74HCT4538N 데이터 시트보기 (PDF) - NXP Semiconductors.

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74HCT4538N

Dual retriggerable precision monostable multivibrator

NXP Semiconductors. 

NXP Semiconductors

74HC4538; 74HCT4538

Dual retriggerable precision monostable multivibrator

Table 7. Dynamic characteristics …continued

Voltages are referenced to GND (ground = 0 V); for test circuit see Figure 9.

Symbol Parameter Conditions

25 °C

−40 °C to

+85 °C

Min Typ[1] Max Min Max

74HCT4538

tPLH

LOW to HIGH nA, nB to nQ;

propagation see Figure 7

delay

VCC = 4.5 V

VCC = 5.0 V; CL = 15 pF

nCD to nQ; see Figure 7

-

35

60

-

75

-

30

-

-

-

VCC = 4.5 V

tPHL

HIGH to LOW nA, nB to nQ;

propagation see Figure 7

delay

VCC = 4.5 V

VCC = 5.0 V; CL = 15 pF

nCD to nQ; see Figure 7

-

35

60

-

75

-

35

60

-

75

-

30

-

-

-

VCC = 4.5 V

-

35

60

-

75

tt

transition time nQ and nQ; see Figure 7 [2]

VCC = 4.5 V

-

7

15

-

19

tW

pulse width nA LOW; see Figure 8

VCC = 4.5 V

20

11

-

25

-

nB HIGH; see Figure 8

VCC = 4.5 V

nCD LOW; see Figure 8

16

5

-

20

-

VCC = 4.5 V

nQ and nQ HIGH or LOW;

see Figure 8

20

11

-

25

-

VCC = 5.0 V;

CEXT = 0.1 µF;

REXT = 10 kΩ

trec

recovery time nCD to nA, nB;

see Figure 8

630 700 770 602 798

trtrig

REXT

VCC = 4.5 V

retrigger time nA, nB; see Figure 8;

X = CEXT / (4.5 × VCC)

VCC = 4.5 V

external timing VCC = 5.0 V

resistor

7

2

-

9

-

- 80 + X -

-

-

2

-

1000 -

-

CEXT

external timing VCC = 5.0 V

capacitor

no limits

−40 °C to Unit

+125 °C

Min Max

-

90 ns

-

- ns

-

90 ns

-

90 ns

-

- ns

-

90 ns

-

21 ns

30

- ns

24

- ns

30

- ns

595 805 µs

11

- ns

-

- ns

-

- kΩ

74HC_HCT4538_3

Product data sheet

Rev. 03 — 8 June 2009

© NXP B.V. 2009. All rights reserved.

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