HD74HC390 데이터 시트보기 (PDF) - Renesas Electronics

부품명

상세내역

일치하는 목록

HD74HC390

Dual Decade Counters

Renesas Electronics 

HD74HC390

Waveforms

• Waveform – 1

tr

tf

Clock

QA

QB

QC

QD

50%

50% 50%

50%

tw

tw

tPHL (Measure at tn+2)

tPLH (Measure at tn+1)

90%

50%

10%

90%

50%

10%

tTHL

tTLH

tPHL (Measure at tn+4)

tPLH (Measure at tn+2)

90%

50%

10%

90%

50%

10%

tTHL

tPHL (Measure at tn+8)

90%

50%

10%

tTLH

tPLH (Measure at tn+4)

90%

50%

10%

tTHL

tTLH

tPHL (Measure at tn+10)

tPLH (Measure at tn+8)

90%

50%

10%

50%

10%

90%

tTHL

tTLH

Notes: 1. Input waveform: PRR ≤ 1 MHz, Zo = 50 Ω, tr ≤ 6 ns, tf ≤ 6 ns

2. tn is bit time with all outputs at low.

VCC

0V

VOH

VOL

VOH

VOL

VOH

VOL

VOH

VOL

• Waveform – 2

Clear

QA to QD

tr

tf

10 %

90 %

50 % 50 %

tw(clear)

tPHL

10 %

90%

50 %

10%

tTHL

VCC

0V

VOH

VOL

Notes: 1. Input waveform: PRR ≤ 1 MHz, Zo = 50 Ω, tr ≤ 6 ns, tf ≤ 6 ns

2. The output are measured one at a time with one transition per measurement.

Rev.2.00 Mar 30, 2006 page 5 of 6

Share Link: