OC

CD

Q

LH

H

L

LHL

H

LL

X

Q0

HX

X

Z

OC

CD

Q

LH

H

H

LHL

L

LL

X

Q0

HX

X

Z

INPUTS

OUTPUT

INPUTS

OUTPUT

’ALS841, ’AS841

’ALS842, ’AS842

SN54ALS841, SN54AS841, SN54ALS842, SN54AS842

SN74ALS841, SN74AS841, SN74ALS842, SN74AS842

10-BIT BUS INTERFACE D-TYPE LATCHES WITH 3-STATE OUTPUTS

SDAS059B – D2910, DECEMBER 1983 – REVISED MAY 1986

POST OFFICE BOX 655303

2

description (continued)

A buffered output control (OC) input can be used to place the ten outputs in either a normal logic state (high or

low levels) or a high-impedance state. In the high-impedance state, the outputs neither load nor drive the bus

lines significantly. The high-impedance state and increased drive provide the capability to drive the bus lines

in a bus-organized system without need for interface or pullup components.

The output control does not affect the internal operation of the latches. Old data can be retained or new data

can be entered while the outputs are off.

The - 1 versions of the SN74ALS841 and SN74ALS842 parts are identical to the standard versions except that

SN54ALS842.

The SN54ALS841, SN54AS841, SN54ALS842, and SN54AS842 are characterized for operation over the full

military temperature range of – 55

°C to 125°C. The SN74ALS841, SN74AS841, SN74ALS842, and

SN74AS842 are characterized for operation from 0

°C to 70°C.

Function Tables