AT89C1051-12PI データシートの表示（PDF） - Atmel Corporation
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AT89C1051-12PI Datasheet PDF : 12 Pages
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External Clock Drive Waveforms
External Clock Drive
Symbol
Parameter
1/tCLCL
tCLCL
tCHCX
tCLCX
tCLCH
tCHCL
Oscillator Frequency
Clock Period
High Time
Low Time
Rise Time
Fall Time
VCC = 2.7V to 6.0V
Min
Max
0
12
83.3
30
30
20
20
VCC = 4.0V to 6.0V
Min
Max
0
24
41.6
15
15
20
20
Units
MHz
ns
ns
ns
ns
ns
AC Testing Input/Output Waveforms(1)
Float Waveforms(1)
Note:
1. AC Inputs during testing are driven at VCC - 0.5V for a
logic 1 and 0.45V for a logic 0. Timing measurements
are made at VIH min. for a logic 1 and VIL max. for a
logic 0.
Note:
1. For timing purposes, a port pin is no longer float-
ing when a 100 mV change load voltage occurs. A
port pin begins to float when a 100 mV change
from the loaded VOH/VOL level occurs.
4-12
AT89C1051
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