器件名称: SN74ALS157A
功能描述: QUADRUPLE 1-OF-2 DATA SELECTORS/MULTIPLEXERS
文件大小: 725.82KB 共20页
简 介:SN54ALS157A, SN54ALS158 SN74ALS157A, SN74ALS158, SN74AS157, SN74AS158 QUADRUPLE 1OF2 DATA SELECTORS/MULTIPLEXERS
Buffered Inputs and Outputs Package Options Include Plastic Small-Outline (D) Packages, Ceramic Chip Carriers (FK), and Standard Plastic (N) and Ceramic (J) 300-mil DIPs
SN54ALS157A, SN54ALS158 . . . J PACKAGE SN74ALS157A, SN74ALS158, SN74AS157, SN74AS158 . . . D OR N PACKAGE (TOP VIEW)
SDAS081C APRIL 1982 REVISED DECEMBER 1994
description
These data selectors/multiplexers contain inverters and drivers to supply full data selection to the four output gates. A separate strobe (G) input is provided. A 4-bit word is selected from one of two sources and is routed to the four outputs. The ′ALS157A and SN74AS157 present true data. The ′ALS158 and SN74AS158 present inverted data to minimize propagation delay time. The SN54ALS157A and SN54ALS158 are characterized for operation over the full military temperature range of 55°C to 125°C. The SN74ALS157A, SN74ALS158, SN74AS157, and SN74AS158 are characterized for operation from 0°C to 70°C.
A /B 1A 1B 1Y 2A 2B 2Y GND
1 2 3 4 5 6 7 8
16 15 14 13 12 11 10 9
VCC G 4A 4B 4Y 3A 3B 3Y
SN54ALS157A, SN54ALS158 . . . FK PACKAGE (TOP VIEW)
1A A/B NC VCC
3 4 5 6 7 8
1B 1Y NC 2A 2B
2 1 20 19 18 17 16 15
G 4A 4B NC 4Y 3A
14 9 10 11 12 13
NC No internal connection FUNCTION TABLE INPUTS DATA G H L L L L A /B X L L H H A X L H X X B X X X L H OUTPUT Y ′ALS157A SN74AS157 L L H L H ′ALS158 SN74AS158 H H L H L
PRODUCTION DATA……
