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RNA51957BFPH0 Datasheet(PDF) 7 Page - Renesas Technology Corp |
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RNA51957BFPH0 Datasheet(HTML) 7 Page - Renesas Technology Corp |
7 / 14 page RNA51957A, B Preliminary REJ03D0912-0402 Rev.4.02 Page 7 of 13 Apr 01, 2010 Example of Application Circuit Reset Circuit of RNA51957 RL VCC R1 R2 RNA51957x RESET Logic circuit Input GND GND Delay capacitor Cd Power- supply Power- supply Output Figure 1 Reset Circuit of RNA51957 Notes: 1. When the detecting supply voltage is 4.25 V, RNA51953 are used. In this case, R1 and R2 are not necessary. When the voltage is anything except 4.25 V, RNA51957 and RNA51958 are used. In this case, the detecting supply voltage is 1.25 (R 1 +R2)/R2 (V) approximately. The detecting supply voltage can be set between 2 V and 15 V. 2. If a longer delay time is necessary, RNA51953, RNA51957, RNA51958 are used. In this case, the delay time is about 0.34 Cd (pF) s. 3. If the RNA51957 and the logic circuit share a common power source, type A (built-in load type) can be used whether a pull-up resistor is included in the logic circuit or not. 4. The logic circuit preferably should not have a pull-down resistor, but if one is present, add load resistor RL to overcome the pull-down resistor. 5. When the reset terminal in the logic circuit is of the low reset type, RNA51953 and RNA51957 are used and when the terminal is of the high reset type, RNA51958 are used. 6. When a negative supply voltage is used, the supply voltage side of RNA51957 and the GND side are connected to negative supply voltage respectively. Case of Using Reset Signal except Supply Voltage in the RNA51957 (a) Reset at ON (b) Reset at transistor ON Input RL VCC RESET Logic circuit Input GND Delay capacitor GND Cd R1 R2 RL VCC RESET Logic circuit GND Delay capacitor GND Cd R1 R2 Out put Out put RNA51957x RNA51957x Control signal Power- supply Power- supply Power- supply Power- supply Figure 2 Case of Using Reset Signal except Supply Voltage in the RNA51957 |
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