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74HC670DB Datasheet, PDF (7/9 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
AC CHARACTERISTICS FOR 74HCT
GND = 0 V; tr = tf = 6 ns; CL = 50 pF
Tamb (°C)
TEST CONDITIONS
SYMBOL
PARAMETER
74HCT
+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
21 40
50
60 ns 4.5 Fig.6
tPHL/ tPLH propagation delay
WE to Qn
28 50
63
75 ns 4.5 Fig.7
tPHL/ tPLH propagation delay
Dn to Qn
27 50
63
75 ns 4.5 Fig.7
tPZH/ tPZL 3-state output enable time
18 35
44
53 ns 4.5 Fig.9
RE to Qn
tPHZ/ tPLZ 3-state output disable time
19 35
44
53 ns 4.5 Fig.9
RE to Qn
tTHL/ tTLH output transition time
5 12
15
18 ns 4.5 Fig.6
tW
write enable pulse width 18 9
LOW
23
27
tsu
set-up time
Dn to WE
tsu
set-up time
WA, WB to WE
th
hold time
Dn to WE
th
hold time
WA, WB to WE
tlatch
latch time
WE to RA, RB
12 4
15
18
12 −2
15
18
5 −1
5
5
50
5
5
25 11
31
38
ns 4.5 Fig.8
ns 4.5 Fig.8
ns 4.5 Fig.8
ns 4.5 Fig.8
ns 4.5 Fig.8
ns 4.5 Fig.8
December 1990
7
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