74HC4538 datasheet(8/13 Pages) PHILIPS

Il numero della parte	74HC4538

Spiegazioni elettronici	Dual retriggerable precision monostable multivibrator

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Produttore elettronici	PHILIPS [NXP Semiconductors]

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8 / 13 page

September 1993

8

Philips Semiconductors

Product speciﬁcation

Dual retriggerable precision monostable

multivibrator

74HC/HCT4538

DC CHARACTERISTICS FOR 74HCT

For the DC characteristics see

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

Output capability: standard

ICC category: MSI

Note to HCT types

The value of additional quiescent supply current (

∆ICC) for a unit load of 1 is given in the family specifications.

To determine

∆ICC per input, multiply this value by the unit load coefficient shown in the table below.

AC CHARACTERISTICS FOR 74HCT

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

INPUT

UNIT LOAD COEFFICIENT

nA0,nA1

nRD

0.50

0.65

SYMBOL

PARAMETER

Tamb (°C)

UNIT

TEST CONDITIONS

74HCT

VCC

(V)

OTHER

+25

−40 to +85

−40 to +125

min.

typ.

max.

min.

max.

min.

max.

tPLH

propagation delay

nA0,nA1 to nQ

35

60

75

90

ns

4.5

Fig.8

tPHL

propagation delay

nA0,nA1 to nQ

35

60

75

90

ns

4.5

Fig.8

tPHL

propagation delay

nRD to nQ

35

60

75

90

ns

4.5

Fig.8

tPLH

propagation delay

nRD to nQ

35

60

75

90

ns

4.5

Fig.8

tTHL/ tTLH

output transition time

7

15

19

21

ns

4.5

Fig.8

tW

nA0 pulse width

LOW

20

11

25

30

ns

4.5

Fig.8

tW

nA1 pulse width

HIGH

16

5

20

24

ns

4.5

Fig.8

tW

nRD pulse width

LOW

20

11

25

30

ns

4.5

Fig.8

tW

nQ, nQ pulse width

HIGH or LOW

0.63 0.70

0.77

0.602 0.798 0.595 0.805 ms

5.0

Fig.8; Rt = 10 kΩ;

Ct = 0.1 µF

trem

removal time

RD to nA0, nA1

7

2

9

11

ns

4.5

Fig.8

trt

retrigger time

nA0,nA1

−

80+X

−−

ns

4.5

Fig.8

X=CEXT /

(4.5

× VCC)

REXT

external timing

resistor

2

1000

k

Ω

5.0

CEXT

external timing

capacitor

no limits

pF

5.0

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