SN54HCT257, SN74HCT257
QUADRUPLE 2-LINE TO 1-LINE DATA SELECTORS/MULTIPLEXERS
WITH 3-STATE OUTPUTS

SCLS072B - NOVEMBER 1988 - REVISED MAY 1997

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features

• Inputs Are TTL-Voltage Compatible
• Provide Bus Interface From Multiple Sources in High-Performance Systems
• High-Current 3-State Outputs Interface Directly With System Bus
• Buffered Inputs and Outputs
• Package Options Include Ceramic Chip Carriers (FK) and Standard Plastic (N) and Ceramic (J) 300-mil DIPs

   

description

The 'HCT257 are designed to multiplex signals from 4-bit data sources to 4-output data lines in bus-organized systems. The 3-state outputs do not load the data lines when the output-enable () input is at the high logic level.

The SN54HCT257 is characterized for operation over the full military temperature range of -55°C to 125°C. The SN74HCT257 is characterized for operation from -40°C to 85°C.