参数资料
型号: ST72324K6B3/XXX
厂商: STMICROELECTRONICS
元件分类: 微控制器/微处理器
英文描述: 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PDIP32
封装: 0.400 INCH, SHRINK, PLASTIC, DIP-32
文件页数: 30/157页
文件大小: 1037K
代理商: ST72324K6B3/XXX
ST72324J/K
125/157
CLOCK CHARACTERISTICS (Cont’d)
12.5.4 RC Oscillators
The ST7 internal clock can be supplied with an RC
oscillator. This oscillator can be used with internal
or external components (selectable by option
byte).
Figure 68. Typical Application with RC oscillator
Notes:
1. Data based on characterization results.
2. Data based on design simulation.
3. REX must have a positive temperature coefficient (ppm/°C), carbon resistors should therefore not be used.
4. iCEX is the current needed to load the CEX capacitor while OSC1 is forced to VSS or 1.5V (RC oscillation voltage range).
Figure 69. Typical fOSC(RCINT) vs VDD
Figure 70. Typical fOSC(RCINT) vs TA
Symbol
Parameter
Condition s
Min
Typ
Max
Unit
fOSC (RCINT)
Internal RC oscillator frequency 1)
See Figure 69 and Figure 70
TA=25°C, VDD=5V
2
3.5
5.6
MHz
fOSC(RCEXT)
External RC oscillator frequency 2)
5/ (REX.CEX)
REX
Oscillator external resistor 3)
56
100
K
CEX
Oscillator external capacitor
22
470
pF
|iCEX|
Capacitor load current 4)
OSC1 = VSS or 1.5V
290
350
A
OSC2
OSC1
fOSC
CEX
REX
EXTERN AL RC
INTERNAL RC
VREF
+
-
VDD
Current copy
Voltage generator
CEX discharge
ST72XXX
RIN
CIN
iCEX
0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
2.35
5
5.5
VDD(V)
fOSC(RCINT)
(MHz)
TA=-45C
TA=25C
TA=130C
3
3.1
3.2
3.3
3.4
3.5
3.6
3.7
3.8
3.9
4
-45
0
25
70
130
TA(°C)
fOSC(RCINT)
(MHz)
Vdd = 2.4V
Vdd = 5V
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