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¡ Semiconductor
(7) AC Characteristics Measuring Conditions
1.Input/output signal
V
OH
V
OL
* The input signals in AC test mode are either V
where logic "1" corresponds to a CPU output signal waveform measuring point in excess of
V
, and logic "0" to a point below V
IH
2.Floating
V
OH
V
OL
* The port 0 floating interval is measured from the time the port 0 pin voltage drops below V
after sinking to GND at 2.4 mA when switching to floating status from a "1" output, and from
the time the port 0 pin voltage exceeds V
to floating status from a "0" output.
(8) XTAL1 external clock input waveform conditions
Parameter
External Clock Freq.
Clock Pulse width 1
Clock Pulse width 2
Rise Time
Fall Time
External Clock Drive Waveform
EXTERNAL
OSCILLATOR
SIGNAL
V
IH
TEST POINT
V
IL
(logic "1") or V
OH
.
IL
Floating
V
IH
V
IL
after connecting to a 400 A source when switching
IL
Symbol
1/t
CLCL
t
CHCx
t
CLCX
t
CLCH
t
CHCL
t
CHCL
t
t
CHCX
CLCX
MSM80C154S/83C154S
V
OH
V
IH
V
IL
V
OL
(logic "0") input signals
OL
V
OH
V
IH
V
IL
V
OL
Min.
Max.
0
24
15
—
15
—
—
5
—
5
0.7 V
CC
0.2 V
- 0.1
CC
t
CLCH
t
CLCL
IH
Unit
MHz
ns
ns
ns
ns
293
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