ASM1811

February 2005 rev 1.4 ASM1811 Low Power 5V µP Reset Active LOW, Open - Drain Output Applications • • • • • • • Set-top boxes Cellular phones PDAs Energy management systems Embedded control systems Printers Single board computers General Description The ASM1811 is a voltage supervisory device with a low-power, 5V µP Reset, active LOW, open-drain output. Maximum supply current over temperature is a low 20µA. The ASM1811 generates an active LOW 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 LOW 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. Typical Operating Circuit VCC ASM1811 The ASM1811 is designed with a open-drain output stage and operates over the extended industrial temperature range. Devices are available in low cost TO-92 and compact surface mount SOT-23 packages. Other low power products in this family include the ASM1810/ 12/15/16/17, ASM1233D and ASM1233M. RESET Microprocessor 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 LOW power-up reset Precision temperature-compensated voltage reference and comparator Eliminates external components Low cost TO-92 and compact surface mount SOT-23 packages Operating temperature -40°C to +85°C Block Diagram VCC 2 Supply Tolerance Bias ASM1811 5.5KΩ 1 RESET + Reference Delay 150ms Typical 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 ASM1811 Pin Configuration TO-92 SOT-23 ASM1811 RESET 1 ASM1811-R 3 GND VCC 2 1 2 3 Pin Description SOT-23 Pin # 1 2 3 TO-92 Pin Name Pin # 1 2 3 RESET VCC GND Active LOW 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 ASM1811 Application Information Operation - Power Monitor The ASM1811 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 voltage has reached the selected tolerance. This allows the power supply and microprocessor to stabilize before RESET is released. RESET VCC VCCTP (MAX) VCCTP VCCTP (MIN) tF tRPD tR VCCTP (MAX) VCCTP (MIN) VCCTP VOL Figure 2: Timing Diagram: Power-Down VCC tRPU VOH RESET Figure 1: Timing Diagram: Power-Up ~ ~ 3 of 9 active (LOW) for approximately 150ms after the power supply ~ ~ ~ ~ Low Power 5V µP Reset Notice: The information in this document is subject to change without notice February 2005 rev 1.4 ASM1811 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 to ground Parameter Supply Voltage Operating Current VCC Trip Point (ASM1811R-5) VCC Trip Point (ASM1811R-10) VCC Trip Point (ASM1811R-15) Internal Pull-up Resistor Output Capacitance RESET Active Time VCC Detect to RESET Low VCC Slew Rate (VCCTP (MAX) to VCCTP (MIN) VCC Slew Rate (VCCTP (MIN) to VCCTP (MAX) VCC Detect to RESET High Symbol VCC ICC VCCTP VCCTP VCCTP RP COUT tRESET tRPD tF tR tRPU tr = 5µs Conditions Min 1.2 Typ Max 5.5 Unit V µA V V V kΩ pF ms µs µs VCC < 5.5V, RESET output open 4.50 4.25 4.00 3.5 8 4.62 4.35 4.13 5.5 20 4.75 4.49 4.24 7.5 10 100 150 2 250 5 300 0 100 150 300 ns ms Note: The tF value is for reference in defining values for tRPD and should not be considered for proper operation or use. 4 of 9 Low Power 5V µP Reset Notice: The information in this document is subject to change without notice February 2005 rev 1.4 ASM1811 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 ASM1811 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 1.17 0.15 0.50 0.20 3.04 1.40 0.037 BSC 0.075 BSC 0.083 0.016 0.104 0.024 0.95 BSC 1.9 BSC 2.10 0.40 2.64 0.60 0 o 8 NA o 0 o 8 NA o 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) ASM1811 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 ASM1811 Ordering Information Device Summary RESET Output Voltage (V) RESET Tolerance (%) RESET Time (ms) Part *** Number Open-Drain ** Output Stage SOT-23 Package RESET Polarity Package Marking TIN - LEAD DEVICES ASM1811R-5 ASM1811R-10 ASM1811R-15 LEAD FREE DEVICES ASM1811R-5F ASM1811R-10F ASM1811R-15F 4.62 4.35 4.13 RESET Output Voltage (V) 5 10 15 RESET Tolerance (%) 150 150 150 RESET Time (ms) LOW LOW LOW KDLL KELL KFLL 4.62 4.35 4.13 5 10 15 150 150 150 LOW LOW LOW RDLL RELL RFLL Part *** Number Open-Drain ** Output Stage TO-92 Package RESET Polarity Package Marking TIN - LEAD DEVICES ASM1811-5 ASM1811-10 ASM1811-15 LEAD FREE DEVICES ASM1811-5F ASM1811-10F ASM1811-15F 4.62 4.35 4.13 5 10 15 150 150 150 LOW LOW LOW ASM1811-5F ASM1811-10F ASM1811-15F 4.62 4.35 4.13 5 10 15 150 150 150 LOW LOW LOW ASM1811-5 ASM1811-10 ASM1811-15 ** 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 5V µP Reset Notice: The information in this document is subject to change without notice 8 of 9 ASM1811 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: ASM1811 Document Version: 1.4 © Copyright 2003 Alliance Semiconductor Corporation. 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