參數(shù)資料
型號(hào)： TS80C51RD2-MCE
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(yè)數(shù)： 63/85頁(yè)
文件大?。?/td> 762K
代理商： TS80C51RD2-MCE
63
4188E–8051–08/06
AT/TS8xC51Rx2
T
A
= 0 to +70
°
C (commercial temperature range); V
SS
= 0 V; 2.7 V < V
CC <
5.5 V; -L range.
T
A
= -40
°
C to +85
°
C (industrial temperature range); V
SS
= 0 V; 2.7 V < V
CC <
5.5 V; -L range.
Table 11-3. gives the maximum applicable load capacitance for Port 0, Port 1, 2 and 3, and ALE
and PSEN signals. Timings will be guaranteed if these capacitances are respected. Higher
capacitance values can be used, but timings will then be degraded.
Table 11-3.
Load Capacitance versus speed range, in pF
Table 11-5., Table 39. and Table 42. give the description of each AC symbols.
Table 11-6., Table 11-8. and Table 11-10. give for each range the AC parameter.
Table 11-7., Table 11-9. and Table 11-11. give the frequency derating formula of the AC param-
eter. To calculate each AC symbols, take the x value corresponding to the speed grade you
need (-M, -V or -L) and replace this value in the formula. Values of the frequency must be limited
to the corresponding speed grade:
Table 11-4.
Max frequency for derating formula regarding the speed grade
Example:
T
LLIV
in X2 mode for a -V part at 20 MHz (T = 1/20
E6
= 50 ns):
x= 22 (Table 11-7.)
T= 50ns
T
LLIV
= 2T - x = 2 x 50 - 22 = 78ns
-M
-V
-L
Port 0
100
50
100
Port 1, 2, 3
80
50
80
ALE / PSEN
100
30
100
-M X1 mode
-M X2 mode
-V X1 mode
-V X2 mode
-L X1 mode
-L X2 mode
Freq (MHz)
40
20
40
30
30
20
T (ns)
25
50
25
33.3
33.3
50
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