MAX3440E Datasheet, PDF (1/20 Pages) Maxim Integrated Products – ±15kV ESD-Protected, ±60V Fault-Protected, 10Mbps, Fail-Safe RS-485/J1708 Transceivers

19-2666; Rev 0; 10/02
±15kV ESD-Protected, ±60V Fault-Protected,
10Mbps, Fail-Safe RS-485/J1708 Transceivers
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
o ±15kV ESD Protection
o ±60V Fault Protection
o Guaranteed 10Mbps Data Rate
(MAX3441E/MAX3443E)
o Hot Swappable for Telecom Applications
o True Fail-Safe Receiver Inputs
o Enhanced Slew-Rate-Limiting Facilitates
Error-Free Data Transmission
(MAX3440E/MAX3442E/MAX3444E)
o Allow Up to 128 Transceivers on the Bus
o -7V to +12V Common-Mode Input Range
o Automotive Temperature Range (-40°C to +125°C)
o Industry-Standard Pinout
Ordering Information
PART
MAX3440EESA
MAX3440EEPA
MAX3440EASA
MAX3440EAPA
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
-40°C to +125°C
-40°C to +125°C
PIN-PACKAGE
8 SO
8 PDIP
8 SO
8 PDIP
Ordering Information continued at end of data sheet.
Selector Guide
PART
MAX3440E
MAX3441E
MAX3442E
MAX3443E
MAX3444E
TYPE
RS-485
RS-485
RS-485
RS-485
J1708
DATA RATE
(Mbps)
0.25
2.5 to 10
0.25
2.5 to 10
0.25
LOW-POWER
SHUTDOWN
No
No
Yes
Yes
Yes
RECEIVER/DRIVER
ENABLE
Yes
Yes
Yes
Yes
Yes
TRANSCEIVERS
ON BUS
128
128
128
128
128
HOT SWAP
Yes
Yes
Yes
Yes
Yes (only RE)
Pin Configurations and Typical Operating Circuits
TOP VIEW
FAULT ₁
RO 2
R
DE/RE 3
DI 4 D
8 VCC ^FAULT 1
7B
RO 2
R
6 ^{A DE/RE 3}
5 GND DI ⁴ D
8 V_CC
7B
Rt
6
A
5 GND
MAX3440E
MAX3441E
DIP/SO
DIP/SO
Pin Configurations and Typical Operating Circuits continued at end of data sheet.
B
Rt
A
DE/RE
D
DI
R
RO
FAULT
________________________________________________________________ Maxim Integrated Products 1
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