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PLMT01SPHTA/EM 数据表(PDF) 13 Page - Texas Instruments |
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PLMT01SPHTA/EM 数据表(HTML) 13 Page - Texas Instruments |
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13 / 23 page ![]() tr= R×C×2.197 F S HL F HL V V t R C In V V § · u u ¨ ¸ © ¹ 34 and 125 µA C 100pF OUTPUT POWER R 10k VS VF VHL tHL LMT01-SP 13 LMT01-SP www.ti.com SNIS205 – JANUARY 2019 Product Folder Links: LMT01-SP Submit Documentation Feedback Copyright © 2019, Texas Instruments Incorporated Stray capacitance can be introduced when connecting the LMT01-SP through a long wire. This stray capacitance influences the signal rise and fall times. The wire inductance has negligible effect on the AC signal integrity. A simple RC time constant model as shown in Figure 23 can be used to determine the rise and fall times. Figure 23. Simple RC Model for Rise and Fall Times where • RC as shown in Figure 23 • VHL is the target high level • the final voltage VF = 125 µA × R • the start voltage VS = 34 µA × R (2) For the 10% to 90% level rise time (tr), Equation 2 simplifies to: (3) Take care to ensure that the LMT01-SP voltage drop does not exceed 300 mV under reverse bias conditions, as given in the Absolute Maximum Ratings. 7.4 Device Functional Modes The only functional mode the LMT01-SP has is that it provides a pulse count output that is directly proportional to temperature. |
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