National Semiconductor MM54HC423A, MM74HC423A Service Manual

MM54HC423A/MM74HC423A
Dual Retriggerable Monostable Multivibrator

General Description

The MM54/74HC423A high speed monostable multivibra­tors (one shots) utilize advanced silicon-gate CMOS tech­nology. They feature speeds comparable to low power
Schottky TTL circuitry while retaining the low power and
high noise immunity characteristic of CMOS circuits.

Each multivibrator features both a negative, A, and a posi­tive, B, transition triggered input, either of which can be
used as an inhibit input. Also included is a clear input that
when taken low resets the one shot. The ’HC423A cannot
be triggered from clear.

The ’HC423A is retriggerable. That is, it may be triggered
repeatedly while its outputs are generating a pulse and the
pulse will be extended.

Pulse width stability over a wide range of temperature and
supply is achieved using linear CMOS techniques. The out­put pulse equation is simply: PW

e

(R

)(C

EXT

); where PW

EXT

Connection Diagram

is in seconds, R is in ohms, and C is in farads. All inputs are
protected from damage due to static discharge by diodes to
V

and ground.

CC

Features

Y

Typical propagation delay: 40 ns

Y

Wide power supply range: 2V – 6V

Y

Low quiescent current: 80 mA maximum (74HC Series)

Y

Low input current: 1 mA maximum

Y

Fanout of 10 LS-TTL loads

Y

Simple pulse width formula TeRC

Y

Wide pulse range: 400 ns to%(typ)

Y

Part to part variation:g5% (typ)

Y

Schmitt TriggerA&Binputs allow infinite rise and fall
times on these inputs

MM54HC423A/MM74HC423A Dual Retriggerable Monostable Multivibrator

January 1988

Dual-In-Line Package

Top View

TL/F/5338– 1

Order Number MM54HC423A or MM74HC423A

Truth Table

Inputs Outputs

Clear AB Q Q

LXXLH
XHXLH
XXLLH
HL
H

v

u

H Éß

Éß

Timing Component

e

H

High Level

e

L

Low Level

e

Transition from Low to High

u

e

Transition from High to Low

v

e

É

One High Level Pulse

e

ß

One Low Level Pulse

e

X

Irrelevant

TL/F/5338– 2

Note: Pin 6 and Pin 14 must be hard­wired to GND.

C

1995 National Semiconductor Corporation RRD-B30M105/Printed in U. S. A.

TL/F/5338

Absolute Maximum Ratings (Notes1&2)

If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales
Office/Distributors for availability and specifications.

Supply Voltage (V

CC

)

DC Input Voltage (VIN)

DC Output Voltage (V

OUT

)

Clamp Diode Current (IIK,IOK)

DC Output Current, per pin (I

OUT

)

DC VCCor GND Current, per pin (ICC)

Storage Temperature Range (T

STG

b

b

)

b

0.5V toa7.0V

1.5V to V

CC

0.5V to V

CC

g

g

b

g

65§Ctoa150§C

a

1.5V

a

0.5V

20 mA

25 mA

50 mA

Power Dissipation (PD)

(Note 3) 600 mW
S.O. Package only 500 mW

Lead Temp. (T

) (Soldering 10 seconds) 260§C

L

DC Electrical Characteristics (Note 4)

Symbol Parameter Conditions V

V

V

V

V

I

IN

I

IN

I

CC

I

CC

Minimum High Level Input 2.0V 1.5 1.5 1.5 V

IH

Voltage 4.5V 3.15 3.15 3.15 V

Maximum Low Level Input 2.0V 0.3 0.3 0.3 V

IL

Voltage 4.5V 0.9 0.9 0.9 V

Minimum High Level V

OH

Output Voltage

Maximum Low Level V

OL

Output Voltage

Maximum Input Current V
(Pins 7, 15)

Maximum Input Current V
(all other pins)

Maximum Quiescent Supply V
Current (standby) I

Maximum Active Supply V
Current (per R/C
monostable) 6.0V 0.7 2.0 2.6 3.2 mA

Note 1: Maximum Ratings are those values beyond which damage to the device may occur.

Note 2: Unless otherwise specified all voltages are referenced to ground.

Note 3: Power Dissipation Temperature Derating: Plastic ‘‘N’’ Package:

Note 4: For a power supply of 5V

with this supply. Worst-case V

) occur for CMOS at the higher voltage and so the 6.0V values should be used.

I

OZ

g

10% the worst-case output voltages (VOH,VOL) occur for HC at 4.5V. Thus the 4.5V values should be used when designing

and VILoccur at V

IH

e

VIHor V

IN

s

I

20 mA 2.0V 2.0 1.9 1.9 1.9 V

l

l

OUT

e

V

VIHor V

IN

s

I

4.0 mA 4.5V 3.96 3.84 3.7 V

l

l

OUT

s

I

5.2 mA 6.0V 5.46 5.34 5.2 V

l

l

OUT

e

VIHor V

IN

s

I

20 mA 2.0V 0 0.1 0.1 0.1 V

l

l

OUT

e

V

VIHor V

IN

s

I

4 mA 4.5V 0.26 0.33 0.4 V

l

l

OUT

s

I

5.2 mA 6.0V 0.26 0.33 0.4 V

l

l

OUT

e

VCCor GND 5.0V 0.5 5.0 5.0 mA

IN

e

VCCor GND 6.0V

IN

e

VCCor GND 6.0V 8.0 80 160 mA

IN

e

0 mA

OUT

e

VCCor GND 2.0V 36 80 110 130 mA

IN

e

0.5VCC4.5V 0.33 1.0 1.3 1.6 mA

EXT

e

5.5V and 4.5V respectively. (The VIHvalue at 5.5V is 3.85V.) The worst-case leakage current (IIN,ICC, and

CC

CC

Typ Guaranteed Limits

6.0V 4.2 4.2 4.2 V

6.0V 1.2 1.2 1.2 V

IL

4.5V 4.5 4.4 4.4 4.4 V

6.0V 6.0 5.9 5.9 5.9 V

IL

IL

4.5V 0 0.1 0.1 0.1 V

6.0V 0 0.1 0.1 0.1 V

IL

b

12mW/§C from 65§Cto85§C Ceramic ‘‘J’’ Package:b12mW/§C from 100§Cto125§C

2

Operating Conditions

Supply Voltage (V
DC Input or Output Voltage 0 V

(V

IN,VOUT

Operating Temp. Range (T

MM74HC

)26V

CC

)

)

A

MM54HC

Maximum Input Rise and Fall Time
(Clear Input)

e

V

2.0V 1000 ns

CC

e

V

4.5V 500 ns

CC

e

V

6.0V 400 ns

CC

e

T

25§C

A

g

0.1

74HC 54HC

eb

T

40 to 85§CT

A

g

1.0

Min Max Units

b40a
b55a

eb

55 to 125§C

A

g

1.0 mA

CC

85§C

125§C

V

Units

V

V

AC Electrical Characteristics V

CC

5V, T

e

A

25§C, C

e

L

15 pF, t

e

r

e

Symbol Parameter Conditions Typ Limit Units

t

PLH

t

PHL

t

PHL

t

PLH

t

W

t

REM

t

WQ(MIN)

t

WQ

Maximum Trigger Propagation 22 33 ns
Delay, A, B to Q

Maximum Trigger Propagation 25 42 ns
Delay, A, B to Q

Maximum Propagation Delay, 20 27 ns
Clear to Q

Maximum Propagation Delay, 22 33 ns
Clear to Q

Minimum Pulse Width, A, B or 14 26 ns
Clear

Minimum Clear Removal Time 0 ns

Minimum Output Pulse Width C

Output Pulse Width C

e

28 pF 400 ns

EXT

e

2kX

R

EXT

e

1000 pF 10 ms

EXT

e

10 kX

R

EXT

e

t

6ns

f

AC Electrical Characteristics C

L

e

50 pF t

Symbol Parameter Conditions V

t

t

t

t

t

t

t

PLH

PHL

PHL

PLH

W

REM

WQ

Maximum Trigger Propagation 2.0V 77 169 194 210 ns
Delay, A or B to Q 4.5V 26 42 51 57 ns

Maximum Trigger Propagation 2.0V 88 197 229 250 ns
Delay, A or B to Q 4.5V 29 48 60 67 ns

Maximum Propagation 2.0V 54 114 132 143 ns
Delay, Clear to Q 4.5V 23 34 41 45 ns

Maximum Propagation 2.0V 56 116 135 147 ns
Delay, Clear to Q

Minimum Pulse Width 2.0V 57 123 144 157 ns
A, B, Clear 4.5V 17 30 37 42 ns

Minimum Clear 2.0V 0 0 0 0 ns
Removal Time 4.5V 0 0 0 0 ns

Output Pulse Width C

e

0.1 mF Min 5.0V 1 0.9 0.86 0.85 ms

EXT

e

10 kX

R

EXT

Max 5.0V 1 1.1 1.14 1.15 ms

t

TLH,tTHL

C

PD

C

IN

C

IN

Maximum Output Rise 2.0V 30 75 95 110 ns
and Fall Time 4.5V 8 15 19 22 ns

Power Dissipation 83 pF
Capacitance (Note 5)

Maximum Input 12 20 20 20 pF
Capacitance (Pins7&15)

Maximum Input 6 10 10 10 pF
Capacitance (other inputs)

Note 5: CPDdetermines the no load dynamic power consumption, P
ICC.

e

CPDV

D

e

e

6 ns (Unless otherwise specified)

t

r

f

CC

e

T

25§C

A

74HC 54HC

eb

T

40 to 85§CT

A

A

eb

55 to 125§C

Typ Guaranteed Limits

6.0V 21 32 39 44 ns

6.0V 24 38 46 51 ns

6.0V 19 28 33 36 ns

4.5V 25 36 42 46 ns

6.0V 20 29 34 37 ns

6.0V 12 21 27 30 ns

6.0V 0 0 0 0 ns

6.0V 7 13 16 19 ns

2

faICCVCC, and the no load dynamic current consumption, I

CC

e

S

CPDVCCf

Units

a

3