ASM1232LPSN

ASM1232LP ALSC | Alldatasheet

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Technical content

Notice: The information in this document is subject to change without notice January 2005 rev 1.5 5V µP Power Supply Monitor and Reset Circuit General Description The ASM1232LP/LPS is a fully integrated microprocessor supervisor. It can halt and restart a “hung-up” microprocessor, restart a microprocessor after a power failure. It has a watchdog timer and external reset override. A precision temperature- compensated reference and comparator circuits monitor the 5V, V CC input voltage status. During power-up or when the V CC power supply falls outside selectable tolerance limit s, both RESET and RESET become active. When VCC rises above the threshold voltage, the reset signals remain active for an additional 250ms minimum, allowing the power supply and system microprocessor to stabilize. The trip point tolerance signal, TOL, selects the trip level tolerance to be either 5% or 10%. Each device has both a push-pull, active HIGH reset output and an open drain active LOW reset output. A debounced manual reset input, PBRST , activates the reset outputs for a minimum period of 250ms. There is a watchdog timer to stop and restart a microprocessor that is “hung-up”. The watc hdog timeouts periods are selectable: 150ms, 610ms and 1200ms. If the ST input is not strobed LOW before the time-out period expires, a reset is generated. Devices are available in 8-pin DIP, 16-pin SO and compact 8- pin MicroSO packages. Key Features

• 5V supply monitor
• Selectable watchdog period
• Debounce manual push-button reset input
• Precision temperature-compensated voltage reference and comparator.
• Power-up, power-down and brown out detection
• 250ms minimum reset time
• Active LOW open drain reset output and active HIGH push-pull output
• Selectable trip point tolerance: 5% or 10%
• Low-cost surface mount packa ges: 8-pin/16-pin SO, 8-pin DIP and 8-pin Micro SO packages
• Wide operating temperature -40°C to +85°C (N suffixed devices)

Applications

• Microprocessor Systems
• Computers
• Controllers
• Portable Equipment
• Intelligent Instuments
• Automotive Systems Typical Operating Circuit Block Diagram ASM1232LP/LPS ST RESET GND TD TOL I/O RESET µP10kΩ +5V Tolerance Selection Reference Push Button Voltage Sense Watchdog Transition Reset & Debounce Comparators Detector Watchdog Timer - RESET RESET PBRST ST TD TOL VCC GND 40kΩ VCC ASM1232LP/LPS

Notice: The information in this document is subject to change without notice 5V µP Power Supply Monitor and Reset Circuit January 2005 rev 1.5 Pin Configuration Pin Description Pin # 8-Pin Package Pin # 16-Pin Package Pin Name Function 1 2 PBRST Debounced manual pushbutton RESET input.

24 T D

Watchdog time delay selection. (tTD = 150ms for TD = GND, tTD = 610ms for TD=Open, and tTD = 1200ms for TD = VCC).

36 T O L Selects 5% (TOL connected to GND) or 10% (TOL connected to VCC)

trip point tolerance. 4 8 GND Ground. 5 9 RESET Active HIGH reset output. RESET is active: 1. If VCC falls below the reset voltage trip point. 2. If PBRST is LOW. 3. If ST is not strobed LOW before the timeout period set by TD expires. 4. During power-up. 6 11 RESET Active LOW reset output. (See RESET). 71 3 S T Strobe input. 81 5 VCC 5V power. - 1,3,5,7, 10,12,14,16 NC No internal connection. 4 5 8PBRST TD TOL GND VCC ST RESET RESET PBRST TD TOL GND VCC ST RESET RESET ASM1232LPS 16NC NC NC NC NC NC NC NC ASM1232LPU DIP/SO/MicroSO SO ASM1232LP ASM1232LPS-2

Notice: The information in this document is subject to change without notice 5V µP Power Supply Monitor and Reset Circuit January 2005 rev 1.5 Absolute Maximum Ratings Unless otherwise stated, 4.5V <= V CC<= 5.5V and over the operating temperature range of 0°C to 70°C (-40°C to +85°C. for N devices). All voltages are referenced to ground. Parameter Min Max Unit Voltage on VCC -0.5 7 V Voltage on ST, TD -0.5 VCC + 0.5 V Voltage on PBRST, RESET, RESET -0.5 VCC + 0.5 V Operating Temperature Range (N suffixed devices) -40 +85 °C Operating Temperature Range (others) 0 70 °C Soldering Temperature (for 10 sec) +260 °C Storage Temperature -55 +125 °C ESD rating HBM MM 200 KV V Note: 1. Voltages are measured with respect to ground 2. These are stress ratings only and functional implication is not implied. Exposure to absolute maximum ratings for extended periods may affect device reliability. Parameter Symbol Conditions Min Typ Max Unit Supply Voltage VCC 4.5 5.5 V ST and PBRST Input High Level VIH 2 VCC + 0.3 V ST and PBRST Input Low Level VIL -0.3 0.8 V VCC Trip Point (TOL = GND) V CCTP 4.50 4.62 4.74 V VCC Trip Point (TOL = VCC)V CCTP 4.25 4.37 4.49 V Watchdog Timeout Period tTD TD = GND 62.5 150 250 ms Watchdog Timeout Period tTD TD = VCC 500 1200 2000 ms Watchdog Timeout Period tTD TD Floating 250 610 1000 ms Output Voltage VOH I=-500µA, Note 3 VCC - 0.5 V CC - 0.1 V Output Current IOH Output = 2.4V, Note 2 -8 -10 mA Output Current IOL Output = 0.4V 10 mA

Notice: The information in this document is subject to change without notice 5V µP Power Supply Monitor and Reset Circuit January 2005 rev 1.5 Notes 1. PBRST is internally pulled HIGH to VCC through a nominal 40kΩ resistor. 2. RESET is an open drain output. 3. RESET remains within 0.5V of V CC on power-down until V CC falls below 2V. RESET remains within 0.5V of ground on power-down until V CC falls below 2.0V. 4. Must not exceed the minimum watchdog time-out period (t TD). The watchdogcircuit cannot be disabled. To avoid a reset, ST must be strobed. Input Leakage IIL Note 1 -1.0 1.0 µA RESET Low Level VOL Note 3 0.4 V Internal Pull-up Resistor Note 1 40 k Ω Operating Current (CMOS) ICC1 30 µA Input Capacitance CIN 5p F Output Capacitance COUT 10 pF PBRST Manual Reset Minimum Low Time tPB PBRST = VIL 20 ms Reset Active Time tRST 250 610 1000 ms ST Pulse Width tST Note 4 20 ns VCC Fail Detect to RESET or RESET tRPD 58 µ s VCC Slew Rate t F 4.75V to 4.25V 300 µs PBRST Stable LOW to RESET and RESET Active tPDLY 20 ms VCC Detect to RESET or RESET inactive tRPU tRISE = 5µs 250 610 1000 ms VCC Slew Rate t R 4.25V to 4.75V 0 ns Parameter Symbol Conditions Min Typ Max Unit

Notice: The information in this document is subject to change without notice 5V µP Power Supply Monitor and Reset Circuit ASM1232LP/LPSJanuary 2005 rev 1.5

Package Information

MicroSO (8-Pin) SO (8-Pin) Plastic DIP (8-Pin) Inches Millimeteres Min Max Min Max MicroSO (8-Pin) A 0.032 0.044 0.81 1.10 A1 0.002 0.006 0.05 0.15 A2 0.030 0.038 0.76 0.97 b 0.012 BSC 0.30 BSC C 0.004 0.008 0.10 0.20 D 0.114 0.122 2.90 3.10 e 0.0256 BSC 0.65 BSC E 0.184 0.200 4.67 5.08 E1 0.114 0.122 2.90 3.10 L 0.016 0.026 0.41 0.66 S 0.0206 BSC 0.52 BSC a 0 °6 °0 °6 ° SO (8-Pin) A 0.053 0.069 1.35 1.75 A1 0.004 0.010 0.10 0.25 A2 0.049 0.059 1.25 1.50 B 0.012 0.020 0.31 0.51 C 0.007 0.010 0.18 0.25 D 0.193 BSC 4.90 BSC E 0.154 BSC 3.91 BSC e 0.050 BSC 1.27 BSC H 0.236 BSC 6.00 BSC L 0.016 0.050 0.41 1.27 θ 0° 8° 0° 8° Plastic DIP (8-Pin) A - 0.210 - 5.33 A1 0.015 - 0.38 - A2 0.115 0.195 2.92 4.95 b 0.014 0.022 0.36 0.56 b2 0.045 0.070 1.14 1.78 C 0.008 0.014 0.20 0.36 D 0.355 0.400 9.02 10.16 E 0.300 0.325 7.62 8.26 E1 0.240 0.280 6.10 7.11 e 0.100 BSC 2.54 BSC eB - 0.430 - 10.92 L 0.115 0.150 2.92 3.81 D E H D A2 A θ L C B e

Notice: The information in this document is subject to change without notice 5V µP Power Supply Monitor and Reset Circuit January 2005 rev 1.5 SO (16-Pin) * JEDEC Drawing MS-013AA SO (16-Pin)* Inches Millimeter Min Max Min Max A 0.053 0.069 1.35 1.75 A1 0.004 0.010 0.10 0.25 A2 0.049 0.059 1.25 1.50 B 0.013 0.022 0.33 0.53 C 0.008 0.012 0.19 0.27 D 0.386 0.394 9.80 10.01 E 0.150 0.157 3.80 4.00 e 0.050 BSC 1.27 BSC H 0.228 0.244 5.80 6.20 h 0.010 0.016 0.25 0.41 L 0.016 0.035 0.40 0.89 θ 0° 8° 0° 8° E H A D e B θ L C h Seating Plane D0.004 PI N 1 ID18 91 6

Notice: The information in this document is subject to change without notice 5V µP Power Supply Monitor and Reset Circuit January 2005 rev 1.5

Ordering Information

Current (µA) Voltage Monitoring Application Package Marking TIN-LEAD DEVICES ASM1232LP 8L PDIP 0°C to +70°C 30 5V ASM1232LP ASM1232LPN 8L PDIP -40° C to +85°C 30 5V ASM1232LPN ASM1232LPS 16L SOIC 0°C to +70°C 30 5V ASM1232LPS ASM1232LPS-2 8L SOIC 0°C to +70° C 30 5V ASM1232LPS-2 ASM1232LPSN 16L SOIC -40°C to +85°C 30 5V ASM1232LPSN ASM1232LPSN-2 8L SOIC -40°C to +85°C 30 5V ASM1232LPSN-2 ASM1232LPU 8L MSOP 0°C to +70°C 30 5V ASM1232LP ASM1232LPUN 8L MSOP -40°C to +85°C 30 5V ASM1232LPN LEAD FREE DEVICES ASM1232LPF 8L PDIP 0°C to +70°C 30 5V ASM1232LPF ASM1232LPNF 8L PDIP -40°C to +85°C 30 5V ASM1232LPNF ASM1232LPS-2F 8L SOIC 0°C to +70°C 30 5V ASM1232LPS-2F ASM1232LPSF 16L SOIC 0°C to +70°C 30 5V ASM1232LPSF ASM1232LPSN-2F 8L SOIC -40°C to +85°C 30 5V ASM1232LPSN-2F ASM1232LPSNF 16L SOIC -40°C to +85°C 30 5V ASM1232LPSNF ASM1232LPUF 8L MSOP 0°C to +70°C 30 5V ASM1232LPF ASM1232LPUNF 8L MSOP -40°C to +85°C 30 5V ASM1232LPNF

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: ASM1232LP/LPS Document Version: 1.5 © Copyright 2003 Alliance Semiconductor Cor poration. All rights reserved. Our three- point logo, our name and Intelliwatt are tr ademarks or registered trademarks of Alliance. All other brand and product names may be the trademarks of their respective companies. Allia nce reserves the right to make changes to this document and its products at any time without notice. Alliance assumes no responsibility for any errors that may appear in this document. The data contained herein represents Alliance's best data and/or estima tes at the time of issuance. Alliance reserves the right to change or correct this data at any time, without notice. If the product described herein is under development, significant chan ges to these specifications are possible. The informati on in this product data sheet is intended to be general descriptive information for p otential customers and users, and is not intended to operate as, or provide, any guarantee or warrantee to any user or customer. Alliance does not ass ume any responsibility or liability arising out of the application or use of any product described herein, and disclaims any express or implied warranties related to the sale and/or use of Alliance product s including liability or warranties related to fitness for a particular purpose, merc hantability, or infringement of any intellectual property rights, except as express agreed to in Alliance's Terms and Conditions of Sale (which are availabl e from Alliance). All sales of Alliance products are made exclusively according to Alliance's Terms and Conditions of Sale. The purchase of products from Alliance does not convey a license under any patent rights , copyrights; mask works rights, trademarks , or any other intellectual property rig hts of Alliance or third parties. Alliance does not authorize its products for use as critical components in life-suppor ting systems where a malfunction or failure may reasonably be expected to result in significant injury to the user, and the inclusion of Alliance products in such life-supporting systems implies that the manufacturer assumes all risk of such use and agrees to indemnify Alliance against all claims arising from such use. ASM1232LP/LPS