Datasheet Texas Instruments SN74F257DR — 数据表


      



 
 
SDFS065A -D2932, MARCH 1987 -REVISED OCTOBER 1993 SN54F257 . J PACKAGE
SN74F257 . D OR N PACKAGE
(TOP VIEW) 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 A /B
1A
1B
1Y
2A
2B
2Y
GND 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. X X Z L X L L H X H L H X L L L H X H H A /B A H X L L L 3 14 4 13 5 12 6 11 7 10 8 9 VCC …