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54LS169DMQB View Datasheet(PDF) - National ->Texas Instruments

Part NameDescriptionManufacturer
54LS169DMQB Synchronous 4-Bit Up/Down Binary Counter National-Semiconductor
National ->Texas Instruments National-Semiconductor
54LS169DMQB Datasheet PDF : 8 Pages
1 2 3 4 5 6 7 8
Switching Characteristics at VCC e 5V and TA e 25 C (See Section 1 for Test Waveforms and Output Load)
Symbol
Parameter
From (Input)
To (Output)
RL e 2 kX
CL e 15 pF
CL e 50 pF
Min
Max
Min
Max
Units
fMAX
Maximum Clock
Frequency
25
20
MHz
tPLH
Propagation Delay Time
Low to High Level Output
Clock to
Ripple Carry
35
39
ns
tPHL
Propagation Delay Time
High to Low Level Output
Clock to
Ripple Carry
35
44
ns
tPLH
Propagation Delay Time
Low to High Level Output
Clock to
Any Q
20
24
ns
tPHL
Propagation Delay Time
High to Low Level Output
Clock to
Any Q
23
32
ns
tPLH
Propagation Delay Time
Low to High Level Output
Enable T to
Ripple Carry
18
24
ns
tPHL
Propagation Delay Time
High to Low Level Output
Enable T to
Ripple Carry
18
28
ns
tPLH
Propagation Delay Time
Up Down to
25
Low to High Level Output
Ripple Carry (Note 1)
30
ns
tPHL
Propagation Delay Time
Up Down to
29
High to Low Level Output
Ripple Carry (Note 1)
38
ns
Note 1 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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