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SSR809N Datasheet(PDF) 8 Page - Sangdest Microelectronic (Nanjing) Co., Ltd |
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SSR809N Datasheet(HTML) 8 Page - Sangdest Microelectronic (Nanjing) Co., Ltd |
8 / 10 page Technical Data 3-Pin Microprocessor Reset Circuits Data Sheet N1589 Rev. - • China - Germany - Korea - Singapore - United States • • http://www.smc-diodes.com - sales@ smc-diodes.com • SSR809N SSR809P/SSR810P Application Information NEGATIVE-GOING VCC TRANSIENTS In addition to issuing a reset to the μP during power-up, power-down, and brownout conditions, SSR809P series are relatively resistant to short-duration negative-going VCC transient. ENSURING A VALID RESET OUTPUT DOWN TO VCC=0 When VCC falls below 0.9V, SSR809P RESET ——————— output no longer sinks current; it becomes an open circuit. In this case, high-impedance CMOS logic inputs connecting to RESET ——————— can drift to undetermined voltages. Therefore, SSR809P/SSR810P with CMOS is perfect for most applications of VCC below 0.9V. However in applications where RESET ——————— must be valid down to 0V, adding pull-down resistor to RESET ——————— causes any leakage currents to flow to ground, holding RESET ——————— low. INTERFACING TO μP WITH BIDIRECTIONAL RESET PINS The RESET output on the SSR809N is open drain, this device interfaces easily with μPs that have bidirectional reset pins. Connecting the μP supervisor’s RESET ——————— output directly to the microcontroller’s RESET ——————— pin with a single pull-resistor allows either device to assert reset. Application Circuit |
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