as1904, as1905, as1906 ultra low-power p supervisory circuit data sheet www.austriamicrosystems.co m revision 1.41 1 - 9 1 general description 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. the device exhibits excellent reliability and can reduce application costs by eliminati ng all external components. the device is available wit h different output drivers: ! 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 co nsumption 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. figure 1. functional block diagrams 2 key features ! 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 - as1904 push-pull resetn - as1905 push-pull reset - as1906 open drain resetn ! 4 time-out periods ranging from 5 to 500ms ! detection voltage accuracy: 1.5% ! temperature range: -40 to +85c ! sot23-3 package ! superior upgrade to austriamicrosystems as1901/2/3 device family 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 as1906 microprocessor v dd gnd gnd resetn reset i/o v cc 1 2 3 v cc as1904 as1905 microprocessor v dd gnd gnd reset, resetn reset v cc 1 2 3 w o r l d ' s l o w e s t p o w e r c o n s u m p t io n !
www.austriamicrosystems.co m revision 1.41 2 - 9 as1904, as1905, as1906 data sheet - pinout 4 pinout pin assignments figure 2. pin assignments (top view) pin descriptions table 1. pin descriptions pin number pin name description as1904/as1906 as1905 11gnd ground 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 as1906 and push-pull on the as1904. - 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 as1904 as1905 as1906 sot23-3 v dd gnd resetn, reset
www.austriamicrosystems.co m revision 1.41 3 - 9 as1904, as1905, as1906 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 those indicated in the operational sec- tions of the specifications is not im plied. exposure to absolute maximum rating conditions for extended periods may affect device reliability. table 2. absolute maximum ratings ( t a = 25c unless otherwise noted) parameter limits units 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?
www.austriamicrosystems.co m revision 1.41 4 - 9 as1904, as1905, as1906 data sheet - electrical characteristics 6 electrical characteristics v dd = full range; t a = -40o to +85 c; 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 v supply current i dd v dd = 3.3v, no load 150 290 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 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 (as1904/as1906) 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 (as1904) v oh i source = 1.2ma, v dd = 3.2v 0.8 x v dd v reset output vo ltage (as1905) 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 (as1906) i leak 0.1 a
www.austriamicrosystems.co m revision 1.41 5 - 9 as1904, as1905, as1906 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. temperatur e figure 6. max. trans. duration vs. reset th. overdrive 0 25 50 75 100 125 150 175 200 -40 -15 10 35 60 85 temperature(c) reset delay (s) . v od = 10mv 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) power-up reset timeout (ms) . 0 25 50 75 100 125 150 175 200 225 250 275 300 1 10 100 1000 reset th. overdrive v th -v cc (mv) max. transient duration (s) .
www.austriamicrosystems.co m revision 1.41 6 - 9 as1904, as1905, as1906 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 vdd 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 gene rated. in the graph the maximum pulse width that a negative v dd transient may have when a reset signal is generated. as the amplitude of the 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 as1904xxx activ e low (resetn) as1905xxx active high (reset) as1906xxx 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
www.austriamicrosystems.co m revision 1.41 7 - 9 as1904, as1905, as1906 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.
www.austriamicrosystems.co m revision 1.41 8 - 9 as1904, as1905, as1906 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 (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
www.austriamicrosystems.co m revision 1.41 9 - 9 as1904, as1905, as1906 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 reprodu ced, 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 pa tent infringement. austriami- crosystems ag reserves the right to chang e 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
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