SN74HC257NSR.A中文资料德州仪器数据手册PDF规格书

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.