M74HC4538TTR屬于集成電路（IC）的多諧振蕩器。由意法半導(dǎo)體集團(tuán)制造生產(chǎn)的M74HC4538TTR多諧振蕩器多諧振蕩器是簡(jiǎn)單的雙態(tài)器件，盡管它們的典型使用方式在很大程度上具有模擬特性，但通常被認(rèn)為是數(shù)字邏輯元器件。單穩(wěn)型也稱(chēng)為“單發(fā)”，具有一種穩(wěn)定狀態(tài)；但施加觸發(fā)信號(hào)可使它們離開(kāi)此狀態(tài)一段時(shí)間，該時(shí)間通常由所連接電容器的值來(lái)確定。這些器件對(duì)于去彈跳開(kāi)關(guān)觸頭等應(yīng)用非常有用。非穩(wěn)型沒(méi)有穩(wěn)定狀態(tài)，在兩個(gè)狀態(tài)之間按一定頻率持續(xù)轉(zhuǎn)換，該頻率通常也是由所連接電容器的值來(lái)確定。

DESCRIPTION

The M54/74HC4538 is a high speed CMOS DUAL MONOSTABLEMULTIVIBRATOR fabricated insilicon gate C2MOS technology. It has the same high speed performance of LSTTL combined with true CMOS low power consumption. Each multivibrator features both a negative, A, and a positive, B, edge triggered input, either of which can be used as an inhibit input. Also included is a clear input that when taken low resets the one shot. The monostable multivibrators are retriggerable. That is,they may be triggered reapeatedly while their outputs are generating a pulse and the pulse will be extended. Pulse width stability over a wide range of temperature and supply is achieved using linear CMOS techniques.

■ HIGH SPEED

tPD = 25 ns (TYP.) AT VCC = 5 V

■ LOW POWER DISSIPATION

STANDBY STATEICC =4μA(MAX.)ATTA =25°C

ACTIVE STATE ICC =200 μA (TYP.) AT VCC = 5 V

■ HIGH NOISE IMMUNITY VNIH = VNIL = 28 VCC (MIN.)

■ OUTPUT DRIVE CAPABILITY 10 LSTTL LOADS

■ BALANCED PROPAGATION DELAYS tPLH = tPHL

■ WIDE OUTPUT PULSE WIDTH RANGE

tWOUT = 120 ns ~ 60 s OVER AT VCC = 4.5 V

■ OUTPUT PULSE WIDTH INDEPENDENT FROM TRIGGER INPUT PULSE WIDTH

■ PIN AND FUNCTION COMPATIBLE WITH 4538B