Rainbow-electronics T89C51CC01 Manual de usuario descargar pdf (Pagina 143)

143

T89C51CC01

Rev. D – 17-Dec-01

19.4.11 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”.

19.4.12 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.

19.4.13 Clock Waveforms Valid in normal clock mode. In X2 mode XTAL2 must be changed to XTAL2/2.

INPUT/OUTPUT

0.2 V

+0.9

0.2 V

-0.1

-0.5 V

0.45 V

FLOAT

-0.1V

+0.1V

LOAD

+0.1V

LOAD

-0.1V

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Rainbow-electronics T89C51CC01 Manual de usuario Pagina 143