1/11

March 2004

s

s

LOW POWER DISSIPATION:

STAND BY STATE:

ACTIVE STATE:

s

HIGH NOISE IMMUNITY:

s

SYMMETRICAL OUTPUT IMPEDANCE:

s

BALANCED PROPAGATION DELAYS:

s

WIDE OPERATING VOLTAGE RANGE:

s

WIDE OUTPUT PULSE WIDTH RANGE:

s

PIN AND FUNCTION COMPATIBLE WITH

54 SERIES 123

s

SPACE GRADE-1: ESA SCC QUALIFIED

s

50 krad QUALIFIED, 100 krad AVAILABLE ON

REQUEST

s

NO SEL UNDER HIGH LET HEAVY IONS

IRRADIATION

s

DEVICE FULLY COMPLIANT WITH

SCC-9207-006

DESCRIPTION

The

M54HC123

is

an

high

speed

CMOS

MONOSTABLE MULTIVIBRATOR fabricated with

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=l sec).

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 MONOSTABLE state for the time

the output pulse width value is approximately

(K

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

All inputs are equipped with protection circuits

against static discharge and transient excess

voltage.

M54HC123

RAD-HARD DUAL

RETRIGGERABLE MONOSTABLE MULTIVIBRATOR

PIN CONNECTION

ORDER CODES

PACKAGE

FM

EM

DILC

M54HC123D

M54HC123D1

FPC

M54HC123K

M54HC123K1

DILC-16

FPC-16