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S-807 Datasheet(PDF) 41 Page - Seiko Instruments Inc |
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S-807 Datasheet(HTML) 41 Page - Seiko Instruments Inc |
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41 / 42 page  40 Collection of Product FAQs Author: Hamaguchi Masanao Date: 98/11/12 (Thursday) 10:17 (Modified: 98/12/14 (Monday) 16:42) <Information level> A: Public (Printing O.K.) Index: B: Technical <Product> Division name: 01 IC Category 1: 11 Power Supply Category 2: 1. Voltage Detectors Cal No.: S-807 Related Documents: Question: What is the method for calculating delay-time of the power-on clear circuit? Answer: The delay time (power-on clear time) produced in a power-on clear circuit using the S-807xxAN can be found by substituting constants in the following formula: ) Vdd + Vdet - 1 ( Ln × R × C × 1 = Tdelay Tdelay: Delay time [sec] C: External capacitance value [F] R: Resistance value [ Ω] V det+: S-807xxAN Series release voltage [V] Vdd: Supply voltage [V] V S-807xxAN Pull-up resistor R C Vdd S-807xxAN release voltage (Vdet+) Delay time S-807 input voltage Supply voltage (Vdd) Note: Set R to less than 7.5 k Ω to prevent oscillation. |
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