74hct4538 NXP Semiconductors, 74hct4538 Datasheet - Page 4

• Manufacturer Part Number: 74hct4538
• Description: Dual Retriggerable Precision Monostable Multivibrator
• Manufacturer: NXP Semiconductors

Philips Semiconductors
September 1993
Dual retriggerable precision monostable
multivibrator
(1) Connect C
(1) Positive edge triggering.
(2) Positive edge retriggering (pulse
(3) Negative edge triggering.
(4) Reset (pulse shortening).
(5) V
(6) T = 0.7
Fig.5
lengthening).
ref1
and V
TC
Fig.4 Functional diagram.
R
Connection of the external timing
components R
ref2
(pins 1 and 15) to GND (pin 8).
t
C
are internal reference voltages.
t
(see also Fig.5).
t
and C
t
.
Fig.6 Timing diagram.
4
FUNCTION TABLE
Notes
1. H = HIGH voltage level
nA
H
X
0
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
nA
L
X
INPUTS
1
nR
H
H
L
D
74HC/HCT4538
nQ
L
Product specification
OUTPUTS
nQ
H