Datasheet M74HC123, M74HC123A Datasheet (SGS Thomson Microelectronics)

M54HC123/123A
M74HC123/123A

DUAL RETRIGGERABLE MONOSTABLE MULTIVIBRATOR

.HIGH SPEED

tPD= 25 ns(TYP) at VCC=5V

.LOWPOWERDISSIPATION

STANDBYSTATEICC=4µA (MAX.)AT TA=25°C
ACTIVESTATE ICC=200µA (TYP.) AT VCC=5V

.HIGH NOISE IMMUNITY

V

NIH=VNIL

.OUTPUT DRIVE CAPABILITY

10 LSTTL LOADS

=28%VCC(MIN.)

B1R

(PlasticPackage)

(CeramicPackage)

.SYMMETRICALOUTPUT IMPEDANCE

IOH=IOL= 4 mA (MIN.)

.BALANCEDPROPAGATION DELAYS

t

PLH=tPHL

.WIDE OPERATINGVOLTAGERANGE

VCC(OPR)= 2V TO6 V

.WIDE OUTPUT PULSE WIDTHRANGE

t

=120ns ∼ 60 s OVER AT VCC= 4.5 V

WOUT

M1R

(MicroPackage)

ORDER CODES :

M54HC X XXF1R M74H CXXXM1R
M74HC X XXB1R M74HCX X XC1R

(Chip Carrier)

.PIN AND FUNCTION COMPATIBLE WITH

54/74LS123

F1R

C1R

DESCRIPTION

The M54/74HC123 is a high speed CMOS MONO­STABLE multivibrator fabricated with silicon gate
C2MOS technology. It achieves the high speed
operation similar to equivalent LSTTL while main­tainingthe CMOS lowpower dissipation. There are
two trigger inputs,A INPUT (negative edge) and 8
INPUT (positive edge). These inputs are valid for
slowrising/falling signals,(tr= tf= Isec).The device
may also betriggered by using the CLRinput(posi­tive-edge) because of the Schmitt-trigger input ;
after triggering the output maintains the MONO­STABLEstatefor thetime period determinedby the
external resistor Rx and capacitor Cx. When Cx ≥
10nF and Rx ≥ 10KΩ,theoutput pulse widthvalue
is approssimatively given by theformula: t

•Cx • Rx.
Two different pulse width constant are available:
K ≅ 0.45 for HC123 K ≅ 1 for HC123A.
Taking CLR low breaks this MONOSTABLE
STATE. If the next trigger pulse occurs during the
MONOSTABLEperiodit makestheMONOSTABLE
periodlonger. Limit for values ofCx and Rx :
Cx : NO LIMIT
Rx : VCC<3.0 V 5K Ω to1 M Ω

VCC≥ 3.0 V 1 K Ω to 1 M Ω

All inputs are equipped with protection circuits

w(out)

=K

PIN CONNECTIONS(top view)

NC =
No Internal
Connection

October 1993

1/14

M54/M74HC123/123A

SYSTEM DIAGRAM

TIMING CHART

2/14

M54 / M74HC1 23 /123 A

BLOCK DIAGRAM

Note:

(1)Cx, Rx, Dx are externalcomponents.
(2)Dx isa clampingdiode.
Theexternalcapacitor ischarged toVCCinthestand-by state,i.e.notrigger.Whenthesupply voltageis turned offCxis dischargedmainly

throughan internalparasiticdiode (see figures). IfCx issufficientlylarge and VCCdecreases rapidy,therewill besomepossibility of da­magingtheI.C.witha surgecurrentor latch-up. If the voltagesupply filtercapacitor is largeenough and VCCdecrease slowly,the surge
currentis automaticallylimitedand damage the I.C. is avoided. Themaximumforwardcurrentof the parasiticdiodeisapproximately 20
mA.In caseswhereCx is large the timetakenfor the supply voltageto fallto 0.4VCCcanbecalculated asfollows:

tf≥ (VCC–0.7)⋅Cx/20mA
Incases wheretfistoo short anexternal clampingdiode is required toprotect theI.C.fromthe surge current.

FUNCTIONAL DESCRIPTION

STAND-BYSTATE
The external capacitor, Cx, is fully charged to V

CC

inthe stand-bystate.Hence, beforetriggering,tran­sistorQp andQn (connected tothe Rx/Cxnode)are
both turned-off. The two comparators that control
the timing and the two reference voltage sources
stop operating. The totalsupply current istherefore
only leakage current.

TRIGGEROPERATION
Triggering occurswhen :
1 st) A is”low” andB hasa falling edge ;

2 nd) B is ”high”and Ahas a rising edge;
3 rd) AislowandB ishighand C1hasa risingedge.

After the multivibrator has been retriggered com­paratorC1 and C2 start operating and Qn isturned
on. Cx then discharges through Qn.The voltageat
the node R/Cexternal falls.

When itreaches V

theoutputof comparatorC1

REFL

becomeslow.Thisinturnresets theflip-flop andQn
is turned off.

At this pointC1 stopsfunctioning but C2 continues
to operate.

ThevoltageatR/Cexternalbeginstorisewithatime
constantset by the externalcomponents Rx, Cx.

Triggering themultivibratorcausesQto gohighafter
internal delay dueto the flip-flop and the gate. Qre­mains high until the voltage at R/C external rises
againto V

. AtthispointC2outputgoeslow and

REFH

O goes low. C2 stop operating. That means that
after triggering when the voltage R/C external re­turns to V

the multivibrator has returned to its

REFH

MONOSTABLESTATE. In the case whereRx ⋅ Cx
are large enough and thedischargetime of the ca­pacitorand thedelaytime inthe I.C.can beignored,
the width ofthe output pulse tw (out) is as follows :

t

W(OUT)

= 0.46 Cx ⋅ Rx (HC123)

t

W(OUT)

=Cx⋅Rx (HC123A)

3/14

M54/M74HC123/123A

FUNCTIONAL DESCRIPTION (continued)

RE-TRIGGEREDOPERATION
When a second trigger pulse followsthe first its ef-

fect will depend on the state of the multivibrator. If
the capacitor Cx is being charged the voltage level
of R/C external falls to Vrefl again and Q remains
high i.e.the retrigger pulse arrives in atimeshorter
than the period Rx ⋅ Cx seconds, the capacitor
charging time constant.If the second trigger pulse
is verycloseto theinitialtrigger pulseitisineffective
; i.e. thesecond triggermust arrive in the capacitor

mum time for a second trigger to be effective de­pendson VCCand Cx.

RESETOPERATION
CL isnormallyhigh.If CLislow,the triggeris not ef-

fectivebecauseQoutput goeslow and trigger con­trol flip-flopis reset.

Also transistor Op is turned on and Cx is charged
quickyto VCC. Thismeans if CL inputgoes low,the
IC becomeswaiting state both inoperating andnon
operating state.

discharge cycle to be ineffective; Hence the mini-

TRUTH TABLE

INPUTS OUTPUTS

ABCLQQ

H H OUTPUT ENABLE
X L H L H INHIBIT
H X H L H INHIBIT

L H OUTPUT ENABLE
L H OUTPUT ENABLE

X X L L H INHIBIT

X:Don’t Care Z: HighImpedance

NOTE

INPUT AND OUTPUT EQUIVALENT CIRCUIT

4/14

M54 / M74HC1 23 /123 A

PIN DESCRIPTION

IEC LOGIC SYMBOL

PIN No SYMBOL NAME AND FUNCTION

1, 9 1A, 2A Trigger Inputs (Negative

Edge Triggered)

2, 10 1B, 2B Trigger Inputs (Positive

Edge Triggered)

3, 11 1CLR,

2CLR

Direct Reset LOW and
Trigger Action at Positive
Edge

4, 12 1Q, 2Q Outputs (Active LOW)

72R

EXT/CEXT

External Resistor

Capacitor Connection
13, 5 1Q, 2Q Outputs (Active HIGH)
14, 6 1C

2C

15 1R

EXT/CEXT

EXT
EXT

External Capacitor

Connection

External Resistor

Capacitor Connection

8 GND Ground (0V)

16 V

CC

Positive Supply Voltage

ABSOLU TE M AXIMU M R AT ING

Symbol Parameter Value Unit

V

CC

V

V

O

I

IK

I

OK

I

O

I

or I

CC

P

D

T

stg

T

AbsoluteMaximumRatingsarethosevalues beyondwhichdamagetothedevicemayoccur.Functionaloperationunderthesecondition isnotimplied.
(*)500 mW: ≅ 65oC derateto300mW by 10mW/oC: 65oCto85oC

Supply Voltage -0.5 to +7 V
DC Input Voltage -0.5 to VCC+ 0.5 V

I

DC Output Voltage -0.5 to VCC+ 0.5 V
DC Input Diode Current ± 20 mA
DC Output Diode Current ± 20 mA
DC Output Source Sink Current Per Output Pin ± 25 mA
DC VCCor Ground Current ± 50 mA

GND

Power Dissipation 500 (*) mW
Storage Temperature -65 to +150
Lead Temperature (10 sec) 300

L

o

C

o

C

5/14

M54/M74HC123/123A

RECO MM ENDED OPERAT IN G CO NDI TIONS

Symbol Parameter Value Unit

V

V

V

T

t

r,tf

C
R

(*)The maximumallowable values ofCx andRx area function of leakage of capacitor Cx,the leakageof device and leakagedueto the board
layoutand surfaceresistance. Susceptibility toexternally induced noisemay occur for Rx > 1MΩ

DC SPECIFICATIONS

Symbol Parameter

V

IH

V

V

OH

V

OL

I

I

I

CC

I

CC

(1):Per Circuit

Supply Voltage 2 to 6 V

CC

Input Voltage 0 to V

I

Output Voltage 0 to V

O

Operating Temperature: M54HC Series

op

M74HC Series

CC
CC

-55 to +125

-40 to +85

Input Rise and Fall Time 0 to 1000 ns

0 to 500
0 to 400

External Capacitor NO LIMITATION

X

External Resistor VCC<3V 5Kto1M Ω

X

V

≥ 3 V 1K to 1M

CC

Test Conditions Value

T

High Level Input
Voltage

=25oC

V

(V)

CC

A

54HC and 74HC

Min. Typ. Max. Min. Max. Min. Max.

2.0 1.5 1.5 1.5

4.5 3.15 3.15 3.15

-40 to 85oC
74HC

-55 to 125oC

6.0 4.2 4.2 4.2

Low Level Input

IL

Voltage

2.0 0.5 0.5 0.5

4.5 1.35 1.35 1.35

6.0 1.8 1.8 1.8

High Level
Output Voltage

Low Level Output
Voltage

Input Leakage

I

Current
R/C Terminal Off

I

State Current
Quiescent Supply

2.0
V

=

I

4.5 4.4 4.5 4.4 4.4

6.0 5.9 6.0 5.9 5.9

4.5 I

6.0 I

2.0

4.5 0.0 0.1 0.1 0.1

6.0 0.0 0.1 0.1 0.1

4.5 I

6.0 I

6.0

6.0

IO=-20 µA

V

IH

or

V

IL

=-4.0 mA 4.18 4.31 4.13 4.10

O

=-5.2 mA 5.68 5.8 5.63 5.60

O

V

=

I

IO=20µA

V

IH

or

V

IL

= 4.0 mA 0.17 0.26 0.33 0.40

O

= 5.2 mA 0.18 0.26 0.33 0.40

O

V

I=VCC

or GND ±0.1 ±1 ±1 µA

VI=VCCor GND ±0.1 ±1 ±1 µA

1.9 2.0 1.9 1.9

0.0 0.1 0.1 0.1

6.0 VI=VCCor GND 4 40 80 µA

Current

’ Active State

Supply Current (1)

2.0 VI=VCCor GND

4.5 500 600 780 960 µA

6.0 0.7 1 1.3 1.6 mA

Pin 7 or 15

VIN=VCC/2

45 200 260 320 µA

54HC

V
V

o

C

o

C

pF

Unit

V

V

V

V

6/14

M54 / M74HC1 23 /123 A

AC ELECTRICAL CHARACTERISTICS (CL=50pF,Inputtr=tf=6ns)

Test Conditions Value

T

=25oC

Symbol Parameter

t
t

TLH
THL

Output Transition
Time

V

CC

(V)

2.0 30 75 95 110

4.5 8151922

A

54HC and 74HC

Min. Typ. Max. Min. Max. Min. Max.

6.0 7131619

t

PLH

t

PHL

t

PLH

t

PHL

t

PLH

t

PHL

t

WOUT

Propagation
Delay Time
(A, B - Q, Q)

Propagation
Delay Time
(CLRTRIGGER- Q,Q)

Propagation
Delay Time
(CLR - Q, Q)

Output Pulse
Width
(for HC123)

2.0 102 210 265 315

4.5 29 42 53 63

6.0 22 36 45 54

2.0 102 235 295 355

4.5 31 47 59 71

6.0 23 40 50 60

2.0 68 160 200 240

4.5 20 32 40 48

6.0 16 27 34 41

2.0 CX= 100 pF

R

=10KΩ

4.5 1.2

X

1.4

6.0 1.1

2.0 C

4.5 4.4

= 0.1 µF

X

RX= 100 KΩ

4.6

6.0 4.3

t

WOUT

Output Pulse
Width
(for HC123A)

2.0 CX= 100 pF

4.5 1.6

RX=10KΩ

1.9

6.0 1.5

2.0 C

4.5 9.5

= 0.1 µF

X

RX= 100 KΩ

9.8

6.0 9.4

∆t

WOUT

Output Pulse

±1
Width Error
Between Circuits
in Same Package

t

W(H)

t

W(L)

Minimum Pulse
Width

2.0 75 95 110

4.5 15 19 22

6.0 13 16 19

t

W(L)

Minimum Pulse
Width (CLR)

2.0 75 95 110

4.5 15 19 22

6.0 13 16 19

t

rr

Minimum
Retrigger Time

2.0 CX= 100 pF

4.5 108

RX=1KΩ

325

6.0 78

2.0 C

4.5 1.4

= 0.1 µF

X

RX= 100 KΩ

5

6.0 1.2

C

C

PD

Input Capacitance 5 10 10 10 pF

IN

(*) Power Dissipation

162

Capacitance

(*) CPDisdefined as the valueofthe IC’s internal equivalent capacitance which is calculated from the operatingcurrent consumption withoutload.
(RefertoTestCircuit).Averageopertingcurrentcanbeobtainedbythefollowingequation.ICC(opr)=CPD•VCC•fIN+ICC’Duty/100+IC/2(permonostable)
(ICC’:ActiveSupply Current) (Duty:%)

-40 to 85oC
74HC

-55 to 125oC
54HC

Unit

ns

ns

ns

ns

µs

ms

µs

ms

%

ns

ns

ns

µs

pF

7/14

M54/M74HC123/123A

Output Pulse Width Constant Characteristics
(for HC123)

Output Pulse Width Characteristics (for HC123)

Output Pulse Width Constant Characteristics
(for HC123A)

Output Pulse Width Characteristics (for HC123A)

8/14

TEST CIRCUIT ICC(Opr)

* TRANSITIONTIME OF INPUT WAVEFORM IS THE SAME AS
THATIN SASEOF SWITCHINGCHARACTERISTICSTESTS.

SWITCHING CHARACTERISTICS TEST WAVEFORM

M54 / M74HC1 23 /123 A

9/14

M54/M74HC123/123A

Plastic DIP16 (0.25) MECHANICAL DATA

DIM.

MIN. TYP. MAX. MIN. TYP. MAX.

a1 0.51 0.020

B 0.77 1.65 0.030 0.065
b 0.5 0.020

b1 0.25 0.010

D 20 0.787

E 8.5 0.335
e 2.54 0.100

e3 17.78 0.700

F 7.1 0.280

I 5.1 0.201
L 3.3 0.130
Z 1.27 0.050

mm inch

10/14

P001C

Ceramic DIP16/1 MECHANICAL DATA

M54 / M74HC1 23 /123 A

DIM.

MIN. TYP. MAX. MIN. TYP. MAX.

A 20 0.787
B 7 0.276

D 3.3 0.130

E 0.38 0.015

e3 17.78 0.700

F 2.29 2.79 0.090 0.110

G 0.4 0.55 0.016 0.022
H 1.17 1.52 0.046 0.060

L 0.22 0.31 0.009 0.012

M 0.51 1.27 0.020 0.050

N 10.3 0.406

P 7.8 8.05 0.307 0.317

Q 5.08 0.200

mm inch

P053D

11/14

M54/M74HC123/123A

SO16 (Narrow) MECHANICAL DATA

DIM.

MIN. TYP. MAX. MIN. TYP. MAX.

A 1.75 0.068

a1 0.1 0.2 0.004 0.007
a2 1.65 0.064

b 0.35 0.46 0.013 0.018

b1 0.19 0.25 0.007 0.010

C 0.5 0.019

c1 45° (typ.)

D 9.8 10 0.385 0.393

E 5.8 6.2 0.228 0.244
e 1.27 0.050

e3 8.89 0.350

F 3.8 4.0 0.149 0.157

G 4.6 5.3 0.181 0.208

L 0.5 1.27 0.019 0.050

M 0.62 0.024

S8°(max.)

mm inch

12/14

P013H

PLCC20 MECHANICAL DATA

M54 / M74HC1 23 /123 A

DIM.

MIN. TYP. MAX. MIN. TYP. MAX.

A 9.78 10.03 0.385 0.395
B 8.89 9.04 0.350 0.356

D 4.2 4.57 0.165 0.180
d1 2.54 0.100
d2 0.56 0.022

E 7.37 8.38 0.290 0.330
e 1.27 0.050

e3 5.08 0.200

F 0.38 0.015

G 0.101 0.004
M 1.27 0.050

M1 1.14 0.045

mm inch

P027A

13/14

M54/M74HC123/123A

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consequences of useof such information norfor any infringementof patents or other rights of third parties which may results from its use. No
license is granted byimplication or otherwiseunder any patentor patent rightsof SGS-THOMSON Microelectronics.Specificationsmentioned
in thispublication are subjectto change without notice.This publication supersedes and replaces all information previouslysupplied.
SGS-THOMSON Microelectronicsproducts are not authorized foruse ascritical componentsin life supportdevices or systemswithout express
written approval ofSGS-THOMSON Microelectonics.

 1994SGS-THOMSON Microelectronics- All Rights Reserved

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