SGS-THOMSON M54HC423, M54HC423A, M74HC423, M74HC423A Technical data

查询M54HC423供应商

DUAL RETRIGGERABLE MONOSTABLE MULTIVIBRATOR

.HIGH SPEED

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

.LOWPOWERDISSIPATION

STANDBYSTATEICC=4µA (MAX.)AT TA=25°C
ACTIVESTATEICC=700µA (MAX.)ATVCC=5V

.HIGH NOISE IMMUNITY

V

NIH=VNIL

=28%VCC(MIN.)

.OUTPUT DRIVE CAPABILITY

10 LSTTL LOADS

.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

.PIN AND FUNCTION COMPATIBLE WITH

54/74LS423

M54HC423/423A
M74HC423/423A

B1R

(PlasticPackage)

M1R

(MicroPackage)

ORDER CODES :

M54HC X XXF1R M74H CXXXM1R
M74HC X XXB1R M74HCX X XC1R

F1R

(CeramicPackage)

C1R

(Chip Carrier)

DESCRIPTION

The M54/74HC423/423A are high speed CMOS
MONOSTABLE multivibrators fabricated with
silicongate C2MOS technology.

They achieve the high speed operation similar to
equivalent LSTTL whilemaintaining the CMOSlow
power dissipation. There are two trigger inputs, A
INPUT (negative edge) and B INPUT (positive
edge). These inputs are valid for rising/falling
signals, (tr–tf– 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:
K ≅ 0.46 for HC423 K ≅ 1 for HC423A.

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
against static discharge and transient excess
voltage.

PIN CONNECTIONS(top view)

NC =
No Internal
Connection

October 1993

1/14

M54/M74HC423/423A

SYSTEM DIAGRAM

TIMING CHART

2/14

M54 / M74HC4 23 /423 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

in the stand-by state. Hence, before triggering,
transistorQpandQn(connected tothe Rx/Cxnode)
are both turned-off. The two comparators that
control the timing and the two reference voltage
sources stop operating. The total supply current is
therefore 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
comparator C1 and C2 start operating and Qn is
turned on. Cx then discharges through Qn. The
voltage at the node R/C external 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 due to the flip-flop and the gate. Q
remains highuntil 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 toV

themultivibratorhas returned toits

REFH

MONOSTABLESTATE. In the case whereRx ⋅ Cx
are large enough and the discharge time of the
capacitor and the delay time in the I.C. can be
ignored, the width of the outputpulse tw (out) is as
follows :

t

W(OUT)

= 0.46 Cx ⋅ Rx (HC423)

t

W(OUT)

=Cx⋅Rx (HC423A)

3/14

M54/M74HC423/423A

FUNCTIONAL DESCRIPTION (continued)

RE-TRIGGEREDOPERATION
When a second trigger pulse follows the first its

effect willdepend onthe state ofthe 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

minimum time for a second trigger to be effective
depends on VCCandCx.

RESETOPERATION
CL is normally high. If CL is low, the trigger is not

effective because Q output goes low 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

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

X X L L H INHIBIT

X:Don’t Care Z:HighImpedance

NOTE

INPUT AND OUTPUT EQUIVALENT CIRCUIT

4/14

M54 / M74HC4 23 /423 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,

Direct Reset (Active LOW)

2CLR

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/M74HC423/423A

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

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<2V 5Kto1M(*) Ω

X

V

≥ 3 V 1K to 1M (*)

CC

Test Conditions Value

T

High Level Input

IH

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

4.5 400 500 650 810 µA

6.0 0.7 1.0 1.3 1.6 mA

Pin 7 or 15

VIN=VCC/2

45 200 260 325 µA

54HC

V
V

o

C

o

C

Unit

V

V

V

V

6/14

M54 / M74HC4 23 /423 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

4.5 8 15 19

A

54HC and 74HC

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

6.0 7 13 16

t

PLH

t

PHL

t

PLH

t

PHL

t

WOUT

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

Propagation
Delay Time
(CLR - Q, Q)

Output Pulse
Width
(for HC423)

2.0 102 210 265

4.5 29 42 53

6.0 22 36 45

2.0 68 160 200

4.5 20 32 40

6.0 16 27 34

2.0 CX= 100 pF

4.5 1.1

RX=10KΩ

1.3

6.0 1

2.0 C

4.5 4.6

= 0.1 µF

X

R

= 100 KΩ

X

4.8

6.0 4.5

t

WOUT

Output Pulse
Width
(for HC423A)

2.0 CX= 100 pF

4.5 1.4

RX=10KΩ

1.7

6.0 1.3

2.0 C

4.5 9.5

= 0.1 µF

X

RX= 100 KΩ

10

6.0 9.5

∆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

4.5 15 19

6.0 13 16

t

W(L)

Minimum Pulse
Width

2.0 75 95

4.5 15 19

6.0 13 16

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

160

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

µs

ms

µs

ms

%

ns

ns

ns

µs

pF

7/14

M54/M74HC423/423A

Output Pulse Width Constant Characteristics
(for HC423)

Output Pulse Width Characteristics (for HC423)

Output Pulse Width Constant Characteristics
(for HC423A)

Output Pulse Width Characteristics (for HC423A)

8/14

TEST CIRCUIT ICC(Opr)

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

SWITCHING CHARACTERISTICS TEST WAVEFORM

M54 / M74HC4 23 /423 A

9/14

M54/M74HC423/423A

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 / M74HC4 23 /423 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/M74HC423/423A

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 / M74HC4 23 /423 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/M74HC423/423A

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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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