1 date: 11/29/04 sp730 microprocessor supervisory circuit ? copyright 2004 sipex corporation microprocessor supervisory circuit with pull up resistor sp730 description features holds microcontroller in reset reset microcontroller during power loss 4.375 and 3.075 voltage trip points active low reset pin internal pull-up resistor holds reset for 350ms (typical) reset valid down to v dd 1.0v 45 a typical operating current offered in a 3 pin sot-23 package ? the sp730 is a voltage supervisory device designed to keep a microcontroller in reset until the system voltage has reached the proper level and stabilized. it also operates as protection from brown-out conditions when the supply voltage drops below a safe operating level. the sp730 has an internal 5k pull-up resistor. the device has an active low reset pin and will assert the reset signal whenever the voltage on the v dd pin is below the trip-point voltage. the part is available in a small 3 pin sot-23 package. contact factory for other trip voltage options. typical application circuit v dd sp730 reset v dd microcontroller gnd mclr reset or bypass capacitor gnd v dd sp730 3 pin sot-23 reset v dd gnd applications portable electronic devices electrical power meter computer system board modem now available in lead free packaging preliminary
2 date: 11/29/04 sp730 microprocessor supervisory circuit ? copyright 2004 sipex corporation v dd ................................................................................................. 6.0v all inputs and outputs w.r.t. gnd ............................... -0.6 to v dd + 1.0v storage temperature .................................................. -65 c to +150 c ambient temperature with power applied.....................-65 c to +125 c esd protection on all pins ............................................................ 2kv these are stress ratings only and functional operation of the device at these ratings or any other above those indicated in the operation sections of the specifications below is not implied. exposure to absolute maximum rating conditions for extended periods of time may affect reliability. v dd = 1.0v - 5.5v ; -40 c to 85 c. the ? denotes the specifications which apply over the full operating temperature range, unless otherwise specified. absolute maximum ratings pin number pin name 3 pin sot-23 description 1 reset active low. this pin goes low whenever v dd falls below the reset threshold. 2v dd supply input. 3 gnd ground. pin description electrical characteristics r e t e m a r a pl o b m y s. n i m. p y t. x a ms t i n us n o i t i d n o c e g n a r e g a t l o v g n i t a r e p ov d d 0 . 15 . 5 ? v v d d t e s e r o t e u l a vv n i m d d 0 . 1 ? v t n e r r u c g n i t a r e p oi d d 5 40 6 ? a v d d ) d a o l o n ( v 5 . 5 = v d d t n i o p p i r tv p i r t 0 . 35 7 0 . 35 1 . 3 ? v 5 2 . 45 7 3 . 40 5 . 4 ? s i s e r e t s y h d l o h s e r h tv s y h 0 5 ? v m t u p t u o l e v e l w o l t e s e r e g a t l o v v l o 6 . 0 ? v i l o v , a m 5 . 8 = d d = v n i m p i r t t u p t u o l e v e l h g i h t e s e r e g a t l o v v h o v d d 7 . - ? v i h o v , a 0 5 = d d > v p i r tx a m r o t s i s e r p u l l u p5 ? ? k v d d e v i t c a n i t e s e r o t t c e t e dt u p r 0 5 10 5 30 0 7 ? s m v d d t e s e r o t t c e t e dt d p r 0 1 ? s v d d m o r f d e p m a r v x a m p i r t v ( + x a m p i r t v ( o t ) v m 0 5 2 - n i m p i r t ) v m 0 5 2
3 date: 11/29/04 sp730 microprocessor supervisory circuit ? copyright 2004 sipex corporation 5k ? internal pull up resistor delay circuit output driver bandgap reference v dd comparator reset functional diagram timing diagram figure 1: sp730 timing diagram reset v dd trpu v trip v oh v oh trpd
4 date: 11/29/04 sp730 microprocessor supervisory circuit ? copyright 2004 sipex corporation idd vs temperature 0 10 20 30 40 50 60 -40 -20 0 20 4 06080100 temperature ('c) operating current (ua) idd trpu vs temperature 100 200 300 400 500 600 700 -40 -20 0 20 40 60 80 100 temperature ('c) timeout period (ms) trpu typical performance characteristics
5 date: 11/29/04 sp730 microprocessor supervisory circuit ? copyright 2004 sipex corporation normalized vtrip vs temperature 0.9900 0.9920 0.9940 0.9960 0.9980 1.0000 1.0020 -40 -20 0 20 40 60 80 100 temperature ('c) normalized threshold vol vs iol 0 100 200 300 400 500 600 700 800 900 1000 1100 1200 0123.245678.591011121314151617181920 iol (ma) vol (mv) vdd=4.25v vdd=3.5v vdd=2.5v t emp = 25'c typical performance characteristics
6 date: 11/29/04 sp730 microprocessor supervisory circuit ? copyright 2004 sipex corporation 3 pin sot-23 a a2 a1 side view a a seating plane c c with plating base metal b e e1 e e1 d b 1 2 3 l1 l gauge plane view c see view c b b section b-b view a-a seating plane symbol min nom max a0 .89 - 1.12 a1 0.01 - 0.1 a2 0.88 0.95 1.02 b 0.3 - 0.5 c0 .08 - 0.2 d 2.8 2.9 3.04 e e1 e0 .95 - 2.64 e1 1.2 1.3 1.4 l 0.4 0.5 0.6 l1 ?0o-8o note: dimensions in (mm) 3 pin sot-23 jedec to-236 (ab) variation 0.95 bsc 1.90 bsc 0.54 ref
7 date: 11/29/04 sp730 microprocessor supervisory circuit ? copyright 2004 sipex corporation corporation analog excellence sipex corporation reserves the right to make changes to any products described herein. sipex does not assume any liability aris ing out of the application or use of any product or circuit described herein; neither does it convey any license under its patent rights nor t he rights of others. sipex corporation headquarters and sales office 233 south hillview drive milpitas, ca 95035 tel: (408) 934-7500 fax: (408) 935-7600 ordering information part number top mark temperature package sp730ek-4.375...............v3ww................-40 -85 ..............................3 pin sot-23 sp730ek-4.375/tr.........v3ww................-40 -85 ..............................3 pin sot-23 sp730ek-3.075...............m4ww................-40 -85 ..............................3 pin sot-23 sp730ek-3.075/tr.........m4ww................-40 -85 ..............................3 pin sot-23 contact factory for other trip voltage options. /tr = tape and reel pack quantity is 2500 for sot-23. available in lead free packaging. to order add "-l" suffix to part number. example: sp730ek-4.375/tr = standard; sp730ek-l-4.375/tr = lead free click here to order samples
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