74HC4538N Просмотр технического описания (PDF) - NXP Semiconductors.

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производитель

74HC4538N

Dual retriggerable precision monostable multivibrator

NXP Semiconductors. 

NXP Semiconductors

74HC4538; 74HCT4538

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 re-triggering (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_3

Product data sheet

Rev. 03 — 8 June 2009

© NXP B.V. 2009. All rights reserved.

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