Details, datasheet, quote on part number: SN74LS251N
CategoryLogic => Multiplexers/Demultiplexers => Multiplexers
Description8-Input Multiplexer With 3-State Output, Package: Soic, Pins=16
CompanyON Semiconductor
DatasheetDownload SN74LS251N datasheet
Cross ref.Similar parts: JM38510/30905BEA, CD54ACT151, CD54HCT151, CD54HCT251, CD74HCT151, CD74HCT251, SN54ALS151, SN54ALS251, SN54LS151
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Features, Applications

The TTL/MSI 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. The LS251 can be used as a universal function generator to generate any logic function of four variables. Both assertion and negation outputs are provided.

Schottky Process for High Speed Multifunction Capability On-Chip Select Logic Decoding Inverting and Non-Inverting 3-State Outputs Input Clamp Diodes Limit High Speed Termination Effects

Symbol VCC TA IOH IOL Parameter Supply Voltage Operating Ambient Temperature Range Output Current ­ High Output Current ­ Low Min 4.75 0 Typ 5.0 25 Max Unit °C mA

LOADING (Note a) PIN NAMES I7 Z Select Inputs Output Enable (Active LOW) Inputs Multiplexer Inputs Multiplexer Output Complementary Multiplexer Output HIGH 0.5 U.L. 0.5 U.L. 0.5 U.L. 65 U.L. 65 U.L. LOW 0.25 U.L. 0.25 U.L. 0.25 U.L. 15 U.L. 15 U.L.

The is a logical implementation of a single pole, 8-position switch with the switch position controlled by the state of three Select inputs, S1, S2. Both assertion and negation outputs are provided. The Output Enable input (EO) is active LOW. When it is activated, the logic function provided at the output is:

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 to 128 devices together. When the outputs of the 3-state devices are tied together, all but one device must be in the high impedance state to avoid high currents that would exceed the maximum ratings. The Output Enable signals should be designed to ensure there is no overlap in the active LOW portion of the enable voltage.

H = HIGH Voltage Level L = LOW Voltage Level X = Don't Care (Z) = High impedance (Off)


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