特性 Features

? Buffered Inputs and Outputs

? Typical Propagation Delay: 12ns at VCC = 5V,

CL = 15pF, TA = 25oC

? 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 ’HC42 and CD74HCT42 BCD-to-Decimal Decoders

utilize silicon-gate CMOS technology to achieve operating

speeds similar to LSTTL decoders with the low power

consumption of standard CMOS integrated circuits. These

devices have the capability of driving 10 LSTLL loads and

are compatible with the standard LS logic family. One of ten

outputs (low on select) is selected in accordance with the

BCD input. Non-valid BCD inputs result in none of the

outputs being selected (all outputs are high).