ASM1817 February 2005 rev 1.5 Low Power, 3.3V/3.0V µP Reset, Active HIGH, Push-Pull Output General Description Applications The ASM1817 voltage supervisory device with low-power, 3.3V/ • Set-top boxes 3.0V µP Reset, active HIGH, Push-Pull output. Maximum • Cellular phones supply current over temperature is a low 15µA (at 3.6V). • PDAs • Energy management systems The ASM1817 generates an active HIGH 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 20% percent. When • Single board computers an out-of-tolerance condition is detected, an internal power-fail Typical Operating Circuit signal is generated which forces an active HIGH reset signal. After VCC returns to an in-tolerance condition, the reset signal VCC remains active for 150ms to allow the power supply and system microprocessor to stabilize. ASM1817 The ASM1817 is designed with a push-pull output stage and Microprocessor operates over the extended industrial temperature range. Devices are available in TO-92 and compact surface mount RESET SOT-23 packages. Other low power products in this family include the ASM1810/ RESET GND 11/12/15/16, ASM1233D and ASM1233M. Key Features • Block Diagram Low Supply Current •20 µA maximum (5.5 V) VCC •15 µA maximum (3.6 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 • 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 Supply Tolerance Bias ASM1817 + - comparator Delay 150ms Typical Reference 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 February 2005 ASM1817 rev 1.5 Pin Configuration TO-92 SOT-23 RESET ASM1817 1 ASM1817-R VCC 3 GND 2 1 2 3 Pin Description TO-92 SOT-23 Pin # Pin # 1 Pin Name Description 1 RESET Active HIGH reset output 2 2 VCC Power supply input 3 3 GND Ground Low Power, 3.3V/3.0V µP Reset Notice: The information in this document is subject to change without notice 2 of 9 ASM1817 February 2005 rev 1.5 Application Information tR Operation - Power Monitor The ASM1817 detects VCCTP (MAX) out-of-tolerance power supply conditions. It resets a processor during power-up, power- VCCTP VCCTP (MIN) 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 tRPU VCC active (HIGH) for approximatley 150ms after the power supply voltage has reached the selected tolerance. This ~ ~ allows the power supply and microprocessor to stablize before RESET is released. VOL RESET ASM1817 Figure 2: Timing Diagram: Power-Up Microprocessor RESET RESET VCC Figure 1: Typical Application tF VCCTP (MAX) VCCTP VCCTP (MIN) ~~ tRPD VOH ~~ RESET RESET Slews with VCC Figure 3: Timing Diagram: Power-Down Low Power, 3.3V/3.0V µP Reset Notice: The information in this document is subject to change without notice 3 of 9 February 2005 ASM1817 rev 1.5 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 Conditions Min Typ Max Unit 5.5 V 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 8 20 µA Operating Current ICC VCC < 3.6V, RESET output open 6 15 µA 1.2 VCC - 0.5V VCC - 0.1V V 350 µA +10 mA VCC Trip Point (ASM1817R-5) VCCTP 2.98 3.06 3.15 V VCC Trip Point (ASM1817R-10) VCCTP 2.80 2.88 2.97 V VCC Trip Point (ASM1817R-20) VCCTP 2.47 2.55 2.64 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 100 150 250 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, 3.3V/3.0V µP Reset Notice: The information in this document is subject to change without notice 4 of 9 February 2005 ASM1817 rev 1.5 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, 3.3V/3.0V µP Reset Notice: The information in this document is subject to change without notice 5 of 9 ASM1817 February 2005 rev 1.5 Package Dimension Plastic SOT-23 (3-Pin) D B E H e S A a A1 C e1 L Inches Millimeters Min 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 o 0 o 8 o 0 8 S NA o NA Low Power, 3.3V/3.0V µP Reset Notice: The information in this document is subject to change without notice 6 of 9 February 2005 ASM1817 rev 1.5 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, 3.3V/3.0V µP Reset Notice: The information in this document is subject to change without notice 7 of 9 February 2005 ASM1817 rev 1.5 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 ASM1817R-5 3.06 5 150 HIGH RPLL ASM1817R-10 2.88 10 150 HIGH RQLL ASM1817R-20 2.55 20 150 HIGH RRLL ASM1817R-5F 3.06 5 150 HIGH KPLL ASM1817R-10F 2.88 10 150 HIGH KQLL ASM1817R-20F 2.55 20 150 HIGH KRLL 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 ASM1817-5 3.06 5 150 HIGH ASM1817-5 ASM1817-10 2.88 10 150 HIGH ASM1817-10 ASM1817-20 2.55 20 150 HIGH ASM1817-20 ASM1817-5F 3.06 5 150 HIGH ASM1817-5F ASM1817-10F 2.88 10 150 HIGH ASM1817-10F ASM1817-20F 2.55 20 150 HIGH ASM1817-20F LEAD FREE DEVICES ** Add /T to Part Number for Tape and Reel (i.e ASM18xx-x/T) LL- Lot Code Low Power, 3.3V/3.0V µP Reset Notice: The information in this document is subject to change without notice 8 of 9 ASM1817 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: ASM1817 Document Version: 1.5 © Copyright 2003 Alliance Semiconductor Corporation. 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