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M74HC423M1R

DUAL RETRIGGERABLE MONOSTABLE MULTIVIBRATOR

STMicroelectronics 

M74HC423

DUAL RETRIGGERABLE MONOSTABLE MULTIVIBRATOR

s HIGH SPEED :

tPD = 22 ns (TYP.) at VCC = 6V

s LOW POWER DISSIPATION:

STAND BY STATE :

ICC=4µA (MAX.) at TA=25°C

ACTIVE STATE :

ICC=700µA (TYP.) at VCC = 6V

s HIGH NOISE IMMUNITY:

VNIH = VNIL = 28 % VCC (MIN.)

s SYMMETRICAL OUTPUT IMPEDANCE:

|IOH| = IOL = 4mA (MIN)

s BALANCED PROPAGATION DELAYS:

tPLH ≅ tPHL

s WIDE OPERATING VOLTAGE RANGE:

VCC (OPR) = 2V to 6V

s WIDE OUTPUT PULSE WIDTH RANGE :

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

s PIN AND FUNCTION COMPATIBLE WITH

74 SERIES 423

DESCRIPTION

The M74HC423 is an high speed CMOS

MONOSTABLE MULTIVIBRATOR fabricated with

silicon gate C2MOS technology.

There are two trigger inputs, A INPUT (negative

edge) and B INPUT (positive edge). These inputs

are valid for slow rising/falling signals, (tr = tf = 1

sec). After triggering the output maintains the

MONOSTABLE state for the time period

DIP

SOP

TSSOP

ORDER CODES

PACKAGE

TUBE

DIP

SOP

TSSOP

M74HC423B1R

M74HC423M1R

T&R

M74HC423RM13TR

M74HC423TTR

determined by the external resistor Rx and

capacitor Cx.

The pulse width constant is K ≅ 0.46.

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.

PIN CONNECTION AND IEC LOGIC SYMBOLS

July 2001

1/11

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