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| February 2005 rev 1.4 ASM1810 Low Power, 5V P Reset - Active LOW, Push-Pull Output Key Features * * * Low Supply Current *20 A maximum (5.5 V) Automatically restarts a microprocessor after power failure 150ms 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 Low cost TO-92 and compact surface mount SOT-23 package Push-Pull output for minimum current drain Operating temperature -40C to +85C General Description The ASM1810 is a voltage supervisor with low-power, 5V P active LOW Reset, Push-Pull output. Maximum supply current over temperature is a low 20A. 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-oftolerance 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 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. Applications * * * * * * * Set-top boxes Cellular phones PDAs Energy management systems Embedded control systems Printers Single board computers Typical Operating Circuit Block Diagram VCC 2 VCC ASM1810 Microprocessor RESET RESET Supply Tolerance Bias ASM1810 + Reference Delay 150ms Typical 1 RESET GND 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 February 2005 rev 1.4 ASM1810 Pin Configuration TO-92 SOT-23 ASM1810 RESET 1 ASM1810-R 3 GND VCC 2 1 2 3 Pin Description SOT-23 Pin # 1 2 3 TO-92 Pin Name Pin # 1 2 3 RESET VCC GND Active LOW reset output Power supply input Ground Description Low Power, 5V P Reset Notice: The information in this document is subject to change without notice 2 of 9 February 2005 rev 1.4 ASM1810 Application Information Operation - Power Monitor The ASM1810 detects out-of-tolerance power supply conditions. It resets a processor during power-up, power-down 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 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. VCC VCCTP (MIN) tR VCCTP (MAX) VCCTP ~ ~ tRPU VOH ASM1810 Microprocessor RESET 100k RESET ~ ~ RESET Figure 2: Timing Diagram: Power-Up Figure 1: RESET Valid to 0V VCC VCC VCCTP (MAX) VCCTP VCCTP (MIN) tF Output Conditions The ASM1810 active LOW reset signal is valid as long as VCC 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 VCC approaching 0V. During both power up and down, this configuration will draw current when the RESET is in the high state. A value of 100k should be adequate to maintain a valid connection. RESET tRPD VOL Figure 3: Timing Diagram: Power-Down ~ ~ 3 of 9 Low Power, 5V P Reset Notice: The information in this document is subject to change without notice February 2005 rev 1.4 ASM1810 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 ESD rating HBM MM 2 200 KV V 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 = 1.25V to 5.5V and specifications are over the operating temperature range of -400c to +850c. All voltages are referenced to ground Parameter Supply voltage Output voltage Output Current Output Current Operating Current VCC Trip Point (ASM1810R-5) VCC Trip Point (ASM1810R-10) VCC Trip Point (ASM1810R-15) Output Capacitance 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 IOL ICC VCCTP VCCTP VCCTP COUT tRPD tF tR tRPU Conditions Min 1.2 Typ Max 5.5 Unit V V A mA IOUT < 500 A Output = 2.4V, VCC > 2.7V Output = 0.4V, VCC > 2.7V VCC < 5.5V, RESET output open VCC - 0.5V VCC - 0.1V 350 +10 8 4.50 4.25 4.00 4.62 4.37 4.12 20 4.75 4.49 4.24 10 2 300 5 A V V V pF s s 0 tr = 5s 100 150 300 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 P Reset Notice: The information in this document is subject to change without notice 4 of 9 February 2005 rev 1.4 ASM1810 Family Selection Guide Part # ASM1810 ASM1811 ASM1812 ASM1815 ASM1816 ASM1817 ASM1233D ASM1233M 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 RESET Time (ms) 150 150 150 150 150 150 350 350 Output Stage Push-Pull Open-Drain Push-Pull Push-Pull Open-Drain Push-Pull Open-Drain Open-Drain RESET Polarity LOW LOW HIGH LOW LOW HIGH LOW LOW Low Power, 5V P Reset Notice: The information in this document is subject to change without notice 5 of 9 February 2005 rev 1.4 ASM1810 Package Dimension Plastic SOT-23 (3-Pin) D B E H S e A C L a A1 e1 Inches Millimeters Min Max Min Max Plastic SOT-23 (3-Pin) A A1 B C D E e e1 H L a S 0.030 0.002 0.012 0.003 0.110 0.047 0.046 0.006 0.020 0.008 0.120 0.055 0.75 0.05 0.30 0.08 2.80 1.20 1.17 0.15 0.50 0.20 3.04 1.40 0.037 BSC 0.075 BSC 0.083 0.016 0.104 0.024 0.95 BSC 1.9 BSC 2.10 0.40 2.64 0.60 0 o 8 NA o 0 o 8 NA o Low Power, 5V P Reset Notice: The information in this document is subject to change without notice 6 of 9 February 2005 rev 1.4 To-92 (3-Pin) ASM1810 Dimensions in Inches Min Max TO-92 A b C D E e e1 j L s 0.175 0.016 0.014 0.175 0.138 0.098 0.045 0.168 0.500 0.095 0.185 0.020 0.016 0.185 0.144 0.102 0.055 0.174 0.585 0.099 Dimensions in Millimeters Min Max 4.445 0.406 0.356 4.445 3.505 2.489 1.143 4.269 12.7 2.413 4.699 0.508 0.406 4.699 3.658 2.591 1.397 4.420 14.86 2.515 Low Power, 5V P Reset Notice: The information in this document is subject to change without notice 7 of 9 February 2005 rev 1.4 ASM1810 Ordering Information Device Summary RESET Output Voltage (V) RESET Tolerance (%) RESET Time (ms) Push-Pull Output Stage SOT-23 Package RESET Polarity Part ** Number Package Marking TIN - LEAD DEVICES ASM1810R-5 ASM1810R-10 ASM1810R-15 LEAD FREE DEVICES ASM1810R-5F ASM1810R-10F ASM1810R-15F 4.62 4.37 4.12 RESET Output Voltage (V) 5 10 15 RESET Tolerance (%) 150 150 150 RESET Time (ms) Push-Pull Output Stage TO-92 Package LOW LOW LOW RESET Polarity KALL KBLL KCLL 4.62 4.37 4.12 5 10 15 150 150 150 LOW LOW LOW RALL RBLL RCLL Part ** Number Package Marking TIN - LEAD DEVICES ASM1810-5 ASM1810-10 ASM1810-15 LEAD FREE DEVICES ASM1810-5F ASM1810-10F ASM1810-15F 4.62 4.37 4.12 5 10 15 150 150 150 LOW LOW LOW ASM1810-5F ASM1810-10F ASM1810-15F 4.62 4.37 4.12 5 10 15 150 150 150 LOW LOW LOW ASM1810-5 ASM1810-10 ASM1810-15 ** Add /T to Part Number for Tape and Reel (i.e ASM18xx-x/T) LL - Lot Code Low Power, 5V P Reset Notice: The information in this document is subject to change without notice 8 of 9 ASM1810 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 Part Number: ASM1810 Document Version: 1.4 (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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