General Description
The MAX3050 and MAX3057 interface between the
CAN protocol controller and the physical wires of the bus
lines in a control area network (CAN). They are primarily
intended for systems requiring data rates up to 2Mbps
and feature ±80V fault protection against shorts in high-
voltage power buses. They provide differential transmit
capability to the bus and differential receive capability to
the CAN controller.
The MAX3050 and MAX3057 have four modes of operation:
high speed, slope control, standby, and shutdown. High-
speed mode allows data rates up to 2Mbps. In slope-control
mode, data rates are 40kbps to 500kbps, so the effects of
EMI are reduced, and unshielded twisted or parallel cable
can be used. In standby mode, the transmitters are shut off
and the receivers are put into low-current mode. In shutdown
mode, the transmitter and receiver are switched off.
The MAX3050 has an AutoShutdown™ function that puts
the device into a 15ms shutdown mode when the bus or
CAN controller is inactive for 4ms or longer.
The MAX3050 and MAX3057 are available in an 8-pin
SO package and are specified for operation from -40°C
to +125°C.
Applications
●HVAC Controls
●Telecom 72V systems
Features
●±80V Fault Protection for 42V Systems
●Four Operating Modes:
• High-Speed Operation Up to 2Mbps
• Slope-Control Mode to Reduce EMI
(40kbps to 500kbps)
• Standby Mode
• Low-Current Shutdown Mode
●AutoShutdown when Device is Inactive (MAX3050)
●Automatic Wake-Up from Shutdown (MAX3050)
●Thermal Shutdown
●Current Limiting
●Fully Compatible with the ISO 11898 Standard
19-2670; Rev 1; 6/14
AutoShutdown is a trademark of Maxim Integrated Products, Inc.
PART TEMP RANGE PIN-PACKAGE
MAX3050ASA -40°C to +125°C 8 SO
MAX3057ASA -40°C to +125°C 8 SO
CANL
RXD
1
2
8
7
RS
CANHGND
VCC
TXD
SO
TOP VIEW
3
4
6
5
MAX3050
MAX3057
SHDN
MAX3050
MAX3057
CAN
CONTROLLER
TXD
VCC
RXD
RS GND
CANH
CANL
VCC
(100nF)
120Ω
120Ω
TX0
RX0
GND
0.1µF
30pF
24kΩ TO 180kΩ
SHDN
( ) ARE FOR 3050 ONLY.
MAX3050/MAX3057 ±80V Fault-Protected, 2Mbps, Low-Supply
Current CAN Transceivers
Ordering Information
Pin Conguration
Typical Operating Circuit
VCC to GND ............................................................ -0.3V to +6V
TXD, RS, RXD, SHDN to GND....................-0.3V to (VCC + 0.3V)
RXD Shorted to GND................................................. Continuous
CANH, CANL to GND...........................-80V to +80V Continuous
Continuous Power Dissipation (TA = +70°C)
8-Pin SO (derate 5.9mW/°C above +70°C) .................470mW
Operating Temperature Range .........................-40°C to +125°C
Junction Temperature......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) ................................+300°C
(VCC = +5V ±10%, RL = 60Ω, RS = GND, TA = TMIN to TMAX. Typical values are at VCC = +5V and TA = +25°C.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Supply Current IS
Dominant (Note 1) 56 72
mA
Dominant no load 6
Recessive (Note 1) 3.6 5.5
Recessive no load 5.5
Quiescent Current Standby Mode IQVRS = VCC 125 260 µA
Shutdown Supply Current IQSHDN SHDN = GND 15 30 µA
Thermal-Shutdown Threshold 160 °C
Thermal-Shutdown Hysteresis 20 °C
TXD INPUT LEVELS
High-Level Input Voltage VIH 2 V
Low-Level Input Voltage VIL 0.4 V
High-Level Input Current IIH VTXD = VCC 1 µA
Pullup Resistor RINTXD 20 kΩ
CANH, CANL TRANSMITTER
Recessive Bus Voltage VCANH,
VCANL VTXD = VCC, no load 2 3 V
Off-State Output Leakage ILO
-2V < VCANH, VCANL < +7V
SHDN = GND, VTXD = VCC -2 +1
mA
-80V < VCANH, VCANL < +80V
SHDN = GND, VTXD = VCC -4 +4
CANH Output Voltage VCANH VTXD = 0 3.0 VCC V
CANL Output Voltage VCANL VTXD = 0 0 2.0 V
Differential Output
(VCANH - VCANL)
DVCANH,
VCANL
VTXD = 0 1.5 5 V
VTXD = 0, RL = 45Ω 1.5
VTXD = VCC, no load -500 +50 mV
CANH Short-Circuit Current ISC VCANH = -5V -200 mA
CANL Short-Circuit Current ISC VCANL = 18V 200 mA
ESD CANH, CANL (Note 2)
Human Body Model ±2
kVIEC1000-4-2 Air Gap ±3
IEC1000-4-2 Contact Discharge ±2.5
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Absolute Maximum Ratings
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 in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect
device reliability.
DC Electrical Characteristics
(VCC = +5V ±10%, RL = 60Ω, RS = GND, TA = TMIN to TMAX. Typical values are at VCC = +5V and TA = +25°C.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
DC Bus Receiver (VTXD = VCC; CANH and CANL externally driven; -2V < VCANH, VCANL < +7V, unless otherwise specied)
Differential Input Voltage
(Recessive) VDIFF -7V < VCANH, VCANL < +12V -1.0 +0.5 V
Differential Input Voltage
(Dominant) VDIFF -7V < VCANH, VCANL < +12V 0.9 3.3 V
Differential Input Hysteresis VDIFF
(HYST) 150 mV
CANH Input Wake-Up Voltage
Threshold
VCANH
(SHDN)
SHDN = GND, VTXD = VCC (MAX3050) 6 9 V
RXD High-Level Output Voltage VOH I = -100µA 0.8 x
VCC V
RXD Low-Level Output Voltage VOL
I = 10mA 0.8 V
I = 5mA 0.4
CANH and CANL Input
Resistance RI5 25 kΩ
Differential Input Resistance RDIFF 10 100 kΩ
MODE SELECTION (RS)
Input Voltage for High Speed VSLP 0.3 x
VCC V
Input Voltage for Standby VSTBY 0.75 x
VCC V
Slope-Control Mode Voltage VSLOPE RRS = 24kΩ to 180kΩ 0.4 x
VCC
0.6 x
VCC V
Slope-Control Mode Current ISLOPE RRS = 24kΩ to 180kΩ -10 -200 µA
Standby Mode ISTBY -10 +10 µA
High-Speed Mode Current IHS VRS = 0 -500 µA
SHUTDOWN
SHDN Input Pullup Resistor RINSHDN MAX3057 500 900 kΩ
SHDN Input Voltage High 2 V
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DC Electrical Characteristics (continued)
(VCC = +5V ±10%, RL = 60Ω, CL = 100pF, TA = TMIN to TMAX. Typical values are at VCC = +5V and TA = +25°C.) (Figures 1, 2, and 3)
Note 1: As defined by ISO, bus value is one of two complementary logical values: dominant or recessive. The dominant value
represents the logical 1 and the recessive represents the logical 0. During the simultaneous transmission of the dominant
and recessive bits, the resulting bus value is dominant. For MAX3050 and MAX3057 values, see the truth table in the
Transmitter and Receiver sections under Detailed Description.
Note 2: The ESD structures do not short out CANH and CANL under an ESD event while -7V < CANH, CANL < +12V.
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
TIMING
Minimum Bit Time tBIT
VRS = 0 (2Mbps) 0.5
µs
RRS = 24kΩ (500kbps) 2
RRS = 100kΩ (125kbps) 8
RRS = 180kΩ (62.5kbps) 25
Delay TXD to Bus Active tONTXD VRS = 0 40 ns
Delay TXD to Bus Inactive tOFFTXD VRS = 0 75 ns
Delay TXD to Receiver Active tONRXD
VRS = 0 (2Mbps) 120 ns
RRS = 24kΩ (500kbps) 0.4
µsRRS = 100kΩ (125kbps) 1.6
RRS = 180kΩ (62.5kbps) 5.0
Delay TXD to Receiver Inactive tOFFRXD
VRS = 0 (2Mbps) 130 ns
RRS = 24kΩ (500kbps) 0.45
µsRRS = 100kΩ (125kbps) 1.6
RRS = 180kΩ (62.5kbps) 5.0
Differential Output Slew Rate SR
RRS = 24kΩ (500kbps) 14
V/µs RRS = 100kΩ (125kbps) 7
RRS = 180kΩ (62.5kbps) 1.6
Bus Dominant to RXD Low Standby mode 10 µs
Time to Wake Up: CANH > 9V tWAKE SHDN = GND, VTXD = VCC (MAX3050) 10 µs
Time to Sleep Mode when Bus Is
Recessive tSHDN CSHDN = 100nF (MAX3050) 10 47 ms
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Timing Characteristics
Figure 1. AC Test Circuit
Figure 2. Timing Diagram for Dynamic Characteristics Figure 3. Time to Wake-Up (tWAKE) (MAX3050)
MAX3050
MAX3057
CAN
CONTROLLER
TXD
VCC
RXD
RS GND
CANH
CANL
VCC
(100nF)
120Ω
120Ω
TX0
RX0
GND
0.1µF
30pF
24kΩ TO 180kΩ
SHDN
100pF
( ) ARE FOR MAX3050 ONLY.
CANH - CANL
RXD
TXD
CANL
CANH
0.9V
VCC/2
VCC/2
tONRXD
tONTXD
tOFFRXD
tOFFTXD
0.5V RECESSIVE
DOMINANT
9V
CANH
tWAKE
VSHDN
VSHDN = 2V
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(VCC = 5V, RL = 60Ω, CL = 100pF, TA = +25°C, unless otherwise specied.)
MAX3050 toc02
SLEEP TIME (ms)
300200100
20
40
60
80
100
0
0 400
AUTOSHUTDOWN VS. CSHDN
CSHDN (nF)
SUPPLY CURRENT vs. DATA RATE
MAX3050 toc03
DATA RATE (kbps)
SUPPLY CURRENT (mA)
16001200800400
27
29
31
33
35
25
0 2000
TA = +125°C
TA = +25°C
TA = -40°C
RECEIVER PROPAGATION DELAY
vs. TEMPERATURE, RRS = GND
MAX3050 toc04
TEMPERATURE (°C)
RECEIVER PROPAGATION DELAY (ns)
905520-15
25
35
45
55
65
15
-50 125
RECESSIVE
DOMINANT
DRIVER PROPAGATION DELAY
vs. TEMPERATURE, RRS = GND
MAX3050 toc05
TEMPERATURE (°C)
DRIVER PROPAGATION DELAY (ns)
925926-7
20
25
30
35
15
-40 125
RECESSIVE
DOMINANT
RECEIVER OUTPUT LOW
vs. OUTPUT CURRENT
MAX3050 toc06
OUTPUT CURRENT (mA)
VOLTAGE RXD (mV)
2015105
400
800
1200
1600
0
0 25
TA = +125°C
TA = +25°C
TA = -40°C
RECEIVER OUTPUT HIGH
vs. OUTPUT CURRENT
MAX3050 toc07
OUTPUT CURRENT (mA)
VOLTAGE RXD (mV)
2015105
600
1200
1800
3000
2400
0
0 25
TA = +125°C
TA = +25°C
TA = -40°C
SLEW RATE vs. RRS
MAX3057
MAX3050 toc01
RRS (kΩ)
SLEW RATE (V/µs)
1621248648
5
10
15
20
25
0
10 200
TA = -40°C
TA = +25°C
TA = -+125°C
DIFFERENTIAL VOLTAGE
vs. DIFFERENTIAL LOAD RL
MAX3050 toc08
DIFFERENTIAL LOAD RL (Ω)
DIFFERENTIAL VOLTAGE (V)
25020015010050
1
2
3
4
0
0 300
TA = +125°C
TA = +25°C
TA = -40°C
SUPPLY CURRENT
vs. TEMPERATURE IN STANDBY MODE
MAX3050 toc09
TEMPERATURE (°C)
SUPPLY CURRENT (µA)
905520-15
75
100
125
150
175
200
50
-50 125
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Typical Operating Characteristics
(VCC = 5V, RL = 60Ω, CL = 100pF, TA = +25°C, unless otherwise specied.)
PIN NAME FUNCTION
1 TXD Transmit Data Input. TXD is a CMOS/TTL-compatible input from a CAN controller.
2 GND Ground
3 VCC Supply Voltage. Bypass VCC to GND with a 0.1µF capacitor.
4 RXD Receive Data Output. RXD is a CMOS/TTL-compatible output from the physical bus lines CANH and CANL.
5SHDN Shutdown Input. Drive SHDN low to put into shutdown mode. See the Detailed Description section for a full
explanation of SHDN behavior.
6 CANL CAN Bus Line Low. CANL is fault protected to ±80V.
7 CANH CAN Bus Line High. CANH is fault protected to ±80V.
8 RS
Mode Select Pin. Drive RS low or connect to GND for high-speed operation. Connect a resistor from RS to
GND to control output slope. Drive RS high to put into standby mode. See the Mode Selection section under
Detailed Description.
LOOPBACK PROPAGATION DELAY vs. RRS
MAX3050 toc10
RRS (kΩ)
LOOPBACK PROPAGATION DELAY (ns)
15010050
200
400
600
800
1000
1200
1400
0
0 200
RECEIVER PROPAGATION DELAY
MAX3050 toc11
40ns/div
RXD
2V/div
CANH - CANL
DRIVER PROPAGATION DELAY
MAX3050 toc12
40ns/div
TXD
2V/div
CANH - CANL
RRS = GND
DRIVER PROPAGATION DELAY
MAX3050 toc13
1µs/div
TXD
5V/div
RRS = 24kΩ
RRS = 100kΩ
RRS = 180kΩ
MAX3050/MAX3057 ±80V Fault-Protected, 2Mbps, Low-Supply
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Pin Description
Typical Operating Characteristics (continued)
Detailed Description
The MAX3050 and MAX3057 interface between the
protocol controller and the physical wires of the bus lines
in a CAN. They are primarily intended for applications
requiring data rates up to 2Mbps and feature ±80V fault
protection against shorts in high-voltage systems. This
fault protection allows the devices to withstand up to ±80V
with respect to ground with no damage to the device.
The built-in fault tolerance allows the device to survive
in industrial environments with no external protection
devices. The devices provide differential transmit capabil-
ity to the bus and differential receive capability to the CAN
controller. (See Figure 4.)
The device has four modes of operation: high speed, slope
control, standby, and shutdown. In high-speed mode, slew
rates are not limited, making 2Mbps transmission speeds
possible. Slew rates are controlled in slopecontrol mode,
minimizing EMI and allowing use of unshielded twisted or
parallel cable. In standby mode, receivers are active and
transmitters are in high impedance. In shutdown mode,
transmitters and receivers are turned off.
The transceivers are designed to operate from a single
+5V supply and draw 56mA of supply current in dominant
state and 3.6mA in recessive state. In standby mode,
supply current is reduced to 135μA. In shutdown mode,
supply current is 15μA.
CANH and CANL are output short-circuit current-limited
and are protected against excessive power dissipation by
thermal-shutdown circuitry that places the driver outputs
into a high-impedance state.
Fault Protection
The MAX3050 and MAX3057 feature ±80V fault protec-
tion. This extended voltage range of CANH and CANL
bus lines allows use in high-voltage systems and com
munication with high-voltage buses. If data is transmitting
at 2Mbps, the fault protection is reduced to ±70V.
Transmitter
The transmitter converts a single-ended input (TXD) from
the CAN controller to differential outputs for the bus lines
(CANH, CANL). The truth table for the transmitter and
receiver is given in Table 1.
Figure 4. Functional Diagram
0.75V
THERMAL
SHUTDOWN
TRANSMITTER
CONTROL
MODE
SELECTION
AUTO
SHUTDOWN
RECEIVER
7.5V
VCC
RS
RXD
GND
CANL
CANH
TXD
MAX3050
MAX3057
SHDN
WAKE
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High Speed
Connect RS to ground to set the MAX3050 and MAX3057
to high-speed mode. When operating in high-speed
mode, the MAX3050 and MAX3057 can achieve trans-
mission rates of up to 2Mbps. Line drivers are switched on
and off as quickly as possible. However, in this mode, no
measures are taken to limit the rise and fall slope of the
data signal, allowing for potential EMI emissions. If using
the MAX3050 and MAX3057 in high-speed mode, use
shielded twistedpair cable to avoid EMI problems.
Slope Control
Connect a resistor from RS to ground to select slope-
control mode. (See Table 2.) In slope-control mode, the
gates of the line drivers are charged with a controlled
current, proportional to the resistor connected to the RS
pin. Transmission speed ranges from 40kbps to 500kbps.
Controlling the rise and fall slope reduces EMI and allows
the use of an unshielded twisted pair or a parallel pair of
wires as bus lines. The transfer function for selecting the
resistor value is given by:
RRS (kΩ) = 12000/speed (in kbps).
See the Slew Rate vs. RRS graph in the Typical Operating
Characteristics section.
Shutdown
In shutdown mode, the device is switched off. The outputs
are high impedance to ± 80V. The MAX3057 features a pul-
lup at SHDN. If shutdown is forced low and then left floating,
the device remains in shutdown until SHDN is forced high.
Receiver
The receiver reads differential input from the bus lines
(CANH, CANL) and transfers this data as a singleended
output (RXD) to the CAN controller. It consists of a compar-
ator that senses the difference ΔV = (CANH - CANL) with
respect to an internal threshold of 0.7V. If this difference is
positive (i.e., ΔV > 0.7V) a logic-low is present at the RXD
pin. If negative (i.e., ΔV < 0.7V), a logic-high is present.
The receiver always echoes the transmitted data.
The CANH and CANL common-mode range is -7V to
+12V. RXD is logic high when CANH and CANL are short-
ed or terminated and undriven. If the differential receiver
input voltage (CANH - CANL) is less than or equal to 0.5V,
RXD is logic high. If (CANH - CANL) is greater than or
equal to 0.9V, RXD is logic low.
Standby
The MAX3050 and MAX3057 transmitters are threes-
tated, and the receivers are active in standby. This allows
the device to read data on the bus while reducing power
consumption.
Receivers take up to 10ms to wake up from standby
mode. Therefore, the first bits of information read off the
bus when coming out of standby can be lost.
Thermal Shutdown
If the junction temperature exceeds +160°C, the device is
switched off. The hysteresis is approximately 20°C, dis-
abling thermal shutdown once the temperature reaches
+140°C.
Table 1. Transmitter and Receiver Truth Table
Table 2. Mode Selection Truth Table
X = Don’t care.
* As defined by ISO, bus value is one of two complementary logical values: dominant or recessive. The dominant value represents
the logical 0 and the recessive represents the logical 1. During the simultaneous transmission of the dominant and recessive bits, the
resulting bus value is dominant.
TXD RS SHDN CANH CANL BUS STATE RXD
0 VRS < 0.75 x VCC VSHDN > 1.5V High Low Dominant* 0
1 or oat VRS < 0.75 x VCC VSHDN > 1.5V 5 to 25kΩ to VCC/2 5 to 25kΩ to VCC/2 Recessive* 1
X VRS > 0.75 x VCC X Floating Floating Floating 1
X X VSHDN < 0.5V Floating Floating Floating 1
CONDITION FORCED AT PIN RS MODE RESULTING CURRENT AT RS
VRS < 0.3 x VCC High speed |IRs| < 500µA
0.4 x VCC < VRS < 0.6 Ω VCC Slope control 10µA < |IRs| < 200µA
VRS > 0.75 x VCC Standby |IRs| < 10µA
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AutoShutdown (MAX3050)
To manage power consumption, AutoShutdown puts the
device into shutdown mode after it has been inac-tive
for a period of time. The value of an external capacitor
(CSHDN) connected to SHDN determines the threshold
of inactivity time, after which the AutoShutdown triggers.
Floating SHDN allows the MAX3050 to automatically
change from active mode to shutdown.
Use a 100nF capacitor as CSHDN for a typical threshold
of 20ms. Change the capacitor value according to the
following equation to change the threshold time period.
( )
CC
I (mA) time(µs)
C (nF) VV
×
=−
SHDN
SHDN
SHDN
Drive SHDN high to turn the MAX3050 on and disable
AutoShutdown.
When the MAX3050 is in shutdown mode, only the wake-
up comparator is active, and normal bus communication
is ignored. The remote master of the CAN system wakes
up the MAX3050 with a signal greater than 9V on CANH.
Internal circuitry in the MAX3050 puts the device in nor-
mal operation by driving SHDN high.
The MAX3057 does not have the AutoShutdown feature.
Driver Output Protection
The MAX3050 and MAX3057 have several features that
protect them from damage. Thermal shutdown switches
off the device and puts CANH and CANL into high
impedance if the junction temperature exceeds +160°C.
Thermal protection is needed particularly when a bus line
is short-circuited. The hysteresis for the thermal shutdown
is approximately 20°C.
Additionally, a current-limiting circuit protects the trans-
mitter output stage against short-circuit to positive and
negative battery voltage. Although the power dissipation
increases during this fault condition, this feature prevents
destruction of the transmitter output stage.
Applications Information
Reduced EMI and Reections
In slope-control mode, the CANH and CANL outputs are
slew-rate limited, minimizing EMI and reducing reflections
caused by improperly terminated cables. In general, a
transmitter’s rise time relates directly to the length of an
unterminated stub, which can be driven with only minor
waveform reflections. The following equation expresses
this relationship conservatively:
Length = tRISE / (15ns/ft)
where tRISE is the transmitter’s rise time.
Figure 5. FFT Dominant Bus at 2Mbpslayout.
Figure 6. FFT Recessive Bus at 2Mbps
Figure 7. FFT Dominant Bus at 500kbps
FFT
500mV/div
CANH - CANL
1V/div
FFT
200mV/div
CANH - CANL
1V/div
FFT
500mV/div
CANH - CANL
1V/div
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The MAX3050 and MAX3057 require no special layout
considerations beyond common practices. Bypass VCC to
GND with a 1μF ceramic capacitor mounted close to the
IC with short lead lengths and wide trace widths.
Figure 8. FFT Recessive Bus at 500kbps Figure 10. FFT Recessive Bus at 62.5kbps
Figure 9. FFT Dominant Bus at 62.5kbps
FFT
200mV/div
CANH - CANL
1V/div
FFT
200mV/div
CANH - CANL
1V/div
FFT
500mV/div
CANH - CANL
1V/div
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Chip Information
TRANSISTOR COUNT: 1214
PROCESS: BiCMOS
Package Information
For the latest package outline information and land patterns
(footprints), go to www.maximintegrated.com/packages. Note
that a “+”, “#”, or “-” in the package code indicates RoHS status
only. Package drawings may show a different suffix character,
but the drawing pertains to the package regardless of RoHS
status.
PACKAGE
TYPE
PACKAGE
CODE
OUTLINE
NO.
LAND
PATTERN NO.
8 SOIC S8+5 21-0041 90-0096
Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent licenses
are implied. Maxim Integrated reserves the right to change the circuitry and specications without notice at any time. The parametric values (min and max limits)
shown in the Electrical Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance.
Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc.
MAX3050/MAX3057 ±80V Fault-Protected, 2Mbps, Low-Supply
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Revision History
REVISION
NUMBER
REVISION
DATE DESCRIPTION PAGES
CHANGED
0 10/02 Initial release —
1 6/14 Removed automotive references 1, 8
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