M54HC221 Datasheet PDF | STMicroelectronics

STMicroelectronics M54HC221

The M54/74HC221/221A are high speed CMOS MONOSTABLE multivibrators fabricated with silicon gate C2MOS technology. It achieves the high speed operation similar to equivalent LSTTL while maintaining the CMOS low power dissipation. The device may also be triggered by using the CLR input (positive-edge) because of the Schmitt-trigger input ; after triggering the output maintains the MONOSTABLEstate for the time period determined by the external resistor Rx and capacitor Cx.Taking CLR low breaks this MONOSTABLE STATE.

Part No.	M54HC221
Datasheet	M54HC221 Download
Manufacturer	STMicroelectronics
Description	DUAL MONOSTABLE MULTIVIBRATOR
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DESCRIPTION

There are two trigger inputs, A INPUT (negative edge) and B INPUT (positive edge). Triggering on the B input occurs at a particular voltage threshold and is not related to the rise and fall time of the applied pulse. 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 < 3.0 V 5 K Ω to 1 M Ω VCC ≥ 3.0 V 1 K Ω to 1 M Ω Two different pulse width constants are available: K ≅ 0.7 for HC221 K ≅ 1 for HC221A All inputs are equipped with protection circuits against static discharge and transient excess voltage. October 1993 PIN CONNECTIONS (top view) NC = No Internal Connection 1/14 M54/M74HC221/221A SYSTEM DIAGRAM TIMING CHART 2/14 M54/M74HC221/221A BLOCK DIAGRAM Note : (1) Cx, Rx, Dx are external components. (2) Dx is a clamping diode. The external capacitor is charged to VCC inthe stand-by state, i.e. no trigger. When the supply voltage is turned off Cx is discharged mainly through an internal parasitic diode (see figures).