IN74AC257
TECHNICAL DATA
Quad 2-Input Data Selector/Multiplexer with 3-State Outputs
High-Speed Silicon-Gate CMOS
The IN74AC257 is identical in pinout to the LS/ALS257, HC/HCT257. The device inputs are patible with standard CMOS outputs; with pullup resistors, they are patible with LS/ALS outputs. This device selects a (4-bit) nibble from either the A or B inputs as determined by the Select input. The nibble is presented at the outputs in noninverted from when the Output Enable pin is at a low level. A high level on the Output Enable pin switches the outputs into the highimpedance state.
- Outputs Directly Interface to CMOS, NMOS, and TTL
- Operating Voltage Range: 2.0 to 6.0 V
- Low Input Current: 1.0 µA; 0.1 µA @ 25°C
- High Noise Immunity Characteristic of CMOS Devices
- Output Source/Sink 24 m A
ORDERING INFORMATION IN74AC257N Plastic IN74AC257D SOIC TA = -40° to 85° C for all packages
PIN ASSIGNMENT
LOGIC DIAGRAM
FUNCTION TABLE
Inputs Output Enable H L L PIN 16 =VCC PIN 8 =...
