MAX13442E_11 Datasheet, PDF (1/18 Pages) Maxim Integrated Products – ±15kV ESD-Protected, ±80V Fault-Protected, Fail-Safe RS-485/J1708 Transceivers

19-3898; Rev 3; 3/11
±15kV ESD-Protected, ±80V Fault-Protected,
Fail-Safe RS-485/J1708 Transceivers
General Description
The MAX13442E/MAX13444E are fault-protected RS-485
and J1708 transceivers that feature ±80V protection from
signal faults on communication bus lines. The
MAX13442E/MAX13444E feature a reduced slew-rate dri-
ver that minimizes EMI and reflections, allowing error-free
transmission up to 250kbps. The MAX13443E driver can
transmit up to 10Mbps. The high-speed MAX13443E
RS-485 tranceiver features ±60V protection from signal
faults on communication bus lines. These transceivers fea-
ture foldback current limit. Each device contains one dif-
ferential 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. True fail-safe inputs guarantee a logic-high receiv-
er 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 MAX13442E/MAX13443E/MAX13444E are avail-
able in an 8-pin SO package and are specified over the
automotive temperature range.
Applications
RS-422/RS-485
Communications
Telecommunications
Systems
Truck and Trailer
Applications
Industrial Networks
Automotive Applications
HVAC Controls
Features
♦ ±15kV ESD Protection
♦ ±80V Fault Protection (±60V MAX13443E)
♦ Guaranteed 10Mbps Data Rate (MAX13443E)
♦ Hot-Swappable for Telecom Applications
♦ True Fail-Safe Receiver Inputs
♦ Enhanced Slew-Rate-Limiting Facilitates
Error-Free Data Transmission
(MAX13442E/MAX13444E)
♦ Allow Up to 128 Transceivers on the Bus
♦ -7V to +12V Common-Mode Input Range
♦ ±6mA FoldBack Current Limit
♦ Industry-Standard Pinout
Ordering Information
PART
TEMP RANGE PIN-PACKAGE
MAX13442EASA+
-40°C to +125°C 8 SO
MAX13443EASA+
-40°C to +125°C 8 SO
MAX13444EASA/V+T -40°C to +125°C 8 SO
+Denotes a lead(Pb)-free/RoHS-compliant package.
/V denotes an automotive qualified part.
T = Tape and reel.
Selector Guide
PART
TYPE
DATA RATE
(Mbps)
FAULT
PROTECTION
(V)
LOW-POWER RECEIVER/DRIVER TRANSCEIVERS
SHUTDOWN
ENABLE
ON BUS
HOT SWAP
MAX13442E RS-485
0.25
±80
Yes
Yes
MAX13443E RS-485
10
±60
Yes
Yes
MAX13444E J1708
0.25
±80
Yes
Yes
128
Yes
128
Yes
128
Yes (only RE)
Pin Configurations and Typical Operating Circuits
TOP VIEW
+
RO ₁
R
RE 2
DE 3
DI 4 D
8 VCC
7B
6A
5 GND
+
RO 1
R
RE 2
DE 3
DI 4 D
DE
MAX13442E
8 V_CC
MAX13443E
D
DI
7B
B
R_T
R_T
6
A
5 GND
A
R
RO
SO
SO
RE
Pin Configurations and Typical Operating Circuits continued at end of data sheet.
________________________________________________________________ Maxim Integrated Products 1
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