M74HC123 Datasheet PDF | STMicroelectronics

STMicroelectronics M74HC123

The M74HC123 is an high speed CMOS c MONOSTABLE MULTIVIBRATOR fabricated with u silicon gate C2MOS technology. These inputs P are valid for slow rising/falling signals, (tr=tf=l sec). When Cx > 10nF and Rx > 10KΩ, the output pulse width value is approsimatively given by the formula : tW(OUT) = K · Cx · Rx.

Part No.	M74HC123
Datasheet	M74HC123 Download
Manufacturer	STMicroelectronics
Description	DUAL RETRIGGERABLE MONOSTABLE MULTIVIBRATOR
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DESCRIPTION

d There are two trigger inputs, A INPUT (negative ro edge) and B INPUT (positive edge). te The device may also be triggered by using the CLR input (positive-edge) because of the le Schmitt-trigger input; after triggering the output o maintains the MONOSTABLE state for the time ObsPIN CONNECTION AND IEC LOGIC SYMBOLS DIP SOP TSSOP ORDER CODES PACKAGE TUBE DIP SOP TSSOP M74HC123B1R M74HC123M1R T&R M74HC123RM13TR M74HC123TTR period determined by the external resistor Rx and capacitor Cx. (K ≅ 0.45). Taking CLR low breaks this MONOSTABLE STATE. If the next trigger pulse occurs during the MONOSTABLE period it makes the MONOSTABLE period longer. Limit for values of Cx and Rx : Cx : NO LIMIT Rx : Vcc < 3.0V 5KΩ to 1MΩ Vcc > 3.0V 1KΩ to 1MΩ All inputs are equipped with protection circuits against static discharge and transient excess voltage. July 2001 1/12 M74HC123 INPUT AND OUTPUT EQUIVALENT CIRCUIT PIN

DESCRIPTION

PIN No SYMBOL NAME AND FUNCTION 1,9 1A, 2A Trigger Inputs (Negati...