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April 2008 rev 1.5
ASM161/ASM162
P Supervisory Circuit
General Description
The ASM161 and ASM162 are cost effective, low power supervisory circuits that monitor power supplies in 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. operated Low power consumption 3V makes the ASM161/162 ideal for use in portable and battery equipments. With 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 0c to 70c and -40c to +85c.
Reset Threshold Part Suffix L M J T S R Voltage (V) 4.63 4.38 4.00 3.08 2.93 2.63
Key Features
* 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 ASM811/812 * Small 4-Pin SOT-143 package * Two temperature ranges: 0c to 70c and -40c to +85c
Applications
* PDAs * Appliances * Computers and embedded controllers * Wireless communication systems * 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.
April 2008 rev 1.5 Typical Operating Circuit
ASM161/ASM162
Block Diagram
Pin Configuration
RESET is open drain
P Supervisory Circuit
Notice: The information in this document is subject to change without notice.
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April 2008 rev 1.5 Pin Description
Pin # ASM161 1 2 ASM162 1 Pin Name GND RESET Ground. Function
ASM161/ASM162
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. 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
-
2
RESET
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. Manual Reset 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. 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 Description
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. 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 pullup 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.
Part Number ASM161 ASM162
Reset Polarity LOW (use external pull-up resistor) HIGH
P Supervisory Circuit
Notice: The information in this document is subject to change without notice.
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April 2008 rev 1.5
ASM161/ASM162
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.
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.
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 Lead Temperature (soldering, 10 sec) ESD rating HBM MM 2 200 KV V -40 -65 -0.3 -0.3 6.0 VCC + 0.3 20 100 320 85 160 300 V V mA V/s mW C C C
Min
Max
Unit
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.
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April 2008 rev 1.5 Electrical Characteristics
ASM161/ASM162
Unless otherwise noted, VCC is over the full range and TA = 0c to 70c for ASM161/162 X C and TA = -40c to +85c for ASM161/162 X E devices. Typical values at TA = 25c, 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 ICC L Devices M devices J devices
Conditions
TA = 0C to 70C VCC < 5.5V L/M/J VCC < 3.6V R/S/T TA = 25C Note 1 TA = 25C Note 1 TA = 25C Note 1 TA = 25C Note 1 TA = 25C Note 1 TA = 25C Note 1
Min
1.1
TYP
Max
5.5 15
Unit
V A
6 4.5 4.63 4.38 4.00 3.08 2.93 2.63 30
Reset Threshold
VTH
T devices S devices R devices
4.56 4.50 4.31 4.25 3.93 3.89 3.04 3.00 2.89 2.85 2.59 2.55
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
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
TCVTH VCC = VTH to (VTH -100mV) TA = 0C to 70C TA = -40C to 85C 800 600 10
tRPW tMR
20 1400
ppm/ C S 2000 2240 ms S
100 0.5 VIH VIL VIH VIL tMRD VCC > VTH(MAX), L/M/J devices VCC > VTH(MAX), R/S/T devices TA = 0C to 70C TA = -40C to 85C 10 VCC=VTH min., ISINK=1.2mA, ASM161 R/S/T VCC=VTH min., ISINK=3.2mA, ASM161L/M/J VCC > 1.1, ISINK = 50A VCC=VTH max., ISINK=1.2mA, ASM162 R/S/T VCC=VTH max., ISINK=3.2mA, ASM162 L/M/J 1.8ns S V V V V S K
MR Delay to MR Retrigger MR pull-up resistance Low RESET output voltage (ASM161)
VOL
V
RESET Output Voltage (ASM162) HIGH RESET Output Voltage (ASM162) RESET Output Leakage Current (ASM161)
VOL
V 0.4 V A
VOH ILKG
Notes: 1. Over operating temperature range.
P Supervisory Circuit
Notice: The information in this document is subject to change without notice.
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April 2008 rev 1.5 Package Dimensions
Plastic SOT - 143 (4Pin)
ASM161/ASM162
P Supervisory Circuit
Notice: The information in this document is subject to change without notice.
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April 2008 rev 1.5 Ordering Information
Part Number1 Tin Lead Devices 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 Lead Free Devices ASM161LCUSF/T ASM161MCUSF/T ASM161JCUSF/T ASM161TCUSF/T ASM161SCUSF/T ASM161RCUSF/T ASM162LCUSF/T ASM162MCUSF/T ASM162JCUSF/T ASM162TCUSF/T ASM162SCUSF/T ASM162RCUSF/T 4.63 4.38 4.00 3.08 2.93 2.63 4.63 4.38 4.00 3.08 2.93 2.63 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 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 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 Reset Threshold (V) Temperature (C)
ASM161/ASM162
Pins-Package
Package Marking
(LL Lot Code) TALL TBLL TCLL TDLL TELL TFLL TGLL THLL TILL TJLL TKLL TLLL TMLL TNLL TOLL TPLL TQLL TRLL TSLL TTLL TULL TVLL TWLL TXLL MALL MBLL MCLL MDLL MELL MFLL MGLL MHLL MILL MJLL MKLL MLLL
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 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
P Supervisory Circuit
Notice: The information in this document is subject to change without notice.
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April 2008 rev 1.5
Part Number1 ASM161LEUSF/T ASM161MEUSF/T ASM161JEUSF/T ASM161TEUSF/T ASM161SEUSF/T ASM161REUSF/T ASM162LEUSF/T ASM162MEUSF/T ASM162JEUSF/T ASM162TEUSF/T ASM162SEUSF/T ASM162REUSF/T 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 Temperature (C) -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
ASM161/ASM162
Pins-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
Package Marking
(LL Lot Code) MMLL MNLL MOLL MPLL MQLL MRLL MSLL MTLL MULL MVLL MWLL 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.
P Supervisory Circuit
Notice: The information in this document is subject to change without notice.
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April 2008 rev 1.5
ASM161/ASM162
PulseCore Semiconductor Corporation 1715 S. Bascom Ave Suite 200 Campbell, CA 95008 Tel: 408-879-9077 Fax: 408-879-9018 www.pulsecoresemi.com
Copyright (c) PulseCore Semiconductor All Rights Reserved Part Number: ASM161 / ASM162 Document Version: 1.5
(c) 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.
P Supervisory Circuit
Notice: The information in this document is subject to change without notice.
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