December 1990 5
Philips Semiconductors Product specification
4 x 4 register file; 3-state 74HC/HCT670
DC CHARACTERISTICS FOR 74HC
For the DC characteristics see
“74HC/HCT/HCU/HCMOS Logic Family Specifications”
.
Output capability: bus driver
I
CC
category: MSI
AC CHARACTERISTICS FOR 74HC
GND = 0 V; t
r
=t
f
= 6 ns; C
L
=50pF
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
R
A
, R
B
to Q
n
58
21
17
195
39
33
245
49
42
295
59
50
ns 2.0
4.5
6.0
Fig.6
t
PHL
/ t
PLH
propagation delay
WE to Q
n
77
28
22
250
50
43
315
63
54
375
75
64
ns 2.0
4.5
6.0
Fig.7
t
PHL
/ t
PLH
propagation delay
D
n
to Q
n
74
27
22
250
50
43
315
63
54
375
75
64
ns 2.0
4.5
6.0
Fig.7
t
PZH
/ t
PZL
3-state output enable time
RE to Q
n
39
14
11
150
30
26
190
38
33
225
45
38
ns 2.0
4.5
6.0
Fig.9
t
PHZ
/ t
PLZ
3-state output disable time
RE to Q
n
47
17
14
150
30
26
190
38
33
225
45
38
ns 2.0
4.5
6.0
Fig.9
t
THL
/ t
TLH
output transition time 14
5
4
60
12
10
75
15
13
90
18
15
ns 2.0
4.5
6.0
Fig.6
t
W
write enable pulse width
LOW
80
16
14
14
5
4
100
20
17
120
24
20
ns 2.0
4.5
6.0
Fig.8
t
su
set-up time
D
n
to WE
60
12
10
3
1
1
75
15
13
90
18
15
ns 2.0
4.5
6.0
Fig.8
t
su
set-up time
W
A
, W
B
to WE
60
12
10
6
2
2
75
15
13
90
18
15
ns 2.0
4.5
6.0
Fig.8
t
h
hold time
D
n
to WE
5
5
5
0
0
0
5
5
5
5
5
5
ns 2.0
4.5
6.0
Fig.8
t
h
hold time
W
A
, W
B
to WE
5
5
5
0
0
0
5
5
5
5
5
5
ns 2.0
4.5
6.0
Fig.8
t
latch
latch time
WE to R
A
, R
B
100
20
17
28
10
8
125
25
21
150
30
26
ns 2.0
4.5
6.0
Fig.8
