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MC74ACT257

Motorola
Part Number MC74ACT257
Manufacturer Motorola
Description QUAD 2-INPUT MULTIPLEXER
Published Apr 15, 2006
Detailed Description ( DataSheet : www.DataSheet4U.com ) MC74AC257 MC74ACT257 Quad 2ĆInput Multiplexer with 3ĆState Outputs The MC74AC257/74...
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MC74ACT257
MC74ACT257

Overview
( DataSheet : www.
DataSheet4U.
com ) MC74AC257 MC74ACT257 Quad 2ĆInput Multiplexer with 3ĆState Outputs The MC74AC257/74ACT257 is a quad 2-input multiplexer with 3-state outputs.
Four bits of data from two sources can be selected using a Common Data Select input.
The four outputs present the selected data in true (noninverted) form.
The outputs may be switched to a high impedance state by placing a logic HIGH on the common Output Enable (OE) input, allowing the outputs to interface directly with bus-oriented systems.
• • • • Multiplexer Expansion by Tying Outputs Together Noninverting 3-State Outputs Outputs Source/Sink 24 mA ′ACT257 Has TTL Compatible Inputs VCC 16 OE 15 I0c 14 I1c 13 Zc 12 I0d 11 I1d 10 Zd 9 QUAD 2-INPUT MULTIPLEXER WITH 3-STATE OUTPUTS N SUFFIX CASE 648-08 PLASTIC PIN NAMES S OE I0a–I0d I1a–I1d Za–Zd Common Data Select Input 3-State Output Enable Input Data Inputs from Source 0 Data Inputs from Source 1 3-State Multiplexer Outputs D SUFFIX CASE 751B-05 PLASTIC 1 S 2 I0a 3 I1a 4 Za 5 I0b 6 I1b 7 Zb 8 GND TRUTH TABLE Output Enable OE H L L L L H = HIGH Voltage Level L = LOW Voltage Level X = Immaterial Z = High Impedance LOGIC SYMBOL Select Input S X H H L L Data Inputs I0 X X X L H I1 X L H X X Outputs Z Z L H L H S Za Zb Zc Zd OE I0a I1a I0b I1b I0c I1c I0d I1d www.
DataSheet4U.
com www.
DataSheet4U.
com FACT DATA 5-1 MC74AC257 MC74ACT257 FUNCTIONAL DESCRIPTION The MC74AC257/74ACT257 is a quad 2-input multiplexer with 3-state outputs.
It selects four bits of data from two sources under control of a Common Data Select input.
When the Select input is LOW, the I0x inputs are selected and when Select is HIGH, the I1x inputs are selected.
The data on the selected inputs appears at the outputs in true (noninverted) form.
The device is the logic implementation of a 4-pole, 2-position switch where the position of the switch is determined by the logic levels supplied to the Select input.
The logic equations for the outputs are shown below: Za...


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