LTM2885 datasheet(9/22 Pages) LINER

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LTM2885

2885fa

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LOGIC SIDE

TE (Pin A1): Terminator Enable. A logic high enables a

termination resistor (typically 120Ω) between pins A

and B. Do not float.

DI (Pin A2): 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.

Do not float.

DE (Pin A3): 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. Do not float.

RE (Pin A4): Receiver Enable. A logic low enables the

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

ance state. Do not float.

RO (Pin A5): 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 for more than approximately 3μs, RO is a logic

high. Under the condition of an isolation communication

failure RO is in a high impedance state.

VL (Pin A6): 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 A7): 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. Do not float.

DOUT (Pin B1): 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.

PIN FUNCTIONS

GND (Pins B2-B5): Circuit Ground.

VCC(PinsB6-B7):SupplyVoltage.Recommendedoperat-

ing voltage is 4.5V to 5.5V. Internally bypassed to GND

with 2.2µF.

NC (Pins C1-C7): No Connect. Pins with no internal

connection.

ISOLATED SIDE

NC(PinsR1-R7):NoConnect.Pinswithnointernalconnection.

DIN (Pin S1): General Purpose Isolated Logic Input. Logic

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

logic high on DINwillgeneratealogichighonDOUT.Alogic

low on DIN will generate a logic low on DOUT. Do not float.

GND2 (Pins S2-S7): Isolated Side Circuit Ground. The

pads should be connected to the isolated ground and/or

cable shield.

SLO (Pin T1): 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. Do not float.

Y (Pin T2): Noninverting Driver Output. High impedance

when the driver is disabled.

Z (Pin T3): Inverting Driver Output. High impedance when

the driver is disabled.

B (Pin T4): Inverting Receiver Input. Impedance is > 96kΩ

in all modes, powered and unpowered.

A (Pin T5): Noninverting Receiver Input. Impedance is

> 96kΩ in all modes, powered and unpowered.

VCC2 (Pins T6-T7): Isolated Supply Voltage. Internally

generated from VCC by an isolated DC/DC converter and

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

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