Datasheet

December 1990 9
Philips Semiconductors Product specification
8-bit addressable latch 74HC/HCT259
AC CHARACTERISTICS FOR 74HCT
GND = 0 V; t
r
=t
f
= 6 ns; C
L
= 50 pF
SYMBOL PARAMETER
T
amb
(°C)
UNIT
TEST CONDITIONS
74HCT
V
CC
(V)
WAVEFORMS
+25 −40 TO +85 −40 TO +125
min. typ. max. min. max. min. max.
t
PHL
/ t
PLH
propagation delay
D to Q
n
23 39 49 59 ns 4.5 Fig.7
t
PHL
/ t
PLH
propagation delay
A
n
to Q
n
25 41 51 62 ns 4.5 Fig.8
t
PHL
/ t
PLH
propagation delay
LE to Q
n
22 38 48 57 ns 4.5 Fig.6
t
PHL
propagation delay
MR to Q
n
23 39 49 59 ns 4.5 Fig.9
t
THL
/ t
TLH
output transition time 7 15 19 22 ns 4.5 Figs 6 and 7
t
W
LE pulse width
LOW
19 11 24 29 ns 4.5 Fig.6
t
W
MR pulse width
LOW
18 10 23 27 ns 4.5 Fig.9
t
su
set-up time
D to LE
17 10 21 26 ns 4.5 Fig.10
t
su
set-up time
A
n
to LE
17 10 21 26 ns 4.5 Fig.11
t
h
hold time
D to LE
0 −8 0 0 ns 4.5 Fig.10
t
h
hold time
A
n
to LE
0 −4 0 0 ns 4.5 Fig.11