LT8610AX datasheet(8/18 Pages) AD

8 / 18 page

LTC2879X

Rev 0

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PIN FUNCTIONS

RO (Pin 1): Receiver Output. If the receiver is enabled

(RE low) and A–B > 200mV, then RO will be high. If

A–B < –200mV, then RO will be low. If the receiver inputs

are open, shorted, or terminated without being driven for

more than about 1.5µs, RO will be high. Integrated 250k

pull-up resistor to supply.

RE (Pin 2): Receiver Enable. A low input enables the

receiver. A high input forces the receiver output into a

high impedance state. If RE is high with DE low, the device

enters a low power shutdown state. Integrated 500k pull-

up resistor to supply.

DE (Pin 3): Driver Enable. A high input on DE enables the

driver. A low input forces the driver outputs into a high

impedance state. If DE is low with RE high, the device

enters a low power shutdown state. Integrated 500k pull-

down resistor to ground.

DI (Pin 4): Driver Input. If the driver outputs are enabled

(DE high), then a low on DI drives a negative differential

voltage between A and B. A high on DI, with the driver out-

puts enabled, drives a positive differential voltage between

A and B. Integrated 500k pull-up resistor to supply.

GND (Pin 5, 9): Ground

A (Pin 6): Non-Inverting Receiver Input and Non-Inverting

Driver Output. For use in a PROFIBUS network, connect

this to the B wire (red, positive).

B (Pin 7): Inverting Receiver Input and Inverting Driver

Output. For use in a PROFIBUS network, connect this to

the A wire (green, negative).

VCC (Pin 8): Power Supply. 3.0V ≤ VCC ≤ 5.5V. Bypass

with a 0.1µF ceramic capacitor to GND.

Exposed Pad (Pin 9): Must be connected to GND.

BLOCK DIAGRAM

LTC2879X

VCC

GND

3V TO 5.5V

VCC

MODE

CONTROL

DRIVER

RECEIVER

2879X BD

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