参数资料
型号: AT87C5112
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: AT87C5112
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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AT87C51RB2 制造商:IRF 制造商全称:International Rectifier 功能描述:High Performance 8-bit Microcontroller
AT87C51RB2-3CSUL 功能描述:8位微控制器 -MCU OTP RB/16K 40MHZ 3V RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT
AT87C51RB2-3CSUM 功能描述:8位微控制器 -MCU 32KB SCMOS 3/2 .5 OTP RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT
AT87C51RB2-RLRUM 功能描述:8位微控制器 -MCU 32KB 2.5u RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT
AT87C51RB2-RLTUL 功能描述:8位微控制器 -MCU OTP RB/16K 40MHZ 3V RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT