CD74HCT42E屬于集成電路（IC）的信號開關(guān)多路復(fù)用器解碼器。由美國德州儀器公司制造生產(chǎn)的CD74HCT42E信號開關(guān)，多路復(fù)用器，解碼器邏輯型信號開關(guān)、多路復(fù)用器和編碼器 IC 可用于對以數(shù)字格式表示數(shù)據(jù)的電信號進(jìn)行路由和選擇。這些器件與設(shè)計用于模擬信號的類似產(chǎn)品有所不同，它們保留的信息表示為兩個電狀態(tài)之一，而不是兩個外部界限內(nèi)的無窮變化量。

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).