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DM74LS169A Datasheet(PDF) 3 Page - Fairchild Semiconductor

Part No. DM74LS169A
Description  Synchronous 4-Bit Up/Down Binary Counter
Download  8 Pages
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Maker  FAIRCHILD [Fairchild Semiconductor]
Homepage  http://www.fairchildsemi.com
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DM74LS169A Datasheet(HTML) 3 Page - Fairchild Semiconductor

   
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Switching Characteristic
at V
CC = 5V and TA = 25˚C (for Test Waveforms and Output Load)
From (Input)
R
L = 2kΩ
Symbol
Parameter
To (Output)
C
L = 15 pF
C
L = 50 pF
Units
Min
Max
Min
Max
f
MAX
Maximum Clock
25
20
MHz
Frequency
t
PLH
Propagation Delay Time
Clock to
35
39
ns
Low to High Level Output
Ripple Carry
t
PHL
Propagation Delay Time
Clock to
35
44
ns
High to Low Level Output
Ripple Carry
t
PLH
Propagation Delay Time
Clock to
20
24
ns
Low to High Level Output
Any Q
t
PHL
Propagation Delay Time
Clock to
23
32
ns
High to Low Level Output
Any Q
t
PLH
Propagation Delay Time
Enable T to
18
24
ns
Low to High Level Output
Ripple Carry
t
PHL
Propagation Delay Time
Enable T to
18
28
ns
High to Low Level Output
Ripple Carry
t
PLH
Propagation Delay Time
Up/Down to
25
30
ns
Low to High Level Output
Ripple Carry (Note 8)
t
PHL
Propagation Delay Time
Up/Down to
29
38
ns
High to Low Level Output
Ripple Carry (Note 8)
Note 8: The propagation delay from UP/DOWN to RIPPLE CARRY must be measured with the counter at either a minimum or a maximum count. As the logic level
of the up/down input is changed, the ripple carry output will follow. If the count is minimum, the ripple carry output transition will be in phase. If the count is maximum,
the ripple carry output will be out of phase.
3
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