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PC87413 Datasheet(PDF) 242 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part # PC87413
Description  LPC ServerI/O for Servers and Workstations
PDF  257 Pages
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Manufacturer  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

PC87413 Datasheet(HTML) 242 Page - National Semiconductor (TI)

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11.0 Device Characteristics (Continued)
www.national.com
242
Revision1.2
Low Frequency Clock Timing
Figure 61. Low Frequency Clock Waveforms
Figure 62. Internal Clock Waveforms
Symbol
Figure
Description
Reference Conditions
Min
Typ
Max
Units
Clock Input Timing
t32KCLKIN
–
Required clock period for
32KCLKIN1
1. Recommended for RTC timekeeping accuracy and for HFCKOUT, LFCKOUT frequency accuracy.
From RE to RE of
32KCLKIN.
30.5145
(t32TYP −
100ppm)
30.517578
(t32TYP)
30.5206
(t32TYP +
100ppm)
µs
Clock Output Timing
t32KOSC
61
Clock period of the internal
oscillator2
2. Determined by the values of the external crystal circuit components.
From RE to RE of
LFCKOUT.
30.517578
(t32TYP)
µs
t32KW
61
32K oscillator wake-up time3
3. Not tested. Guaranteed by characterization.
After VSB >VSBON
1
sec
t32KD
62
Internally generated
40/48 MHz clock delay time3
After VSB >VSBON
33
ms
32KX2
t32KW
0V
32KX1/32KCLKIN
0V
t32KOSC
VBAT
VSB
VSB
t32KD
Internally Generated
40/48 MHz Clock
VBAT
0V



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