M54HC423AB1R datasheet, PDF - EEWORLD Datasheet

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M54HC423AB1R: DescriptionDUAL RETRIGGERABLE MONOSTABLE MULTIVIBRATOR; File Size272KB，14 Pages; ManufacturerSTMicroelectronics; Websitehttp://www.st.com/

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M54HC423AB1R Overview

DUAL RETRIGGERABLE MONOSTABLE MULTIVIBRATOR

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M54HC423/423A

M74HC423/423A

DUAL RETRIGGERABLE MONOSTABLE MULTIVIBRATOR

HIGH SPEED

= 25 ns (TYP) at V

= 5V

LOW POWER DISSIPATION

STANDBY STATE I

µA

(MAX.) AT T

=25°C

ACTIVE STATE I

= 700

µA

(MAX.) AT V

=5V

HIGH NOISE IMMUNITY

NIH

= V

NIL

= 28 % V

(MIN.)

OUTPUT DRIVE CAPABILITY

10 LSTTL LOADS

SYMMETRICAL OUTPUT IMPEDANCE

= I

= 4 mA (MIN.)

BALANCED PROPAGATION DELAYS

PLH

= t

PHL

WIDE OPERATING VOLTAGE RANGE

(OPR) = 2 V TO 6 V

WIDE OUTPUT PULSE WIDTH RANGE

WOUT

= 120 ns

∼

60 s OVER AT V

= 4.5 V

PIN AND FUNCTION COMPATIBLE WITH

54/74LS423

B1R

(Plastic Package)

F1R

(Ceramic Package)

M1R

(Micro Package)

C1R

(Chip Carrier)

ORDER CODES :

M54HCXXXF1R

M74HCXXXM1R

M74HCXXXB1R

M74HCXXXC1R

DESCRIPTION

The M54/74HC423/423A are high speed CMOS

MONOSTABLE multivibrators fabricated with

silicon gate C

MOS technology.

They achieve the high speed operation similar to

equivalent LSTTL while maintaining the CMOS low

power dissipation. There are two trigger inputs, A

INPUT (negative edge) and B INPUT (positive

edge). These inputs are valid for rising/falling

signals, (t

– t

– 1 sec). After triggering the output

maintains the MONOSTABLE state for the time

period determined by the external resistor Rx and

capacitor Cx.

Two different pulse width constant are available:

≅

0.46 for HC423 K

≅

1 for HC423A.

Taking CLR low breaks this MONOSTABLE

STATE. If the next trigger pulse occurs during the

MONOSTABLEperiod it makes the MONOSTABLE

period longer. Limit for values of Cx and Rx :

Cx : NO LIMIT

Rx : V

< 3.0 V 5 K

Ω

to 1 M

Ω

≥

3.0 V 1 K

Ω

to 1 M

Ω

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

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