參數(shù)資料
型號: TS87C51RC2-MIE
廠商: International Rectifier
英文描述: High Performance 8-bit Microcontroller
中文描述: 高性能8位微控制器
文件頁數(shù): 71/85頁
文件大?。?/td> 762K
代理商: TS87C51RC2-MIE
71
4188E–8051–08/06
AT/TS8xC51Rx2
11.5.11
External Clock Drive Characteristics (XTAL1)
11.5.12
External Clock Drive Waveforms
Figure 11-11.
External Clock Drive Waveforms
11.5.13
AC Testing Input/Output Waveforms
Figure 11-12.
AC Testing Input/Output Waveforms
AC inputs during testing are driven at V
CC
- 0.5 for a logic “1” and 0.45V for a logic “0”. Timing
measurement are made at V
IH
min for a logic “1” and V
IL
max for a logic “0”.
11.5.14
Float Waveforms
Figure 11-13.
Float Waveforms
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
OH
/V
OL
level occurs. I
OL
/I
OH
±
20mA.
Symbol
Parameter
Min
Max
Units
T
CLCL
Oscillator Period
25
ns
T
CHCX
High Time
5
ns
T
CLCX
Low Time
5
ns
T
CLCH
Rise Time
5
ns
T
CHCL
Fall Time
5
ns
T
CHCX
/T
CLCX
Cyclic ratio in X2 mode
40
60
%
V
CC
-0.5
V
0.45
V
0.7V
CC
0.2V
CC
-0.1
V
T
CHCL
T
CLCX
T
CLCL
T
CLCH
T
CHCX
0.45
V
V
CC
-0.5
V
0.2V
CC
+0.9
0.2V
CC
-0.1
INPUT/OUTPUT
V
OL
+0.1 V
V
OH
-0.1 V
FLOAT
V
LOAD
V
LOAD
+0.1 V
V
LOAD
-0.1 V
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