocked into the registers on the
low-to-high transition of the appropriate clock
(CLKAB or CLKBA) input. Figure 1 illustrates the
four fundamental bus-management functions that
are performed with the ’LVC646A.
Output-enable (OE) and direction-control (DIR) inputs control the transceiver functions. In the transceiver
mode, data present at the high-impedance port is stored in either register or in both.
The select-control (SAB and SBA) inputs can multiplex stored and real-time (transparent mode) data. DIR
determines which bus receives data when OE is low. In the isolation mode (OE high), A data is stored in one
register and B data can be stored in the other register.
When an output function is disabled, the input function is still enabled and can be used to store and transmit
data. Only one of the two buses, A or B, can be driven at a time.
Copyright 1998, Texas Instruments Incorporated
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
EPIC is a trademark of Texas Instruments Incorporated.
SN74LVC646A . . . DB, DW, OR PW PACKAGE
(TOP VIEW)
CLKAB
SAB
DIR
A1
A2
A3
A4
A5
A6
A7
A8
GND
VCC
CLKBA
SBA
OE
B1
B2
B3
B4
B5
B6
B7
B8
1
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13
5
6
7
8
9
10
11
25
24
23
22
21
20
19
432128
12 13 14 15 16
OE
B1
B2
NC
B3
B4
B5
A1
A2
A3
NC
A4
A5
A6
SN54LVC646A . . . FK PACKAGE
(TOP VIEW)
DIR
SAB
CLKAB
B8
B7
A8
GND
NC NC
CLKBA
SBA
V
A7
B6
17 18
27 26
CC
NC – No internal connection
On products compliant to MIL-PRF-38535, all parameters are tested
unless otherwise noted. On all other products, production
processing does not necessarily include testing of all parameters.
SN54LVC646A, SN74LVC646A
OCTAL BUS TRANSCEIVERS AND REGISTERS
WITH 3-STATE OUTPUTS
SCAS302G – JANUARY 1993 – REVISED JUNE1998
2POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
description (continued)
Inputs can be driven from either 3.3-V or 5-V devices. This feature allows the use of these devices as translators
in a mixed 3.3-V/5-V system environment.
T o ensure the high-impedance state during power up or power down, OE should be tied to VCC through a pullup
resistor; the minimum value of the resistor is determined by the current-sinking capability of the driver.
The SN54LVC646A is characterized for operation over the full military temperature range of –55°C to 125°C.
The SN74LVC646A is characterized for operation from –40°C to 85°C.
FUNCTION TABLE
INPUTS DATA I/O
OPERATION OR FUNCTION
OE DIR CLKAB CLKBA SAB SBA A1–A8 B1–B8
OPERATION
OR
FUNCTION
X X ↑X X X Input Unspecified†Store A, B unspecified†
XXX ↑X X Unspecified†Input Store B, A unspecified†
H X ↑ ↑ X X Input Input Store A and B data
HX H or L H or L X X Input disabled Input disabled Isolation, hold storage
L L X X X L Output Input Real-time B data to A bus
LL X H or L X H Output Input Stored B data to A bus
L H X X L X Input Output Real-time A data to B bus
L H H or L X H X Input Output Stored A data to B bus
†The data-output functions can be enabled or disabled by various signals at OE and DIR. Data-input functions always are enabled; i.e., data at
the bus terminals is stored on every low-to-high transition of the clock inputs.
SN54LVC646A, SN74LVC646A
OCTAL BUS TRANSCEIVERS AND REGISTERS
WITH 3-STATE OUTPUTS
SCAS302G – JANUARY 1993 – REVISED JUNE1998
3
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
21
L
3
DIR
L
1
CLKAB
X
23
CLKBA
X
2
SAB
X
22
SBA
L
21
L
3
DIR
H
1
CLKAB
X
23
CLKBA
X
2
SAB
L
22
SBA
X
21
X
3
DIR
X
1
CLKAB 23
CLKBA
X
2
SAB
X
22
SBA
X
21
L
3
DIR
L
1
CLKAB
X
23
CLKBA
H or L
2
SAB
X
22
SBA
H
X
HX
XXX
X
X
XL H H or L X H X
↑↑
↑↑
BUS B
BUS A
BUS B
BUS A
BUS B
BUS A
BUS B
BUS A
OE OE
OEOE
REAL-TIME TRANSFER
BUS B TO BUS A REAL-TIME TRANSFER
BUS A TO BUS B
STORAGE FROM
A, B, OR A AND B
TRANSFER STORED DATA
TO A AND/OR B
Figure 1. Bus-Management Functions
SN54LVC646A, SN74LVC646A
OCTAL BUS TRANSCEIVERS AND REGISTERS
WITH 3-STATE OUTPUTS
SCAS302G – JANUARY 1993 – REVISED JUNE1998
4POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
logic symbol†
†This symbol is in accordance with ANSI/IEEE Std 91-1984 and IEC Publication 617-12.
Pin numbers shown are for the DB, DW, and PW packages.
A1 4B1
20
4D
5
7
7
5
1
1
6D ≥1
≥1
1
2
A2 5B2
19
A3 6B3
18
A4 7B4
17
A5 8B5
16
A6 9B6
15
A7 10 B7
14
A8 11 B8
13
OE G3
21
3 EN2 [AB]
G5
22
SBA
3 EN1 [BA]
3
DIR
23
CLKBA
1
CLKAB
G7
2
SAB
C6
C4
SN54LVC646A, SN74LVC646A
OCTAL BUS TRANSCEIVERS AND REGISTERS
WITH 3-STATE OUTPUTS
SCAS302G – JANUARY 1993 – REVISED JUNE1998
5
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
logic diagram (positive logic)
A1 B1
One of Eight Channels
SAB
CLKAB
SBA
CLKBA
DIR
OE
To Seven Other Channels
21
3
23
22
1
2
420
1D
C1
1D
C1
Pin numbers shown are for the DB, DW, and PW packages.
SN54LVC646A, SN74LVC646A
OCTAL BUS TRANSCEIVERS AND REGISTERS
WITH 3-STATE OUTPUTS
SCAS302G – JANUARY 1993 – REVISED JUNE1998
6POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)†
Supply voltage range, VCC –0.5 V to 6.5 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input voltage range, VI: (see Note 1) –0.5 V to 6.5 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Voltage range applied to any output in the high-impedance or power-off state, VO
(see Note 1) –0.5 V to 6.5 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Voltage range applied to any output in the high or low state, VO
(see Notes 1 and 2) –0.5 V to VCC + 0.5 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input clamp current, IIK (VI < 0) –50 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Output clamp current, IOK (VO < 0) –50 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Continuous output current, IO ±50 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Continuous current through VCC or GND ±100 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Package thermal impedance, θJA (see Note 3): DB package 104°C/W. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DW package 81°C/W. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
PW package 120°C/W. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Storage temperature range, Tstg –65°C to 150°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
†Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only , and
functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not
implied. Exposure to absolute-maximum-rated conditions for extended periods may af fect device reliability.
NOTES: 1. The input negative-voltage and output voltage ratings may be exceeded if the input and output current ratings are observed.
2. The value of VCC is provided in the recommended operating conditions table.
3. The package thermal impedance is calculated in accordance with JESD 51.
recommended operating conditions (see Note 4)
SN54LVC646A SN74LVC646A
UNIT
MIN MAX MIN MAX
UNIT
VCC
Su
pp
ly voltage
Operating 2 3.6 1.65 3.6
V
V
CC
S
u
ppl
y v
oltage
Data retention only 1.5 1.5
V
VCC = 1.65 V to 1.95 V 0.65×VCC
VIH High-level input voltage VCC = 2.3 V to 2.7 V 1.7 V
VCC = 2.7 V to 3.6 V 2 2
VCC = 1.65 V to 1.95 V 0.35×VCC
VIL Low-level input voltage VCC = 2.3 V to 2.7 V 0.7 V
VCC = 2.7 V to 3.6 V 0.8 0.8
VIInput voltage 0 5.5 0 5.5 V
VO
Out
p
ut voltage
High or low state 0 VCC 0 VCC
V
V
O
O
u
tp
u
t
v
oltage
3 state 0 5.5 0 5.5
V
VCC = 1.65 V –4
IOH
High level out
p
ut current
VCC = 2.3 V –8
mA
I
OH
High
-
le
v
el
o
u
tp
u
t
c
u
rrent
VCC = 2.7 V –12 –12
mA
VCC = 3 V –24 –24
VCC = 1.65 V 4
IOL
Low level out
p
ut current
VCC = 2.3 V 8
mA
I
OL
Lo
w-
le
v
el
o
u
tp
u
t
c
u
rrent
VCC = 2.7 V 12 12
mA
VCC = 3 V 24 24
∆t/∆vInput transition rise or fall rate 0 10 0 10 ns/V
TAOperating free-air temperature –55 125 –40 85 °C
NOTE 4: All unused inputs of the device must be held at VCC or GND to ensure proper device operation. Refer to the TI application report,
Implications of Slow or Floating CMOS Inputs
, literature number SCBA004.
SN54LVC646A, SN74LVC646A
OCTAL BUS TRANSCEIVERS AND REGISTERS
WITH 3-STATE OUTPUTS
SCAS302G – JANUARY 1993 – REVISED JUNE1998
7
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
PARAMETER
TEST CONDITIONS
V
SN54LVC646A SN74LVC646A
UNIT
PARAMETER
TEST
CONDITIONS
V
CC MIN TYP†MAX MIN TYP†MAX
UNIT
IOH = 100 µA
1.65 V to 3.6 V VCC–0.2
I
OH = –
100
µ
A
2.7 V to 3.6 V VCC–0.2
IOH = –4 mA 1.65 V 1.2
VOH IOH = –8 mA 2.3 V 1.7 V
IOH =12mA
2.7 V 2.2 2.2
I
OH = –
12
mA
3 V 2.4 2.4
IOH = –24 mA 3 V 2.2 2.2
IOL = 100 µA
1.65 V to 3.6 V 0.2
I
OL =
100
µ
A
2.7 V to 3.6 V 0.2
VOL
IOL = 4 mA 1.65 V 0.45
V
V
OL IOL = 8 mA 2.3 V 0.7
V
IOL = 12 mA 2.7 V 0.4 0.4
IOL = 24 mA 3 V 0.55 0.55
IIControl inputs VI = 0 to 5.5 V 3.6 V ±5±5µA
Ioff VI or VO = 5.5 V 0 ±10 µA
IOZ‡VO = 0 to 5.5 V 3.6 V ±15 ±10 µA
ICC
VI = VCC or GND
IO=0
36V
10 10
µA
I
CC 3.6 V ≤ VI ≤ 5.5 V§
I
O =
0
3
.
6
V
10 10 µ
A
∆ICC One input at VCC – 0.6 V,
Other inputs at
VCC or GND 2.7 V to 3.6 V 500 500 µA
CiControl inputs VI = VCC or GND 3.3 V 4.5 4.5 pF
Cio A or B ports VO = VCC or GND 3.3 V 7.5 7.5 pF
†All typical values are at VCC = 3.3 V, TA = 25°C.
‡For I/O ports, the parameter IOZ includes the input leakage current.
§This applies in the disabled state only.
timing requirements over recommended operating free-air temperature range (unless otherwise
noted) (see Figure 4)
SN54LVC646A
VCC = 2.7 V VCC = 3.3 V
± 0.3 V UNIT
MIN MAX MIN MAX
fclock Clock frequency 150 150 MHz
twPulse duration 3.3 3.3 ns
tsu Setup time, data before CLK↑1.6 1.5 ns
thHold time, data after CLK↑1.7 1.7 ns
SN54LVC646A, SN74LVC646A
OCTAL BUS TRANSCEIVERS AND REGISTERS
WITH 3-STATE OUTPUTS
SCAS302G – JANUARY 1993 – REVISED JUNE1998
8POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
timing requirements over recommended operating free-air temperature range (unless otherwise
noted) (see Figures 2 through 4)
SN74LVC646A
VCC = 1.8 V
± 0.15 V VCC = 2.5 V
± 0.2 V VCC = 2.7 V VCC = 3.3 V
± 0.3 V UNIT
MIN MAX MIN MAX MIN MAX MIN MAX
fclock Clock frequency † † 150 150 MHz
twPulse duration † † 3.3 3.3 ns
tsu Setup time, data before CLK↑† † 1.6 1.5 ns
thHold time, data after CLK↑† † 1.7 1.7 ns
†This information was not available at the time of publication.
switching characteristics over recommended operating free-air temperature range (unless
otherwise noted) (see Figure 4)
SN54LVC646A
PARAMETER FROM
(INPUT) TO
(OUTPUT) VCC = 2.7 V VCC = 3.3 V
± 0.3 V UNIT
MIN MAX MIN MAX
fmax 150 150 MHz
A or B B or A 7.9 1 7.4
tpd CLK
8.8 1 8.4 ns
SBA or SAB
9.9 1 8.6
ten OE A 10.2 1 8.2 ns
tdis OE A 8.9 1 7.5 ns
ten DIR B 10.4 1 8.3 ns
tdis DIR B 8.7 1 7.9 ns
switching characteristics over recommended operating free-air temperature range (unless
otherwise noted) (see Figures 2 through 4)
SN74LVC646A
PARAMETER FROM
(INPUT) TO
(OUTPUT) VCC = 1.8 V
± 0.15 V VCC = 2.5 V
± 0.2 V VCC = 2.7 V VCC = 3.3 V
± 0.3 V UNIT
MIN MAX MIN MAX MIN MAX MIN MAX
fmax † † 150 150 MHz
A or B B or A † † † † 7.9 1.4 7.4
tpd CLK
AorB
† † † † 8.8 1.3 8.4 ns
SBA or SAB
A
or
B
† † † † 9.9 1.4 8.6
ten OE A † † † † 10.2 1 8.2 ns
tdis OE A † † † † 8.9 1 7.5 ns
ten DIR B † † † † 10.4 1.2 8.3 ns
tdis DIR B † † † † 8.7 1.1 7.9 ns
†This information was not available at the time of publication.
SN54LVC646A, SN74LVC646A
OCTAL BUS TRANSCEIVERS AND REGISTERS
WITH 3-STATE OUTPUTS
SCAS302G – JANUARY 1993 – REVISED JUNE1998
9
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
operating characteristics, TA = 25°C
PARAMETER TEST
CONDITIONS
VCC = 1.8 V
± 0.15 V VCC = 2.5 V
± 0.2 V VCC = 3.3 V
± 0.3 V UNIT
CONDITIONS
TYP TYP TYP
Cpd
Power dissipation capacitance Outputs enabled
f=10MHz
† † 75 p
F
C
p
d
per transceiver Outputs disabled
f
=
10
MH
z††9
pF
†This information was not available at the time of publication.
SN54LVC646A, SN74LVC646A
OCTAL BUS TRANSCEIVERS AND REGISTERS
WITH 3-STATE OUTPUTS
SCAS302G – JANUARY 1993 – REVISED JUNE1998
10 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
PARAMETER MEASUREMENT INFORMATION
VCC = 1.8 V ± 0.15 V
VCC/2
VCC/2
VCC/2VCC/2
VCC/2VCC/2
VCC/2
VCC/2
VOH
VOL
th
tsu
From Output
Under Test
CL = 30 pF
(see Note A)
LOAD CIRCUIT
S1 Open
GND
1k Ω
1k Ω
Output
Control
(low-level
enabling)
Output
W aveform 1
S1 at 2 × VCC
(see Note B)
Output
W aveform 2
S1 at Open
(see Note B)
tPZL
tPZH
tPLZ
tPHZ
0 V
VOL + 0.15 V
VOH – 0.15 V
0 V
VCC
0 V
0 V
tw
VCC VCC
VOLTAGE WAVEFORMS
SETUP AND HOLD TIMES
VOLTAGE WAVEFORMS
PULSE DURATION
VOLTAGE WAVEFORMS
ENABLE AND DISABLE TIMES
Timing
Input
Data
Input
Input
tpd
tPLZ/tPZL
tPHZ/tPZH
Open
2 × VCC
Open
TEST S1
NOTES: A. CL includes probe and jig capacitance.
B. W aveform 1 is for an output with internal conditions such that the output is low except when disabled by the output control.
W aveform 2 is for an output with internal conditions such that the output is high except when disabled by the output control.
C. All input pulses are supplied by generators having the following characteristics: PRR≤10 MHz, ZO = 50 Ω, tr≤2 ns, tf≤2 ns.
D. The outputs are measured one at a time with one transition per measurement.
E. tPLZ and tPHZ are the same as tdis.
F. tPZL and tPZH are the same as ten.
G. tPLH and tPHL are the same as tpd.
0 V
VCC
VCC/2
tPHL
VCC/2 VCC/2 VCC
0 V
VOH
VOL
Input
Output
VOLTAGE WAVEFORMS
PROPAGATION DELAY TIMES
VCC/2 VCC/2
tPLH
2 × VCC
VCC
Figure 2. Load Circuit and Voltage Waveforms
SN54LVC646A, SN74LVC646A
OCTAL BUS TRANSCEIVERS AND REGISTERS
WITH 3-STATE OUTPUTS
SCAS302G – JANUARY 1993 – REVISED JUNE1998
11
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
PARAMETER MEASUREMENT INFORMATION
VCC = 2.5 V ± 0.2 V
VCC/2
VCC/2
VCC/2VCC/2
VCC/2VCC/2
VCC/2
VCC/2
VOH
VOL
th
tsu
From Output
Under Test
CL = 30 pF
(see Note A)
LOAD CIRCUIT
S1 Open
GND
500 Ω
500 Ω
Output
Control
(low-level
enabling)
Output
W aveform 1
S1 at 2 × VCC
(see Note B)
Output
W aveform 2
S1 at GND
(see Note B)
tPZL
tPZH
tPLZ
tPHZ
0 V
VOL + 0.15 V
VOH – 0.15 V
0 V
VCC
0 V
0 V
tw
VCC VCC
VOLTAGE WAVEFORMS
SETUP AND HOLD TIMES
VOLTAGE WAVEFORMS
PULSE DURATION
VOLTAGE WAVEFORMS
ENABLE AND DISABLE TIMES
Timing
Input
Data
Input
Input
tpd
tPLZ/tPZL
tPHZ/tPZH
Open
2 × VCC
GND
TEST S1
NOTES: A. CL includes probe and jig capacitance.
B. W aveform 1 is for an output with internal conditions such that the output is low except when disabled by the output control.
W aveform 2 is for an output with internal conditions such that the output is high except when disabled by the output control.
C. All input pulses are supplied by generators having the following characteristics: PRR≤10 MHz, ZO = 50 Ω, tr≤2 ns, tf≤2 ns.
D. The outputs are measured one at a time with one transition per measurement.
E. tPLZ and tPHZ are the same as tdis.
F. tPZL and tPZH are the same as ten.
G. tPLH and tPHL are the same as tpd.
0 V
VCC
VCC/2
tPHL
VCC/2 VCC/2 VCC
0 V
VOH
VOL
Input
Output
VOLTAGE WAVEFORMS
PROPAGATION DELAY TIMES
VCC/2 VCC/2
tPLH
2 × VCC
VCC
Figure 3. Load Circuit and Voltage Waveforms
SN54LVC646A, SN74LVC646A
OCTAL BUS TRANSCEIVERS AND REGISTERS
WITH 3-STATE OUTPUTS
SCAS302G – JANUARY 1993 – REVISED JUNE1998
12 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
PARAMETER MEASUREMENT INFORMATION
VCC = 2.7 V AND 3.3 V ± 0.3 V
VOH
VOL
th
tsu
From Output
Under Test
CL = 50 pF
(see Note A)
LOAD CIRCUIT
S1
6 V
Open
GND
500 Ω
500 Ω
tPLH tPHL
Output
Control
(low-level
enabling)
Output
W aveform 1
S1 at 6 V
(see Note B)
Output
W aveform 2
S1 at GND
(see Note B)
tPZL
tPZH
tPLZ
tPHZ
1.5 V1.5 V
1.5 V 1.5 V 2.7 V
0 V
1.5 V 1.5 V VOH
VOL
0 V
1.5 V VOL + 0.3 V
1.5 V VOH – 0.3 V
0 V
1.5 V 2.7 V
0 V
1.5 V 1.5 V 0 V
2.7 V
0 V
1.5 V 1.5 V
tw
Input
2.7 V 2.7 V
3 V
VOLTAGE WAVEFORMS
SETUP AND HOLD TIMES
VOLTAGE WAVEFORMS
PROPAGATION DELAY TIMES
VOLTAGE WAVEFORMS
PULSE DURATION
VOLTAGE WAVEFORMS
ENABLE AND DISABLE TIMES
Timing
Input
Data
Input
Output
Input
tpd
tPLZ/tPZL
tPHZ/tPZH
Open
6 V
GND
TEST S1
NOTES: A. CL includes probe and jig capacitance.
B. W aveform 1 is for an output with internal conditions such that the output is low except when disabled by the output control.
W aveform 2 is for an output with internal conditions such that the output is high except when disabled by the output control.
C. All input pulses are supplied by generators having the following characteristics: PRR≤10 MHz, ZO = 50 Ω, tr≤2.5 ns, tf≤2.5 ns.
D. The outputs are measured one at a time with one transition per measurement.
E. tPLZ and tPHZ are the same as tdis.
F. tPZL and tPZH are the same as ten.
G. tPLH and tPHL are the same as tpd.
Figure 4. Load Circuit and Voltage Waveforms
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