HD74LS161A Datasheet, PDF(7/11 Page) Hitachi Semiconductor – Synchronous 4-bit Binary Counters(direct clear)

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HD74LS161A Datasheet, PDF (7/11 Pages) Hitachi Semiconductor – Synchronous 4-bit Binary Counters(direct clear)

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HD74LS161A

Waveforms 1

Æmax, tPLH, tPHL, (ClockâQ, Ripple Carry)

tTLH

tTHL

Clock

90% 90%

10% 1.3V 1.3V 10%

1.3V

(Measure at tw (CK) tPHL

tPLH

tn + 1)

(Measure at tn + 2)

VOH

1.3V

tPHL

tPLH (Measure at tn + 2)

VOL

(Measure at tn + 4)

VOH

1.3V

VOL

tPHL

tPLH (Measure at tn + 4)

(Measure at tn + 8)

VOH

1.3V

VOL

tPHL

tPLH (Measure at tn + 8)

(Measure at

tn + 16)

VOH

1.3V

VOL

tPLH

(Measure at

tn + 15)

tPHL (Measure at tn + 16)

VOH

Ripple

Carry

1.3V

VOL

Note: Clock input pulse; tTLH â¤ 15 ns, tTHL â¤ 6 ns, PRR = 1 MHz, duty cycle 50%

and : Æmax tTLH = tTHL â¤ 2.5 ns.

tn is reference bit time when all outputs are low.

Rev.2.00, Feb.18.2005, page 7 of 10

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