参数资料
型号: ST72621K4B1
厂商: STMICROELECTRONICS
元件分类: 微控制器/微处理器
英文描述: 8-BIT, FLASH, 8 MHz, MICROCONTROLLER, PDIP32
封装: 0.400 INCH, LEAD FREE, SHRINK, PLASTIC, DIP-32
文件页数: 9/139页
文件大小: 1264K
代理商: ST72621K4B1
106/139
Doc ID 6996 Rev 5
CLOCK AND TIMING CHARACTERISTICS (Cont’d)
12.5.3 External Clock Source
Note:
1. Refer to Figure 58 for more information.
Figure 58. Typical Application with an External Clock Source
12.5.4 Crystal Oscillator Output Drive Level
Figure 59. Typical Application with a Crystal Resonator
Symbol
Parameter
Conditions
Min
Typ
Max
Unit
VOSCINH
OSCIN input pin high level voltage
0.7xVDD
VDD
V
VOSCINL
OSCIN input pin low level voltage
VSS
0.3xVDD
tw(OSCINH)
tw(OSCINL)
OSCIN high or low time 1)
15
ns
tr(OSCIN)
tf(OSCIN)
OSCIN rise or fall time1)
15
IL
OSCx Input leakage current
VSS≤VIN≤VDD
±1
μA
OSCIN
OSCOUT
fOSC
EXTERNAL
ST72XXX
CLOCK SOURCE
Not connected internally
VOSCINL
VOSCINH
tr(OSCIN)
tf(OSCIN)
tw(OSCINH)
tw(OSCINL)
IL
90%
10%
Symbol
Parameter
Conditions
Typ
Unit
POSCOUT
Oscillator OSCOUT pin drive level
At 5V / 25°C
1
mW
OSCOUT
OSCIN
fOSC
CL1
CL2
i2
RF
ST72XXX
RESONATOR
200
Ω<R
S<400Ω
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