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LTM2881

2881fe

LOGIC SIDE (VCC, VL, GND)

DOUT (Pin A1): General Purpose Logic Output. Logic

output connected through isolation path to DIN. Under

the condition of an isolation communication failure DOUT

is in a high impedance state.

TE (Pin A2): Terminator Enable. A logic high enables a

termination resistor (typically 120Ω) between pins A and B.

DI (Pin A3): Driver Input. If the driver outputs are enabled

(DE high), then a low on DI forces the driver noninverting

output (Y) low and the inverting output (Z) high. A high

on DI, with the driver outputs enabled, forces the driver

noninverting output (Y) high and inverting output (Z) low.

DE (Pin A4): Driver Enable. A logic low disables the driver

leaving the outputs Y and Z in a high impedance state. A

logic high enables the driver.

RE (Pin A5): Receiver Enable. A logic low enables the

receiver output. A logic high disables RO to a high imped-

ance state.

RO (Pin A6): Receiver Output. If the receiver output is

enabled (RE low) and if A – B is > 200mV, RO is a logic

high, if A – B is < –200mV RO is a logic low. If the receiver

inputs are open, shorted, or terminated without a valid

signal, RO will be high. Under the condition of an isolation

communication failure RO is in a high impedance state.

VL (Pin A7): Logic Supply. Interface supply voltage for

pins RO, RE, TE, DI, DE, DOUT, and ON. Recommended

operating voltage is 1.62V to 5.5V. Internally bypassed

to GND with 2.2μF.

ON (Pin A8): Enable. Enables power and data communica-

tion through the isolation barrier. If ON is high the part is

enabled and power and communications are functional

to the isolated side. If ON is low the logic side is held in

reset and the isolated side is unpowered.

GND (Pins B1-B5): Circuit Ground.

VCC(Pins B6-B8): Supply Voltage. Recommended operat-

ing voltage is 3V to 3.6V for LTM2881-3 and 4.5V to 5.5V

for LTM2881-5. Internally bypassed to GND with 2.2μF.

PIN FUNCTIONS

ISOLATED SIDE (VCC2, GND2)

DIN (Pin L1): General Purpose Isolated Logic Input. Logic

input on the isolated side relative to VCC2 and GND2. A

logic high on DIN will generate a logic high on DOUT. A

logic low on DIN will generate a logic low on DOUT.

SLO (Pin L2): Driver Slew Rate Control. A low input, rela-

tive to GND2, will force the driver into a reduced slew rate

mode for reduced EMI. A high input, relative to GND2,

puts the driver into full speed mode to support maximum

data rates.

Y (Pin L3): Non Inverting Driver Output. High impedance

when the driver is disabled.

Z (Pin L4): Inverting Driver Output. High impedance when

the driver is disabled.

B (Pin L5): Inverting Receiver Input. Impedance is > 96kΩ

in receive mode with TE low or unpowered.

A (Pin L6): Non Inverting Receiver Input. Impedance is

> 96kΩ in receive mode with TE low or unpowered.

VCC2 (Pins L7-L8): Isolated Supply Voltage. Internally

generated from VCC by an isolated DC/DC converter and

regulated to 5V. Internally bypassed to GND2 with 2.2μF.

GND2 (Pins K1-K8): Isolated Side Circuit Ground. The

pads should be connected to the isolated ground and/or

cable shield.

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