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MAX3442EESA+

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P19
Selector Guide
General Description
The MAX3440E–MAX3444E fault-protected RS-485 and
J1708 transceivers feature ±60V protection from signal
faults on communication bus lines. Each device contains
one differential line driver with three-state output and one
differential line receiver with three-state input. The 1/4-unit-
load receiver input impedance allows up to 128 trans-
ceivers on a single bus. The devices operate from a 5V
supply at data rates of up to 10Mbps. True fail-safe inputs
guarantee a logic-high receiver output when the receiver
inputs are open, shorted, or connected to an idle data line.
Hot-swap circuitry eliminates false transitions on the
data bus during circuit initialization or connection to a
live backplane. Short-circuit current-limiting and ther-
mal shutdown circuitry protect the driver against exces-
sive power dissipation, and on-chip ±15kV ESD
protection eliminates costly external protection devices.
The MAX3440E–MAX3444E are available in 8-pin SO
and PDIP packages and are specified over industrial
and automotive temperature ranges.
Applications
RS-422/RS-485 Communications
Truck and Trailer Applications
Industrial Networks
Telecommunications Systems
Automotive Applications
HVAC Controls
Features
♦ ±15kV ESD Protection
♦ ±60V Fault Protection
♦ Guaranteed 10Mbps Data Rate
(MAX3441E/MAX3443E)
♦ Hot Swappable for Telecom Applications
♦ True Fail-Safe Receiver Inputs
♦ Enhanced Slew-Rate-Limiting Facilitates
Error-Free Data Transmission
(MAX3440E/MAX3442E/MAX3444E)
♦ Allow Up to 128 Transceivers on the Bus
♦ -7V to +12V Common-Mode Input Range
♦ Automotive Temperature Range (-40°C to +125°C)
♦ Industry-Standard Pinout
MAX3440E–MAX3444E
±15kV ESD-Protected, ±60V Fault-Protected,
10Mbps, Fail-Safe RS-485/J1708 Transceivers
________________________________________________________________
Maxim Integrated Products
1
TOP VIEW
1
2
3
4
8
5
V
CC
GND
DI
DE/RE
RO
FAULT
R
D
Rt
Rt
7
6
D
R
DE/RE
FAULT
DI
RO
A
B
1
2
3
4
8
7
6
5
V
CC
B
A
GND
DI
DE/RE
RO
FAULT
+
+
DIP/SO DIP/SO
B
A
MAX3440E
MAX3441E
R
D
Pin Configurations and Typical Operating Circuits
Ordering Information
19-2666; Rev 2; 11/10
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
PART TEMP RANGE PIN-PACKAGE
MAX3440EESA+ -40°C to +85°C 8 SO
MAX3440EEPA+ -40°C to +85°C 8 PDIP
MAX3440EASA+ -40°C to +125°C 8 SO
MAX3440EAPA+ -40°C to +125°C 8 PDIP
PART TYPE
DATA RATE
(Mbps)
LOW-POWER
SHUTDOWN
RECEIVER/DRIVER
ENABLE
TRANSCEIVERS
ON BUS
HOT SWAP
MAX3440E RS-485 0.25 No Yes 128 Yes
MAX3441E RS-485 2.5 to 10 No Yes 128 Yes
MAX3442E RS-485 0.25 Yes Yes 128 Yes
MAX3443E RS-485 2.5 to 10 Yes Yes 128 Yes
MAX3444E J1708 0.25 Yes Yes 128 Yes (only RE)
+
Denotes a lead(Pb)-free/RoHS-compliant package.
Ordering Information continued at end of data sheet.
Pin Configurations and Typical Operating Circuits continued at end of data sheet.
MAX3440E–MAX3444E
±15kV ESD-Protected, ±60V Fault-Protected,
10Mbps, Fail-Safe RS-485/J1708 Transceivers
2 _______________________________________________________________________________________
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.
Voltages Referenced to GND
V
CC
........................................................................................+7V
FAULT, DE/RE, RE, DE, DE, DI, TXD..........-0.3V to (V
CC
+ 0.3V)
A, B (Note 1) ........................................................................±60V
RO ..............................................................-0.3V to (V
CC
+ 0.3V)
Short-Circuit Duration (RO, A, B) ...............................Continuous
Continuous Power Dissipation (T
A
= +70°C)
SO (derate 5.9mW/°C above +70°C)...........................471mW
PDIP (derate 9.09mW/°C above +70°C)......................727mW
Operating Temperature Ranges
MAX344_EE_ _ ...............................................-40°C to +85°C
MAX344_EA_ _ .............................................-40°C to +125°C
Storage Temperature Range .............................-65°C to +150°C
Junction Temperature......................................................+150°C
Lead Temperature (soldering, 10s) .................................+300°C
Soldering Temperature (reflow) .......................................+260°C
DC ELECTRICAL CHARACTERISTICS
(V
CC
= +4.75V to +5.25V, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at V
CC
= +5V and T
A
= +25°C.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
DRIVER
Figure 1, R
L
= 100 2 V
CC
Differential Driver Output V
OD
Figure 1, R
L
= 54 1.5 V
CC
V
Change in Magnitude of
Differential Output Voltage
V
OD
Figure 1, R
L
= 100 or 54 (Note 2) 0.2 V
Driver Common-Mode
Output Voltage
V
OC
Figure 1, R
L
= 100 or 54 V
CC
/ 2 3 V
Change in Magnitude of
Common-Mode Voltage
V
OC
Figure 1, R
L
= 100 or 54 (Note 2) 0.2 V
DRIVER LOGIC
Driver Input High Voltage V
DIH
2 V
Driver Input Low Voltage V
DIL
0.8 V
Driver Input Current I
DIN
±2 μA
0V V
OUT
+12V +350
Driver Short-Circuit Output Current
(Note 3)
I
OSD
-7V V
OUT
V
CC
-350
mA
(V
CC
- 1V) V
OUT
+12V (Note 3) +25
Driver Short-Circuit Foldback
Output Current
I
OSDF
-7V V
OUT
+1V (Note 3) -25
mA
RECEIVER
V
CC
= GND, V
A, B
= 12V 250
V
A, B
= -7V -150
μA
Input Current I
A,B
A, B
V
A, B
= ±60V ±6 mA
Receiver Differential Threshold
Voltage
V
TH
-7V V
CM
+12V -200 -50 mV
Receiver Input Hysteresis V
TH
25 mV
Note 1: A, B must be terminated with 54Ω or 100Ω to guarantee ±60V fault protection.
MAX3440E–MAX3444E
±15kV ESD-Protected, ±60V Fault-Protected,
10Mbps, Fail-Safe RS-485/J1708 Transceivers
_______________________________________________________________________________________ 3
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
RECEIVER LOGIC
Output High Voltage V
OH
Figure 2, I
OH
= -1.6mA V
CC
- 0.6 V
Output Low Voltage V
OL
Figure 2, I
OL
= 1mA 0.4 V
Three-State Output Current at
Receiver
I
OZR
0V V
A, B
V
CC
±1 μA
Receiver Input Resistance R
IN
-7V V
CM
+12V 48 k
Receiver Output Short-Circuit
Current
I
OSR
0V V
RO
V
CC
±95 mA
CONTROL
Control Input High Voltage V
CIH
DE, DE, RE, DE/RE 2 V
Input Current Latch During First
Rising Edge
I
IN
DE, DE/RE, RE 90 μA
SUPPLY CURRENT
MAX3440E (DE/RE = V
CC
),
MAX3442E (DE = V
CC
,
RE = GND),
MAX3444E (DE = RE = GND)
30
Normal Operation I
Q
No load,
DI = V
CC
or GND
MAX3441E (DE/RE = V
CC
),
MAX3443E (DE = V
CC
,
RE = GND)
10
mA
DE = GND, RE = V
CC
(MAX3442E/
MAX3443E)
20
DE = GND, RE = V
CC
, T
A
= +25°C
(MAX3442E/MAX3443E)
10
DE = RE = V
CC
(MAX3444E) 100
Supply Current in Shutdown Mode I
SHDN
DE = RE = V
CC
, T
A
= +25°C (MAX3444E) 10
μA
Supply Current with Output Shorted
to ±60V
I
SHRT
DE = GND, RE = GND, no load
output in three-state (MAX3443E)
±15 mA
DC ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= +4.75V to +5.25V, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at V
CC
= +5V and T
A
= +25°C.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Overvoltage Protection A, B; R
SOURCE
= 0, R
L
= 54 ±60 V
ESD Protection A, B Human Body Model ±15 kV
FAULT DETECTION
Receiver Differential Threshold F
DIPH
V
CM
= 0V, high limit 270 450 mV
Receiver Differential Threshold F
DIPL
V
CM
= 0V, low limit -450 -270 mV
Fault-Detection Common-Mode
Input Voltage Positive
12 V
Fault-Detection Common-Mode
Input Voltage Negative
-7 V
PROTECTION SPECIFICATIONS
(V
CC
= +4.75V to +5.25V, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at V
CC
= +5V and T
A
= +25°C.)
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P19

MAX3442EESA+

Mfr. #:
Buy MAX3442EESA+
Manufacturer:
Maxim Integrated
Description:
RS-485 Interface IC 10Mbps Fail-Safe RS-485/J1708 Tcvr
Lifecycle:
New from this manufacturer.
Delivery:
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