Datasheet

September 1993 9
Philips Semiconductors Product specification
Dual retriggerable precision monostable
multivibrator
74HC/HCT4538
NON-STANDARD DC CHARACTERISTICS FOR 74HCT
Voltages are referenced to GND (ground = 0 V)
Note
1. This measurement can only be carried out after a trigger pulse is applied.
AC WAVEFORMS
SYMBOL PARAMETER
T
amb
(°C)
UNIT
TEST CONDITIONS
74HCT
V
CC
(V)
V
I
(V)
OTHER
+25 −40 to +85 −40 to +125
min. typ max. min. max. min. max.
±I
I
input leakage current
nRC
EXT
0.5 5.0 10.0 µA 5.5 2.0
or
GND
V
CC
or GND;
note 1
Fig.8 Waveforms showing the input (nA
1
,nA
0
,nR
D
) to output (nQ, nQ) propagation delays, the output transition
times, the input and output pulse widths, the removal time from direct reset (nR
D
) to input (nA
1
,nA
0
), and
the input retrigger time.
(1) HC : V
M
= 50%; V
I
= GND to V
CC
.
HCT: V
M
= 1.3 V; V
I
= GND to 3 V.