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参数资料
| 型号： | AT83C5112 |
| 厂商： | Atmel Corp. |
| 英文描述： | 8-bit Microcontroller with A/D Converter |
| 中文描述： | 8位微控制器与A / D转换器 |
| 文件页数： | 82/97页 |
| 文件大小： | 1229K |
| 代理商： | AT83C5112 |
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82
AT8xC5112
4191B
–
8051
–
04/03
AC Parameters
Explanation of the AC
Symbols
Each timing symbol has 5 characters. The first character is always a
“
t
”
(that stands for
Time). The other characters, depending on their positions, stand for the name of a sig-
nal or the logical status of that signal. The following is a list of all the characters and
what they stand for.
Example:T
XHDV
= Time from clock rising edge to input data valid.
T
A
= -40
°
C to +85
°
C (industrial temperature range); V
SS
= 0V; 2.7V <
V
CC
< 5.5V ; -L
range.
Table 64. gives the maximum applicable load capacitance for Port 1, 3 and 4. Timings
will be guaranteed if these capacitances are respected. Higher capacitance values can
be used, but timings will then be degraded.
Table 64.
Load Capacitance Versus Speed Range, in pF
Table 66, Table 69 and Table 72 give the description of each AC symbols.
Table 67, Table 70 and Table 73 give for each range the AC parameter.
Table 68, Table 71 and Table 74. 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 ( -L) and replace this value in the formula. Values of the frequency must be
limited to the corresponding speed grade:
Table 65.
Max frequency for Derating Formula Regarding the Speed Grade
Example:
T
XHDV
in X2 mode for a -L part at 20 MHz (T = 1/20
E6
= 50 ns):
x = 133 (Table 74)
T = 50ns
T
XHDV
= 5T - x = 5 x 50 - 133 = 117 ns
-L
Port 1, 3 & 4
80
-L X1 mode,
V
CC
= 5V
-L X2 mode,
V
CC
= 5V
-L X1 mode,
V
CC
= 3V
-L X2 mode,
V
CC
= 3V
Freq (MHz)
40
33
40
20
T (ns)
25
30
25
50
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