MC74HC161AN Просмотр технического описания (PDF) - ON Semiconductor

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производитель

MC74HC161AN

Presettable Counters

ON Semiconductor 

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. N–Bit 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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