ASM8500 November 2003 rev 1.0 Low Power 5V / 3.3V µP Reset Active LOW, Open - Drain Output General Description The ASM8500 is a voltage supervisory device with a low-power, 5V/3.3V µP Reset, active LOW, open-drain output. Maximum supply current over temperature is a low 6µA. • Printers • Single board computers Typical Operating Circuit The ASM8500 generates an active LOW reset signal whenever VCC the monitored supply is out of tolerance. A precision reference and comparator circuit monitor power supply (VCC) level. Reset ASM8500 threshold tolerance level is ±1.5%. When an out-of-tolerance condition is detected, an internal power-fail signal is generated Microprocessor which forces an active LOW reset signal. After VCC returns to an in-tolerance condition, the reset signal remains active for RESET RESET 1.5ms to allow the power supply and system microprocessor to stabilize. GND The ASM8500 is designed with a open-drain output stage and operates over the extended industrial temperature range. Devices are available in compact surface mount SOT-89 Block Diagram packages. Other low power products in this family include the ASM1810/ VCC 11/12/15/16/17, ASM1233D and ASM1233M. ASM8500 Supply Tolerance Bias Key Features 5ΚΩ RESET • Low Supply Current + • 6 µA maximum (5.5 V) • Automatically restarts a microprocessor after power failure - • 1.5ms reset delay after VCC returns to an in-tolerance con- • Active LOW power-up reset • Precision temperature-compensated voltage reference and Delay 1.5ms Typical Reference dition comparator • Eliminates external components • Compact surface mount SOT-89 package • Operating temperature -40°C to +85°C GND Applications • Set-top boxes • Cellular phones • PDAs • Energy management systems • Embedded control systems 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 ASM8500 November 2003 rev 1.0 Pin Configuration 1 VCC 2 GND 3 RESET Pin Description Pin # Pin Name Description 1 VCC Power supply input 2 GND Ground 3 RESET Active LOW reset output Low Power 5V / 3.3V µP Reset Active LOW, Open - Drain Output Notice: The information in this document is subject to change without notice 2 of 7 ASM8500 November 2003 rev 1.0 Application Information Operation - Power Monitor The ASM8500 detects out-of-tolerance power supply conditions. It resets a processor during power-up, power- tF VCC VCCTP (MAX) down and issues a reset to the system processor when the VCCTP monitored power supply voltage is below the reset threshold. VCCTP (MIN) When an out-of-tolerance VCC voltage is detected, the voltage has reached the selected tolerance. This allows the RESET tRPD ~ ~ RESET signal is asserted. On power-up, RESET is kept active (LOW) for approximately 1.5ms after the power supply power supply and microprocessor to stabilize before RESET is released. VOL tR VCCTP (MAX) VCCTP (MIN) ~ VCC Figure 2: Timing Diagram: Power-Down VCCTP tRPU VOH ~ RESET Figure 1: Timing Diagram: Power-Up Low Power 5V / 3.3V µP Reset Active LOW, Open - Drain Output Notice: The information in this document is subject to change without notice 3 of 7 ASM8500 November 2003 rev 1.0 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 Soldering Temperature (for 10 sec) Storage Temperature -55 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 Supply Voltage VCC Output Voltage VOH IOUT < 500 µA Output Current IOH Output = 0.4V, VCC > 2.7V Operating Current ICC Min Typ 1 VCC - 0.5V Max Unit 5.5 V VCC - 0.1V V +10 VCC < 5.5V, RESET output open mA 6 µA VCC Trip Point (ASM8500-42) VCCTP 4.2 V VCC Trip Point (ASM8500-29) VCCTP 2.9 V VCC Trip Point (ASM8500-27) VCCTP 2.7 V RP Internal Pull-up Resistor Output Capacitance COUT RESET Active Time tRESET VCC Detect to RESET Low 0.5 tRPD VCC Slew Rate (VCCTP (MAX) to VCCTP (MIN) VCC Slew Rate (VCCTP (MIN) to VCCTP (MAX) VCC Detect to RESET High 3.5 5.5 7.5 kΩ 10 pF 1.5 5 ms 2 5 µs tF 300 µs tR 0 ns tRPU tr = 5µs 0.5 1.5 5 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 / 3.3V µP Reset Active LOW, Open - Drain Output Notice: The information in this document is subject to change without notice 4 of 7 ASM8500 November 2003 rev 1.0 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 ASM8500 4.2, 2.9, 2.7 1.5 Open-Drain LOW Low Power 5V / 3.3V µP Reset Active LOW, Open - Drain Output Notice: The information in this document is subject to change without notice 5 of 7 ASM8500 November 2003 rev 1.0 Package Dimensions Plastic SOT-89 D D1 H Polish E HE A1 S1 e b b1 C Matte Finish b Polish Dimension in Millimeters Dimensions in Inches Symbol Min Max Min Max A 1.40 1.60 0.0551 0.0630 A1 0.89 - 0.0350 - b 0.36 0.52 0.0142 0.0205 b1 0.41 0.56 0.0161 0.0220 C 0.35 0.44 0.0138 0.0173 D 4.40 4.60 0.1732 0.1811 D1 1.35 1.83 0.0531 0.0720 HE - 4.25 - 0.1673 E 2.29 2.60 0.0902 0.1024 e 2.90 3.10 0.1142 0.1220 H 0.35 0.70 0.0138 0.0276 S1 1.40 1.60 0.0551 0.0630 Low Power 5V / 3.3V µP Reset Active LOW, Open - Drain Output Notice: The information in this document is subject to change without notice 6 of 7 ASM8500 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 Preliminary Information Part Number: ASM8500 Document Version: 1.0 © Copyright 2003 Alliance Semiconductor Corporation. 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