Datasheet

September 1993 14
Philips Semiconductors Product specification
Programmable delay timer with oscillator 74HC/HCT5555
AC CHARACTERISTICS FOR 74HCT
GND = 0 V; t
r
= t
f
= 6 ns; C
L
= 50 pF.
SYMBOL PARAMETER
T
amb
(°C)
UNIT
TEST CONDITION
+25 −40 to +85 −40 to +125
V
CC
(V)
WAVEFORMS
MIN TYP MAX MIN MAX MIN MAX
t
PLH
/t
PHL
propagation
delay A, B to
Q, Q
− 28 48 − 60 − 72 ns 4.5 Fig.6
t
PHL
/t
PLH
propagation
delay MR to Q,
Q
− 24 41 − 51 − 62 ns 4.5 Fig.7
t
PHL
/t
PLH
propagation
delay RS to Q,
Q
− 32 54 − 68 − 81 ns 4.5 Fig.8; note 1
t
THL
/t
TLH
output
transition time
− 715−19 − 22 ns 4.5 Fig.6
t
W
trigger pulse
width
A = HIGH
B = LOW
21 12 − 26 − 32 − ns 4.5 Fig.6
t
W
master reset
pulse width
HIGH
14 5 − 18 − 21 − ns 4.5 Fig.7
t
W
clock pulse
width RS;
HIGH or LOW
16 9 − 20 − 24 − ns 4.5 Fig.8
t
W
minimum
output pulse
width
Q = HIGH,
Q = LOW
− 100 −−−−−ns 4.5 Fig.6
t
rt
retrigger time
A, B
− 0 −−−−−ns 4.5 Fig.10; note 2
R
EXT
external timing
resistor
1 − 1000 −−−−kΩ4.5 Fig.13
C
EXT
external timing
capacitor
50 no limits pF 4.5 Fig.13
t
rem
removal time
MR to A, B
24 14 − 30 − 36 − ns 4.5 Fig.7
f
max
maximum
clock pulse
frequency
10 18 − 8 − 6.6 − MHz 4.5 Fig.8; note 3
f
max
maximum
clock pulse
frequency
30 75 − 24 − 20 − MHz 4.5 Fig.9; note 4