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as1901, as1902, as1903 ultra low-power p supervisory circuit data sheet www.austriamicrosystems.co m revision 1.51 1 - 9 1 general description the as1901/2/3 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. the as1901/2/3 exhibit excellent reliability and can reduce application costs by eliminating all external com- ponents. the device is available wit h different output drivers: ! the as1901 has a push-pull driver with an active low reset. ! the as1902 uses the same output stage as the as1901, but has an active high reset. ! the as1903 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 as1901/2/3 family is offered with four time-out periods of 5/20/100/500ms. the extremely low current co nsumption of only 230na (typ) at 3.3v makes the device ideal for use in portable applications. all devices are available in a 3-pin sot23 package. figure 1. functional block diagrams 2 key features ! low 230na (typ) supply current ! precision monitoring of 2.5-, 3-, and 3.3v-power supplies ! supply voltage range: 1.0 to 3.6v ! reset threshold range: 2.2 to 3.1v ! available in 3 versions: - as1901 push pull resetn - as1902 push pull reset - as1903 open drain resetn ! 4 time-out periods ranging from 5 to 500ms ! detection voltage accuracy: 1.5% ! temperature range: -40 to +85c ! package: sot23-3 3 applications the devices are ideal for co mputers, intelligent instru- ments, controllers, critical microprocessor and micro- controller, power monitoring and portable/battery- powered equipment. v cc as1903 microprocessor v dd gnd gnd resetn reset i/o v cc 1 2 3 v cc as1901 as1902 microprocessor v dd gnd gnd resetn, reset reset v cc 1 2 3 ams ag technical content still valid
www.austriamicrosystems.co m revision 1.51 2 - 9 as1901, as1902, as1903 data sheet - pinout 4 pinout pin assignments figure 2. pin assignments (top view) pin descriptions table 1. pin descriptions pin number pin name description as1901/as1903 as1902 11g n d g r o u n d 2 - resetn active-low reset output. resetn rema ins low while v dd is below the reset threshold and for t tp after v dd rises above the reset threshold. resetn is open-drain on the as1903 and push-pull on the as1901. - 2 reset active-high reset output. reset remains high while v dd is below the reset threshold and for t tp after v dd rises above the reset threshold. 33v dd supply voltage. 3 1 2 top view as1901 as1902 as1903 sot23-3 v dd gnd resetn, reset ams ag technical content still valid
www.austriamicrosystems.co m revision 1.51 3 - 9 as1901, as1902, as1903 data sheet - absolute maximum ratings 5 absolute maximum ratings stresses beyond those listed in table 2 may cause perm anent damage to the device. these are stress ratings only, and functional operation of the device at these or any other conditions beyond t hose indicated in section 6 electrical characteristics is not implied. exposure to absolute maxi mum rating conditions for extended periods may affect device reliability. table 2. absolute maximum ratings ( t a = 25c unless otherwise noted) parameter limits unit notes v dd to gnd -0.3 to +5 v reset/resetn to gnd -0.3 to v dd + 0.3 v input current (v dd ) 20 ma output current (reset, resetn) 20 ma rate of rise (v dd ) 100 v/s operating temperature range (t a ) -40 to +85 c storage temperature range -65 to +150 c package-body peak temperature +260 c 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? ams ag technical content still valid
www.austriamicrosystems.co m revision 1.51 4 - 9 as1901, as1902, as1903 data sheet - electrical characteristics 6 electrical characteristics v dd = full range; t a = -40 to +85oc; unless otherwise specified notes: 1 see table 6, ?coding of factory-trimmed reset threshold voltages,? on page 6. 2 guaranteed by design. 3 see table 4, ?coding of factory-trimmed reset active time-out period,? on page 6. table 3. electrical characteristics parameter symbol conditions min typ max unit v dd range v dd t a = 0 to +70c 1.0 3.6 v t a = -40 to +85c 1.2 3.6 supply current (as1901/2/3) i dd v dd = 3.3v, no load 230 430 na reset threshold voltage 1 v th t a = +25c v th - 1.5% v th v th + 1.5% v t a = -40 to +85c v th - 2.5% v th v th + 2.5% v dd to reset delay 2 t rd v dd = v th to (v th - 100mv) 20 50 s reset active time-out period 3 t tp t tp - 40% t tp t tp + 60% ms resetn output voltage (as1901/3) v ol i sink = 1.2ma, v dd = 2.1v, reset asserted 0.4 v i sink = 400a, v dd = 1.2v, reset asserted 0.4 v resetn output voltage (as1901) v oh i source = 1.2ma, v dd = 3.2v 0.8 x v dd v reset output vo ltage (as1902) v oh i source = 500a, v dd = 2.1v, reset asserted 0.8 x v dd v i source = 100a, v dd = 1.2v, reset asserted 0.8 x v dd v v ol i sink = 1.2ma, v dd = 3.2v, reset not asserted 0.4 v reset threshold hysteresis v hyst 10 mv open-drain resetn output leakage current (as1903) i leak 0.1 a ams ag technical content still valid
www.austriamicrosystems.co m revision 1.51 5 - 9 as1901, as1902, as1903 data sheet - typical operating characteristics 7 typical operating characteristics figure 3. supply current vs. temperature figure 4. power down reset delay vs. temp. figure 5. power-up reset timeout vs. temperature figur e 6. max. trans. duration vs. reset th. overdrive 0 0.1 0.2 0.3 0.4 0.5 -40 -15 10 35 60 85 temperature(c) supply current (ma) . 0 25 50 75 100 125 150 175 200 -40 -15 10 35 60 85 temperature(c) reset delay (s) . v od = 10mv 0 25 50 75 100 125 150 175 200 -40 -15 10 35 60 85 temperature(c) power-up reset timeout (ms) . 0 25 50 75 100 125 150 175 200 1 10 100 1000 reset th. overdrive v th -v cc (mv) max. transient duration (s) . ams ag technical content still valid
www.austriamicrosystems.co m revision 1.51 6 - 9 as1901, as1902, as1903 data sheet - detailed description 8 detailed description interfacing to microprocessors wi th bi-directional reset pins the device has an open drain resetn out put, which enables easy interfacing to microprocessors (p) with bi-direc- tional reset pins, such as the motorola 68hc11. the resetn pin of the microcontroller ( c) can be connected directly to the p supervisor's resetn output with a singl e pull-up resistor (see figure 1 on page 1). negative-going v dd transients the device is optimized to ignore short-duration, negative-going v dd transients (glitches) in order to avoid incorrect resets. in the graph maximum transient duration vs. reset threshol d overdrive (page 6), the conditions are shown, for which the reset pulses are not generated. in the gr aph the maximum pulse width that a negative v dd transient may have when a reset signal is generated. as the amplitude of th e transient increases, the maximum allowable pulse width decreases. options table 4. coding of factory-trim med reset active time-out period device suffix t tp in milliseconds 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 5. output variants device output functionality as1901xxx activ e low (resetn) as1902xxx active high (reset) as1903xxx open drain (resetn) table 6. coding of factory-trimmed reset threshold voltages device suffix reset threshold voltage, v th in v t a = +25c t a = -40 to +85c min 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 ams ag technical content still valid
www.austriamicrosystems.co m revision 1.51 7 - 9 as1901, as1902, as1903 data sheet - pack age drawings and markings 9 package drawings and markings the device is available in a 3-pin sot-23 package. figure 7. 3-pin sot-23 package. ams ag technical content still valid
www.austriamicrosystems.co m revision 1.51 8 - 9 as1901, as1902, as1903 data sheet - ordering information 10 ordering information the device is available in the following standard versions. non-standard versions require a minimum order of 30,000 uni ts. contact austriamicrosystems for availability of non- standard versions. standard part threshold duration marking as1901c23 2.32 100ms asba AS1901C26 2.63 100ms asbd as1901c31 3.08 100ms asbi as1902c23 2.32 100ms asbk as1902c26 2.63 100ms asbn as1902c31 3.08 100ms asbs as1903c23 2.32 100ms asbu as1903c26 2.63 100ms asbx as1903c31 3.08 100ms asb3 ams ag technical content still valid
www.austriamicrosystems.co m revision 1.51 9 - 9 as1901, as1902, as1903 data sheet copyrights copyright ? 1997-200 7, austriamicrosystems ag, schloss premstaett en, 8141 unterpremstae tten, austria-europe. trademarks registered ?. all rights reserved. the materi al herein may not be reproduced, adapted, merged, trans- lated, stored, or used witho ut 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 t he warranty and patent indemni fication 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. austriami- crosystems ag reserves the right to change specifications and prices at any ti me 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 a pplications. applications requiring extended temperature range, unusual environmental requirements, or high reliability app lications, such as military, medical life-support or life- sustaining equipment are specifically not recommended wit hout additional processing by austriamicrosystems ag for each application. for shipments of less than 100 parts the m anufacturing flow might show deviations from the standard production flow, such as test flow or test location. 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 ar ising out of the furnishing, performance or use of the tech- nical 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 for sales offices, distributors and representatives, please visit: http://www.austriamicrosystems.com/contact ams ag technical content still valid
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