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ASM811TEUS-T Datasheet(PDF) 2 Page - Alliance Semiconductor Corporation |
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ASM811TEUS-T Datasheet(HTML) 2 Page - Alliance Semiconductor Corporation |
2 / 10 page 2 of 10 Notice: The information in this document is subject to change without notice 4 Pin µP Voltage Supervisor with Manual Reset ASM811, ASM812 October 2003 rev 1.0 Pin Diagram: Block Diagram Pin Description Pin # Pin Name Function ASM811 ASM812 1 1 GND Ground. 2 - RESET RESET is asserted LOW if VCC falls below VTH and remains LOW for TRST after VCC exceeds the Threshold. In addition, RESET is active LOW as long as the manual reset is low. -2 RESET RESET is asserted HIGH if VCC falls below VTH and remains HIGH for TRST after VCC exceeds the threshold. In addition, RESET is active HIGH as long as the manual reset is low. 33 MR Manual Reset Input. A logic LOW on MR asserts reset. Reset remains active as long as MR is LOW and for TMRST after MR returns HIGH. The active low input has an internal 20kΩ pull-up resistor. The input should be left open if not used. It can be driven by TTL or CMOS logic or shorted to ground by a switch. 44 VCC Power supply input voltage (3.0V, 3.3V, 5.0V) Detailed Description A proper reset input enables a microprocessor / microcontroller to start in a known state. ASM811/812 assert reset to prevent code execution errors during power-up, power- down and brown-out conditions. Reset Timing The reset signal is asserted- LOW for the ASM811 and HIGH for the ASM812- when the VCC supply voltage falls below the threshold trip voltage and remains asserted for 140ms minimum after the VCC has risen above the threshold. Manual Reset (MR) Input A logic low on MR assserts RESET LOW on the ASM811 and RESET HIGH on the ASM812. MR is internally pulled high through a 20k Ω resistor and can be driven by TTL/CMOS gates or with open collector/drain outputs. MR can be left open if not used. MR may be connected to ground through a normally- open momentary switch without an external debounce circuit. A 0.1µF capacitor from MR to ground can be added for additional noise immunity. 1 2 3 SOT143 ASM811 (ASM812) GND RESET VCC (RESET) 4 MR + - RESET Generator - + VCC RESET (RESET) GND ASM811 (ASM812) 4.38V 4.00V 3.08V 2.93V 2.63V 4.38V 4.63V MR 20k Ω VCC |
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