ST40RA166 View Datasheet(PDF) - STMicroelectronics
Part Name
Description
MFG CO.
'ST40RA166' PDF : 88 Pages View PDF
6 Electrical specifications
ST40RA166
6.9 System CLKIN AC specifications
The timings referenced in Figure 16 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 CLOCKOSC output is
<2pF.
Symbol
Parameter
Min Nom
tCLCH
tCHCL
tCLCL
CLKIN pulse width low
CLKIN pulse width high
CLKIN period
6
6
27
tCr
CLKIN rise time
tCf
CLKIN fall time
Table 29: CLKIN timings
a. Measured between corresponding points on consecutive falling edges.
b. When driven by an external clock.
c. Clock transitions must be monotonic within the range VIH to VIL.
Max
10
10
Units Notes
ns
ns
MHz a
ns
b, c
ns
2, 3
VDDCORE * 0.8
VDDCORE * 0.5
VDDCORE * 0.2
tCLCH
tCLCL
tCHCL
90%
10%
90%
10%
tCf
tCr
Figure 16: CLKIN timings
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