Rainbow-electronics AT89C51SND1C Manual de usuario descargar pdf (Pagina 200)

200

AT8xC51SND1C

4109E–8051–06/03

Figure 158. AC Testing Input/Output Waveforms

Note: 1. During AC testing, all inputs are driven at V

-0.5 V for a logic 1 and 0.45 V for a

logic 0.

2. Timing measurements are made on all outputs at V

min for a logic 1 and V

max for

a logic 0.

Figure 159. Float Waveforms

Note: For timing purposes, a 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 loading V

level

occurs with I

= ±20 mA.

0.45 V

- 0.5

0.7 V

0.3 V

min

max

INPUTS OUTPUTS

LOAD

- 0.1 V

+ 0.1 V

LOAD

+ 0.1 V

LOAD

- 0.1 V

Timing Reference Points

1 2 ... 195 196 197 198 199 200 201 202 203 204 205 ... 209 210

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Rainbow-electronics AT89C51SND1C Manual de usuario Pagina 200