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PC87372 Datasheet(PDF) 132 Page - National Semiconductor (TI) |
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PC87372 Datasheet(HTML) 132 Page - National Semiconductor (TI) |
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132 / 144 page  10.0 Device Characteristics (Continued) 132 www.national.com Revision 1.2 Low-Frequency Clock Timing Figure 43. CLOCKI32 Timing Symbol Figure Clock Input Parameters Reference Conditions CLOCKI32 Units Min Typ Max tCP 43 Clock Period1 (50%-50%) 1. Not tested. Guaranteed by design. 30.4871 30.517578 30.5481 µs FCK − Clock Frequency F32TYP − 0.1% 32.768 (F32TYP) F32TYP + 0.1% KHz t32KW 43 Clock wake-up time VSB3 stable to clock start toggling System dependent2 2. If t32KW of the CLOCKI32 input is lower than 0.5 ms, use the 0.5 ms value in calculations involving the total wake-up time of the low-frequency clock (t32KW + t32KVAL). t32KVAL 43 Clock valid time1 Clock start toggling to clock valid 256 * tCP CLOCKI32 (32.768 KHz) t32KW VSB3 (Power) VSB3ONmin tCP t32KVAL (Internal) 32 KHz Domain |
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