IN74ACT257 Datasheet, PDF (1/5 Pages) Integral Corp. – QUAD 2-INPUT DATA SELECTOR/MULTIPLEXER WITH 3-STATE OUTPUTS

IN74ACT257
QUAD 2-INPUT DATA SELECTOR/MULTIPLEXER
WITH 3-STATE OUTPUTS
High-Speed Silicon-Gate CMOS
The IN74ACT257 is identical in pinout to the LS/ALS257,
HC/HCT257. The IN74ACT257 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 noninverted 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
LOGIC DIAGRAM
ORDERING INFORMATION
IN74ACT257N Plastic
IN74ACT257D SOIC
T_A = -40° to 85° C for all
packages
PIN ASSIGNMENT
PIN 16 =V_CC
PIN 8 = GND
FUNCTION TABLE
Inputs
Outputs
Output
Select Y0-Y3
Enable
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
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