Rainbow-electronics T89C51CC02 Manuel d'utilisateur télécharger pdf (Page 135)

Rev.A - May 17, 2001 135

Preliminary

T89C51CC02

19.4.5. External Clock Drive Waveforms

19.4.6. AC Testing Input/Output Waveforms

AC inputs during testing are driven at V

- 0.5 for a logic “1” and 0.45V for a logic “0”. Timing measurement

are made at V

min for a logic “1” and V

max for a logic “0”.

19.4.7. Float Waveforms

For timing purposes as port pin is no longer floating when a 100 mV change from load voltage occurs and begins

to float when a 100 mV change from the loaded V

level occurs. I

≥±20mA.

-0.5V

0.45V

0.7V

0.2V

-0.1

CHCL

CLCX

CLCL

CLCH

CHCX

INPUT/OUTPUT

0.2 V

+ 0.9

0.2 V

- 0.1

-0.5 V

0.45 V

FLOAT

- 0.1 V

+ 0.1 V

LOAD

+ 0.1 V

LOAD

- 0.1 V

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Rainbow-electronics T89C51CC02 Manuel d'utilisateur Page 135