HD74LS293P datasheet(6/8 Pages) RENESAS

部件名	HD74LS293P

功能描述	4-bit Binary Counter

PDF	8 Pages

Scroll/Zoom	100%

制造商	RENESAS [Renesas Technology Corp]

网页	http://www.renesas.com

标志

6 / 8 page

HD74LS293

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

Waveforms 1

max, tPLH, tPHL, (Clock→Q)

VOH

VOL

VOH

VOL

VOH

VOL

VOH

VOL

Clock

1.3 V

tTHL

tPHL (Measure at tn+8)

1.3 V

tPHL (Measure at tn+4)

1.3 V

tPHL(Measure at tn+2)

1.3 V

tPLH (Measure at tn+1)

1.3 V

tPLH (Measure at tn+2)

1.3 V

tPLH (Measure at tn+4)

1.3 V

tPLH (Measure at tn+8)

1.3 V

tPHL (Measure at tn+16)

1.3 V

10%

90%

tTLH

10%

90%

1.3 V

Notes:

Clock input pulse; tTLH

≤ 15 ns, t

THL

≤ 6 ns, PRR = 1 MHz, duty cycle = 50%

and : for

max, tTLH = tTHL

≤ 2.5 ns.

tn is reference bit time when all outputs are low.

Waveforms 2

tPHL, (R0→Q)

tw ≥ 15ns

VOH

VOL

0 V

3 V

tPHL

10%

90%

1.3 V

10%

90%

QA to QD

tTLH

tTHL

Note:

tTLH

≤ 15 ns, t

THL

≤ 5 ns

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