Datasheet

December 1990 7
Philips Semiconductors Product specification
8-bit addressable latch 74HC/HCT259
DC CHARACTERISTICS FOR 74HC
For the DC characteristics see “74HC/HCT/HCU/HCMOS Logic Family Specifications” .
Output capability: standard
I
CC
category: MSI
AC CHARACTERISTICS FOR 74HC
GND = 0 V; t
r
=t
f
= 6 ns; C
L
= 50 pF
SYMBOL PARAMETER
T
amb
(°C)
UNIT
TEST CONDITIONS
74HC
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
58
21
17
185
37
31
230
46
39
280
56
48
ns 2.0
4.5
6.0
Fig.7
t
PHL
/ t
PLH
propagation delay
A
n
to Q
n
58
21
17
185
37
31
230
46
39
280
56
48
ns 2.0
4.5
6.0
Fig.8
t
PHL
/ t
PLH
propagation delay
LE to Q
n
55
20
16
170
34
29
215
43
37
255
51
43
ns 2.0
4.5
6.0
Fig.6
t
PHL
propagation delay
MR to Q
n
50
18
14
155
31
26
195
39
33
235
47
40
ns 2.0
4.5
6.0
Fig.9
t
THL
/ t
TLH
output transition time 19
7
6
75
15
13
95
19
16
119
22
19
ns 2.0
4.5
6.0
Figs 6 and 7
t
W
LE pulse width
HIGH or LOW
70
14
12
17
6
5
90
18
15
105
21
18
ns 2.0
4.5
6.0
Fig.6
t
W
MR pulse width
LOW
70
14
12
17
6
5
90
18
15
105
21
18
ns 2.0
4.5
6.0
Fig.9
t
su
set-up time
D, A
n
to LE
80
16
14
19
7
6
100
20
17
120
24
20
ns 2.0
4.5
6.0
Figs 10 and 11
t
h
hold time
D to LE
0
0
0
−19
−6
−5
0
0
0
0
0
0
ns 2.0
4.5
6.0
Fig.10
t
h
hold time
A
n
to LE
2
2
2
−11
−4
−3
2
2
2
2
2
2
ns 2.0
4.5
6.0
Fig.11