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| October 2003 rev 1.0 ASM161 / ASM162 P Supervisory Circuit Key Features monitor power supplies in * * * * * * Edge triggered manual reset input single pulse output 49S minimum MR disable period after reset CMOS/TTL logic or switch interface Debounced input Low supply current extends battery life * 6A / 15A typ/max at 5.5V * 4.5A / 10A typ/max at 3.6V Long reset period * 0.8 sec minimum, 2 sec maximum Two reset polarity options * ASM161: Active LOW, open-drain * ASM162: Active HIGH Pinout matches the AS811/812 Small 4-Pin SOT-143 package Two temperature ranges: 00 to 700c and -400c to +850c General Description The ASM161 and ASM162 are cost effective, low power supervisory circuits that microprocessor, microcontroller and digital systems. If the power supply drops below the reset threshold level, a reset is asserted and remains asserted for atleast 800ms after VCC has risen above the reset threshold. An improved manual reset architecture gives the system designer additional flexibility. The debounced manual reset input is negative edge triggered. The reset pulse period generated by a MR transition is a minimum of 800 ms and a maximum of 2 sec duration. In addition, The MR input signal is blocked for an additional 49S minimum after the reset pulse ends. During the MR disable period, the microcontroller is guaranteed a time period free of additional manual reset signals. During this period DRAM contents can be refreshed or other critical system tasks undertaken. Low power consumption makes the ASM161/162 ideal for use in portable and battery operated equipments. With 3V supplies power consumption is 8W typically and 30W maximum. The ASM161 has an open-drain, active-LOW RESET output and requires an external pull-up resistor. The ASM162 has an active HIGH RESET output. The ASM161/162 are offered in compact 4-pin SOT-143 packages. No external components are required to trim threshold voltage for monitoring different supply voltages. With six different factory set, reset, threshold ranges from 2.63V to 4.63V, the ASM161/162 are suitable for monitoring 5V, 3.6V and 3.0V supplies. The ASM161/162 are available in temperature ranges 00 to 700c and -400c to +850c. Reset Threshold Part Suffix L M J T S R Voltage (V) 4.63 4.38 4.00 3.08 2.93 2.63 * * * * * Applications * * * * * * * PDAs Appliances Computers and embedded controllers Wireless communication systems Battery operated and intelligent instruments Automotive systems Safety systems Typical Operating Circuit VCC VCC ASM161 (ASM162) RESET (RESET) MR GND 20k for ASM161 only VCC RESET (RESET) P 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 October 2003 rev 1.0 ASM161 / ASM162 Block Diagram VCC 4 Voltage Divider + Bandgap Reference ASM161/162 Reset Circuit * Edge Trigger 2 RESET (ASM161) RESET (ASM162) VCC 4 ASM161 ~ RPU 2 3 MR MR Debounce Reset Circuit * Non-retriggerable, edge triggered manual reset 1 GND Pin Configuration SOT-143 GND 1 4 VCC GND 1 ~ ~ SOT-143 4 VCC ASM161 ASM162 RESET 2 3 MR RESET 2 3 MR RESET is open drain Pin Description Pin # Pin Name ASM161 1 ASM162 1 GND Ground. Active-LOW, open-drain reset output. RESET remains LOW while VCC is below the 2 RESET reset threshold and for 800ms minimum after VCC rises above the reset threshold. An external pull-up resistor is needed. 2 RESET Active HIGH reset output. RESET remains HIGH while VCC is below the reset threshold and for 800ms after VCC rises above the reset threshold. Manual reset input. A negative going edge transition on MR asserts reset. Reset remains asserted for one reset time-out period (800 ms min). This active-LOW input has an internal pull-up resistor. It can be driven from a TTL or CMOS logic line or shorted to ground with a switch. Leave open if unused. Power supply input voltage. Description 3 3 MR 4 4 VCC P Supervisory Circuit Notice: The information in this document is subject to change without notice 2 of 9 October 2003 rev 1.0 ASM161 / ASM162 The MR pin must be taken HIGH and LOW again after the tMRD period has been completed to initiate another reset pulse. The manual reset input has an internal 20k pull-up resistor. MR can be left open if not used. Detailed Descriptions The reset function ensures the microprocessor is properly reset and powers up into a known condition after a power failure. Reset Timing A reset is generated whenever the supply voltage is below the threshold level (VCC < VTH). The reset duration is at least 800ms after VCC has risen above the reset threshold and is guaranteed to be no more than 2 seconds. The rest signal remains active as long as the monitored supply voltage is below the internal threshold voltage. tMD *........ MR Triggering Pulse MR input is blocked Ready for next MR tMRD Reset Time-Out RESET *Second and following edges ignored The ASM161 has an open-drain, active LOW RESET output (which is guaranteed to be in the correct state for VCC down to 1.1 V). The ASM161 uses an external pull-up resistor. Output leakage current is under 1A. A high resistance value can be used to minimize current drain. The ASM162 generates an active-HIGH RESET output. Figure 1: Manual Reset Timing Application Information Glitch Resistance The ASM161/162 are relatively immune to short duration negative-going VCC transients/glitches. A VCC transient that goes 100mV below the reset threshold and lasts 20s or less will not typically cause a reset pulse. Part Number ASM161 ASM162 Manual Reset Reset Polarity LOW (use external pull-up resistor) HIGH Power Supply VCC 100K ASM162 MR RESET GND The ASM161/162 have a unique manual reset circuit. A negative going edge transition on MR initiates the reset. A manual reset generates a single reset pulse of fixed length. The output-reset pulse remains asserted for the Reset Active Time-Out Period tRP and then clears. Once the reset pulse is completed, the MR input remains disabled for at least 49S but not more than 122S. This period is specified as tMRD. During the MR disabled period, the microcontroller is guaranteed a time period free of new manual reset signals. This period can be used to refresh critical DRAM contents or other system tasks. Figure 2: RESET valid with VCC under 1.1V Valid Reset with VCC under 1.1V To ensure that logic inputs connected to the ASM162 RESET pin are in a known state when VCC is under 1.1V, a 100k pull-down resistor at RESET is needed. The value is not critical. This scheme does not work with the open-drain outputs of ASM161. P Supervisory Circuit Notice: The information in this document is subject to change without notice 3 of 9 October 2003 rev 1.0 ASM161 / ASM162 Absolute Maximum Ratings Parameter Pin Terminal Voltage with respect to Ground VCC RESET, RESET and MR Input Current at VCC and MR Rate of Rise at VCC Power Dissipation (TA = 70C) Operating Temperature Range Storage Temperature Range -40 -65 -0.3 -0.3 6.0 VCC + 0.3 20 100 320 85 160 V V mA V/s mW C C Min Max Unit Lead Temperature (soldering, 10 sec) 300 C Note: These are stress ratings only and functional operation is not implied. Exposure to absolute maximum ratings for prolonged time periods may affect device reliability. P Supervisory Circuit Notice: The information in this document is subject to change without notice 4 of 9 October 2003 rev 1.0 ASM161 / ASM162 Electrical Characteristics Unless otherwise noted, VCC is over the full range and TA = 00 to 700c for ASM161/162 X C and TA = -400c to +850c for ASM161/ 162 X E devices. Typical values at TA = 250c, VCC = 5V for L/M/J devices, VCC = 3.3V for T/S devices and VCC = 3V for R devices Parameter Input Voltage (VCC) Range Supply Current (Unloaded) Symbol VCC Conditions TA = 0C to 70C TA = 0C to 70C, ICC TA = -40C to +85C TA = 0C to 70C, TA = -40C to +85C L Devices VCC < 5.5V, L/M/J VCC < 3.6V, Min 1.1 6 4.5 4.56 4.50 4.31 4.25 3.93 3.89 3.04 3.00 2.89 2.85 2.59 2.55 30 VCC = VTH to (VTH -100mV) tRPW TA = 0C to 70C TA = -40C to 85C 800 560 10 100 tMD 0.5 20 1400 2000 ms 2240 S ns s 2.63 2.93 3.08 4.00 4.38 4.63 Typ Max 5.5 15 A 10 4.70 4.75 4.45 4.50 4.06 4.10 3.11 3.15 2.96 3.00 2.66 2.70 ppm/ C S V Unit V R/S/T TA = 25C Note 1 M devices TA = 25C Note 1 J devices Reset Threshold VTH TA = 25C Note 1 T devices TA = 25C Note 1 S devices TA = 25C Note 1 R devices TA = 25C Note 1 Reset Threshold Temp Coefficient VCC to reset delay Reset Pulse Width MR Minimum Pulse Width MR Glitch Immunity MR to RESET Propagation Delay TCVTH tMR P Supervisory Circuit Notice: The information in this document is subject to change without notice 5 of 9 October 2003 rev 1.0 Parameter Symbol VIH VIL MR Input Threshold VIH VIL MR Delay to MR Retrigger MR pull-up resistance VCC = VTH min., ISINK = 1.2mA, Low RESET output voltage (ASM161) ASM161 R/S/T VOL VCC = VTH min., ISINK = 3.2mA, ASM161 L/M/J VCC > 1.1, ISINK = 50A RESET Output Leakage Current (ASM161) Low RESET output voltage (ASM162) HIGH RESET Output Voltage (ASM162) ILKG VDRAIN < 6.0V, 0C < TA < 70C VCC = VTH min., ISINK = 1.2mA, VOL ASM162 R/S/T VCC = VTH min., ISINK = 3.2mA, ASM162 L/M/J VOH 1.8 ASM161 / ASM162 Typ Max Unit V 0.8 0.7VCC 0.25VCC 49 85 85 10 20 30 0.3 0.4 0.3 1 0.3 122 V V V tMRD TA = 0C to 70C TA = -40C to 85C S K V A V 0.4 V Notes: 1. Over operating temperature range. P Supervisory Circuit Notice: The information in this document is subject to change without notice 6 of 9 October 2003 rev 1.0 ASM161 / ASM162 Package Dimensions Plastic SOT - 143 (4Pin) B e1 Inches E Min H A B1 Millimeters Min Max Max Plastic SOT-143 (4-Pin) 0.031 0.001 0.014 0.030 0.0034 0.105 0.047 0.070 0.071 0.082 0.004 0.047 0.005 0.022 0.038 0.006 0.120 0.055 0.080 0.079 0.098 0.012 0.787 0.025 0.356 0.762 0.086 2.667 1.194 1.778 1.803 2.083 0.102 1.194 0.127 0.559 0.965 0.152 3.048 1.397 2.032 2.007 2.489 0.305 e D A1 B B1 A a = 0 -8 C D E e e1 H L C L A1 e Plastic SOT - 143 (4 pin) P Supervisory Circuit Notice: The information in this document is subject to change without notice 7 of 9 October 2003 rev 1.0 ASM161 / ASM162 Ordering Information Reset Threshold (V) 4.63 4.38 4.00 3.08 2.93 2.63 4.63 4.38 4.00 3.08 2.93 2.63 4.63 4.38 4.00 3.08 2.93 2.63 4.63 4.38 4.00 3.08 2.93 2.63 Temperature Range (C) 0 TO 70 0 TO 70 0 TO 70 0 TO 70 0 TO 70 0 TO 70 0 TO 70 0 TO 70 0 TO 70 0 TO 70 0 TO 70 0 TO 70 -40 TO 85 -40 TO 85 -40 TO 85 -40 TO 85 -40 TO 85 -40 TO 85 -40 TO 85 -40 TO 85 -40 TO 85 -40 TO 85 -40 TO 85 -40 TO 85 Package Marking (XX Lot Code) TAXX TBXX TCXX TDXX TEXX TFXX TGXX THXX TIXX TJXX TKXX TLXX TMXX TNXX TOXX TPXX TQXX TRXX TSXX TTXX TUXX TVXX TWXX TXXX Part Number1 ASM161LCUS/T ASM161MCUS/T ASM161JCUS/T ASM161TCUS/T ASM161SCUS/T ASM161RCUS/T ASM162LCUS/T ASM162MCUS/T ASM162JCUS/T ASM162TCUS/T ASM162SCUS/T ASM162RCUS/T ASM161LEUS/T ASM161MEUS/T ASM161JEUS/T ASM161TEUS/T ASM161SEUS/T ASM161REUS/T ASM162LEUS/T ASM162MEUS/T ASM162JEUS/T ASM162TEUS/T ASM162SEUS/T ASM162REUS/T Pin-Package 4-SOT-143 4-SOT-143 4-SOT-143 4-SOT-143 4-SOT-143 4-SOT-143 4-SOT-143 4-SOT-143 4-SOT-143 4-SOT-143 4-SOT-143 4-SOT-143 4-SOT-143 4-SOT-143 4-SOT-143 4-SOT-143 4-SOT-143 4-SOT-143 4-SOT-143 4-SOT-143 4-SOT-143 4-SOT-143 4-SOT-143 4-SOT-143 Notes: 1. Tape and Reel packaging is indicated by the /T designation. P Supervisory Circuit Notice: The information in this document is subject to change without notice 8 of 9 ASM161 / ASM162 Alliance Semiconductor Corporation 2575, Augustine Drive, Santa Clara, CA 95054 Tel: 408 - 855 - 4900 Fax: 408 - 855 - 4999 www.alsc.com Copyright (c) Alliance Semiconductor All Rights Reserved Part Number: ASM161 / ASM162 Document Version: 1.0 (c) Copyright 2003 Alliance Semiconductor Corporation. All rights reserved. Our three-point logo, our name and Intelliwatt are trademarks or registered trademarks of Alliance. All other brand and product names may be the trademarks of their respective companies. Alliance 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 estimates 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 changes to these specifications are possible. The information in this product data sheet is intended to be general descriptive information for potential customers and users, and is not intended to operate as, or provide, any guarantee or warrantee to any user or customer. Alliance does not assume 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 products including liability or warranties related to fitness for a particular purpose, merchantability, or infringement of any intellectual property rights, except as express agreed to in Alliance's Terms and Conditions of Sale (which are available 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 rights of Alliance or third parties. Alliance does not authorize its products for use as critical components in life-supporting 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. |
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