ASM161, ASM162 mP Supervisory Circuit 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 at least 800 ms 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 49 mS 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 3 V supplies, power consumption is 8 mW typically and 30 mW 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 2.63 V to 4.63 V, the ASM161/162 are suitable for monitoring 5 V, 3.6 V and 3.0 V supplies. The ASM161/162 are available in temperature ranges 0C to 70C and -40C to +85C. http://onsemi.com SOT-143 4 LEAD CASE 527AF PIN CONFIGURATIONS 1 VCC GND RESET 1 GND VCC MR RESET MR ASM161 (Top View) ASM162 (Top View) RESET is open drain RESET THRESHOLD Part Suffix Voltage (V) L 4.63 Features M 4.38 * * * * * * J 4.00 * * * * * * Edge Triggered Manual Reset Input Single Pulse Output 49 mS Minimum MR Disable Period After Reset CMOS/TTL Logic or Switch Interface Debounced Input Low Supply Current Extends Battery Life 6 mA / 15 mA typ/max at 5.5 V 4.5 mA / 10 mA typ/max at 3.6 V 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 (c) Semiconductor Components Industries, LLC, 2011 August, 2011 - Rev. 3 T 3.08 S 2.93 R 2.63 ORDERING INFORMATION See detailed ordering and shipping information in the package dimensions section on page 6 of this data sheet. Applications * * * * * * * 1 PDAs Appliances Computers and Embedded Controllers Wireless Communication Systems Battery Operated and Intelligent Instruments Automotive Systems Safety Systems Publication Order Number: ASM161/D ASM161, ASM162 Figure 1. Typical Operating Circuit Figure 2. Block Diagram Table 1. PIN DESCRIPTION Pin # ASM161 ASM162 Pin Name 1 1 GND 2 - RESET Active-LOW, open-drain reset output. RESET remains LOW while VCC is below the reset threshold and for 800 ms 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 800 ms after VCC rises above the reset threshold. 3 3 MR 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. 4 4 VCC Power supply input voltage. Function Ground. Detailed Description 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 pull-up resistor. Output leakage current is under 1 mA. A high resistance value can be used to minimize current drain. The ASM162 generates an active-HIGH RESET output. 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 800 ms after VCC has risen above the reset threshold and is guaranteed to be no more than 2 seconds. The rest http://onsemi.com 2 ASM161, ASM162 Part Number Reset Polarity ASM161 LOW (use external pull-up resistor) ASM162 HIGH 49 mS but not more than 122 mS. 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 20 kW pull-up resistor. MR can be left open if not used. 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 Figure 3. Manual Reset Timing Figure 4. RESET Valid with VCC under 1.1 V Application Information Valid Reset with VCC under 1.1 V To ensure that logic inputs connected to the ASM162 RESET pin are in a known state when VCC is under 1.1 V, a 100 kW pull-down resistor at RESET is needed. The value is not critical. This scheme does not work with the open-drain outputs of ASM161. Glitch Resistance The ASM161/162 are relatively immune to short duration negative-going VCC transients/glitches. A VCC transient that goes 100 mV below the reset threshold and lasts 20s or less will not typically cause a reset pulse. Table 2. ABSOLUTE MAXIMUM RATINGS Parameter Min Max Unit -0.3 -0.3 6.0 VCC + 0.3 20 V V mA Rate of Rise at VCC 100 V/ms Power Dissipation (TA = 70C) 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 Lead Temperature (soldering, 10 sec) 300 C ESD rating HBM MM 2 200 KV V Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect device reliability. http://onsemi.com 3 ASM161, ASM162 Table 3. ELECTRICAL CHARACTERISTICS (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 = 5 V for L/M/J devices, VCC = 3.3 V for T/S devices and VCC = 3 V for R devices.) Parameter Symbol Conditions Min Input Voltage (VCC) Range VCC TA = 0C to 70C 1.1 Supply Current (Unloaded) ICC Reset Threshold Reset Threshold Temp Coefficient VTH Reset Pulse Width MR Minimum Pulse Width Unit 5.5 V mA VCC < 5.5 V L/M/J 6 15 TA = 0C to 70C, TA = -40C to +85C VCC < 3.6 V R/S/T 4.5 10 L Devices TA = 25C (Note 1) 4.56 4.50 4.63 4.70 4.75 M devices TA = 25C (Note 1) 4.31 4.25 4.38 4.45 4.50 J devices TA = 25C (Note 1) 3.93 3.89 4.00 4.06 4.10 T devices TA = 25C (Note 1) 3.04 3.00 3.08 3.11 3.15 S devices TA = 25C (Note 1) 2.89 2.85 2.93 2.96 3.00 R devices TA = 25C (Note 1) 2.59 2.55 2.63 2.66 2.70 VCC = VTH to (VTH -100 mV) tRPW Max TA = 0C to 70C, TA = -40C to +85C TCVTH VCC to reset delay Typ TA = 0C to 70C 800 TA = -40C to 85C 600 tMR V 30 ppm/ C 20 mS 1400 2000 ms 2240 10 mS MR Glitch Immunity 100 ns MR to RESET Propagation Delay 0.5 mS MR Input Threshold VIH VCC > VTH(MAX), L/M/J devices 2.3 V VIL VIH 0.8 VCC > VTH(MAX), R/S/T devices 0.7VCC V VIL MR Delay to MR Retrigger tMRD 0.25VCC V 122 mS 30 KW VCC = VTH min., ISINK = 1.2 mA, ASM161 R/S/T 0.3 V VCC = VTH min., ISINK = 3.2 mA, ASM161L/M/J 0.4 VCC > 1.1, ISINK = 50 mA 0.3 VCC = VTH max., ISINK = 1.2 mA, ASM162 R/S/T 0.3 VCC = VTH max., ISINK = 3.2 mA, ASM162 L/M/J 0.4 TA = 0C to 70C 48 TA = -40C to 85C MR pull-up resistance Low RESET output voltage (ASM161) RESET Output Voltage (ASM162) VOL HIGH RESET Output Voltage (ASM162) VOH 1.8 < VCC < VTHmin., ISOURCE = 150 mA 1. Over operating temperature range. http://onsemi.com 4 85 85 10 VOL V 0.8VCC 20 V V ASM161, ASM162 PACKAGE DIMENSIONS SOT-143, 4 Lead CASE 527AF-01 ISSUE A SYMBOL MIN A 0.80 1.22 D A1 0.05 0.15 e A2 0.75 b 0.30 0.50 b2 0.76 0.89 c 0.08 D 2.80 4 3 E1 1 E E 2.10 E1 1.20 e 2 TOP VIEW 0.40 0.20 2.90 3.04 1.30 1.40 2.64 0.50 L1 0.54 REF L2 0.25 A2 0 c L b2 A1 L1 SIDE VIEW END VIEW Notes: (1) All dimensions are in millimeters. Angles in degrees. (2) Complies with JEDEC TO-253. http://onsemi.com 5 0.60 8 q A 1.07 0.20 BSC L b 0.90 MAX 1.92 BSC e1 e1 NOM L2 ASM161, ASM162 Table 4. ORDERING INFORMATION Part Number (Note 2) Reset Threshold (V) Temperature (5C) Pins-Package Package Marking (LL Lot Code) TIN LEAD DEVICES ASM161LCUS/T 4.63 0 TO 70 4-SOT-143 TALL ASM161MCUS/T 4.38 0 TO 70 4-SOT-143 TBLL 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 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 LEAD FREE DEVICES 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 ASM161LEUSF/T 4.63 -40 TO 85 4-SOT-143 MMLL ASM161MEUSF/T 4.38 -40 TO 85 4-SOT-143 MNLL 2. For parts to be packed in Tape and Reel, add "-T" at the end of the part number. ON Semiconductor lead free parts are RoHS compliant. http://onsemi.com 6 ASM161, ASM162 Table 4. ORDERING INFORMATION (continued) Part Number (Note 2) Reset Threshold (V) Temperature (5C) Pins-Package Package Marking (LL Lot Code) LEAD FREE DEVICES 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 2. For parts to be packed in Tape and Reel, add "-T" at the end of the part number. ON Semiconductor lead free parts are RoHS compliant. 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