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CD54HCT161 Datasheet, PDF (7/16 Pages) Texas Instruments – High-Speed CMOS Logic Presettable Counters
◁
CD54/74HC161, CD54/74HCT161, CD54/74HC163, CD54/74HCT163
Prerequisite For Switching Specifications (Continued)
PARAMETER
TEST
VCC
25oC
-40oC TO 85oC -55oC TO 125oC
SYMBOL CONDITIONS (V) MIN TYP MAX MIN MAX MIN MAX UNITS
HCT TYPES
Maximum CP Frequency
fMAX
-
4.5 30 -
-
24
-
20
-
MHz
CP Width (Low) (Note 6)
tW(L)
-
4.5 16 -
-
20
-
24
-
ns
MR Pulse Width (161)
tW
-
4.5 20 -
-
25
-
30
-
ns
Setup Time, Pn to CP
tSU
-
4.5 10 -
-
13
-
15
-
ns
Setup Time, PE or TE to CP
tSU
-
4.5 13 -
-
16
-
20
-
ns
Setup Time, SPE to CP
tSU
-
4.5 12 -
-
15
-
18
-
ns
Setup Time, MR to CP (163)
tSU
-
4.5 13 -
-
16
-
20
-
ns
Hold Time, PN to CP
tH
-
4.5 5 -
-
5
-
5
-
ns
Hold Time, TE or PE to CP
tH
-
4.5 3 -
-
3
-
3
-
ns
Hold Time, SPE to CP
tH
-
4.5 3 -
-
3
-
3
-
ns
Recovery Time, MR to CP (161) tREC
-
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:
fMAX (CP) = C-----P-------t--o------T----C------p---r--o---p----.---d---e----l-a---y-----+-----T---E-------t-1-o------C-----P-----s---e----t-u----p-----+----T----E-------t--o------C----P------H----o----l-d-- = 3----7-----+-----11---0-----+-----0- ≈ 21MHz(min)
Switching Specifications CL = 50pF, Input tr, tf = 6ns
PARAMETER
HC TYPES
Propagation Delay
CP to TC
TEST
SYMBOL CONDITIONS VCC (V) MIN
tPHL, tPLH CL = 50pF
2
-
25oC
TYP MAX
- 185
-40oC TO
85oC
MIN MAX
-
230
4.5
-
-
37
-
46
CP to Qn
CL = 15pF
5
CL = 50pF
6
tPHL, tPLH CL = 50pF
2
4.5
-
15
-
-
-
-
-
31
-
39
-
-
185
-
230
-
-
37
-
46
TE to TC
CL = 15pF
5
CL = 50pF
6
tPHL, tPLH CL = 50pF
2
4.5
-
15
-
-
-
-
-
31
-
39
-
-
120
-
150
-
-
24
-
30
CL = 15pF
5
-
9
-
-
-
CL = 50pF
6
-
-
20
-
26
-55oC TO
125oC
MIN MAX UNITS
-
280 ns
-
56
ns
-
-
ns
-
48
ns
-
280 ns
-
56
ns
-
-
ns
-
48
ns
-
180 ns
-
36
ns
-
-
ns
-
31
ns
7
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