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SS809-40GU Arkusz danych(PDF) 7 Page - Silicon Standard Corp. |
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SS809-40GU Arkusz danych(HTML) 7 Page - Silicon Standard Corp. |
7 / 8 page www.SiliconStandard.com 7 of 8 SS809/810G 9/20/2006 Rev.3.01 DETAILED DESCRIPTIONS OF TECHNICAL TERMS RESET OUTPUT The µP will be activated at a valid reset state. These µP supervisory circuits assert reset to prevent code execution errors during power-up, power-down, or brownout conditions. RESET is guaranteed to be a logic low for VTH>VCC>0.9V. Once VCC exceeds the reset threshold, an internal timer keeps RESET low for the reset timeout period; after this interval, RESET goes high. If a brownout condition occurs (VCC drops below the reset threshold), RESET goes low. Any time VCC goes below the reset threshold, the internal timer resets to zero, and RESET goes low. The internal timer is activated after VCC returns above the reset threshold, and RESET remains low for the reset timeout period. BENEFITS OF HIGHLY ACCURATE RESET THRESHOLD The SS809G and SS810G with specified voltage as 5V ± 10% or 3V ±10% are ideal for systems using a 5V±5% or 3V ±5% power supply. The reset is guaranteed to assert after the power supply falls out of regulation, but before the power drops below the minimum specified operating voltage range of the system ICs. The pre-trimmed thresholds reduce the range over which an undesirable reset may occur. APPLICATION INFORMATION NEGATIVE-GOING VCC TRANSIENTS In addition to issuing a reset to the µP during power-up, power-down, and brownout conditions, the SS809G series are relatively resistant to short-duration negative-going VCC transients. ENSURING A VALID RESET OUTPUT DOWN TO VCC=0 When VCC falls below 0.9V, the SS809G RESET output no longer sinks current; it becomes an open circuit. In this case, high-impedance CMOS logic inputs connected to RESET can drift to undetermined voltages. Therefore, the SS809G/810G are perfect for most CMOS applications down to VCC of 0.9V. However in applications where RESET must be valid down to 0V, adding a pull-down resistor to RESET causes any leakage currents to flow to ground, holding RESET low. INTERFACING TO A MICROPROCESSOR WITH BIDIRECTIONAL RESET PINS The RESET output on the SS809N is open drain, and 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-up resistor allows either device to assert reset. |
Podobny numer części - SS809-40GU |
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Podobny opis - SS809-40GU |
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