SN55110A, SN75110A, SN75112

DUAL LINE DRIVERS

SLLS106G − DECEMBER 1975 − REVISED NOVEMBER 2004

2

POST OFFICE BOX 655303

description/ordering information (continued)

These drivers feature independent channels with common voltage supply and ground terminals. The significant

difference between the three drivers is in the output-current specification. The driver circuits feature a constant

output current that is switched to either of two output terminals by the appropriate logic levels at the input

terminals. The output current can be switched off (inhibited) by low logic levels on the enable inputs. The output

current nominally is 12 mA for the ’110A devices and is 27 mA for the SN75112.

The enable/inhibit feature is provided so the circuits can be used in party-line or data-bus applications. A strobe

or inhibitor (enable D), common to both drivers, is included for increased driver-logic versatility. The output

in a party-line system with other drivers. The output impedance of the driver in the inhibited mode is very high.

The output impedance of a transistor is biased to cutoff.

The driver outputs have a common-mode voltage range of −3 V to 10 V, allowing common-mode voltage on the

line without affecting driver performance.

All inputs are diode clamped and are designed to satisfy TTL-system requirements. The inputs are tested at

2 V for high-logic-level input conditions and 0.8 V for low-logic-level input conditions. These tests ensure

400-mV noise margin when interfaced with TTL Series 54/74 devices.

The SN55110A is characterized for operation over the full military temperature range of −55

°C to 125°C. The

SN75110A and SN75112 are characterized for operation from 0

°C to 70°C.

FUNCTION TABLE

(each driver)

LOGIC

INPUTS

ENABLE

INPUTS

OUTPUTS†

A

B

C

D

Y

Z

X

X

L

X

Off

Off

X

XX

LOff

Off

L

XH

HOn

Off

X

LH

HOn

Off

H

H

H

H

Off

On

H = high level, L = low level, X = irrelevant

† When using only one channel of the line drivers,

the other channel should be inhibited and/or have

its outputs grounded.