HD74LS193FPEL 查看數據表（PDF） - Renesas Electronics

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HD74LS193FPEL

Synchronous Up / Down Decade Counter (dual clock lines)

Renesas Electronics 

HD74LS193

Waveforms 2

ƒmax, tPLH, tPHL, (Count Down)

tTLH

tTHL

tw (H)

tw (L)

Count

Down

90% 90%

10% 10%

1.3V

1.3V

1.3V

(Measure at tn + 1) tPHL

1.3V

1.3V

tPLH (Measure

at tn + 0)

QA

QB

Outputs

QC

1.3V

tPHL (Measure at tn + 2)

1.3V

1.3V

tPHL (Measure at tn + 4)

1.3V

tPHL (Measure at tn + 8)

1.3V

tPLH (Measure

at tn + 0)

1.3V

tPLH (Measure

at tn + 0)

1.3V

tPLH (Measure

at tn + 0)

QD

1.3V

1.3V

(Measure before 1 clock of tn + 0) tPHL

tPLH (Measure

at tn + 0)

Borrow

1.3V

1.3V

Notes:

1. Input pulse; tTLH ≤ 7 ns, tTHL ≤ 7 ns, PRR = 1 MHz, duty cycle 50%

2. for ƒmax tTLH , tTHL ≤ 2.5 ns.

3. tn is reference bit time when all outputs are high.

3V

0V

VOH

VOL

VOH

VOL

VOH

VOL

VOH

VOL

VOH

VOL

Rev.2.00, Feb.18.2005, page 8 of 11

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