TS80C51RA2 Atmel Corporation, TS80C51RA2 Datasheet - Page 70

• Manufacturer Part Number: TS80C51RA2
• Description: High Performance 8-bit Microcontroller
• Manufacturer: Atmel Corporation

External Clock Drive
Characteristics (XTAL1)
External Clock Drive
Waveforms
Figure 30. External Clock Drive Waveforms
AC Testing Input/Output
Waveforms
Figure 31. AC Testing Input/Output Waveforms
Float Waveforms
Figure 32. Float Waveforms
70
TS8xC51Rx2
INPUT/OUTPUT
0.45 V
V
CC
-0.5 V
V
AC inputs during testing are driven at V
Timing measurement are made at V
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 loaded V
occurs. I
CC
0.2V
T
0.45 V
-0.5 V
CHCX
0.7V
Symbol
V
V
T
T
T
T
T
OH
OL
CHCX
CLCH
CHCL
CC
CLCL
CLCX
T
/T
-0.1 V
+0.1 V
CC
CHCL
-0.1 V
CLCX
OL
/I
OH
Parameter
Oscillator Period
High Time
Low Time
Rise Time
Fall Time
Cyclic ratio in X2 mode
FLOAT
≥ ± 20mA.
V
LOAD
T
CLCX
0.2V
0.2V
CC
CC
+0.9
-0.1
T
V
IH
V
CLCL
LOAD
LOAD
min for a logic “1” and V
CC
+0.1 V
T
-0.1 V
- 0.5 for a logic “1” and 0.45V for a logic “0”.
CLCH
T
CHCX
Min
25
40
5
5
IL
max for a logic “0”.
Max
60
5
5
4188A–8051–10/02
OH
/V
Units
OL
ns
ns
ns
ns
ns
%
level