ASM1810 February 2005 rev 1.4 Low Power, 5V µP Reset - Active LOW, Push-Pull Output General Description Key Features The ASM1810 is a voltage supervisor with low-power, 5V µP • active LOW Reset, Push-Pull output. Maximum supply current over temperature is a low 20µA. Low Supply Current •20 µA maximum (5.5 V) • Automatically restarts a microprocessor after power failure • 150ms reset delay after VCC returns to an in-tolerance con- the monitored supply is out of tolerance. A precision reference • Active LOW power-up reset and comparator circuit monitor power supply (VCC) level. • Precision temperature-compensated voltage reference and The ASM1810 generates an active LOW reset signal whenever dition comparator Tolerance level options are 5%, 10% and 15%. When an out-oftolerance condition is detected, an internal power-fail signal is • Eliminates external components generated which forces an active LOW reset signal. After VCC • Low cost TO-92 and compact surface mount SOT-23 pack- active for 150ms to allow the power supply and system • Push-Pull output for minimum current drain microprocessor to stabilize. • Operating temperature -40°C to +85°C The ASM1810 is designed with a push-pull output stage and Applications operates over the extended industrial temperature range. • Set-top boxes Devices are available in low cost TO-92 and compact surface • Cellular phones mount SOT-23 packages. • PDAs age returns to an in-tolerance condition, the reset signal remains • Energy management systems Other low power products in this family include the ASM1811/ • Embedded control systems 12/15/16/17, ASM1233D and ASM1233M. • Printers • Single board computers Block Diagram Typical Operating Circuit VCC 2 VCC ASM1810 + Microprocessor RESET ASM1810 Supply Tolerance Bias RESET - Delay 150ms Typical Reference 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 1 RESET ASM1810 February 2005 rev 1.4 Pin Configuration TO-92 SOT-23 ASM1810 RESET 1 ASM1810-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 ASM1810 February 2005 rev 1.4 Application Information Operation - Power Monitor The ASM1810 detects tR out-of-tolerance power supply VCCTP (MAX) 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 VCCTP VCCTP (MIN) tRPU VCC and microprocessor to stabilize before RESET is released. VOH RESET Microprocessor RESET ~ ASM1810 Figure 2: Timing Diagram: Power-Up RESET 100kΩ Figure 1: RESET Valid to 0V VCC tF VCC VCCTP (MAX) VCCTP 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 RESET tRPD ~ ~ VCCTP (MIN) Output Conditions 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 100kΩ should be VOL adequate to maintain a valid connection. Figure 3: Timing Diagram: Power-Down Low Power, 5V µP Reset Notice: The information in this document is subject to change without notice 3 of 9 ASM1810 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 = 1.25V to 5.5V and specifications are over the operating temperature range of -400c to +850c. All voltages are referenced to ground Parameter Symbol Conditions Supply voltage VCC Output voltage VOH IOUT < 500 µA Output Current IOH Output = 2.4V, VCC > 2.7V Output Current IOL Output = 0.4V, VCC > 2.7V Operating Current ICC VCC < 5.5V, RESET output open Min Typ 1.2 VCC - 0.5V Max Unit 5.5 V VCC - 0.1V V 350 µA +10 mA 8 20 µA VCC Trip Point (ASM1810R-5) VCCTP 4.50 4.62 4.75 V VCC Trip Point (ASM1810R-10) VCCTP 4.25 4.37 4.49 V VCC Trip Point (ASM1810R-15) VCCTP 4.00 4.12 4.24 V Output Capacitance COUT 10 pF VCC Detect to RESET Low tRPD 5 µs VCC Slew Rate (VCCTP (MAX) to VCCTP (MIN) VCC Slew Rate (VCCTP (MIN) to VCCTP (MAX) VCC Detect to RESET High 2 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 ASM1810 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 ASM1810 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 ASM1810 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 ASM1810 February 2005 rev 1.4 Ordering Information Device Summary Part ** Number RESET Output Voltage (V) RESET Tolerance (%) RESET Time (ms) Push-Pull Output Stage SOT-23 Package RESET Polarity Package Marking TIN - LEAD DEVICES ASM1810R-5 4.62 5 150 LOW RALL ASM1810R-10 4.37 10 150 LOW RBLL ASM1810R-15 4.12 15 150 LOW RCLL ASM1810R-5F 4.62 5 150 LOW KALL ASM1810R-10F 4.37 10 150 LOW KBLL ASM1810R-15F 4.12 15 150 LOW KCLL Part ** Number RESET Output Voltage (V) RESET Tolerance (%) RESET Time (ms) Push-Pull Output Stage TO-92 Package RESET Polarity Package Marking LEAD FREE DEVICES TIN - LEAD DEVICES ASM1810-5 4.62 5 150 LOW ASM1810-5 ASM1810-10 4.37 10 150 LOW ASM1810-10 ASM1810-15 4.12 15 150 LOW ASM1810-15 ASM1810-5F 4.62 5 150 LOW ASM1810-5F ASM1810-10F 4.37 10 150 LOW ASM1810-10F ASM1810-15F 4.12 15 150 LOW ASM1810-15F LEAD FREE DEVICES ** 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 ASM1810 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: ASM1810 Document Version: 1.4 © Copyright 2003 Alliance Semiconductor Corporation. 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