Philips Semiconductors
Product specification
4 x 4 register file; 3-state
DC CHARACTERISTICS FOR 74HC
74HC/HCT670
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; tr = tf = 6 ns; CL = 50 pF
Tamb (°C)
TEST CONDITIONS
74HC
SYMBOL
PARAMETER
UNIT
VCC
(V)
+25
−40 to +85 −40 to+125
WAVEFORMS
min. typ. max. min. max. min. max.
t
PHL/ tPLH propagation delay
58
21
17
195
39
33
245
49
42
295
59
50
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
2.0 Fig.6
4.5
6.0
RA, RB to Qn
tPHL/ tPLH propagation delay
WE to Qn
77
28
22
250
50
43
315
63
54
375
75
64
2.0 Fig.7
4.5
6.0
t
PHL/ tPLH propagation delay
Dn to Qn
74
27
22
250
50
43
315
63
54
375
75
64
2.0 Fig.7
4.5
6.0
tPZH/ tPZL 3-state output enable time
RE to Qn
39
14
11
150
30
26
190
38
33
225
45
38
2.0 Fig.9
4.5
6.0
t
t
PHZ/ tPLZ 3-state output disable time
RE to Qn
47
17
14
150
30
26
190
38
33
225
45
38
2.0 Fig.9
4.5
6.0
THL/ tTLH output transition time
14
5
4
60
12
10
75
15
13
90
18
15
2.0 Fig.6
4.5
6.0
tW
tsu
tsu
th
write enable pulse width
LOW
80
16
14
14
5
4
100
20
17
120
24
20
2.0 Fig.8
4.5
6.0
set-up time
Dn to WE
60
12
10
3
1
1
75
15
13
90
18
15
2.0 Fig.8
4.5
6.0
set-up time
WA, WB to WE
60
12
10
6
2
2
75
15
13
90
18
15
2.0 Fig.8
4.5
6.0
hold time
Dn to WE
5
5
5
0
0
0
5
5
5
5
5
5
2.0 Fig.8
4.5
6.0
th
hold time
WA, WB to WE
5
5
5
0
0
0
5
5
5
5
5
5
2.0 Fig.8
4.5
6.0
tlatch
latch time
WE to RA, RB
100 28
125
25
21
150
30
26
2.0 Fig.8
4.5
6.0
20
17
10
8
December 1990
5