LTC2876 datasheet(9/32 Pages) LINER

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LTC2876/LTC2877

28767fa

For more information www.linear.com/LTC2876

pin FuncTions

RO (Pin 1): Receiver Output. Supplied by VCC in the

LTC2876 or VL in the LTC2877. If the receiver is enabled

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

PB–PA<–200mV,thenROwillbelow.Ifthereceiverinputs

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(Pin2):ReceiverEnable.LogiclevelsdefinedbytheVCC

supply in the LTC2876 or the VL supply in the LTC2877.

A low input enables the receiver. A high input forces the

receiver output into a high impedance state. If RE is high

withDElow,thedeviceentersalowpowershutdownstate.

Integrated 500k pull-up resistor to supply.

DE (Pin 3): Driver Enable. Logic levels defined by the VCC

supply in the LTC2876 or the VL supply in the LTC2877.

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. Logic levels defined by the VCC

supply in the LTC2876 or the VL supply in the LTC2877.

If the driver outputs are enabled (DE high), then a low on

DI drives a negative differential voltage between PB and

PA. A high on DI, with the driver outputs enabled, drives a

positivedifferentialvoltagebetweenPBandPA.Integrated

500k pull-up resistor to supply.

VL (NA/Pin 5): Logic supply: 1.65V ≤ VL ≤ VCC. Powers

RO, RE, DE, and DI on LTC2877 only. Bypass with 0.1µF

ceramic capacitor to GND.

GND (Pin 5, 9/Pin 6,11): Ground

NC (NA/Pin 7): Not Internally Connected.

PB (Pin 6/Pin 8): PROFIBUS B. Non-inverting receiver

input and non-inverting driver output. Connect this to

the B wire (positive) in a PROFIBUS network. In most

non-PROFIBUS applications, this should connect to the

A terminal. See the Applications Information section for

more information on A vs B naming conventions.

PA (Pin 7/Pin 9): PROFIBUS A. Inverting receiver input

and inverting driver output. Connect this to the A wire

(negative)inaPROFIBUSnetwork.Inmostnon-PROFIBUS

applications, this should connect to the B terminal. See

the Applications Information section for more information

on A vs B naming conventions.

VCC (Pin 8/Pin 10): Power Supply. 4.5V ≤ VCC ≤ 5.5V for

PROFIBUS and RS485 compliant applications; 3.0V ≤ VCC

≤ 5.5V for a wide range of usage. See 3.3V Operation in

the Applications Information section for details. Bypass

with 1µF ceramic capacitor to GND.

Exposed Pad (Pin 9/Pin 11): Must be connected to GND.

(LTC2876/LTC2877)

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