T89C51RD2 ATMEL Corporation, T89C51RD2 Datasheet - Page 84

• Manufacturer Part Number: T89C51RD2
• Description: 0 to 40MHz Flash Programmable 8-bit Microcontroller
• Manufacturer: ATMEL Corporation

9.5.11. External Clock Drive Characteristics (XTAL1)
9.5.12. External Clock Drive Waveforms
9.5.13. AC Testing Input/Output Waveforms
AC inputs during testing are driven at V
are made at V
9.5.14. Float Waveforms
For timing purposes as 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
Rev. F - 15 February, 2001
T
CHCX
Symbol
INPUT/OUTPUT
T
T
T
T
T
CHCX
CLCX
CLCH
CHCL
CLCL
/T
CLCX
0.45V
IH
V
CC
min for a logic “1” and V
Oscillator Period
High Time
Low Time
Rise Time
Fall Time
Cyclic ratio in X2 mode
-0.5V
0.2V
V
CC
0.7V
V
V
Parameter
0.45 V
CC
-0.5 V
OH
OL
CC
-0.1
T
+ 0.1 V
- 0.1 V
CHCL
CC
Table 48. AC Parameters
IL
- 0.5 for a logic “1” and 0.45V for a logic “0”. Timing measurement
FLOAT
V
max for a logic “0”.
LOAD
OH
T
/V
CLCX
OL
0.2 V
0.2 V
level occurs. I
CC
CC
+ 0.9
- 0.1
T
Min
V
V
CLCL
25
40
5
5
LOAD
LOAD
+ 0.1 V
- 0.1 V
T
CLCH
OL
T
CHCX
/I
OH
T89C51RD2
20mA.
Max
60
5
5
Units
ns
ns
ns
ns
ns
%
84