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CD54HCT161 Datasheet(PDF) 3 Page - Texas Instruments

Part No. CD54HCT161
Description  High-Speed CMOS Logic Presettable Counters
Download  19 Pages
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Maker  TI [Texas Instruments]
Homepage  http://www.ti.com
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CD54HCT161 Datasheet(HTML) 3 Page - Texas Instruments

 
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3
MODE SELECT - FUNCTION TABLE FOR ’HC161 AND ’HCT161
OPERATING MODE
INPUTS
OUTPUTS
MR
CP
PE
TE
SPE
Pn
Qn
TC
Reset (Clear)
L
XXXXX
L
L
Parallel Load
H
XX
l
l
L
L
H
X
X
l
h
H
(Note 1)
Count
H
h
h
h (Note 3)
X
Count
(Note 1)
Inhibit
H
X
I (Note 2)
X
h (Note 3)
X
qn
(Note 1)
H
X
X
I (Note 2)
h (Note 3)
X
qn
L
MODE SELECT - FUNCTION TABLE FOR ’HC163 AND ’HCT163
OPERATING MODE
INPUTS
OUTPUTS
MR
CP
PE
TE
SPE
Pn
Qn
TC
Reset (Clear)
l
XXXX
L
L
Parallel Load
h (Note 3)
XX
l
l
L
L
h (Note 3)
X
X
l
h
H
(Note 1)
Count
h (Note 3)
h
h
h (Note 3)
X
Count
(Note 1)
Inhibit
h (Note 3)
X
I (Note 2)
X
h (Note 3)
X
qn
(Note 1)
h (Note 3)
X
X
I (Note 2)
h (Note 3)
X
qn
L
H = High voltage level steady state; L = Low voltage level steady state; h = High voltage level one setup time prior to the Low-to-High clock
transition; l = Low voltage level one setup time prior to the Low-to-High clock transition; X = Don’t Care; q = Lower case letters indicate the
state of the referenced output prior to the Low-to-High clock transition;
↑ = Low-to-High clock transition.
NOTES:
1. The TC output is High when TE is High and the counter is at Terminal Count (HHHH for HC/HCT161 and ’HC/HCT163).
2. The High-to-Low transition of PE or TE on the ’HC/HCT161 and the ’HC/HCT163 should only occur while CP is HIGH for conventional
operation.
3. The Low-to-High transition of SPE on the ’HC/HCT161 and SPE or MR on the ’HC/HCT163 should only occur while CP is HIGH for
conventional operation.
CD54/74HC161, CD54/74HCT161, CD54/74HC163, CD54/74HCT163


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