MC74HC4538AD屬于集成電路（IC）的多諧振蕩器。由安森美半導(dǎo)體公司制造生產(chǎn)的MC74HC4538AD多諧振蕩器多諧振蕩器是簡單的雙態(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)型也稱為“單發(fā)”，具有一種穩(wěn)定狀態(tài)；但施加觸發(fā)信號可使它們離開此狀態(tài)一段時(shí)間，該時(shí)間通常由所連接電容器的值來確定。這些器件對于去彈跳開關(guān)觸頭等應(yīng)用非常有用。非穩(wěn)型沒有穩(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確定。

The MC74HC4538A is identical in pinout to the MC14538B. The device inputs are compatible with standard CMOS outputs; with pullup resistors, they are compatible with LSTTL outputs.

This dual monostable multivibrator may be triggered by either the positive or the negative edge of an input pulse, and produces a precision output pulse over a wide range of pulse widths. Because the device has conditioned trigger inputs, there are no trigger?input rise and fall time restrictions. The output pulse width is determined by the external timing components, Rx and Cx. The device has a reset function which forces the Q output low and the Q output high, regardless of the state of the output pulse circuitry.

Features

? Unlimited Rise and Fall Times Allowed on the Trigger Inputs

? Output Pulse is Independent of the Trigger Pulse Width

? ± 10 Guaranteed Pulse Width Variation from Part to Part

(Using the Same Test Jig)

? Output Drive Capability: 10 LSTTL Loads

? Outputs Directly Interface to CMOS, NMOS and TTL

? Operating Voltage Range: 3.0 to 6.0 V

? Low Input Current: 1.0 μA

? High Noise Immunity Characteristic of CMOS Devices

? In Compliance with the Requirements Defined by JEDEC Standard No. 7A

? Chip Complexity: 145 FETs or 36 Equivalent Gates

? Pb?Free Packages are Available*