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| November 2003 rev 1.0 ASM8500 Low Power 5V / 3.3V P Reset Active LOW, Open - Drain Output * * Printers Single board computers General Description The ASM8500 is a voltage supervisory device with a low-power, 5V/3.3V P Reset, active LOW, open-drain output. Maximum supply current over temperature is a low 6A. The ASM8500 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. Reset threshold tolerance level is 1.5%. When an out-of-tolerance condition is detected, an internal power-fail signal is generated which forces an active LOW reset signal. After VCC returns to an in-tolerance condition, the reset signal remains active for 1.5ms to allow the power supply and system microprocessor to stabilize. The ASM8500 is designed with a open-drain output stage and operates over the extended industrial temperature range. Devices are available in compact surface mount SOT-89 packages. Other low power products in this family include the ASM1810/ 11/12/15/16/17, ASM1233D and ASM1233M. Typical Operating Circuit VCC ASM8500 Microprocessor RESET RESET GND Block Diagram VCC Key Features * * * * * * * * Low Supply Current * 6 A maximum (5.5 V) Automatically restarts a microprocessor after power failure 1.5ms reset delay after VCC returns to an in-tolerance condition Active LOW power-up reset Precision temperature-compensated voltage reference and comparator Eliminates external components Compact surface mount SOT-89 package Operating temperature -40C to +85C Supply Tolerance Bias ASM8500 5 RESET + Reference Delay 1.5ms Typical GND Applications * * * * * Set-top boxes Cellular phones PDAs Energy management systems Embedded control systems 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 November 2003 rev 1.0 ASM8500 Pin Configuration 1 VCC 2 3 GND RESET Pin Description Pin # 1 2 3 Pin Name VCC GND RESET Description Power supply input Ground Active LOW reset output Low Power 5V / 3.3V P Reset Active LOW, Open - Drain Output Notice: The information in this document is subject to change without notice 2 of 7 November 2003 rev 1.0 ASM8500 Application Information Operation - Power Monitor The ASM8500 detects out-of-tolerance power supply conditions. It resets a processor during power-up, powerdown 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 power-up, RESET is kept voltage has reached the selected tolerance. This allows the power supply and microprocessor to stabilize before RESET is released. RESET VCC VCCTP (MAX) VCCTP VCCTP (MIN) tF tRPD tR VCCTP (MAX) VCCTP (MIN) VCCTP VOL Figure 2: Timing Diagram: Power-Down VCC tRPU VOH RESET Figure 1: Timing Diagram: Power-Up ~ ~ 3 of 7 active (LOW) for approximately 1.5ms after the power supply ~ ~ ~ ~ Low Power 5V / 3.3V P Reset Active LOW, Open - Drain Output Notice: The information in this document is subject to change without notice November 2003 rev 1.0 ASM8500 Absolute Maximum Ratings Parameter Voltage on VCC Voltage on RESET Operating Temperature Range Soldering Temperature (for 10 sec) Storage Temperature -55 Min -0.5 -0.5 -40 Max 7 VCC + 0.5 85 260 125 Unit V V C C C 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 -40C to +85C. All voltages are referenced to ground Parameter Supply Voltage Output Voltage Output Current Operating Current VCC Trip Point (ASM8500-42) VCC Trip Point (ASM8500-29) VCC Trip Point (ASM8500-27) Internal Pull-up Resistor Output Capacitance RESET Active Time VCC Detect to RESET Low VCC Slew Rate (VCCTP (MAX) to VCCTP (MIN) VCC Slew Rate (VCCTP (MIN) to VCCTP (MAX) VCC Detect to RESET High Symbol VCC VOH IOH ICC VCCTP VCCTP VCCTP RP COUT tRESET tRPD tF tR tRPU tr = 5s Conditions Min 1 Typ Max 5.5 Unit V V mA IOUT < 500 A Output = 0.4V, VCC > 2.7V VCC < 5.5V, RESET output open VCC - 0.5V +10 VCC - 0.1V 6 4.2 2.9 2.7 3.5 5.5 7.5 10 0.5 1.5 2 300 5 5 A V V V k pF ms s s 0 0.5 1.5 5 ns 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 / 3.3V P Reset Active LOW, Open - Drain Output Notice: The information in this document is subject to change without notice 4 of 7 November 2003 rev 1.0 ASM8500 Family Selection Guide Part # ASM1810 ASM1811 ASM1812 ASM1815 ASM1816 ASM1817 ASM1233D ASM1233M ASM8500 RESET Voltage (V) 4.620, 4.370, 4.120 4.620, 4.350, 4.130 4.620, 4.350, 4.130 3.060, 2.880, 2.550 3.060, 2.880, 2.550 3.060, 2.880, 2.550 4.625, 4.375, 4.125 4.625, 4.375, 2.720 4.2, 2.9, 2.7 RESET Time (ms) 150 150 150 150 150 150 350 350 1.5 Output Stage Push-Pull Open-Drain Push-Pull Push-Pull Open-Drain Push-Pull Open-Drain Open-Drain Open-Drain RESET Polarity LOW LOW HIGH LOW LOW HIGH LOW LOW LOW Low Power 5V / 3.3V P Reset Active LOW, Open - Drain Output Notice: The information in this document is subject to change without notice 5 of 7 November 2003 rev 1.0 ASM8500 Package Dimensions Plastic SOT-89 D D1 H Polish E HE A1 S1 e Matte Finish C b b1 b Polish Dimension in Millimeters Symbol Min A A1 b b1 C D D1 HE E e H S1 1.40 0.89 0.36 0.41 0.35 4.40 1.35 2.29 2.90 0.35 1.40 Max 1.60 0.52 0.56 0.44 4.60 1.83 4.25 2.60 3.10 0.70 1.60 Dimensions in Inches Min 0.0551 0.0350 0.0142 0.0161 0.0138 0.1732 0.0531 0.0902 0.1142 0.0138 0.0551 Max 0.0630 0.0205 0.0220 0.0173 0.1811 0.0720 0.1673 0.1024 0.1220 0.0276 0.0630 Low Power 5V / 3.3V P Reset Active LOW, Open - Drain Output Notice: The information in this document is subject to change without notice 6 of 7 ASM8500 Alliance Semiconductor Corporation 2575, Augustine Drive, Santa Clara, CA 95054 Tel: 408 - 855 - 4900 Fax: 408 - 855 - 4999 www.alsc.com Copyright (c) Alliance Semiconductor All Rights Reserved Preliminary Information Part Number: ASM8500 Document Version: 1.0 (c) 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. |
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