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Alliance Semiconductor ASM161 ASM162 P Supervisory Circuit handbook

1. implied Exposure to absolute maximum ratings for prolonged periods of time may affect device reliability Electrical Characteristics Unless otherwise noted VCC 1 25V to 5 5V and specifications are over the operating temperature range of 40 c to 85 c All voltages are referenced to ground Parameter Supply voltage Conditions Output voltage lout lt 500 uA Output Current Output 2 4V Vec gt 2 7V Output Current Output 0 4V Veg gt 2 7V Operating Current Vcc lt 5 5V RESET output open Vec Trip Point ASM1810R 5 Vec Trip Point ASM1810R 10 Vec Trip Point ASM1810R 15 Output Capacitance Vec Detect to RESET Low Vcc Slew Rate Vectp MAX to Vectp MIN Vec Slew Rate Vectp MIN to Vectp MAX tR Vec Detect to RESET High treu t Sus Note The tp value is for reference in defining values for tapp and should not be considered for proper operation or use 4 of 9 Low Power 5V uP Reset Notice The information in this document is subject to change without notice ASM1810 February 2005 P lt E OS rev 1 4 Family Selection Guide RESET Time RESET Voltage V ee Output Stage RESET Polarity ASM1810 4 620 4 370 4 120 Push Pull ASM1811 4 620 4 350 4 130 Open Drain ASM1812 4 620 4 350 4 130 Push Pull ASM1815 3 060 2 880 2 550 Push Pull ASM1816 3 060 2 880 2
2. 2 78 A SM 1810f Nv A February 2005 rev 1 4 ey ASM1810 Low Power 5V uP Reset Active LOW Push Pull Output General Description The ASM1810 is a voltage supervisor with low power 5V uP active LOW Reset Push Pull output Maximum supply current over temperature is a low 20UA The ASM1810 generates an active LOW reset signal whenever the monitored supply is out of tolerance A precision reference and comparator circuit monitor power supply Vcc level Tolerance level options are 5 10 and 15 When an out of tolerance condition is detected an internal power fail signal is generated which forces an active LOW reset signal After Voc returns to an in tolerance condition the reset signal remains active for 150ms to allow the power supply and system microprocessor to stabilize The ASM1810 is designed with a push pull output stage and operates over the extended industrial temperature range Devices are available in low cost TO 92 and compact surface mount SOT 23 packages Other low power products in this family include the ASM1811 12 15 16 17 ASM1233D and ASM1233M Typical Operating Circuit Vec ASM1810 Microprocessor RESET Key Features e Low Supply Current 20 pA maximum 5 5 V e Automatically restarts a microprocessor after power failure e 150ms reset delay after Vcc returns to an in tolerance con dition e Active LOW power up reset e Precision temperature compensated voltage r
3. 550 Open Drain ASM1817 3 060 2 880 2 550 Push Pull ASM1233D 4 625 4 375 4 125 Open Drain ASM1233M 4 625 4 375 2 720 Open Drain 5 of 9 Low Power 5V uP Reset Notice The information in this document is subject to change without notice ASM1810 February 2005 Al B PN rev 1 4 Package Dimension Plastic SOT 23 3 Pin D gt Pig ssai Ro Ka pei Poi 4 a 7e el_ 4 Al A L e Min Max Min Plastic SOT 23 3 Pin 0 030 0 046 0 75 1 17 0 002 0 006 0 05 0 15 0 012 0 020 0 30 0 50 0 003 0 008 0 08 0 20 0 110 0 120 2 80 3 04 0 047 0 055 1 20 1 40 0 037 BSC 0 95 BSC 0 075 BSC 1 9 BSC 0 083 0 104 2 10 2 64 0 016 0 024 0 40 0 60 0 8 0 8 6 of 9 Low Power 5V uP Reset Notice The information in this document is subject to change without notice ASM1810 February 2005 P lt E ES rev 1 4 To 92 3 Pin Dimensions in Millimeters Dimensions in Inches 7 of 9 Low Power 5V uP Reset Notice The information in this document is subject to change without notice ASM1810 February 2005 P lt E OS rev 1 4 Ordering Information Device Summary RESET Push Pull Part Number Outp
4. eference and comparator e Eliminates external components e Low cost TO 92 and compact surface mount SOT 23 pack age e Push Pull output for minimum current drain e Operating temperature 40 C to 85 C Applications e Set top boxes e Cellular phones e PDAs e Energy management systems e Embedded control systems e Printers Single board computers Block Diagram Vcc 62 ASM1810 upply Tolerance Bias Reference Alliance Semiconductor 2575 Augustine Drive Santa Clara CA 95054 Tel 408 855 4900 Fax 408 855 4999 www alsc com Notice The information in this document is subject to change without notice ASM1810 February 2005 P lt E ES rev 1 4 Pin Configuration TO 92 SOT 23 ASM1810 RESET ASM1810 R 3 GND Vee Pin Description Pin Name Description Active LOW reset output Power supply input Ground 2 of 9 Low Power 5V uP Reset Notice The information in this document is subject to change without notice February 2005 Re eee ee Ta ee ee ee ee ee PE rev 1 4 Application Information Operation Power Monitor The ASM1810 detects supply conditions It resets a processor during power up power down out of tolerance power and issues a reset to the system processor when the monitored power supply voltage is below the reset threshold When an out of tolerance Vcc voltage is detected the RESET signal is asserted On po
5. lliance reserves the right to make changes to this document and its products at any time without notice Alliance assumes no responsibility for any errors that may appear in this document The data contained herein represents Alliance s best data and or estimates at the time of issuance Alliance reserves the right to change or correct this data at any time without notice If the product described herein is under development significant changes to these specifications are possible The information in this product data sheet is intended to be general descriptive information for potential customers and users and is not intended to operate as or provide any guarantee or warrantee to any user or customer Alliance does not assume any responsibility or liability arising out of the application or use of any product described herein and disclaims any express or implied warranties related to the sale and or use of Alliance products including liability or warranties related to fitness for a particular purpose merchantability or infringement of any intellectual property rights except as express agreed to in Alliance s Terms and Conditions of Sale which are available from Alliance All sales of Alliance products are made exclusively according to Alliance s Terms and Conditions of Sale The purchase of products from Alliance does not convey a license under any patent rights copyrights mask works rights trademarks or any other intellectual property rights of Allia
6. nce or third parties Alliance does not authorize its products for use as critical components in life supporting systems where a malfunction or failure may reasonably be expected to result in significant injury to the user and the inclusion of Alliance products in such life supporting systems implies that the manufacturer assumes all risk of such use and agrees to indemnify Alliance against all claims arising from such use
7. ut RESET RESET SOT 23 RESET Output RE Polarity Package Marking Tolerance Time ms Voltage V Stage TIN LEAD DEVIC ASM1810R 5 ASM1810R 10 4 37 ASM1810R 15 4 12 LEAD FREE DEVICES ASM1810R 5F 4 62 ASM1810R 10F 4 37 ASM1810R 15F 4 12 RESET Push Pull Part Number Output RESET RESET TO 92 RESET Output z 0 Voltage V Tolerance Time ms Stage Package Polarity Package Marking TIN LEAD DEVIC ASM1810 5 ASM1810 5 ASM1810 10 4 37 ASM1810 10 ASM1810 15 4 12 ASM1810 15 LEAD FREE DEVICES ASM1810 5F 4 62 5 150 ASM1810 5F ASM1810 10F 4 37 10 150 ASM1810 10F ASM1810 15F 4 12 15 150 ASM1810 15F Add T to Part Number for Tape and Reel i e ASM18xx x T LL Lot Code 8 of 9 Low Power 5V uP Reset Notice The information in this document is subject to change without notice ASM1810 J A A Alliance Semiconductor Corporation Copyright Alliance Semiconductor 2575 Augustine Drive All Rights Reserved Santa Clara CA 95054 Part Number ASM1810 Tel 408 855 4900 Document Version 1 4 Fax 408 855 4999 www alsc com Copyright 2003 Alliance Semiconductor Corporation All rights reserved Our three point logo our name and Intelliwatt are trademarks or registered trademarks of Alliance All other brand and product names may be the trademarks of their respective companies A
8. wer up RESET is kept active LOW for approximately 150ms after the power supply voltage has reached the selected tolerance This allows the power supply and microprocessor to stabilize before RESET is released Microprocessor RESET Figure 1 RESET Valid to OV Vcc Output Conditions The ASM1810 active LOW reset signal is valid as long as Voc remains above 1 2V However the RESET output on the ASM1810 uses a push pull drive stage that can maintain a valid output below 1 2V To sink current with Vcc below 1 2V a resistor can be connected from the reset pin RESET to Ground see Figure 1 This configuration will give a valid value on the RESET output with Vec approaching OV During both power up and down this configuration will draw current when the RESET is in the high state A value of 100kQ should be adequate to maintain a valid connection i A ASM1810 Vec RESET _ Figure 2 Timing Diagram Power Up Vecre MAX RESET Figure 3 Timing Diagram Power Down Low Power 5V uP Reset Notice The information in this document is subject to change without notice ASM1810 February 2005 i N rev 1 4 Absolute Maximum Ratings Parameter Voltage on Vee Voltage on RESET Operating Temperature Range Soldering Temperature for 10 sec Storage Temperature ESD rating NOTE These are stress ratings only and functional use is not

Alliance Semiconductor ASM161 ASM162 P Supervisory Circuit handbook

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