Atmel AT89C2051 Manual page 14

21. Shift Register Mode Timing Waveforms
22. AC Testing Input/Output Waveforms
Note: 1. AC Inputs during testing are driven at V
min. for a logic 1 and V
23. Float Waveforms
Note: 1. For timing purposes, a port pin is no longer floating when a 100 mV change from load voltage occurs. A port pin begins to
float when 100 mV change from the loaded V
AT89C2051
14
- 0.5V for a logic 1 and 0.45V for a logic 0. Timing measurements are made at V
CC
max. for a logic 0.
IL
(1)
/V
OH
(1)
level occurs.
OL
IH
0368G–MICRO–6/05