Datasheet M74HC221A, M74HC221 Datasheet (SGS Thomson Microelectronics)

DUAL 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 TO 6 V

.WIDE OUTPUT PULSE WIDTHRANGE

t

=150ns ∼ 60 s OVER AT VCC= 4.5 V

WOUT

.PIN AND FUNCTION COMPATIBLE WITH

54/74LS221

M54HC221/221A
M74HC221/221A

B1R

(PlasticPackage)

M1R

(MicroPackage)

ORDER CODES :

M54HC X XXF1R M74H CXXXXM1R
M74HC X XXB1R M74HCX X XC1R

F1R

(CeramicPackage)

C1R

(Chip Carrier)

DESCRIPTION

The M54/74HC221/221A are high speed CMOS
MONOSTABLE multivibrators fabricated with sili­con gate C2MOS technology. It achieves the high
speed operation similar to equivalent LSTTL while
maintainingtheCMOSlowpowerdissipation.There
aretwotriggerinputs,AINPUT (negativeedge) and
B INPUT (positive edge). Triggering on theB input
occursata particularvoltage thresholdandisnotre­latedto the rise and falltime oftheapplied pulse.
The device mayalso be triggeredbyusing the CLR
input(positive-edge) because ofthe Schmitt-trigger
input ; after triggering the output maintains the
MONOSTABLEstateforthetimeperiod determined
by theexternal resistor Rx andcapacitor Cx.Taking
CLR lowbreaksthis MONOSTABLESTATE. If the
nexttrigger pulse occursduring theMONOSTABLE
period it makes the MONOSTABLE period longer.
Limit forvalues of CxandRx :
Cx : NO LIMIT
Rx : VCC<3.0 V 5K Ω to 1 M Ω

VCC≥ 3.0 V 1 K Ω to 1 M Ω
Two different pulse width constants are available:
K ≅ 0.7 for HC221
K ≅ 1 for HC221A
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/M74HC221/221A

SYSTEM DIAGRAM

TIMING CHART

2/14

M54 / M74HC2 21 /221 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 :
1st) A is ”low” and B hasa falling edge;

2nd) B is”high” and Ahas a rising edge ;
3rd) A islowand Bis highand 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.

Whenit reaches V

theoutputof comparatorC1

REFL

becomeslow. Thisin turnresetstheflip-flopandQn
is turnedoff.

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)

= 0.70 Cx ⋅ Rx (HC221)

t

W(OUT)

=Cx⋅Rx (HC221A)

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.

3/14

M54/M74HC221/221A

TRUTH TABLE

INPUTS OUTPUTS

A B CLR Q Q

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 (*):Except for monostble period

INPUT AND OUTPUT EQUIVALENT CIRCUIT

NOTE

PIN DESCRIPTION

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

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

72R

EXT/CEXT

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

15 1R

EXT

2C

EXT

EXT/CEXT

8 GND Ground (0V)

16 V

CC

Direct Reset LOW and
Trigger Action at Positive
Edge

External Resistor
Capacitor Connection

External Capacitor
Connection

External Resistor
Capacitor Connection

Positive Supply Voltage

IEC LOGIC SYMBOL

4/14

M54 / M74HC2 21 /221 A

ABSOLU TE MAXIMU M RAT 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

RECO MM ENDED OPERATING C O NDITI O NS

Symbol Parameter Value Unit

V

CC

V

I

V

O

T

op

t

r,tf

C

X

R

X

(*)Themaximum allowablevaluesof Cx andRx are a functionof leackage ofcapacitor Cx,the leackage ofHC221/A, andleackage due to the
boardlayout and surfaceresistance. Susceptibility to externally inducednoise signals may occur for Rx> 1MΩ

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

Supply Voltage 2 to 6 V
Input Voltage 0 to V
Output Voltage 0 to V
Operating Temperature: M54HC Series

M74HC Series

CC
CC

-55 to +125

-40 to +85

Input Rise and Fall Time (CLR and A only) VCC= 2 V 0 to 1000 ns

V

= 4.5 V 0 to 500

CC

V

= 6 V 0 to 400

CC

External Capacitor > 100 (*) pF
External Resistor VCC<3V 5Kto1M(*) Ω

≥ 3 V 1K to 1M (*)

V

CC

o

C

o

C

V
V

o

C

o

C

5/14

M54/M74HC221/221A

DC SPECIFICATIO NS

Symbol Parameter

V

V

V

V

I

I

CC

(1):Per Circuit

High Level Input

IH

Voltage

Low Level Input

IL

Voltage

High Level

OH

Output Voltage
(Q, Q Output)

Low Level Output

OL

Voltage
(Q, Q Output)

I

Input Leakage

I

Current
R/C Terminal Off

I

I

State Current
Quiescent Supply

CC

Current

’ Active State

Supply Current (1)

Test Conditions Value

V

(V)

CC

=25oC

A

54HC and 74HC

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

-40 to 85oC
74HC

-55 to 125oC
54HC

Unit

T

2.0 1.5 1.5 1.5

4.5 3.15 3.15 3.15

6.0 4.2 4.2 4.2

2.0 0.5 0.5 0.5

4.5 1.35 1.35 1.35

6.0 1.8 1.8 1.8

2.0

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

=

V

I

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

VI=VCCor GND ±0.1 ±1 ±1 µA

V

I=VCC

or GND ±0.5 ±5 ±10 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

2.0 VI=VCCor GND

4.5 400 530 650 850 µA

VIN=VCC/2

45 250 260 350 µA

6.0 0.7 1 1.3 1.7 mA

V

V

V

V

6/14

M54 / M74HC2 21 /221 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 HC221)

2.0 102 210 265 315

4.5 30 42 53 63

6.0 24 36 45 54

2.0 102 235 295 355

4.5 30 47 59 71

6.0 24 40 50 60

2.0 67 160 200 240

4.5 20 32 40 48

6.0 16 27 34 41

2.0 CX= 100 pF
R

=10KΩ

4.5 1.3

X

1.5

6.0 1.2

2.0 C

4.5 6.9

= 0.1 µF

X

RX= 100 KΩ

7

6.0 6.9

t

WOUT

Output Pulse
Width
(for HC221A)

2.0 CX= 100 pF

4.5 1.5

RX=10KΩ

1.8

6.0 1.4

2.0 C

4.5 9.7

= 0.1 µF

X

RX= 100 KΩ

10

6.0 9.6

∆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 20

t

W(L)

Minimum Pulse
Width

2.0 75 95 110

4.5 15 19 22

6.0 13 16 20

C

C

PD

Input Capacitance 5 10 10 10 pF

IN

(*) Power Dissipation

174

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

pF

7/14

M54/M74HC221/221A

Output Pulse Width Constant Characteristics
(for HC221)

Output Pulse Width Characteristics (for HC221)

Output Pulse Width Constant Characteristics
(for HC221A)

Output Pulse Width Characteristics (for HC221A)

8/14

SWITCHING CHARACTERISTICS TEST WAVEFORM

M54 / M74HC2 21 /221 A

TEST WAVEFORM

Input TransitionTime : 6ns
VIH=VCC,VIL=GND.

9/14

M54/M74HC221/221A

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 / M74HC2 21 /221 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/M74HC221/221A

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 / M74HC2 21 /221 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/M74HC221/221A

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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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