HD74LS293 Просмотр технического описания (PDF) - Renesas Electronics

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HD74LS293

4-bit Binary Counter

Renesas Electronics 

HD74LS293

Waveforms 1

ƒmax, tPLH, tPHL, (Clock→Q)

tTLH

tTHL

Clock

QA

10%

90% 90%

1.3 V

10%

tPHL(Measure at tn+2)

1.3 V

tPLH (Measure at tn+1)

1.3 V

1.3 V

tPHL (Measure at tn+4) tPLH (Measure at tn+2)

QB

1.3 V

1.3 V

tPHL (Measure at tn+8) tPLH (Measure at tn+4)

QC

1.3 V

1.3 V

tPHL (Measure at tn+16) tPLH (Measure at tn+8)

QD

1.3 V

1.3 V

3V

0V

VOH

VOL

VOH

VOL

VOH

VOL

VOH

VOL

Notes:

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

and : for ƒmax, tTLH = tTHL ≤ 2.5 ns.

2. tn is reference bit time when all outputs are low.

Waveforms 2

tPHL, (R0→Q)

tTLH

tTHL

90% 90%

3V

1.3 V 1.3 V

R0

10%

10%

0V

tw ≥ 15ns

tPHL

VOH

QA to QD

1.3 V

VOL

Note: tTLH ≤ 15 ns, tTHL ≤ 5 ns

Rev.3.00, Jul.15.2005, page 6 of 7

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