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| MC74HC161A_13 Datasheet, PDF (12/15 Pages) ON Semiconductor – Presettable Counters | |||
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MC74HC161A, MC74HC163A
TYPICAL APPLICATIONS CASCADING
LOAD
INPUTS
INPUTS
INPUTS
H = COUNT
L = DISABLE
H = COUNT
L = DISABLE
LOAD P0 P1 P2 P3
ENABLE P
RIPPLE
ENABLE T CARRY
OUT
CLOCK
R Q0 Q1 Q2 Q3
LOAD P0 P1 P2 P3
ENABLE P
RIPPLE
ENABLE T CARRY
OUT
CLOCK
R Q0 Q1 Q2 Q3
LOAD P0 P1 P2 P3
ENABLE P
RIPPLE
ENABLE T CARRY
OUT
CLOCK
TO MORE
SIGNIFICANT
STAGES
R Q0 Q1 Q2 Q3
RESET
CLOCK
OUTPUTS
OUTPUTS
OUTPUTS
NOTE: When used in these cascaded configurations the clock fmax guaranteed limits may not apply. Actual performance will
depend on number of stages. This limitation is due to set up times between Enable (Port) and Clock.
Figure 14. NâBit Synchronous Counters
LOAD
ENABLE P
ENABLE T
CLOCK
RESET
INPUTS
INPUTS
LOAD P0 P1 P2 P3
ENABLE P
RIPPLE
ENABLE T CARRY
OUT
CLOCK
R Q0 Q1 Q2 Q3
LOAD P0 P1 P2 P3
ENABLE P
RIPPLE
ENABLE T CARRY
OUT
CLOCK
R Q0 Q1 Q2 Q3
OUTPUTS
OUTPUTS
Figure 15. Nibble Ripple Counter
http://onsemi.com
12
INPUTS
LOAD P0 P1 P2 P3
ENABLE P
RIPPLE
ENABLE T CARRY
OUT
CLOCK
TO MORE
SIGNIFICANT
STAGES
R Q0 Q1 Q2 Q3
OUTPUTS
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