Datasheet

7
HCT TYPES
Maximum CP Frequency f
MAX
- 4.5 30 - - 24 - 20 - MHz
CP Width (Low) (Note 6) t
W(L)
- 4.5 16 - - 20 - 24 - ns
MR Pulse Width (161) t
W
- 4.5 20 - - 25 - 30 - ns
Setup Time, Pn to CP t
SU
- 4.5 10 - - 13 - 15 - ns
Setup Time, PE or TE to CP t
SU
- 4.5 13 - - 16 - 20 - ns
Setup Time, SPE to CP t
SU
- 4.5 12 - - 15 - 18 - ns
Setup Time, MR to CP (163) t
SU
- 4.5 13 - - 16 - 20 - ns
Hold Time, PN to CP t
H
- 4.5 5 - - 5 - 5 - ns
Hold Time, TE or PE to CP t
H
- 4.5 3 - - 3 - 3 - ns
Hold Time, SPE to CP t
H
- 4.5 3 - - 3 - 3 - ns
Recovery Time, MR to CP (161) t
REC
- 4.5 15 - - 19 - 22 - ns
NOTE:
6. Applies to non-cascaded operation only. With cascaded counters clock to terminal count propagation delays, count enables (PE or TE)-
to-clock setup times, and count enables (PE or TE)-to-clock hold times determine maximum clock frequency. For example with these HC
devices:
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
PHL
, t
PLH
C
L
= 50pF
CP to TC 2 - - 185 - 230 - 280 ns
4.5 - - 37 - 46 - 56 ns
C
L
= 15pF 5 - 15 - - - - - ns
C
L
= 50pF 6 - - 31 - 39 - 48 ns
CP to Qn t
PHL,
t
PLH
C
L
= 50pF 2 - - 185 - 230 - 280 ns
4.5 - - 37 - 46 - 56 ns
C
L
= 15pF 5 - 15 - - - - - ns
C
L
= 50pF 6 - - 31 - 39 - 48 ns
TE to TC t
PHL,
t
PLH
C
L
= 50pF 2 - - 120 - 150 - 180 ns
4.5 - - 24 - 30 - 36 ns
C
L
= 15pF 5 - 9 - - - - - ns
C
L
= 50pF 6 - - 20 - 26 - 31 ns
Prerequisite For Switching Specifications (Continued)
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
f
MAX
(CP)
1
CP-to-TC prop. delay TE-to-CP setup TE-to-CP Hold++
-----------------------------------------------------------------------------------------------------------------------------------------------------
1
37 10 0++
-----------------------------
21MHz min()≈==
CD54/74HC161, CD54/74HCT161, CD54/74HC163, CD54/74HCT163