ASM1811 February 2005 rev 1.4 Low Power 5V µP Reset Active LOW, Open - Drain Output General Description Applications The ASM1811 is a voltage supervisory device with a low-power, • Set-top boxes 5V µP Reset, active LOW, open-drain output. Maximum supply • Cellular phones current over temperature is a low 20µA. • PDAs • Energy management systems The ASM1811 generates an active LOW reset signal whenever • Embedded control systems the monitored supply is out of tolerance. A precision reference • Printers and comparator circuit monitor power supply (VCC) level. Tolerance level options are 5%, 10% and 15%. When an out-of- • Single board computers tolerance condition is detected, an internal power-fail signal is Typical Operating Circuit generated which forces an active LOW reset signal. After VCC returns to an in-tolerance condition, the reset signal remains VCC active for 150ms to allow the power supply and system microprocessor to stabilize. ASM1811 The ASM1811 is designed with a open-drain output stage and Microprocessor operates over the extended industrial temperature range. Devices are available in low cost TO-92 and compact surface RESET mount SOT-23 packages. Other low power products in this family include the ASM1810/ RESET GND 12/15/16/17, ASM1233D and ASM1233M. Block Diagram Key Features • Low Supply Current VCC •20 µA maximum (5.5 V) • Automatically restarts a microprocessor after power failure • 150ms reset delay after VCC returns to an in-tolerance con- • Active LOW power-up reset • Precision temperature-compensated voltage reference and dition 2 Eliminates external components • Low cost TO-92 and compact surface mount SOT-23 pack- • Operating temperature -40°C to +85°C 5.5KΩ 1 + - comparator • ASM1811 Supply Tolerance Bias Delay 150ms Typical Reference ages 3 GND 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 RESET ASM1811 February 2005 rev 1.4 Pin Configuration TO-92 SOT-23 ASM1811 RESET 1 ASM1811-R 3 VCC GND 2 1 2 3 Pin Description SOT-23 TO-92 Pin # Pin # 1 Pin Name Description 1 RESET Active LOW reset output 2 2 VCC Power supply input 3 3 GND Ground Low Power 5V µP Reset Notice: The information in this document is subject to change without notice 2 of 9 ASM1811 February 2005 rev 1.4 Application Information Operation - Power Monitor The ASM1811 detects out-of-tolerance power supply conditions. It resets a processor during power-up, power- tF VCC VCCTP (MAX) down and issues a reset to the system processor when the VCCTP monitored power supply voltage is below the reset threshold. VCCTP (MIN) When an out-of-tolerance VCC voltage is detected, the voltage has reached the selected tolerance. This allows the RESET tRPD ~ ~ RESET signal is asserted. On power-up, RESET is kept active (LOW) for approximately 150ms after the power supply power supply and microprocessor to stabilize before RESET is released. VOL tR VCCTP (MAX) VCCTP (MIN) ~ VCC Figure 2: Timing Diagram: Power-Down VCCTP tRPU VOH ~ RESET Figure 1: Timing Diagram: Power-Up Low Power 5V µP Reset Notice: The information in this document is subject to change without notice 3 of 9 ASM1811 February 2005 rev 1.4 Absolute Maximum Ratings Parameter Min Max Unit Voltage on VCC -0.5 7 V Voltage on RESET -0.5 VCC + 0.5 V Operating Temperature Range -40 85 °C 260 °C 125 °C 2 200 KV V Soldering Temperature (for 10 sec) Storage Temperature -55 ESD rating HBM MM NOTE: These are stress ratings only and functional use is not implied. Exposure to absolute maximum ratings for prolonged periods of time may affect device reliability. Electrical Characteristics Unless otherwise noted, VCC = 1.2V to 5.5V and specifications are over the operating temperature range of -40°C to +85°C. All voltages are referenced to ground Parameter Symbol Supply Voltage VCC Operating Current ICC Conditions Min Typ Max Unit 5.5 V 8 20 µA 1.2 VCC < 5.5V, RESET output open VCC Trip Point (ASM1811R-5) VCCTP 4.50 4.62 4.75 V VCC Trip Point (ASM1811R-10) VCCTP 4.25 4.35 4.49 V VCC Trip Point (ASM1811R-15) VCCTP 4.00 4.13 4.24 V RP 3.5 5.5 7.5 kΩ 10 pF 150 250 ms 2 5 µs Internal Pull-up Resistor Output Capacitance COUT RESET Active Time tRESET VCC Detect to RESET Low tRPD VCC Slew Rate (VCCTP (MAX) to VCCTP (MIN) VCC Slew Rate (VCCTP (MIN) to VCCTP (MAX) VCC Detect to RESET High 100 tF 300 µs tR 0 ns tRPU tr = 5µs 100 150 300 ms Note: The tF value is for reference in defining values for tRPD and should not be considered for proper operation or use. Low Power 5V µP Reset Notice: The information in this document is subject to change without notice 4 of 9 ASM1811 February 2005 rev 1.4 Family Selection Guide Part # RESET Voltage (V) RESET Time (ms) Output Stage RESET Polarity ASM1810 4.620, 4.370, 4.120 150 Push-Pull LOW ASM1811 4.620, 4.350, 4.130 150 Open-Drain LOW ASM1812 4.620, 4.350, 4.130 150 Push-Pull HIGH ASM1815 3.060, 2.880, 2.550 150 Push-Pull LOW ASM1816 3.060, 2.880, 2.550 150 Open-Drain LOW ASM1817 3.060, 2.880, 2.550 150 Push-Pull HIGH ASM1233D 4.625, 4.375, 4.125 350 Open-Drain LOW ASM1233M 4.625, 4.375, 2.720 350 Open-Drain LOW Low Power 5V µP Reset Notice: The information in this document is subject to change without notice 5 of 9 ASM1811 February 2005 rev 1.4 Package Dimension Plastic SOT-23 (3-Pin) D B E H e S A a L Inches Min C e1 A1 Millimeters Max Min Max Plastic SOT-23 (3-Pin) A 0.030 0.046 0.75 1.17 A1 0.002 0.006 0.05 0.15 B 0.012 0.020 0.30 0.50 C 0.003 0.008 0.08 0.20 D 0.110 0.120 2.80 3.04 E 0.047 0.055 1.20 1.40 e 0.037 BSC 0.95 BSC e1 0.075 BSC 1.9 BSC H 0.083 0.104 2.10 2.64 L 0.016 0.024 0.40 0.60 a 0 S o o 8 NA 0 o o 8 NA Low Power 5V µP Reset Notice: The information in this document is subject to change without notice 6 of 9 ASM1811 February 2005 rev 1.4 To-92 (3-Pin) Dimensions in Inches Min Max Dimensions in Millimeters Min Max TO-92 A 0.175 0.185 4.445 4.699 b 0.016 0.020 0.406 0.508 C 0.014 0.016 0.356 0.406 φD 0.175 0.185 4.445 4.699 E 0.138 0.144 3.505 3.658 e 0.098 0.102 2.489 2.591 e1 0.045 0.055 1.143 1.397 j 0.168 0.174 4.269 4.420 L 0.500 0.585 12.7 14.86 s 0.095 0.099 2.413 2.515 Low Power 5V µP Reset Notice: The information in this document is subject to change without notice 7 of 9 ASM1811 February 2005 rev 1.4 Ordering Information Device Summary RESET Output Voltage (V) RESET Tolerance (%) RESET Time (ms) Open-Drain ** Output Stage SOT-23 Package RESET Polarity Package Marking ASM1811R-5 4.62 5 150 LOW RDLL ASM1811R-10 4.35 10 150 LOW RELL ASM1811R-15 4.13 15 150 LOW RFLL ASM1811R-5F 4.62 5 150 LOW KDLL ASM1811R-10F 4.35 10 150 LOW KELL ASM1811R-15F 4.13 15 150 LOW KFLL Part *** Number RESET Output Voltage (V) RESET Tolerance (%) RESET Time (ms) Open-Drain ** Output Stage TO-92 Package RESET Polarity Package Marking ASM1811-5 4.62 5 150 LOW ASM1811-5 ASM1811-10 4.35 10 150 LOW ASM1811-10 ASM1811-15 4.13 15 150 LOW ASM1811-15 ASM1811-5F 4.62 5 150 LOW ASM1811-5F ASM1811-10F 4.35 10 150 LOW ASM1811-10F ASM1811-15F 4.13 15 150 LOW ASM1811-15F Part *** Number TIN - LEAD DEVICES LEAD FREE DEVICES TIN - LEAD DEVICES LEAD FREE DEVICES ** Internal 5.5kΩ resistor pull-up ** *Add /T to Part Number for Tape and Reel (i.e ASM18xx-x/T) LL- Lot Code Low Power 5V µP Reset Notice: The information in this document is subject to change without notice 8 of 9 ASM1811 Alliance Semiconductor Corporation 2575, Augustine Drive, Santa Clara, CA 95054 Tel: 408 - 855 - 4900 Fax: 408 - 855 - 4999 www.alsc.com Copyright © Alliance Semiconductor All Rights Reserved Part Number: ASM1811 Document Version: 1.4 © 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. Alliance 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 Alliance 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.