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IN74HC257N Datasheet(PDF) 1 Page - Integral Corp.

Part # IN74HC257N
Description  Quad 2-Input Data Selector/Multiplexer with 3-State Outputs High-Performance Silicon-Gate CMOS
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Manufacturer  INTEGRAL [Integral Corp.]
Direct Link  http://www.iksemi.com/
Logo INTEGRAL - Integral Corp.

IN74HC257N Datasheet(HTML) 1 Page - Integral Corp.

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TECHNICAL DATA
321
Quad 2-Input Data Selector/Multiplexer
with 3-State Outputs
High-Performance Silicon-Gate CMOS
The IN74HC257 is identical in pinout to the LS/ALS257. The
device inputs are compatible with standard CMOS outputs; with pullup
resistors, they are compatible with LS/ALSTTL outputs.
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.
• Outputs Directly Interface to CMOS, NMOS, and TTL
• Operating Voltage Range: 2.0 to 6.0 V
• Low Input Current: 1.0 µA
• High Noise Immunity Characteristic of CMOS Devices
IN74HC257
ORDERING INFORMATION
IN74HC257N Plastic
IN74HC257D SOIC
TA = -55° to 125° C for all packages
FUNCTION TABLE
Inputs
Outputs
Output
Enable
Select
Y0-Y3
HX
Z
LL
A0-A3
LH
B0-B3
X=don’t care
Z = high-impedance state
A0-A3,B0-B3=the levels of the respective
Nibble Inputs
LOGIC DIAGRAM
PIN 16 =VCC
PIN 8 = GND
PIN ASSIGNMENT


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