1 Features
• Wide operating voltage range of 2 V to 6 V
• High-current inverting outputs can drive up to 15
LSTTL loads
• Low power consumption, 80-μA max ICC
• 'HC257 typical tpd = 9 ns
• 'HC258 typical tpd = 12 ns
• ±6-mA output drive at 5 V
• Low input current of 1 μA max
• Provides bus interface from multiple sources in
high-performance systems

2 Description
The SNx4HC257 and '258 contain four data selectors/
multiplexers to select one of two data sources. All
channels are controlled by the same address select
(A/B) input, and active-low strobe (G) input. A high
level at the G terminal forces all outputs into the highimpedance
state. The '257 has non-inverted outputs
and the '258 has inverted outputs.