1 Features
• Operating voltage range of 4.5 V to 5.5 V
• High-current3-state outputs interface directly with
system bus
• Typical tpd = 17 ns
• Low power consumption, 80-μA max ICC
• ±6-mA output drive at 5 V
• Low input current of 1 μA max
• Inputs are TTL-voltage compatible
• Provide bus interface from multiple sources in
high-performance systems
• Buffered inputs and outputs

2 Description
The ’HCT257 devices are designed to multiplex
signals from 4-bit data sources to 4-output data lines
in bus-organized systems.