SN74F257
SN74F257 is Quadruple 2-Line To 1-Line Data Selectors/Multiplexers manufactured by Texas Instruments.
SN54F257, SN74F257 QUADRUPLE 2ĆLINE TO 1ĆLINE DATA SELECTORS/MULTIPLEXERS
WITH 3ĆSTATE OUTPUTS
SDFS065A
- D2932, MARCH 1987
- REVISED OCTOBER 1993
- 3-State Outputs Interface Directly With
System Bus
- Provides Bus Interface From Multiple
Sources in High-Performance Systems
- Package Options Include Plastic
Small-Outline Packages, Ceramic Chip Carriers, and Standard Plastic and Ceramic 300-mil DIPs description
The ′F257 is designed to multiplex signals from 4-bit data sources to 4-output data lines in bus-organized systems. The 3-state outputs will not load the data lines when the output enable (OE) input is at a high logic level.
SN54F257 . . . J PACKAGE SN74F257 . . . D OR N PACKAGE
(TOP VIEW)
A /B 1 1A 2 1B 3 1Y 4 2A 5 2B 6 2Y 7 GND 8
16 VCC 15 OE 14 4A 13 4B 12 4Y 11 3A 10 3B 9 3Y
SN54F257 . . . FK PACKAGE (TOP VIEW)
1A A/B NC VCC OE
The SN54F257 is characterized for operation over the full military temperature range of
- 55°C to 125°C. The SN74F257 is characterized for operation from 0°C to 70°C.
FUNCTION TABLE
INPUTS OE A /B A
OUTPUT
1B
3 2 1 20 19
4A
1Y 5
17 4B
NC 6
16...
