74HC423D datasheet(6/14 Pages) PHILIPS

Teilenummer	74HC423D

Bauteilbeschribung	Dual retriggerable monostable multivibrator with reset

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Hersteller	PHILIPS [NXP Semiconductors]

Direct Link	http://www.nxp.com

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6 / 14 page

1998 Jul 08

6

Philips Semiconductors

Product speciﬁcation

Dual retriggerable monostable

multivibrator with reset

74HC/HCT423

DC CHARACTERISTICS FOR 74HC

For the DC characteristics see

“74HC/HCT/HCU/HCMOS Logic Family Specifications”.

Output capability: standard (except for nREXT /CEXT)

ICC category: MSI

AC CHARACTERISTICS FOR 74HC

GND = 0 V; tr = tf = 6 ns; CL = 50 pF

SYMBOL

PARAMETER

Tamb (°C)

UNIT

TEST CONDITIONS

74HC

VCC

(V)

WAVEFORMS/

NOTES

+25

−40 to +85 −40 to +125

min. typ. max

min max min.

max.

tPHL/ tPLH

propagation delay

nA, nB to nQ, nQ

80

255

320

385

ns

2.0

CEXT = 0 pF;

REXT =5 kΩ

29

51

64

77

4.5

23

43

54

65

6.0

tPHL/ tPLH

propagation delay

nRD to nQ, nQ

66

215

270

325

ns

2.0

CEXT = 0 pF;

REXT =5 kΩ

24

43

54

65

4.5

19

37

46

55

6.0

tTHL/ tTLH

output transition time

19

75

95

110

ns

2.0

7

15

19

22

4.5

6

13

16

19

6.0

tW

trigger pulse width

nA = LOW

100

11

125

150

ns

2.0

Fig.7

20

4

25

30

4.5

17

3

21

26

6.0

tW

trigger pulse width

nB = HIGH

100

17

125

150

ns

2.0

Fig.7

20

6

25

30

4.5

17

5

21

26

6.0

tW

reset pulse width

nRD = LOW

100

14

125

150

ns

2.0

Fig.8

20

5

25

30

4.5

17

4

21

26

6.0

tW

output pulse width

nQ = HIGH

nQ = LOW

450

−−

µs

5.0

CEXT = 100 nF;

REXT = 10 kΩ;

Figs 7 and 8

tW

output pulse width

nQ = HIGH

nQ = LOW

75

−−

ns

5.0

CEXT = 0 pF;

REXT =5 kΩ;

note 1;

Figs 7 and 8

trt

retrigger time

nA, nB

110

−−

ns

5.0

CEXT = 0 pF;

REXT =5 kΩ;

note 2; Fig. 7

REXT

external timing resistor

10

2

1000

−−

k

Ω

2.0

5.0

Fig.9

CEXT

external timing capacitor

no limits

pF

5.0

Fig.9; note 3

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