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M51954B Datasheet(PDF) 6 Page - Renesas Technology Corp |
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M51954B Datasheet(HTML) 6 Page - Renesas Technology Corp |
6 / 11 page M51953A,B/M51954A,B REJ03D0776-0200 Rev.2.00 Aug 20, 2007 Page 6 of 10 Example of Application Circuit Reset Circuit of M5195xx Series RL VCC M51953x M51954x RESET ( RESET) Logic circuit GND Delay capacitor GND Cd Power- supply Power- supply Output Figure 1 Reset Circuit of M5195xx Series Notes: 1. When the detecting supply voltage is 4.25 V, M51951, M51952, M51953 and M51954 are used. In this case, R1 and R2 are not necessary. When the voltage is anything except 4.25 V, M51955, M51956, M51957 and M51958 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. When the delay time is short, M51951, M51952, M51955 and M51956 are available. These ICs have a delay capacity and the delay time is about 200 µs. If a longer delay time is necessary, M51953, M51954, M51957 and M51958 are used. In this case, the delay time is about 0.34 × Cd (pF) µs. 3. If the M5195xx 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, M51951, M51953, M51955 and M51957 are used and when the terminal is of the high reset type, M51952, M51954, M51956 and M51958 are used. 6. When a negative supply voltage is used, the supply voltage side of M5195xx and the GND side are connected to negative supply voltage respectively. Case of Using Reset Signal except Supply Voltage in the M5195xx Series Out put RL VCC M5195xx (External delay capacitor type) M5195xx (External delay capacitor type) (a) Reset at ON RESET ( RESET) Logic circuit Out put GND Delay capacitor GND Cd RL VCC (b) Reset at transistor ON RESET ( RESET) Logic circuit GND Delay capacitor GND Cd Control signal Power- supply Power- supply Power- supply Power- supply Figure 2 Case of Using Reset Signal except Supply Voltage in the M5195xx Series |
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