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74HC/HCT4538 датащи(PDF) 4 Page - NXP Semiconductors

номер детали 74HC/HCT4538
подробное описание детали  Dual retriggerable precision monostable multivibrator
PDF  13 Pages
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производитель  PHILIPS [NXP Semiconductors]
домашняя страница  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

74HC/HCT4538 датащи(HTML) 4 Page - NXP Semiconductors

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September 1993
4
Philips Semiconductors
Product specification
Dual retriggerable precision monostable
multivibrator
74HC/HCT4538
Fig.4 Functional diagram.
Fig.5
Connection of the external timing
components Rt and Ct.
(1) Connect CTC (pins 1 and 15) to GND (pin 8).
FUNCTION TABLE
Notes
1. H = HIGH voltage level
L = LOW voltage level
X = don’t care
↑ = LOW-to-HIGH transition
↓ = HIGH-to-LOW transition
= one HIGH level output pulse
= one LOW level output pulse
INPUTS
OUTPUTS
nA0
nA1
nRD
nQ
nQ
↓
LH
H
↑
H
XX
L
L
H
Fig.6 Timing diagram.
(1) Positive edge triggering.
(2) Positive edge retriggering (pulse
lengthening).
(3) Negative edge triggering.
(4) Reset (pulse shortening).
(5) Vref1 and Vref2 are internal reference voltages.
(6) T = 0.7
× Rt × Ct (see also Fig.5).



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