ASM1834/A/D April 2005 rev 1.3 Dual 5V and 3.3V µP Power Supply Supervisor with Manual Reset General Description All devices operate over the extended industrial temperature The ASM1834 supervisors simultaneously monitor both 3.3V and 5V power sources and generate reset signals when either supply is out of tolerance. When an out-of-tolerance condition is range. Devices are available in 8-pin DIP, surface mount 8-pin SO and 8-Pin MicroSO packages. Die are also available. detected, the output-reset signal of the affected supply Key Features becomes active and resets the system microprocessor/ • Monitors 5V and 3.3V supplies simultaneously microcontroller. On power-up and after the supply voltage • 5V and 3.3V power-on reset returns to an in-tolerance condition, the reset signal remains • 350ms reset time active for approximately 350ms. This allows the power supply • Debounced pushbutton reset input and system microprocessor to stabilize. • Push-pull CMOS output • ASM1834, ASM1834D • Eliminates external pull-up resistors Tolerance levels are independently selectable for both supplies. • Active LOW (ASM1834), HIGH (ASM1834D) Tolerance options are 5% and 10% percent for the 5V supply and 10% and 20% percent for the 3.3V supply. • Open Drain Output • ASM1834A • Active LOW The ASM1834 and ASM1834D have push-pull reset output stages. The ASM1834A reset outputs are open drain devices • Selectable 5V and 3.3V trip point tolerance that can both be connected to either 5V or 3.3V supply. The • Internal power drawn from highest input voltage, 5V or ASM1834D has active HIGH reset outputs. • Precision temperature-compensated voltage reference and All devices can generate reset signals through an internally • Low cost surface mount SO, compact MicroSO and DIP • Wide operating temperature, -40°C to +85°C 3.3V ASM1834 and ASM1834A have active LOW reset outputs. The comparator packages. debounced pushbutton reset input that affects both reset outputs. Applications Typical Operating Circuit • Microprocessors • PDAs, Hand-held PCs • Embedded Controllers • Telecommunication Systems • Power Supplies • Wireless / Cellular Systems • Networking Hardware 3.3V +5V ASM1834 5V 3.3V µP 5VIN 3.3VIN RESET RESET PBRST 5VTOL GND 3.3VTOL 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 ASM1834/A/D April 2005 rev 1.3 Block Diagram ASM1834A ASM1834 1 5 VIN 2 5V RESET 3 5 VTOL 5V Tolerance Bias + For ASM1834D 350ms Delay Low TC Reference 2 5V RESET - 5V RESET (ASM1834D) 7 3.3V RESET 40kΩ PBRST 3.3 VIN 5 Pushbutton Level Sense and Debounce 8 3.3 VTOL 6 GND 3.3V Tolerance Bias For ASM1834D + 350ms Delay 7 3.3V RESET 3.3V RESET (ASM1834D) - 4 Pin Configuration 5VIN 8 1 5V RESET * 2 5V TOL 3 GND 4 ASM1834 ASM1834A ASM1834D 7 3.3VIN 3.3V RESET * 6 3.3V TOL 5 PBRST * AS1834D reset outputs are active HIGH (5V RESET and 3.3V RESET) Outputs are open-drain for AS1834A. Pin Description Pin # Pin Name 1 5VIN 2 5V RESET 5V RESET 3 5V TOL 4 GND 5 PBRST 6 3.3V TOL 7 3.3V RESET 3.3V RESET 8 3.3VIN Function 5V power supply input. 5V reset output (Active LOW, ASM1834, ASM1834A. Open drain outputs for ASM1834A). 5V reset output (Active HIGH, AS1834D). 5V input tolerance select: 10% tolerance for 5VTOL= 5VIN and 5% tolerance for 5VTOL = GND Ground. Debounced manual pushbutton reset input (40kΩ internal pull-up). 3.3V input tolerance select: 20% tolerance for 3.3VTOL = 3.3VIN and 10% tolerance for 3.3VTOL=GND. 3.3V reset output (Active LOW, ASM1834, ASM1834A. Open drain outputs for ASM1834A). 3.3V reset output (Active HIGH, AS1834D). 3.3V power supply input. Dual 5V and 3.3V µP Power Supply Supervisor with Manual Reset Notice: The information in this document is subject to change without notice 2 of 10 ASM1834/A/D April 2005 rev 1.3 Detailed Description tF VIN Operation Power Monitor VINTP (MAX) The ASM1834 supervisors simultaneously detect out-of- VINTP VINTP (MIN) tolerance power supply conditions on both 3.3V and 5V the tolerance band, the reset for the falling supply voltage ~~ power supplies. If the voltages at 5VIN or 3.3VIN are outside RESET tRPD becomes active. When the monitored supply returns to an in- RESET approximately 350ms after the power supply voltages have reached the selected tolerance. This allows the power supply and microprocessor to stabilize before the reset is removed. All supply current for the ASM1834 devices is drawn from the input (5VIN or 3.3VIN) with the highest voltage level. The outputs draw current from their input supplies 5VIN and 3.3VIN. ~ ~~ VOL 350ms before returning to the inactive state. On power-up, the reset signals are kept active for RESET Slews with VCC VOH tolerance state, the reset remains active for approximately Figure 2: Timing Diagram: Power Down (ASM1834D only) Reset Signal Polarity and Output Stage Structure The ASM1834 and the ASM1834A supervisors have active LOW reset signals. The ASM1834D reset outputs are active HIGH. The ASM1834 and the ASM1834D have CMOS push-pull output stages. The ASM1834A has open drain reset outputs. tR VINTP(MAX) VINTP(MIN) ~~ RESET Polarity Output Stage Configuration ASM1834 LOW Push-Pull ASM1834U LOW Push-Pull ASM1834S LOW Push-Pull ASM1834A LOW Open Drain ASM1834AU LOW Open Drain ASM1834AS LOW Open Drain ASM1834D HIGH Push-Pull ASM1834DU HIGH Push-Pull ASM1834DS HIGH Push-Pull VINTP tRPU VIN RESET VOH ~ ~~~ Part # VOL RESET Figure 1: Timing Diagram: Power Up (ASM1834D only) Dual 5V and 3.3V µP Power Supply Supervisor with Manual Reset Notice: The information in this document is subject to change without notice 3 of 10 ASM1834/A/D April 2005 rev 1.3 Manual Reset Operation Reset Output Signal Push-button switch input, PBRST, allows the user to override Reset output signals are valid as long as either voltage at the internal trip point detection circuits and issue reset 5VIN or 3.3VIN is above 1.2V. In addition, the ASM1834 has signals. The pushbutton input is debounced and is pulled push-pull outputs that can remain valid below a 1.2V input HIGH through an internal 40kΩ resistor. level. To sink current below 1.2V, a resistor should be When at least one of the reset outputs is not asserted, a push guarantees a valid reset signal down to 0V. A 100kΩ value is button initiated reset signal can be issued by holding PBRST suggested. connected from the RESET output to ground. This resistor LOW for at least 2ms. When PBRST is held LOW, both resets become active and remain active for approximately 350ms The AS1834A open drain reset outputs require pull-up after PBRST returns HIGH. (See figures 3 and 4). resistors and must be low enough in value to pull the output into a HIGH state. Resistor value is not critical in most applications and a value of 10kΩ is suggested. (See Figures 5 and 6). 3.3V 5V ASM1834 The ASM1834A open drain reset outputs can be connected 3.3VIN 8 to the same potential through a single pull-up resistor. In this 2 5V RESET 3.3V RESET 7 LOW reset. If the inputs are pulled-up to different voltages, 3 the reset outputs (pin 2 and pin 7) cannot be connected to 1 5VIN 4 5VTOL 3.3VTOL GND PBRST configuration a failure on either supply will generate an active 6 form a wired “AND” (see figure 7). 5 µP Input RESET Figure 3: Pushbutton Reset 100kΩ tPB PBRST Figure 5: ASM1834 RESET Valid to 0V VIH tPDLY VIL ~ RESET ASM1834 tRST ~~ RESET 3.3V 5V VOH VOL 10kΩ 1 5VIN 10kΩ 2 5V RESET 3.3V RESET 7 3 Figure 4: Timing Diagram: Pushbutton Reset 3.3VIN 8 4 5VTOL GND 3.3VTOL PBRST 6 5 Figure 6: ASM1834A Open Drain Output Pull-Up Resistor Dual 5V and 3.3V µP Power Supply Supervisor with Manual Reset Notice: The information in this document is subject to change without notice 4 of 10 ASM1834/A/D April 2005 rev 1.3 5V 3.3V 5V or 3.3V 10kΩ ASM1834A 1 2 5VIN 3.3VIN 5VRESET 3.3VRESET 3 8 7 6 3.3V TOL 5V TOL 4 GND PBRST 5 Figure 7: ASM1834A Wired “OR” Connection Trip Point Tolerance Selection If 3.3VTOL is connected to the 3.3V supply input, a 20% The 3.3VTOL and 5VTOL inputs allow independent selection of tolerance is selected. If 3.3VTOL is grounded, a 10% tolerance the reset trip points. If 5VTOL is connected to the 5V supply is selected. (Refer table below). The 3.3VTOL and 5VTOL input, a 10% tolerance is selected. If 5VTOL is grounded, a 5% tolerance select inputs should be tied to the ground or to the tolerance is selected. respective input supply voltage pin, 3.3VIN or 5VIN. 3.3V Input Tolerance Select 3.3V Tolerance 5V Input TRIP Point (V) MIN NOM MAX 5V Tolerance TRIP Point (V) MIN NOM MAX 5VTOL = 5VIN - - - - 10% 4.25 4.38 4.49 5VTOL = GND - - - - 5% 4.5 4.63 4.75 3.3VTOL = 3.3VIN 20% 2.47 2.55 2.64 - - - - 3.3VTOL = GND 10% 2.80 2.88 2.97 - - - - Dual 5V and 3.3V µP Power Supply Supervisor with Manual Reset Notice: The information in this document is subject to change without notice 5 of 10 ASM1834/A/D April 2005 rev 1.3 Absolute Maximum Ratings Parameter Min Max Unit Voltage on VCC -0.5 7 V Voltage on 5V RESET -0.5 +5VIN + 0.5V V Voltage on 3.3V RESET -0.5 +3.3VIN + 0.5V V Voltage on PBRST and reset outputs -0.5 whichever is greater V Operating Temperature Range -40 +85 °C - 260 °C -55 +125 °C 2 200 KV V (+5VIN + 0.5V) or (+3.3VIN + 0.5V) Soldering Temperature (for 10 sec) Storage Temperature ESD rating HBM MM 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. Recommended DC Operating Conditions Recommended DC operating condition over the operating temperature range of -40°C to +85°C. All voltages are referenced to ground. Parameter Symbol 5V Supply Voltage 5VIN 3.3V Supply Voltage 3.3VIN PBRST Input High Level VIH PBRST Input High Level VIH PBRST Input Low Level VIL Conditions Min Typ Max Unit 1.2 5.5 V 1.2 5.5 V Both 3.3VIN and 5VIN >=2.7V 2 VINMAX + 0.3 V Both 3.3VIN and 5VIN <=2.7V VINMAX - 0.4 -0.3 V 0.5 Dual 5V and 3.3V µP Power Supply Supervisor with Manual Reset Notice: The information in this document is subject to change without notice V 6 of 10 ASM1834/A/D April 2005 rev 1.3 DC Electrical Characteristics Unless otherwise noted, VIN = 1.2V to 5.5V and specifications are over the operating temperature range of -40°C to 85°C. Parameter Symbol Conditions Min Typ Max Unit Output = 2.4V. Either 3.3VIN or 5.5VIN Output Current IOH Output Current IOL Output Voltage VOH Input Leakage IIL 5V Operating Current ICC 3.3V Operating Current ICC 350 >=2.7V (ASM1834/1834D only) µA Output = 0.4V. Either 3.3VIN or 5.5VIN >=2.7V (ASM1834/1834D only) 10 mA VIN - 0.1V -1.0 3.3VIN and 5VIN<=5.5V, RESET outputs open. 3.3VIN and 5VIN<=3.6V, RESET outputs open. V +1.0 µA 16 30 µA 12 25 µA 5V Trip Point VINTP 5VTOL = GND 4.50 4.63 4.75 V 5V Trip Point VINTP 5VTOL = 5VIN 4.25 4.38 4.49 V 3.3V Trip Point VINTP 3.3VTOL = GND 2.80 2.88 2.97 V 3.3V Trip Point VINTP 3.3VTOL = 3.3VIN 2.47 2.55 2.64 V Output Capacitance COUT 10 pF PBRST Manual Reset Minimum Low Time tPB PBRST Stable LOW to reset Active tPDLY Reset Active Time tRST 2 200 ms 350 2 ms 500 ms VCC Slew Rate tF VINTP(MAX) to VINTP(MIN) 300 µs VCC Slew Rate tR VINTP(MIN) to VINTP(MAX) 0 ns VCC Detect to RESET or RESET VCC Detect Noise Immunity tRPU trise = 5µs 200 350 tRPD 500 ms 2 µs Dual 5V and 3.3V µP Power Supply Supervisor with Manual Reset Notice: The information in this document is subject to change without notice 7 of 10 ASM1834/A/D April 2005 rev 1.3 Package Information MicroSO (8-Pin) Dimensions Symbol Inches A A1 A2 b C D e E1 E L a S Min Max 0.032 0.044 0.002 0.006 0.030 0.038 0.012 BSC 0.004 0.008 0.114 0.122 0.0256 BSC 0.114 0.122 0.184 0.200 0.016 0.026 0° 6° 0.0206 BSC Symbol Inches Millimeters Min Max 0.81 1.10 0.05 0.15 0.76 0.97 0.30 BSC 0.10 0.20 2.90 3.10 0.65 BSC 2.90 3.10 4.67 5.08 0.41 0.66 0° 6° 0.52 BSC Dimensions SO (8-PIN) A1 H E D Max Min Max 0.004 0.010 0.10 0.25 A 0.053 0.069 1.35 1.75 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 E 0.154 BSC 3.91 BSC e 0.050 BSC 1.27 BSC H A2 A C e A1 D θ Millimeters Min 4.90 BSC 0.236 BSC 6.00 BSC L 0.016 0.050 0.41 1.27 θ 0° 8° 0° 8° L B PLASTIC DIP (8-PIN) Dimensions Symbol Inches Millimeters Min Max Min Max 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 8.26 E 0.300 0.325 7.62 E1 0.240 0.280 6.10 e 0.10 BSC 7.11 2.54 BSC eB ….. 0.430 ….. 10.92 L 0.115 0.150 2.92 3.81 Dual 5V and 3.3V µP Power Supply Supervisor with Manual Reset Notice: The information in this document is subject to change without notice 8 of 10 ASM1834/A/D April 2005 rev 1.3 Ordering Information Reset Polarity Operating Temperature Range Output Stage Package Package Marking ASM1834 LOW -40°C TO 85°C Push-Pull 8-DIP ASM1834 ASM1834U LOW -40°C TO 85°C Push-Pull MicroSO ASM1834U ASM1834S LOW -40°C TO 85°C Push-Pull 8-SO ASM1834S ASM1834A LOW -40°C TO 85°C Open Drain 8-DIP ASM1834A ASM1834AU LOW -40°C TO 85°C Open Drain MicroSO ASM1834AU ASM1834AS LOW -40°C TO 85°C Open Drain 8-SO ASM1834AS ASM1834D HIGH -40°C TO 85°C Push-Pull 8-DIP ASM1834D ASM1834DU HIGH -40°C TO 85°C Push-Pull MicroSO ASM1834DU ASM1834DS HIGH -40°C TO 85°C Push-Pull 8-SO ASM1834DS ASM1834F LOW -40°C TO 85°C Push-Pull 8-DIP ASM1834F ASM1834UF LOW -40°C TO 85°C Push-Pull MicroSO ASM1834UF ASM1834SF LOW -40°C TO 85°C Push-Pull 8-SO ASM1834SF ASM1834AF LOW -40°C TO 85°C Open Drain 8-DIP ASM1834AF ASM1834AUF LOW -40°C TO 85°C Open Drain MicroSO ASM1834AUF ASM1834ASF LOW -40°C TO 85°C Open Drain 8-SO ASM1834ASF ASM1834DF HIGH -40°C TO 85°C Push-Pull 8-DIP ASM1834DF ASM1834DUF HIGH -40°C TO 85°C Push-Pull MicroSO ASM1834DUF ASM1834DSF HIGH -40°C TO 85°C Push-Pull 8-SO ASM1834DSF Part Number TIN - LEAD DEVICES LEAD FREE DEVICES Note: For parts to be packed in Tape and Reel, add “-T” at the end of the part number. Dual 5V and 3.3V µP Power Supply Supervisor with Manual Reset Notice: The information in this document is subject to change without notice 9 of 10 ASM1834/A/D 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: ASM1834/A/D Document Version: 1.3 © 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. 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