SN74AS850A, SN74AS851B
1 OF 16 DATA SELECTORS/MULTIPLEXERS
WITH 3-STATE OUTPUTS

SDAS154A - D2822, DECEMBER 1983 - REVISED JANUARY 1990

features

• 4-Line to 1-Line Data Selectors/Multiplexers
  That Can Select 1 of 16 Data Inputs Typical Applications:
  Boolean Function Generators
  Parallel-to-Serial Converters
  Data Source Selectors
• Cascadable to n-Bits
• 3-State Bus Driver Outputs
• 'AS850A Offers Clocked Selects; 'AS851B Offers Enable-Controlled Selects
• Has a Master Output Control (G\) for Cascading and individual Output Controls (, GW) for Each Output
• Package Option Includes 600-mil Standard Plastic DIPs
• Dependable Texas Instruments Quality and Reliability

description

These four-line to one-line data selectors/multiplexers provide full binary decoding to select one-of-sixteen data sources with complementary Y and W outputs. The 'AS850A has a clock-controlled select register allowing for a symmetrical presentation of the select inputs to the decoder while the 'AS851B has an enable-controlled select register allowing the user to select and hold one particular data line.

A buffered group of output controls (G\, , GW) can be used to place the two outputs in either a normal logic (high or low logic level) or a high-impedance state. In the high-impedance state, the outputs neither load nor drive the bus lines significantly. The high-impedance third state and increased drive provide the capability to drive the bus lines in a bus-organized system without the need for interface or pullup components.

The output controls do not affect the internal operations of the data selector/multiplexer. New data can be setup while the outputs are in the high-impedance state.

The SN74AS850A and SN74AS851B are characterized for operation from 0°C to 70°C.