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74HC670DB Datasheet, PDF (5/9 Pages) NXP Semiconductors – 4 x 4 register file 3-state
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Philips Semiconductors
4 x 4 register file; 3-state
Product specification
74HC/HCT670
DC CHARACTERISTICS FOR 74HC
For the DC characteristics see “74HC/HCT/HCU/HCMOS Logic Family Specifications”.
Output capability: bus driver
ICC category: MSI
AC CHARACTERISTICS FOR 74HC
GND = 0 V; tr = tf = 6 ns; CL = 50 pF
Tamb (°C)
TEST CONDITIONS
SYMBOL
PARAMETER
74HC
+25
−40 to +85
−40 to+125
UNIT
VCC
(V)
WAVEFORMS
min. typ. max. min. max. min. max.
tPHL/ tPLH propagation delay
RA, RB to Qn
58 195
245
295 ns
21 39
49
59
17 33
42
50
tPHL/ tPLH propagation delay
WE to Qn
77 250
315
375 ns
28 50
63
75
22 43
54
64
tPHL/ tPLH propagation delay
Dn to Qn
74 250
315
375 ns
27 50
63
75
22 43
54
64
tPZH/ tPZL 3-state output enable time
39 150
190
225 ns
RE to Qn
14 30
38
45
11 26
33
38
tPHZ/ tPLZ 3-state output disable time
47 150
190
225 ns
RE to Qn
17 30
38
45
14 26
33
38
tTHL/ tTLH output transition time
14 60
75
90 ns
5 12
15
18
4 10
13
15
tW
write enable pulse width 80 14
100
120
ns
LOW
16 5
20
24
14 4
17
20
tsu
set-up time
Dn to WE
60 3
75
90
ns
12 1
15
18
10 1
13
15
tsu
set-up time
WA, WB to WE
60 6
75
90
ns
12 2
15
18
10 2
13
15
th
hold time
Dn to WE
50
5
5
ns
50
5
5
50
5
5
th
hold time
50
5
5
ns
WA, WB to WE
50
5
5
50
5
5
tlatch
latch time
WE to RA, RB
100 28
125
150
ns
20 10
25
30
17 8
21
26
2.0 Fig.6
4.5
6.0
2.0 Fig.7
4.5
6.0
2.0 Fig.7
4.5
6.0
2.0 Fig.9
4.5
6.0
2.0 Fig.9
4.5
6.0
2.0 Fig.6
4.5
6.0
2.0 Fig.8
4.5
6.0
2.0 Fig.8
4.5
6.0
2.0 Fig.8
4.5
6.0
2.0 Fig.8
4.5
6.0
2.0 Fig.8
4.5
6.0
2.0 Fig.8
4.5
6.0
December 1990
5
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