MAX3440E

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 to +125)
`Industry-Standard Pinout


Application

·RS-422/RS-485 Communications
·Truck and Trailer Applications
·Industrial Networks
·Telecommunications Systems
·Automotive Applications
·HVAC Controls


Pinout




Specifications

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
8-Pin SO (derate 5.9mW/ above +70).....................471mW
8-Pin PDIP (derate 9.09mW/ above +70)................727mW
Operating Temperature Ranges
MAX344_EE_ _ ..................................................-40 to +85
MAX344_EA_ _ ................................................-40 to +125
Storage Temperature Range ...........................-65 to +150
Junction Temperature....................................................+150
Lead Temperature (soldering, 10s) ...............................+300


Description

The MAX3440EMAX3444E 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-unitload receiver input impedance allows up to 128 transceivers 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 of the MAX3440E on the data bus during circuit initialization or connection to a live backplane. Short-circuit current-limiting and thermal shutdown circuitry protect the driver against excessive power dissipation, and on-chip ±15kV ESD protection eliminates costly external protection devices.

The MAX3440EMAX3444E are available in 8-pin SO and PDIP packages and are specified over industrial and automotive temperature ranges.