描述 Description

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 Qbar output high, regardless of the state of the output pulse circuitry.

特性 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 mA
? 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*

簡介

MC74HC4538A屬于集成電路（IC）的多諧振蕩器。由制造生產(chǎn)的MC74HC4538A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)一段時間，該時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觸頭等應用非常有用。非穩(wěn)型沒有穩(wěn)定狀態(tài)，在兩個狀態(tài)之間按一定頻率持續(xù)轉換，該頻率通常也是由所連接電容器的值來確定。