37

AT89C5132

4173CS–USB–07/04

Figure 17. AC Testing Input/Output Waveforms

Notes:

1. During AC testing, all inputs are driven at

V

2. Timing measurements are made on all outputs at V

Figure 18. 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

0.45 V

V

0.7

V

DD

0.3

V

DD

V

INPUTS

OUTPUTS

V

LOAD

V

V

V

V

Timing Reference Points