ASM161/ASM162 April 2008 rev 1.5 µP Supervisory Circuit General Description Reset Threshold The ASM161 and ASM162 are cost effective, low power Part Suffix Voltage (V) L 4.63 M 4.38 reset is asserted and remains asserted for atleast 800ms J 4.00 after VCC has risen above the reset threshold. An T 3.08 S 2.93 R 2.63 supervisory circuits that monitor power supplies in microprocessor, microcontroller and digital systems. If the power supply drops below the reset threshold level, a 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 Key Features transition is a minimum of 800 ms and a maximum of • Edge triggered manual reset input 2 sec duration. In addition, The MR input signal is • single pulse output blocked for an additional 49µS minimum after the reset • 49µS minimum MR disable period after reset pulse • CMOS/TTL logic or switch interface ends. During the MR disable period, the microcontroller is guaranteed a time period free of • Debounced input additional manual reset signals. During this period DRAM • Low supply current extends battery life contents can be refreshed or other critical system tasks 6µA / 15µA typ/max at 5.5V undertaken. 4.5µA / 10µA typ/max at 3.6V Low power consumption makes the ASM161/162 ideal for use in portable and battery • Long reset period operated • 0.8 sec minimum, 2 sec maximum equipments. With 3V supplies power consumption is 8µW typically and 30µW 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. • Two reset polarity options ASM161: Active LOW, open-drain ASM162: Active HIGH • Pinout matches the ASM811/812 • Small 4-Pin SOT-143 package The ASM161/162 are offered in compact 4-pin SOT-143 • Two temperature ranges: 0°c to 70°c and -40°c to +85°c packages. No external components are required to trim threshold voltage for monitoring different supply voltages. Applications With six different factory set, reset, threshold ranges from • PDAs 2.63V to 4.63V, the ASM161/162 are suitable for • Appliances monitoring 5V, 3.6V and 3.0V supplies. The ASM161/162 • Computers and embedded controllers are available in temperature ranges 0°c to 70°c and -40°c • Wireless communication systems to +85°c. • Battery operated and intelligent instruments • Automotive systems • Safety systems PulseCore Semiconductor Corporation 1715 S. Bascom Ave Suite 200 Campbell, CA 95008 • Tel: 408-879-9077 • Fax: 408-879-9018 www.pulsecoresemi.com Notice: The information in this document is subject to change without notice. ASM161/ASM162 April 2008 rev 1.5 Typical Operating Circuit Block Diagram Pin Configuration RESET is open drain µP Supervisory Circuit Notice: The information in this document is subject to change without notice. 2 of 9 ASM161/ASM162 April 2008 rev 1.5 Pin Description Pin # Pin ASM161 ASM162 1 1 2 - Function Name GND RESET Ground. Active-LOW, open-drain reset output. RESET remains LOW while VCC is below the 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 3 3 MR 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. 4 4 VCC Power supply input voltage. Detailed Description Manual Reset The reset function ensures the microprocessor is properly The ASM161/162 have a unique manual reset circuit. A reset and powers up into a known condition after a power negative going edge transition on MR initiates the reset. failure. A manual reset generates a single reset pulse of fixed length. The output-reset pulse remains asserted for the 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 Reset Active Time-Out Period tRP and then clears. Once the reset pulse is completed, the MR input remains disabled for at least 49µS but not more than 122µS. This period is specified as tMRD. 2 seconds. The rest signal remains active as long as the monitored supply voltage is below the internal threshold During the MR disabled period, the microcontroller is guaranteed a time period free of new manual reset voltage. signals. This period can be used to refresh critical DRAM The ASM161 has an open-drain, active LOW RESET contents or other system tasks. output (which is guaranteed to be in the correct state for VCC down to 1.1 V). The ASM161 uses an external pullup resistor. Output leakage current is under 1µA. A high resistance value can be used to minimize current drain. The ASM162 generates an active-HIGH RESET output. 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 20kΩ pull-up resistor. MR can be left open if not used. Part Number ASM161 ASM162 Reset Polarity LOW (use external pull-up resistor) HIGH µP Supervisory Circuit Notice: The information in this document is subject to change without notice. 3 of 9 ASM161/ASM162 April 2008 rev 1.5 Application Information Valid Reset with VCC under 1.1V Glitch Resistance To ensure that logic inputs connected to the ASM162 The ASM161/162 are relatively immune to short duration negative-going VCC transients/glitches. A VCC transient RESET pin are in a known state when VCC is under 1.1V, a 100kΩ pull-down resistor at RESET is needed. The that goes 100mV below the reset threshold and lasts 20s value is not critical. or less will not typically cause a reset pulse. This scheme does not work with the open-drain outputs of ASM161. Absolute Maximum Ratings Parameter Min Max Unit -0.3 6.0 V -0.3 VCC + 0.3 V 20 mA Rate of Rise at VCC 100 V/µs Power Dissipation (TA = 70°C) 320 mW Pin Terminal Voltage with Respect to Ground VCC RESET, RESET and MR Input Current at VCC and MR Operating Temperature Range -40 85 °C Storage Temperature Range -65 160 °C 300 °C 2 200 KV V Lead Temperature (soldering, 10 sec) ESD rating HBM MM 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. µP Supervisory Circuit Notice: The information in this document is subject to change without notice. 4 of 9 ASM161/ASM162 April 2008 rev 1.5 Electrical Characteristics Unless otherwise noted, VCC is over the full range and TA = 0°c to 70°c for ASM161/162 X C and TA = -40°c to +85°c for ASM161/162 X E devices. Typical values at TA = 25°c, VCC = 5V for L/M/J devices, VCC = 3.3V for T/S devices and VCC = 3V for R devices Parameter Symbol Input Voltage (VCC) Range VCC Supply Current (Unloaded) ICC Conditions TA = 0°C to 70°C J devices VTH T devices S devices R devices Reset Threshold Temp Coefficient VCC to reset delay Reset Pulse Width MR Minimum Pulse Width MR Glitch Immunity MR to RESET Propagation Delay MR Input Threshold MR Delay to MR Retrigger MR pull-up resistance Low RESET output voltage (ASM161) RESET Output Voltage (ASM162) TA = 25°C Note 1 TA = 25°C Note 1 TA = 25°C Note 1 TA = 25°C Note 1 TA = 25°C Note 1 TA = 25°C Note 1 Unit V 15 µA 4.56 4.50 4.31 4.25 3.93 3.89 3.04 3.00 2.89 2.85 2.59 2.55 TCVTH tRPW Max 5.5 6 VCC < 3.6V R/S/T M devices TYP 1.1 VCC < 5.5V L/M/J L Devices Reset Threshold Min 4.5 4.63 4.38 4.00 3.08 2.93 2.63 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 V ppm/ °C µS 30 VCC = VTH to (VTH -100mV) TA = 0°C to 70°C TA = -40°C to 85°C tMR 800 600 20 1400 2000 2240 ms 10 VIH VIL VIH VIL VCC > VTH(MAX), L/M/J devices VCC > VTH(MAX), R/S/T devices tMRD TA = 0°C to 70°C VOH 1.8<VCC<VTHmin., ISOURCE = 150 µA RESET Output Leakage Current (ASM161) ILKG VDRAIN < 6.0V, 0°C < TA < 70°C 0.5 µS 0.7VCC 48 TA = -40°C to 85°C HIGH RESET Output Voltage (ASM162) ns 0.8 85 0.25VCC 122 85 10 VOL 100 2.3 VCC=VTH min., ISINK=1.2mA, ASM161 R/S/T VCC=VTH min., ISINK=3.2mA, ASM161L/M/J VCC > 1.1, ISINK = 50µA VCC=VTH max., ISINK=1.2mA, ASM162 R/S/T VCC=VTH max., ISINK=3.2mA, ASM162 L/M/J VOL µS 20 30 V V V V µS KΩ 0.3 0.4 V 0.3 0.3 V 0.4 0.8VCC V 1 µA Notes: 1. Over operating temperature range. µP Supervisory Circuit Notice: The information in this document is subject to change without notice. 5 of 9 ASM161/ASM162 April 2008 rev 1.5 Package Dimensions Plastic SOT - 143 (4Pin) µP Supervisory Circuit Notice: The information in this document is subject to change without notice. 6 of 9 ASM161/ASM162 April 2008 rev 1.5 Ordering Information Part Number1 Package Marking Reset Threshold (V) Temperature (°C) Pins-Package ASM161LCUS/T 4.63 0 TO 70 4-SOT-143 TALL ASM161MCUS/T 4.38 0 TO 70 4-SOT-143 TBLL (LL Lot Code) Tin Lead Devices ASM161JCUS/T 4.00 0 TO 70 4-SOT-143 TCLL ASM161TCUS/T 3.08 0 TO 70 4-SOT-143 TDLL ASM161SCUS/T 2.93 0 TO 70 4-SOT-143 TELL ASM161RCUS/T 2.63 0 TO 70 4-SOT-143 TFLL ASM162LCUS/T 4.63 0 TO 70 4-SOT-143 TGLL ASM162MCUS/T 4.38 0 TO 70 4-SOT-143 THLL ASM162JCUS/T 4.00 0 TO 70 4-SOT-143 TILL ASM162TCUS/T 3.08 0 TO 70 4-SOT-143 TJLL ASM162SCUS/T 2.93 0 TO 70 4-SOT-143 TKLL ASM162RCUS/T 2.63 0 TO 70 4-SOT-143 TLLL ASM161LEUS/T 4.63 -40 TO 85 4-SOT-143 TMLL ASM161MEUS/T 4.38 -40 TO 85 4-SOT-143 TNLL ASM161JEUS/T 4.00 -40 TO 85 4-SOT-143 TOLL ASM161TEUS/T 3.08 -40 TO 85 4-SOT-143 TPLL ASM161SEUS/T 2.93 -40 TO 85 4-SOT-143 TQLL ASM161REUS/T 2.63 -40 TO 85 4-SOT-143 TRLL ASM162LEUS/T 4.63 -40 TO 85 4-SOT-143 TSLL ASM162MEUS/T 4.38 -40 TO 85 4-SOT-143 TTLL ASM162JEUS/T 4.00 -40 TO 85 4-SOT-143 TULL ASM162TEUS/T 3.08 -40 TO 85 4-SOT-143 TVLL ASM162SEUS/T 2.93 -40 TO 85 4-SOT-143 TWLL ASM162REUS/T 2.63 -40 TO 85 4-SOT-143 TXLL ASM161LCUSF/T 4.63 0 TO 70 4-SOT-143 MALL ASM161MCUSF/T 4.38 0 TO 70 4-SOT-143 MBLL Lead Free Devices ASM161JCUSF/T 4.00 0 TO 70 4-SOT-143 MCLL ASM161TCUSF/T 3.08 0 TO 70 4-SOT-143 MDLL ASM161SCUSF/T 2.93 0 TO 70 4-SOT-143 MELL ASM161RCUSF/T 2.63 0 TO 70 4-SOT-143 MFLL ASM162LCUSF/T 4.63 0 TO 70 4-SOT-143 MGLL ASM162MCUSF/T 4.38 0 TO 70 4-SOT-143 MHLL ASM162JCUSF/T 4.00 0 TO 70 4-SOT-143 MILL ASM162TCUSF/T 3.08 0 TO 70 4-SOT-143 MJLL ASM162SCUSF/T 2.93 0 TO 70 4-SOT-143 MKLL ASM162RCUSF/T 2.63 0 TO 70 4-SOT-143 MLLL µP Supervisory Circuit Notice: The information in this document is subject to change without notice. 7 of 9 ASM161/ASM162 April 2008 rev 1.5 Part Number1 Reset Threshold (V) Temperature (°C) Pins-Package Package Marking ASM161LEUSF/T 4.63 -40 TO 85 4-SOT-143 (LL Lot Code) MMLL ASM161MEUSF/T 4.38 -40 TO 85 4-SOT-143 MNLL ASM161JEUSF/T 4.00 -40 TO 85 4-SOT-143 MOLL ASM161TEUSF/T 3.08 -40 TO 85 4-SOT-143 MPLL ASM161SEUSF/T 2.93 -40 TO 85 4-SOT-143 MQLL ASM161REUSF/T 2.63 -40 TO 85 4-SOT-143 MRLL ASM162LEUSF/T 4.63 -40 TO 85 4-SOT-143 MSLL ASM162MEUSF/T 4.38 -40 TO 85 4-SOT-143 MTLL ASM162JEUSF/T 4.00 -40 TO 85 4-SOT-143 MULL ASM162TEUSF/T 3.08 -40 TO 85 4-SOT-143 MVLL ASM162SEUSF/T 2.93 -40 TO 85 4-SOT-143 MWLL ASM162REUSF/T 2.63 -40 TO 85 4-SOT-143 MXLL Notes: • For parts to be packed in Tape and Reel, add “-T” at the end of the part number. • PulseCore Semiconductor's lead free parts are RoHS compliant. µP Supervisory Circuit Notice: The information in this document is subject to change without notice. 8 of 9 ASM161/ASM162 April 2008 rev 1.5 PulseCore Semiconductor Corporation 1715 S. Bascom Ave Suite 200 Campbell, CA 95008 Tel: 408-879-9077 Fax: 408-879-9018 www.pulsecoresemi.com Copyright © PulseCore Semiconductor All Rights Reserved Part Number: ASM161 / ASM162 Document Version: 1.5 © Copyright 2006 PulseCore Semiconductor Corporation. All rights reserved. Our logo and name are trademarks or registered trademarks of PulseCore Semiconductor. All other brand and product names may be the trademarks of their respective companies. PulseCore reserves the right to make changes to this document and its products at any time without notice. PulseCore assumes no responsibility for any errors that may appear in this document. The data contained herein represents PulseCore’s best data and/or estimates at the time of issuance. PulseCore 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. PulseCore 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 PulseCore 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 PulseCore’s Terms and Conditions of Sale (which are available from PulseCore). All sales of PulseCore products are made exclusively according to PulseCore’s Terms and Conditions of Sale. The purchase of products from PulseCore does not convey a license under any patent rights, copyrights; mask works rights, trademarks, or any other intellectual property rights of PulseCore or third parties. PulseCore 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 PulseCore products in such life-supporting systems implies that the manufacturer assumes all risk of such use and agrees to indemnify PulseCore against all claims arising from such use. µP Supervisory Circuit Notice: The information in this document is subject to change without notice. 9 of 9