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MC74ACT251

Motorola
Part Number MC74ACT251
Manufacturer Motorola
Description 8-Input Multiplexer
Published Apr 15, 2006
Detailed Description ( DataSheet : www.DataSheet4U.com ) MC74AC251 MC74ACT251 8ĆInput Multiplexer with 3ĆState Outputs The MC74AC251/74ACT25...
Datasheet PDF File MC74ACT251 PDF File

MC74ACT251
MC74ACT251

Overview
( DataSheet : www.
DataSheet4U.
com ) MC74AC251 MC74ACT251 8ĆInput Multiplexer with 3ĆState Outputs The MC74AC251/74ACT251 is a high-speed 8-input digital multiplexer.
It provides, in one package, the ability to select one bit of data from up to eight sources.
It can be used as a universal function generator to generate any logic function of four variables.
Both true and complementary outputs are provided.
• • • • • Multifunctional Capability On-Chip Select Logic Decoding Inverting and Noninverting 3-State Outputs Outputs Source/Sink 24 mA ′ACT251 Has TTL Compatible Inputs VCC 16 I4 15 I5 14 I6 13 I7 12 S0 11 S1 10 S2 9 N SUFFIX CASE 648-08 PLASTIC 8-INPUT MULTIPLEXER WITH 3-STATE OUTPUTS 1 I3 2 I2 3 I1 4 I0 5 Z 6 Z 7 OE 8 GND D SUFFIX CASE 751B-05 PLASTIC PIN NAMES S0–S2 OE I0–I7 Z Z Select Inputs 3-State Output Enable Input Multiplexer Inputs 3-State Multiplexer Output Complementary 3-State Multiplexer Output LOGIC SYMBOL S0 OE I0 I1 I2 I3 I4 I5 I6 I7 S1 S2 Z Z TRUTH TABLE Inputs OE H L L L L L L L L S2 X L L L L H H H H S1 X L L H H L L H H S0 X L H L H L H L H Outputs Z Z I0 I1 I2 I3 I4 I5 I6 I7 Z Z I0 I1 I2 I3 I4 I5 I6 I7 H = HIGH Voltage Level L = LOW Voltage Level X = Immaterial Z = High Impedance www.
DataSheet4U.
com www.
DataSheet4U.
com FACT DATA 5-1 MC74AC251 MC74ACT251 FUNCTIONAL DESCRIPTION This device is a logical implementation of a single-pole, 8-position switch with the switch position controlled by the state of three Select inputs, S0, S1, S2.
Both true and complementary outputs are provided.
The Output Enable input (OE) is active LOW.
When it is activated, the logic function provided at the output is: Z = OE•(I0•S0•S1•S2+I1•S0•S1•S2+ I2•S0•S1•S2+I3•S0•S1•S2+ I4•S0•S1•S2+I5•S0•S1•S2+ I6•S0•S1•S2+I7•S0•S1•S2) When the Output Enable is HIGH, both outputs are in the high impedance (High Z) state.
This feature allows multiplexer expansion by tying the outputs of up to 128 devices together.
When the outputs of the 3-state devices are tied...


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