ASM1812

February 2005 rev 1.4 ASM1812 Low Power 5V µP Reset Active HIGH, Push-Pull Output Applications • • • • • • • Set-top boxes Cellular phones PDAs Energy management systems Embedded control systems Printers Single board computers General Description The ASM1812 is a voltage supervisory device with low-power, 5V µP Reset, active HIGH, Push-Pull output. Maximum supply current over temperature is a low 20µA. The ASM1812 issues an active HIGH 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 HIGH 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 ASM1812 is designed with a push-pull output stage and operates over the extended industrial temperature range. Devices are available in TO-92 and compact surface mount SOT-23 packages. Other low power products in this family include the ASM1810/ 11/15/16/17, ASM1233D and ASM1233M. Typical Operating Circuit VCC ASM1812 Microprocessor RESET RESET GND Key Features • • • • • • • • • 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 condition Active HIGH power-up reset Precision temperature-compensated voltage reference and comparator Eliminates external components TO-92 and compact surface mount SOT-23 package Push-Pull output for minimum current drain Operating temperature -40°C to +85°C Reference Supply Tolerance Bias Block Diagram VCC 2 ASM1812 + Delay 150ms Typical 1 - RESET 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 ASM1812 Pin Configuration TO-92 SOT-23 RESET 1 ASM1812-R ASM1812 3 GND VCC 2 1 2 3 Pin Description TO-92 Pin # 1 2 3 SOT-23 Pin Name Pin # 1 2 3 RESET VCC GND Active HIGH reset output Power supply input Ground Description Low Power 5V µP Reset Notice: The information in this document is subject to change without notice 2 of 9 February 2005 rev 1.4 ASM1812 Application Information Operation - Power Monitor The ASM1812 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 active (HIGH) 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 ~ ~ RESET VOL ASM1812 Microprocessor RESET RESET Figure 2: Timing Diagram: Power-Up Figure 1: Typical Application VCC tF VCCTP (MAX) VCCTP VCCTP (MIN) ~ ~ tRPD VOH RESET Slews with VCC ~ ~ RESET 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 February 2005 rev 1.4 ASM1812 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 = 1.2V to 5.5V and specifications are over the operating temperature range of -40°C to +85°C. All voltages are referenced toground Parameter Supply Voltage Output Voltage Output Current Output Current Operating Current VCC Trip Point (ASM1812R-5) VCC Trip Point (ASM1812R-10) VCC Trip Point (ASM1812R-15) Output Capacitance RESET Active Time VCC Detect to RESET HIGH VCC Slew Rate VCC Slew Rate VCC Detect to RESET LOW Symbol VCC VOH IOH IOL ICC VCCTP VCCTP VCCTP COUT tRESET tRPD tF tR tRPU tr = 5µs Conditions Min 1.2 Typ Max 5.5 Unit V V µA mA IOUT < 500 µA Output = 2.4V, VCC > 2.7V Output = 0.4V, VCC > 2.7V VCC < 5.5V, RESET output VCC - 0.5V VCC - 0.1V 350 +10 8 4.50 4.25 4.00 4.62 4.35 4.13 20 4.75 4.49 4.24 10 100 150 2 300 0 100 150 300 250 5 µA V V V pF ms µs µs 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 µP Reset Notice: The information in this document is subject to change without notice 4 of 9 February 2005 rev 1.4 ASM1812 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 µP Reset Notice: The information in this document is subject to change without notice 5 of 9 February 2005 rev 1.4 ASM1812 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 0.95 BSC 1.9 BSC 2.10 0.40 o 0 1.17 0.15 0.50 0.20 3.04 1.40 0.037 BSC 0.075 BSC 0.083 0.016 o 0 0.104 0.024 o 8 2.64 0.60 8 o NA NA Low Power 5V µP 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) ASM1812 Dimensions in Inches Min Max TO-92 A b C φD 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 µP Reset Notice: The information in this document is subject to change without notice 7 of 9 February 2005 rev 1.4 ASM1812 Ordering Codes Device Summary RESET Output Voltage (V) RESET Tolerance (%) RESET Time (ms) Part ** Number Push-Pull Output Stage SOT-23 Package RESET Polarity Package Marking TIN - LEAD DEVICES ASM1812R-5 ASM1812R-10 ASM1812R-15 LEAD FREE DEVICES ASM1812R-5F ASM1812R-10F ASM1812R-15F 4.62 4.35 4.13 RESET Output Voltage (V) 5 10 15 RESET Tolerance (%) 150 150 150 RESET Time (ms) HIGH HIGH HIGH KGLL KHLL KILL 4.62 4.35 4.13 5 10 15 150 150 150 HIGH HIGH HIGH RGLL RHLL RILL Part ** Number Push-Pull Output Stage TO-92 Package RESET Polarity Package Marking TIN - LEAD DEVICES ASM1812-5 ASM1812-10 ASM1812-15 LEAD FREE DEVICES ASM1812-5F ASM1812-10F ASM1812-15F 4.62 4.35 4.13 5 10 15 150 150 150 HIGH HIGH HIGH ASM1812-5F ASM1812-10F ASM1812-15F 4.62 4.35 4.13 5 10 15 150 150 150 HIGH HIGH HIGH ASM1812-5 ASM1812-10 ASM1812-15 ** 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 ASM1812 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: ASM1812 Document Version: 1.4 © Copyright 2003 Alliance Semiconductor Corporation. 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