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AMS811S Datasheet(PDF) 1 Page - Advanced Monolithic Systems Ltd |
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AMS811S Datasheet(HTML) 1 Page - Advanced Monolithic Systems Ltd |
1 / 8 page General Description The AMS811 / 812 are low-power microprocessor (µP) supervisory circuits used to monitor power sup- plies in µP and digital systems. They provide excellent circuit reliability and low cost by eliminating external components and adjustments when used with 5V- powered or 3V-powered circuits. The AMS811 / 812 also provide a debounced manual reset input. These devices perform a single function: They assert a reset signal whenever the VCC supply voltage falls below a preset threshold, keeping it asserted for at least 140ms after VCC has risen above the reset thresh- old. The only difference between the two devices is that the AMS811 has an active-low RESET output (which is guaranteed to be in the correct state for VCC down to 1V), while the AMS812 has an active-high RESET out- put. The reset comparator is designed to ignore fast transients on VCC. Reset thresholds are available for operation with a variety of supply voltages. Low supply current makes the AMS811 / 812 ideal for use in portable equipment. The devices come in a 4-pin SOT143 package. ________________________Applications Computers Controllers Intelligent Instruments Critical µP and µC Power Monitoring Portable/Battery-Powered Equipment Features ♦♦ Precision Monitoring of 3V, 3.3V, and 5V Power-Supply Voltages ♦♦ 6µA Supply Current ♦♦ 140ms Min Power-On Reset Pulse Width; R RE ES SE ET T Output ( AMS811), RESET Output (AMS812) ♦♦ Guaranteed Over Temperature ♦♦ Guaranteed R RE ES SE ET T Valid to VCC = 1V (AMS811) ♦♦ Power-Supply Transient Immunity ♦♦ No External Components ♦♦ 4-Pin SOT143 Package 1 2 4 3 VCC MR (RESET) RESET GND SOT143 TOP VIEW ( ) ARE FOR AMS812 NOTE: SEE LAST PAGE FOR MARKING INFORMATION. ___________________Pin Configuration VCC VCC RESET (RESET) RESET INPUT GND VCC GND μP ( ) ARE FOR AMS812 PUSHBUTTON SWITCH MR ___________Typical Operating Circuit PART* AMS811_EUS-T AMS812_EUS-T -40°C to +85°C -40°C to +85°C TEMP RANGE PIN-PACKAGE 4 SOT143 4 SOT143 _______________Ordering Information * This part offers a choice of five different reset threshold volt- ages. Select the letter corresponding to the desired nominal reset threshold voltage, and insert it into the blank to complete the part number. Devices are available in both leaded and lead-free packaging. Specify lead-free by replacing “-T” with “+T” when ordering. RESET THRESHOLD SUFFIX VOLTAGE (V) L 4.63 M 4.38 T 3.08 S 2.93 R 2.63 AMS811 AMS812 AMS811 AMS812 AMS811/812 1 Advanced Monolithic Systems http://www.ams-semitech.com |
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