CD74HCT138中文資料高速 CMOS 邏輯 3 至 8 線路解碼器/多路解復(fù)用器（反向和同向）數(shù)據(jù)手冊(cè)TI規(guī)格書(shū)

描述 Description

The ?HC138, ?HC238, ?HCT138, and ?HCT238 are high speed silicon gate CMOS decoders well suited to memory address decoding or data routing applications. Both circuits feature low power consumption usually associated with CMOS circuitry, yet have speeds comparable to low power Schottky TTL logic. Both circuits have three binary select inputs (A0, A1 and A2). If the device is enabled, these inputs determine which one of the eight normally high outputs of the HC/HCT138 series will go low or which of the normally low outputs of the HC/HCT238 series will go high.

Two active low and one active high enables (E1\\, E2\\, and E3) are provided to ease the cascading of decoders. The decoder?s 8 outputs can drive 10 low power Schottky TTL equivalent loads.

特性 Features

? Select One Of Eight Data Outputs Active Low for 138, Active High for 238
? Three Enable Inputs to Simplify Cascading
? Fanout (Over Temperature Range)
? Bus Driver Outputs . . . . 15 LSTTL Loads
? Wide Operating Temperature Range . . . –55°C to 125°C
? Significant Power Reduction Compared to LSTTL Logic ICs
? 2V to 6V Operation
? HCT Types
? Direct LSTTL Input Logic Compatibility, VIL = 0.8V (Max), VIH = 2V (Min)
? CMOS Input Compatibility, Il 1μA at VOL, VOH

Data sheet acquired from Harris Semiconductor

簡(jiǎn)介

CD74HCT138屬于集成電路（IC）的信號(hào)開(kāi)關(guān)多路復(fù)用器解碼器。由TI制造生產(chǎn)的CD74HCT138信號(hào)開(kāi)關(guān)，多路復(fù)用器，解碼器邏輯型信號(hào)開(kāi)關(guān)、多路復(fù)用器和編碼器 IC 可用于對(duì)以數(shù)字格式表示數(shù)據(jù)的電信號(hào)進(jìn)行路由和選擇。這些器件與設(shè)計(jì)用于模擬信號(hào)的類(lèi)似產(chǎn)品有所不同，它們保留的信息表示為兩個(gè)電狀態(tài)之一，而不是兩個(gè)外部界限內(nèi)的無(wú)窮變化量。