參數(shù)資料
型號: SAB88C166W-5M
廠商: SIEMENS A G
元件分類: 微控制器/微處理器
英文描述: 16-Bit CMOS Single-Chip Microcontrollers with/without oscillator prescaler with 32 KByte Flash EPROM
中文描述: 16-BIT, FLASH, 20 MHz, MICROCONTROLLER, PQFP100
文件頁數(shù): 36/58頁
文件大?。?/td> 611K
代理商: SAB88C166W-5M
SAB 88C166(W)
Semiconductor Group
35
AC Characteristics
(cont’d)
External Clock Drive XTAL1 for the SAB 88C166W
V
CC
= 5 V
±
10 %;
V
SS
= 0 V
T
A
= 0 to + 70 C
for SAB 88C166W-M
Note:
In order to run the SAB 88C166W at a CPU clock of 20 MHz the duty cycle of the oscillator
clock must be 0.5, ie. the relation between the oscillator high and low phases must be 1:1. So
the variation of the duty cycle of the oscillator clock limits the maximum operating speed of
the device.
The 16 MHz values in the tables are given as an example for a typical duty cycle variation of
the oscillator clock from 0.4 to 0.6.
Figure 16
External Clock Drive XTAL1
Parameter
Symbol
CPU Clock = 16 MHz
Duty cycle 0.4 to 0.6
Variable CPU Clock
1/CLP = 1 to 20 MHz
Unit
min.
max.
min.
max.
Oscillator period
CLPSR
62.5
62.5
50
1000
ns
High time
TCL
H
SR
TCL
L
SR
t
R
SR
t
F
SR
DCSR
25
25
CLP-TCL
L
CLP-TCL
H
10
ns
Low time
25
25
ns
Rise time
10
ns
Fall time
10
10
ns
Oscillator duty cycle
0.4
0.6
25 / CLP
1 – 25 / CLP
Clock cycle
TCLSR
25
37.5
CLP x DC
min
CLP x DC
max
ns
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