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| 74HC4538 Datasheet, PDF (9/13 Pages) NXP Semiconductors – Dual retriggerable precision monostable multivibrator | |||
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Philips Semiconductors
Dual retriggerable precision monostable
multivibrator
Product speciï¬cation
74HC/HCT4538
NON-STANDARD DC CHARACTERISTICS FOR 74HCT
Voltages are referenced to GND (ground = 0 V)
Tamb (°C)
TEST CONDITIONS
SYMBOL
PARAMETER
74HCT
+25
â40 to +85
â40 to +125
UNIT
VCC
(V)
VI
(V)
min. typ max. min. max. min. max.
OTHER
±II
input leakage current
nRCEXT
0.5
5.0
10.0 µA
5.5 2.0 VCC or GND;
or note 1
GND
Note
1. This measurement can only be carried out after a trigger pulse is applied.
AC WAVEFORMS
(1) HC : VM = 50%; VI = GND to VCC.
HCT: VM = 1.3 V; VI = GND to 3 V.
Fig.8 Waveforms showing the input (nA1, nA0, nRD) to output (nQ, nQ) propagation delays, the output transition
times, the input and output pulse widths, the removal time from direct reset (nRD) to input (nA1, nA0), and
the input retrigger time.
September 1993
9
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