austriamicrosystems AS1904, AS1905, AS1906 D a ta S he e t U l t r a L o w - P o w e r µP S u p e r v i s o r y C i r c u i t 1 General Description 2 Key Features The AS1904/5/6 family is an ultra low-power supervisory circuit device. The device can be used to monitor the supply voltage of digital systems and microprocessors and initiate a reset when the voltage goes below a predefined threshold. The duration of the reset is 5/20/100/500ms (typ.) after the supply voltage has risen above the threshold. Low 150nA (typical) Supply Current Precision Monitoring of 2.5-, 3-, and 3.3V-Power Supplies Supply Voltage Range 1.0 to 3.6V Reset Threshold Available from 2.2 to 3.1V Available in three Versions The device exhibits excellent reliability and can reduce application costs by eliminating all external components. - AS1904 Push-Pull RESETN - AS1905 Push-Pull RESET The device is available with different output drivers: - AS1906 Open Drain RESETN The AS1904 has a push-pull driver with an active low reset. The AS1905 uses the same output stage as the AS1904, but has an active high reset. The AS1906 has an open drain output with active low reset. All devices operate down to a voltage of 1V. The reset thresholds are factory-trimmable between 2.2V and 3.08V in steps of approximately 100mV. Each device of the AS1904/5/6 family is offered with four time-out periods of 5/20/100/500ms. The extremely low current consumption of only 150nA (typ) at 3.3V makes the device ideal for use in portable applications. All devices are available in a 3-pin SOT23 package. 4 Time-Out Periods Ranging from 5 to 500ms Detection Voltage Accuracy: ±1.5% Temperature Range: -40 to +85°C SOT23-3 Package Pin Compatible to MAX6326/6327/6328 Superior Upgrade to austriamicrosystems AS1901/2/3 Device Family 3 Applications Wo W orrlldd’s s LLow Po’w ow es Co P C onnssuomweerr estt um pti ptioon! n! Computers Intelligent Instruments Controllers Critical Microprocessor and Microcontroller Power Monitoring Portable/Battery-Powered Equipment Automotive Figure 1. Functional Block Diagrams VCC VCC 3 3 VDD VCC AS1904 AS1905 RESET, RESETN VDD AS1906 Microprocessor 2 GND RESET RESETN GND GND 1 www.austriamicrosystems.com VCC Microprocessor 2 RESET I/O GND 1 Revision 1.4 1-9 austriam i c r o systems AS1904, AS1905, AS1906 Data Sheet 4 Absolute Maximum Ratings Stresses beyond those listed in Table 1 may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Table 1. Absolute Maximum Ratings (TA = 25°C Unless Otherwise Noted) Parameter Limits Units VDD to GND -0.3 to +5 V RESET/RESETN to GND -0.3 to VDD + 0.3 V Input Current (VDD) 20 mA Output Current (RESET, RESETN) 20 mA Rate of Rise (VDD) 100 V/µs Operating Temperature Range (TA) -40 to +85 °C Storage Temperature Range -65 to +150 °C Package-Body Peak Temperature www.austriamicrosystems.com +260 °C Revision 1.4 Notes The reflow peak soldering temperature (body temperature) specified is in accordance with IPC/JEDEC J-STD-020C “Moisture/Reflow Sensitivity Classification for non-hermetic Solid State Surface Mount Devices” 2-9 austriam i c r o systems AS1904, AS1905, AS1906 Data Sheet 5 Electrical Characteristics VDD = Full Range; TA = -40º to +85°C; Unless Otherwise Specified Table 2. Electrical Characteristics Parameter Symbol VDD Range VDD Supply Current IDD RESET Threshold Voltage1 VDD to Reset Delay2 RESET Active Time-Out Period3 Conditions Min TA = 0 to +70°C 1.0 TA = -40 to +85°C 1.2 VDD = 3.3V, No Load VOL RESETN Output Voltage (AS1904) VOH VOH RESET Output Voltage (AS1905) VOL RESET Threshold Hysteresis VHYST Open-Drain RESETN Output Leakage Current (AS1906) ILEAK Unit 3.6 V 3.6 V 150 290 nA VTH 1.5% VTH VTH + 1.5% V TA = -40 to +85°C VTH 2.5% VTH VTH + 2.5% V 20 50 µs tTP tTP + 60% ms ISINK = 1.2mA, VDD = 2.1V, reset asserted 0.4 V ISINK = 400µA, VDD = 1.2V, reset asserted 0.4 V VDD = VTH to (VTH - 100mV) tTP 40% tTP RESETN Output Voltage (AS1904/AS1906) Max TA = +25°C VTH tRD Typ ISOURCE = 1.2mA, VDD = 3.2V 0.8 x VDD V ISOURCE = 500µA, VDD = 2.1V, reset asserted 0.8 x VDD V ISOURCE = 100µA, VDD = 1.2V, reset asserted 0.8 x VDD V ISINK = 1.2mA, VDD = 3.2V, reset not asserted 0.4 10 V mV 0.1 µA Notes: 1 See Table 5, “Coding of Factory-Trimmed Reset Threshold Voltages,” on page 5. 2 Guaranteed by design. 3 See Table 3, “Coding of Factory-trimmed Reset Active Time-Out Period,” on page 5. www.austriamicrosystems.com Revision 1.4 3-9 austriam i c r o systems AS1904, AS1905, AS1906 Data Sheet Interfacing to Microprocessors with Bi-Directional Reset Pins 6 Operation 6.1 Interfacing to Microprocessors with Bi-Directional Reset Pins The device has an open drain RESETN output, which enables easy interfacing to microprocessors (µP) with bi-directional reset pins, such as the Motorola 68HC11. The RESETN pin of the microcontroller (µC) can be connected directly to the µP supervisor's RESETN output with a single pull-up resistor (see Figure 1 on page 1). 6.2 Operating Characteristics Supply Current vs. Temperature VCC = 3.3V P o w er-D o w n R es et D elay vs . T e m p era tu re V O D = 10m V 0.5 200 0.4 Reset Delay (µs) Supply Current (µA) 150 0.3 0.2 100 50 0.1 0 -40 0 -20 0 20 40 60 -4 0 80 -2 0 0 Power-Up Reset Timeout vs. Temperature 40 60 80 Maximum Transient Duration vs. Reset Threshold Overdrive 200 400 Maximum Transient Duration (µs) POWER-UP RESET TIMEOUT (ms) 20 T e mpe rature (°C ) Temperature (°C) 160 120 80 40 300 200 100 0 0 -40 -20 0 20 40 60 80 1 10 100 1000 Reset Threshold Overdrive Vth-Vcc (mV) Temperature (°C) 6.3 Negative-Going VDD Transients The device is optimized to ignore short-duration, negative-going VDD transients (glitches) in order to avoid incorrect resets. In the graph Maximum Transient Duration vs. Reset Threshold Overdrive (page 4) , the conditions are shown, for which the reset pulses are not generated. In the graph the maximum pulse width that a negative VDD transient may have when a reset signal is generated. As the amplitude of the transient increases, the maximum allowable pulse width decreases. www.austriamicrosystems.com Revision 1.4 4-9 austriam i c r o systems AS1904, AS1905, AS1906 Data Sheet 7 Options Table 3. Coding of Factory-trimmed Reset Active Time-Out Period Device tTP in Milliseconds Suffix Min Typ Max AS190x_xx A 3 5 8 AS190x_xx B 12 20 32 AS190x_xx C 60 100 160 AS190x_xx D 300 500 800 Table 4. Output Variants Device Output Functionality AS1904xxx Active Low (RESETN) AS1905xxx Active High (RESET) AS1906xxx Open Drain (RESETN) Table 5. Coding of Factory-Trimmed Reset Threshold Voltages Reset Threshold Voltage, VTH in V Device Suffix TA = +25°C Min TA = -40 to +85°C Typ Max Min Max AS190xx__ 22 2.167 2.2 2.233 2.145 2.255 AS190xx__ 23 2.285 2.32 2.355 2.262 2.378 AS190xx__ 24 2.364 2.4 2.436 2.340 2.460 AS190xx__ 25 2.463 2.5 2.538 2.438 2.563 AS190xx__ 26 2.591 2.63 2.669 2.564 2.696 AS190xx__ 27 2.660 2.7 2.741 2.633 2.768 AS190xx__ 28 2.758 2.8 2.842 2.730 2.870 AS190xx__ 29 2.886 2.93 2.974 2.857 3.003 AS190xx__ 30 2.955 3.0 3.045 2.925 3.075 AS190xx__ 31 3.034 3.08 3.126 3.003 3.157 www.austriamicrosystems.com Revision 1.4 5-9 austriam i c r o systems AS1904, AS1905, AS1906 Data Sheet Pin Assignments 8 Pinout and Packaging 8.1 Pin Assignments Figure 2. Pin Assignments (Top View) Top View GND 1 AS1904 AS1905 AS1906 RESETN, RESET 3 VDD 2 SOT23-3 8.2 Pin Descriptions Table 6. Pin Descriptions Pin Number AS1904/AS1906 AS1905 1 1 Pin Name Description GND Ground 2 - RESETN Active-low reset output. RESETN remains low while VDD is below the reset threshold and for tTP after VDD rises above the reset threshold. RESETN is open-drain on the AS1906 and push-pull on the AS1904. - 2 RESET Active-high reset output. RESET remains high while VDD is below the reset threshold and for tTP after VDD rises above the reset threshold. 3 3 VDD Supply voltage. www.austriamicrosystems.com Revision 1.4 6-9 austriam i c r o systems AS1904, AS1905, AS1906 Data Sheet Package Drawings and Markings 8.3 Package Drawings and Markings The device is available in a 3-pin SOT-23 package. Figure 3. 3-Pin SOT-23 Package. www.austriamicrosystems.com Revision 1.4 7-9 austriam i c r o systems AS1904, AS1905, AS1906 Data Sheet 9 Ordering Information The device is available in the following standard versions. Standard Part Threshold (V) Duration (mS) Marking AS1904C23 2.32 100 ASGI AS1904C26 2.63 100 ASDB AS1904C31 3.08 100 ASDG AS1905C23 2.32 100 ASDI AS1905C26 2.63 100 ASDL AS1905C31 3.08 100 ASDQ AS1906C23 2.32 100 ASDS AS1906C26 2.63 100 ASDV AS1906C28 2.8 100 ASDX AS1906C31 3.08 100 ASGK Non-standard versions require a minimum order of 30,000 units. Contact austriamicrosystems for availability of nonstandard versions. www.austriamicrosystems.com Revision 1.4 8-9 austriam i c r o systems AS1904, AS1905, AS1906 Data Sheet Copyrights Copyright © 1997-2005, austriamicrosystems AG, Schloss Premstaetten, 8141 Unterpremstaetten, Austria-Europe. Trademarks Registered ®. All rights reserved. The material herein may not be reproduced, adapted, merged, translated, stored, or used without the prior written consent of the copyright owner. All products and companies mentioned are trademarks or registered trademarks of their respective companies. Disclaimer Devices sold by austriamicrosystems AG are covered by the warranty and patent indemnification provisions appearing in its Term of Sale. austriamicrosystems AG makes no warranty, express, statutory, implied, or by description regarding the information set forth herein or regarding the freedom of the described devices from patent infringement. austriamicrosystems AG reserves the right to change specifications and prices at any time and without notice. Therefore, prior to designing this product into a system, it is necessary to check with austriamicrosystems AG for current information. This product is intended for use in normal commercial applications. Applications requiring extended temperature range, unusual environmental requirements, or high reliability applications, such as military, medical life-support or lifesustaining equipment are specifically not recommended without additional processing by austriamicrosystems AG for each application. The information furnished here by austriamicrosystems AG is believed to be correct and accurate. However, austriamicrosystems AG shall not be liable to recipient or any third party for any damages, including but not limited to personal injury, property damage, loss of profits, loss of use, interruption of business or indirect, special, incidental or consequential damages, of any kind, in connection with or arising out of the furnishing, performance or use of the technical data herein. No obligation or liability to recipient or any third party shall arise or flow out of austriamicrosystems AG rendering of technical or other services. Contact Information Headquarters austriamicrosystems AG A-8141 Schloss Premstaetten, Austria Tel: +43 (0) 3136 500 0 Fax: +43 (0) 3136 525 01 e-mail: [email protected] For Sales Offices, Distributors and Representatives, please visit: http://www.austriamicrosystems.com austriamicrosystems www.austriamicrosystems.com Revision 1.4 – a leap ahead 9-9