HD74LS193P Просмотр технического описания (PDF) - Renesas Electronics

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HD74LS193P

Synchronous Up / Down Decade Counter (dual clock lines)

Renesas Electronics 

HD74LS193

Waveforms 1

ƒmax, tPLH, tPHL, (Count Up)

tTLH

tTHL

Count

90% 90%

3V

Up

10% 1.3V 1.3V 10%

1.3V

1.3V

0V

tw (H)

tw (L)

tPHL

tPLH

(Measure at

tn + 2)

VOH

QA

(Measure at

tn + 1)

1.3V

tPHL

tPLH (Measure at tn + 2)

VOL

(Measure at

tn + 4)

VOH

QB

1.3V

1.3V

Outputs

QC

VOL

tPHL

tPLH (Measure at tn + 4)

(Measure at

tn + 8)

VOH

1.3V

1.3V

VOL

tPHL

tPLH (Measure at tn + 8)

(Measure at

tn + 16)

VOH

QD

1.3V

1.3V

VOL

(Measure before tPHL

tPLH (Measure at tn + 16)

1 clock of tn + 16)

Carry

VOH

1.3V

1.3V

VOL

Notes:

1. Input pulse; tTLH, tTHL ≤ 7 ns, Duty Cycle ≤ 50%, PRR = 500 kHz (Data input). PRR = 1 MHz

(except data input)

2. for ƒmax tTLH = tTHL ≤ 2.5 ns.

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

Rev.2.00, Feb.18.2005, page 7 of 11

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