Datasheet

5
Prerequisite for Switching Specifications
PARAMETER SYMBOL V
CC
(V)
25
o
C -40
o
C TO 85
o
C -55
o
C TO 125
o
C
UNITSMIN TYP MAX MIN TYP MAX MIN TYP MAX
HC TYPES
Setup Time
Data to WE
Write to WE
t
SU
, t
h
260- -75- -90- -ns
4.5 12 - - 15 - - 18 - - ns
610- -13- -15- -ns
Hold Time
Data to WE
Write to WE
t
H
, t
W
25--5--5--ns
4.5 5 - - 5 - - 5 - - ns
65--5--5--ns
Pulse Width WE t
W
2 80 - - 100 - - 120 - - ns
4.5 16 - - 20 - - 24 - - ns
614- -17- -20- -ns
Latch Time WE to RA0,
RA1
t
LATCH
2 100 - - 125 - - 150 - - ns
4.5 20 - - 25 - - 30 - - ns
617- -21- -26- -ns
HCT TYPES
Setup Time
Data to WE
t
SU
, t
h
4.5 12 - - 15 - - 18 - - ns
Hold Time
Data to WE
Write to WE
t
H
, t
W
4.5 5 - - 5 - - 5 - - ns
Setup Time
Write to WE
t
SU
4.5 18 - - 23 - - 27 - - ns
Pulse Width WE t
W
4.5 20 - - 25 - - 30 - - ns
Latch Time WE to RA0,
RA1
t
LATCH
4.5 25 - - 31 - - 38 - - ns
Switching Specifications C
L
= 50pF, Input t
r
, t
f
= 6ns
PARAMETER SYMBOL
TEST
CONDITIONS V
CC
(V)
25
o
C
-40
o
C TO
85
o
C
-55
o
C TO
125
o
C
UNITSMIN TYP MAX MIN MAX MIN MAX
HC TYPES
Propagation Delay t
PLH
, t
PHL
C
L
= 50pF
Reading Any Word 2 - - 195 - 245 - 295 ns
4.5 - - 39 - 49 - 59 ns
C
L
= 15pF 5 - 16 - - - - - ns
C
L
= 50pF 6 - - 33 - 42 - 50 ns
Write Enable to Output t
PLH
,t
PHL
C
L
= 50pF 2 - - 250 - 315 - 375 ns
4.5 - - 50 - 63 - 75 ns
C
L
= 15pF 5 - 21 - - - - - ns
C
L
= 50pF 6 - - 43 - 54 - 64 ns
CD54HC670, CD74HC670, CD74HCT670CD54HC670, CD74HC670, CD74HCT670