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PC87413 bảng dữ liệu(PDF) 242 Page - National Semiconductor (TI) |
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PC87413 bảng dữ liệu(HTML) 242 Page - National Semiconductor (TI) |
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242 / 257 page ![]() 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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