TECHNICAL DATA

IN74ACT258

Quad 2-Input Data Selector/Multiplexer

with 3-State Outputs

High-Speed Silicon-Gate CMOS

ORDERING INFORMATION

IN74ACT258N Plastic

IN74ACT258D SOIC

The IN74ACT258 is identical in pinout to the LS/ALS258,

HC/HCT258. The IN74ACT258 may be used as a level converter for

interfacing TTL or NMOS outputs to High Speed CMOS inputs.

This device selects a (4-bit) nibble from either the A or B inputs as

determined by the Select input. The nibble is presented at the outputs in

inverted from when the Output Enable pin is at a low level. A high level

on the Output Enable pin switches the outputs into the high-impedance

state.

• TTL/NMOS Compatible Input Levels

• Outputs Directly Interface to CMOS, NMOS, and TTL

• Operating Voltage Range: 4.5 to 5.5 V

• Low Input Current: 1.0 µA; 0.1 µA @ 25°C

• Outputs Source/Sink 24 mA

FUNCTION TABLE

Inputs

Outputs

Output

Enable

Select

Y0-Y3

H

X

Z

L

L

A0-A3

L

H

B0-B3

X=don’t care

Z = high-impedance state

A0-A3,B0-B3=the levels of the respective

Nibble Inputs

PIN ASSIGNMENT

LOGIC DIAGRAM

PIN 8 = GND

Rev. 00