3

FN7529.1

March 14, 2013

Pin Descriptions

ISL32173E,

ISL32273E

PIN NUMBER

ISL32175E,

ISL32275E

PIN NUMBER

ISL32177E,

ISL32277E

PIN NUMBER

PIN

FUNCTION

4, 12

-

4, 15

EN, EN

Group driver output enables, that are internally pulled high to

low, and the outputs are all high impedance when EN is low AND

EN is high (i.e., if using only the active high EN, connect EN to

connect EN directly to GND). If the group enable function isn’t

resistor, or connect EN directly to GND. (ISL32X73E and

ISL32X77E only)

-

4, 12

-

EN12, EN34 Paired driver output enables, that are internally pulled high to

(3 and 4) RO outputs. Driving EN12 (EN34) low disables the

channel 1 and 2 (3 and 4) outputs. If the enable function isn’t

or greater resistor. (ISL32X75E only).

-

-

2, 3,

16, 17

EN1, EN2,

EN3, EN4

Individual receiver output enables that are internally pulled high

the channel X output (ROX). Driving ENX low disables the

channel X output, regardless of the states of EN and EN. If the

individual channel enable function isn’t required, connect ENX to

-

-

9

SHDNEN

Low power SHDN mode enable that is internally pulled high to

mode when all channels are disabled. A low level prevents the

device from entering the low power mode. (ISL32X77E only)

3, 5,

11, 13

3, 5,

11, 13

1, 6,

13, 18

RO1, RO2,

RO3, RO4

Channel X receiver output: If A - B ≥ 200mV, RO is high;

If A - B ≤ -200mV, RO is low. RO = High if A and B are unconnected

(floating).

8

8

10, PAD

GND

Ground connection. This is also the potential of the QFN thermal

pad.

2, 6,

10, 14

2, 6,

10, 14

24, 7,

12, 19

A1, A2,

A3, A4

±16.5kV IEC61000-4-2 ESD Protected RS-485/422 level,

channel X noninverting receiver input.

1, 7,

9, 15

1, 7,

9, 15

23, 8,

11, 20

B1, B2,

B3, B4

±16.5kV IEC61000-4-2 ESD Protected RS-485/422 level,

channel X inverting receiver input.

16

16

22

--

21

supply of a logic device (e.g., UART or µcontroller) interfacing

minimize input current and SHDN supply current, logic pins that

are strapped high externally (preferably through a 1kΩ resistor)

(ISL32X77E only)

-

-

5, 14

NC

No Connection.

ISL32173E, ISL32175E, ISL32177E, ISL32273E, ISL32275E, ISL32277E