Rainbow-electronics AT89C5132 Manual do Utilizador descarregar pdf (Página 154)

154

AT8xC5132

4173A–8051–08/02

Figure 134. AC Testing Input/Output Waveforms

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

-0.5V for a logic 1 and 0.45V 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 135. 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

0.3 V

min

max

INPUTS OUTPUTS

LOAD

- 0.1V

+ 0.1V

LOAD

+ 0.1V

LOAD

- 0.1V

Timing Reference Points

1 2 ... 149 150 151 152 153 154 155 156 157 158 159 160 161 162

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