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AMS803S Datasheet(PDF) 2 Page - Advanced Monolithic Systems Ltd |
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AMS803S Datasheet(HTML) 2 Page - Advanced Monolithic Systems Ltd |
2 / 8 page Pin Configuration Pin Description Pin Type Description VCC - Supply Voltage. Reset is asserted when VCC drops below the Reset Threshold Voltage (VRST). Reset remains asserted until VCC rises above VRST and keep asserted for the duration of the Reset Timeout Period (tRS) once VCC rises above VRST. GND - Ground RESET O Active-Low Reset Output (Push-Pull). It goes low when Vcc is below the reset threshold. It remains low for about 200ms after Vcc rises above the reset threshold (VRST). Functional Description Reset Output A microprocessor ( µP) reset input starts the µP in a known state. Whenever the µP is in an unknown state, it should be held in reset. The supervisory circuits assert reset during power-up and prevent code execution errors during power-down or brownout conditions. On power-up, once Vcc reaches about 1.0V, /RESET is a guaranteed logic low of 0.4V or less. As Vcc rises, /RESET stays low. When Vcc rises above the reset threshold, an internal timer releases /RESET after about 200ms. /RESET pulses low whenever Vcc drops below the reset threshold, i.e. brownout condition. If brownout occurs in the middle of a previously initiated reset pulse, guaranteed to be 0.4V or less until Vcc drops below 1.0V. Reset Timing Diagram shows the timing relationship. 1 2 VCC GND RESET 3 SOT23-3 AMS803/09/10XT AMS803/09/10 Advanced Monolithic Systems http://www.ams-semitech.com 2 |
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