参数资料
型号: ST40RA200XH6E
厂商: STMICROELECTRONICS
元件分类: 微控制器/微处理器
英文描述: 32-BIT, 200 MHz, RISC PROCESSOR, PBGA372
封装: 27 X 27 MM, 2.33 MM HEIGHT, PLASTIC, BGA-372
文件页数: 68/94页
文件大小: 2144K
代理商: ST40RA200XH6E
70/92
ST40RA
7 Electrical specifications
7.10
Low power CLKIN AC specifications
The timings referenced in Figure 18 refer to the case where CLKIN is directly clocked from an
external source. In this case care should be taken that the total load on the LPCLKOSC output is
<2pF.
Table 34: LPCLKIN timings
Symbol
Parameter
Min
Nom
Max
Units
Notes
tLCLLCL
LPCLKIN period
32.678
kHz
a, b
a. Measured between corresponding points on consecutive falling edges.
b. Variation of individual falling edges from their nominal times.
LPCLKIN duty cycle
10
50
90
%
tLCr
LPCLKIN rise time
10
ns
c, d
c. When driven by an external clock.
d. Transitions must be monotonic within the range VIH to VIL
tLCf
LPCLKIN fall time
10
ns
3, 4
Figure 18: CLKIN timings
VDDRTC * 0.8
VDDRTC * 0.2
tLCLLCL
90%
10%
tLCf
90%
10%
tLCr
VDDRTC * 0.5
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