74HC4538D-Q100 データシートの表示（PDF） - NXP Semiconductors.

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74HC4538D-Q100

Dual retriggerable precision monostable multivibrator

NXP Semiconductors. 

NXP Semiconductors

74HC4538-Q100; 74HCT4538-Q100

Dual retriggerable precision monostable multivibrator

6. Functional description

Table 3.

Inputs

nA



Function table

nB

L

nCD

H

Outputs

nQ

nQ

H



H

X

X

L

L

H

[1] H = HIGH voltage level; L = LOW voltage level; X = don’t care;

 = positive-going transition;  = negative-going transition;

= one HIGH level output pulse, with the pule width determined by CEXT and REXT;

= one LOW level output pulse, with the pulse width determined by CEXT and REXT.

(1)

nB input

(3)

nA input

nCD input

nREXT/CEXT input

Vref1

Vref2

nQ output

T

T

(5)

(1) Positive edge triggering.

(2) Positive edge retriggering (pulse lengthening).

(3) Negative edge triggering.

(4) Reset (pulse shortening).

(5) T = 0.7  REXT  CEXT (see also Figure 6).

Fig 5. Timing diagram

(1)

(2)

(1)

(4)

Vref1

Vref2

T

001aae737

74HC_HCT4538_Q100

Product data sheet

All information provided in this document is subject to legal disclaimers.

Rev. 1 — 2 August 2012

© NXP B.V. 2012. All rights reserved.

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