ASM1816 February 2005 rev 1.4 Low Power 3.3V/3.0V µP Reset, Active LOW, Open-Drain Output General Description Applications The ASM1816 is a voltage supervisory device with low-power, • Set-top boxes 3.3V/3V µP Reset, active LOW, open-drain output. Maximum • Cellular phones supply current over temperature is a low 15µA (at 3.6V). • PDAs • Energy management systems The ASM1816 generates an active LOW 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%. When an out-of- • Single board computers tolerance condition is detected, an internal power-fail signal is Typical Application generated which forces an active LOW reset signal. After VCC returns to an in-tolerance condition, the reset signal remains VCC active for 150ms to allow the power supply and system microprocessor to stabilize. ASM1816 The ASM1816 is designed with a open-drain 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. RESET GND Other low power products in this family include the ASM1810/ 11/12/15/17, ASM1233D and ASM1233M. Key Features • Block Diagram Low Supply Current VCC 2 •20 µA maximum (5.5 V) •15µA maximum (3.6 V) • Automatically restarts a microprocessor after power failure • 150ms reset delay after VCC returns to an in-tolerance con- ASM1816 Supply Tolerance Bias 1 dition + • Active LOW power-up reset - • Precision temperature-compensated voltage reference and comparator • Eliminates external components • TO-92 and compact surface mount SOT-23 package • Operating temperature -40°C to +85°C 5.0KΩ Delay 150ms Typical Reference 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 RESET ASM1816 February 2005 rev 1.4 Pin Configuration TO-92 SOT-23 RESET ASM1816 1 ASM1816-R VCC 3 GND 2 1 2 3 Pin Description TO-92 SOT-23 Pin # Pin # 1 Pin Name Description 1 RESET Active LOW 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 ASM1816 February 2005 rev 1.4 VCCTP (MAX) Operation - Power Monitor The ASM1816 detects tF VCC Application Information out-of-tolerance power VCCTP supply VCCTP (MIN) conditions. It resets a processor during power-up, powermonitored power supply voltage is below the reset threshold. When an out-of-tolerance VCC voltage is detected, the RESET RESET signal is asserted. On power-up, RESET is kept tRPD ~ ~ down and issues a reset to the system processor when the active (LOW) 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 tR Figure 2: Timing Diagram: Power-Down VCCTP (MAX) VCCTP (MIN) ~ VCC VCCTP tRPU VOH ~ RESET Figure 1: Timing Diagram: Power-Up Low Power 3.3V/3.0V µP Reset Notice: The information in this document is subject to change without notice 3 of 9 ASM1816 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 = 1.2V 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 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 +10 mA VCC Trip Point (ASM1816R-5) VCCTP 2.98 3.06 3.15 V VCC Trip Point (ASM1816R-10) VCCTP 2.80 2.88 2.97 V VCC Trip Point (ASM1816R-20) VCCTP 2.47 2.55 2.64 V RP 3.5 5.5 7.5 kΩ 10 pF 5 µs Internal Pull-up Resistor Output Capacitance COUT VCC Detect to RESET Low tRPD 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 ASM1816 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 3.3V/3.0V µP Reset Notice: The information in this document is subject to change without notice 5 of 9 ASM1816 February 2005 rev 1.4 Package Dimension Plastic SOT-23 (3-Pin) D B E H e S A a C e1 A1 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 ASM1816 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 3.3V/3.0V µP Reset Notice: The information in this document is subject to change without notice 7 of 9 ASM1816 February 2005 rev 1.4 Ordering Information Device Summary Part *** Number RESET Output Voltage (V) RESET Tolerance (%) RESET Time (ms) Open-Drain ** Output Stage SOT-23 Package RESET Polarity Package Marking TIN - LEAD DEVICES ASM1816R-5 3.06 5 150 LOW RMLL ASM1816R-10 2.88 10 150 LOW RNLL ASM1816R-20 2.55 20 150 LOW ROLL LEAD FREE DEVICES ASM1816R-5F 3.06 5 150 LOW KMLL ASM1816R-10F 2.88 10 150 LOW KNLL ASM1816R-20F 2.55 20 150 LOW KOLL Part *** Number RESET Output Voltage (V) RESET Tolerance (%) RESET Time (ms) Open-Drain ** Output Stage TO-92 Package RESET Polarity Package Marking TIN - LEAD DEVICES ASM1816-5 3.06 5 150 LOW ASM1816-5 ASM1816-10 2.88 10 150 LOW ASM1816-10 ASM1816-20 2.55 20 150 LOW ASM1816-20 LEAD FREE DEVICES ASM1816-5F 3.06 5 150 LOW ASM1816-5F ASM1816-10F 2.88 10 150 LOW ASM1816-10F ASM1816-20F 2.55 20 150 LOW ASM1816-20F ** Internal 5.5kΩ resistor pull-up ** *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 ASM1816 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: ASM1816 Document Version: 1.4 © Copyright 2003 Alliance Semiconductor Corporation. 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