HD74LS161A Ver la hoja de datos (PDF) - Renesas Electronics

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HD74LS161A

Synchronous 4-bit Binary Counter (direct clear)

Renesas Electronics 

HD74LS161A

Waveforms 1

ƒmax, tPLH, tPHL, (Clock→Q, Ripple Carry)

tTLH

tTHL

Clock

90% 90%

3V

10% 1.3V 1.3V 10%

1.3V

1.3V

0V

(Measure at tw (CK) tPHL

tPLH

tn + 1)

(Measure at tn + 2)

VOH

QA

1.3V

1.3V

tPHL

tPLH (Measure at tn + 2)

VOL

(Measure at tn + 4)

VOH

QB

1.3V

1.3V

VOL

tPHL

tPLH (Measure at tn + 4)

(Measure at tn + 8)

VOH

QC

1.3V

1.3V

VOL

tPHL

tPLH (Measure at tn + 8)

(Measure at

tn + 16)

VOH

QD

1.3V

1.3V

VOL

tPLH

(Measure at

tn + 15)

tPHL (Measure at tn + 16)

VOH

Ripple

Carry

1.3V

1.3V

VOL

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

and : ƒmax tTLH = tTHL ≤ 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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