特性 Features

? Two Enable Inputs to Facilitate Demultiplexing and

Cascading Functions

? Fanout (Over Temperature Range)

- Standard Outputs . . . . . . . . . . . . . . . 10 LSTTL Loads

- Bus Driver Outputs . . . . . . . . . . . . . 15 LSTTL Loads

? Wide Operating Temperature Range . . . -55oC to 125oC

? Balanced Propagation Delay and Transition Times

? Significant Power Reduction Compared to LSTTL

Logic ICs

? HC Types

- 2V to 6V Operation

- High Noise Immunity: NIL = 30%, NIH = 30%of VCC at

VCC = 5V

? HCT Types

- 4.5V to 5.5V Operation

- Direct LSTTL Input Logic Compatibility,

VIL= 0.8V (Max), VIH = 2V (Min)

- CMOS Input Compatibility, Il ≤ 1μA at VOL, VOH

描述 Description

The ’HC154 and ’HCT154 are 4- to 16-line

decoders/demultiplexers with two enable inputs, E1 and E2.

A High on either enable input forces the output into the High

state. The demultiplexing function is performed by using the

four input lines, A0 to A3, to select the output lines Y0 to

Y15, and using one enable as the data input while holding

the other enable low.