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mic2790/1/3 supervisor with high - accuracy, ultra - fast propagation delay, and capacitor - programmable reset delay micrel inc. ? 2180 fortune drive ? san jose, ca 95131 ? usa ? tel +1 (408) 944 - 0800 ? fax + 1 (408) 474 - 1000 ? http://www.micrel.com august 23, 2013 revision 1.0 general description the mic2790/1/3 is ideal for monitoring highly - accurate core voltages that require rapid response in the event of a fault condition. the voltage supervisor ic features a manual reset input , enable input (mic2793 only), a capacitor - programmable reset timeout delay and both an active - low and active - high reset output . the mic2790/1/3 monitors system voltages that are in the range of 0.4v to 5.5v , with a typical se nse accuracy of 0.5 % at +25 c and 1 .0% across ? 40 c to +125 c . the ic asserts a reset output when the sense voltage drops below the threshold or when the ma nual reset is pulled to a logic low. the a ctive -l ow reset stays low for the duration of the reset timeout delay once the sense voltage returns to normal and the manual reset transitions to a logic high state. the reset timeout delay period is programmable from 1ms to 10s with an external capacitor. the mic2790/1/3 operate s from a low supply voltage of 1.5v to 5.5v, and is rated to operate over the temperature range of ? 40?c to +125?c . the mic2790 is available in a 6- pin tsot - 23 package or a 6- pin 2mm 2mm 0.55mm dfn package. the mic2791 is available in a tiny 6- pin 1.6mm 1.6mm 0.55mm dfn package. the mic2793 is available in a 8- pi n 2mm 2mm 0.55mm dfn package. datasheets and support documentation are available on micrel?s web site at: www.micrel.com . features ? 1.5v to 5.5v operating supply voltage range ? ultra - fast propagation delay (1s typically) ? 0.4v reference voltage (sns pin) ? 1.0% threshold accuracy from ? 40 c to +125 c ? monitored voltage range from 0.4v to 5.5v ? programmable r eset timeout delay ( from 1ms to 10s ) ? manual reset input with an internal pull - up resistor ? active -h igh e nable input pin (mic2793 only) ? the mic2790/1 /3 feature s multiple output options : ? open -d rain a ctive -l ow (/reset) ? push - pu ll a ctive -l ow (/reset) ? push -p ull a ctive -h igh (reset) ? ? 40c to 125c junction temperature range ? 6- pin tsot - 23 (mic2790) ? 6- pin 2mm 2mm thin dfn (mic2790) ? 6- pin 1 .6mm 1.6mm thin dfn (mic2791) ? 8- pin 2mm 2mm thin dfn (mic2793) applications ? telecom ? computer/servers ? medical equipment ? portable ? set - top boxes ? critical microprocessor monitoring typical application
micrel, inc. mic2790/1/3 august 23, 2013 2 revision 1.0 ordering information part number marking code threshold voltage ( sns ) ( 1 ) /reset output (active - l ow) reset output (active - h igh) enable pin feature junction temperature range package ( 2 , 3 ) mic2790n - 04vd6 9nd 0.4v open - drain ? ? ? 40c to +125c 6 - pin tsot - 23 mic2790l - 04vd6 9ld 0.4v push - pull ? ? ? 40c to +125c 6 - pin tsot - 23 mic2790h - 04vd6 9ha 0.4v ? push - pull ? ? 40c to +125c 6 - pin tsot - 23 mic2790n - 04vmt 9na 0.4v open - drain ? ? ? 40c to +125c 6 - pin 2mm 2mm tdfn mic2791n - 04vmt 1n 0.4v open - drain ? ? ? 40c to +125c 6 - pin 1.6mm 1.6mm tdfn mic2791l - 04vmt 1l 0.4v push - pull ? ? ? 40c to +125c 6 - pin 1.6mm 1.6mm tdfn mic2791h - 04vmt xh 0.4v ? push - pull ? ? 40c to +125c 6 - pin 1.6mm 1.6mm tdfn mic2793lh - 04vmt 3lh 0.4v push - pull push - pull yes ? 40c to +125c 8 - pin 2mm 2mm tdfn mic2793nh - 04vmt 3nh 0.4v open - drain push - pull yes ? 40c to +125c 8 - pin 2mm 2mm tdfn note s : 1. other voltage options are available. contact micrel for details. 2. thin dfn pin 1 identifier = ? ? . 3. thin dfn is a green rohs compliant package. lead finish is nipdau. mold compound is halogen free. pin configuration 6 - pin tsot (d6) (top view) 6 - pin 1.6mm x 1.6mm tdfn (mt) (top view) 6 - pin 2mm x 2mm tdfn (mt) (top view) 8 - pin 2mm x 2mm tdfn (mt ) (top view) reset (/ reset ) 1 2 3 6 5 4 gnd / mr c th sns vdd vdd ep 1 2 3 6 5 4 sns c th / mr gnd reset (/ reset ) vdd ep 1 2 3 6 5 4 sns c th /mr gnd reset (/reset) en ep 1 2 3 4 8 7 6 5 vdd sns c th /mr gnd /reset reset
micrel, inc. mic2790/1/3 august 23, 2013 3 revision 1.0 pin description pin n umber t sot -23 (6l) pin number 1.6 1.6 (6l) pin number 2 2 (6l) pin number 2 2 (8l) pin name pin function 1 6 6 7 /reset /reset is an a ctive -l ow output pin and is available in an open - drain or push - pull configuration . in the open - drain configuration, a pull - up resistor to v dd is required and /reset pin is asserted low when /mr is set to a logic low or the sns voltage decreas es below the threshold voltage. /reset will remain low for the reset timeout delay after sns > (v th + v hyst ) and /mr is set to a logic h igh. the push - pull configuration does not require a pull - up resistor and behaves exact ly the same as the open - drain configuration. 1 6 6 8 reset reset is a n a ctive -h igh push - pull output and is asserted high when /mr is set to a logic low or the sns voltage decreases below the threshold voltage. reset will remain high for the reset timeout delay after sns > (v th + v hyst ) a nd /mr is set to a logic h igh. 2 5 5 6 gnd supply ground. 3 4 4 5 /mr manual r eset is an a ctive -l ow input logic level pin and is internally pulled to vdd through a 90 k ? pull - up resistor. pulling the /mr input to a logic low asserts reset and / reset pins . /reset will remain low and reset will remain high for the reset time out delay after /mr is pulled to logic high. 4 3 3 4 c th programmable t imeout d elay. connect a capacitor to ground to set a user defined reset delay time. 5 2 2 3 sns voltage monitor input. connect sense pin to the v oltage to be monitored through a resistor divider. when this voltage decreases below the threshold voltage, v th , /reset is asserted low and reset is asserted high. 6 1 1 2 vdd supply voltage pin . bypass wit h a 1 f capacitor from this pin to gnd . ? ? ? 1 en enable input function is only available in the mic2793 version. this pin enables the /mr input function and reset and /reset outputs. when en is in a logic low state, the reset outputs are de - asserted. the en pin has a n internal 90 k ? pull - up resistor to vdd. ? ep ep ep e pad exposed pad . connect to ground plane.
micrel, inc. mic2790/1/3 august 23, 2013 4 revision 1.0 absolute maximum ratings ( 4 ) supply voltage ( v dd ) .................................... ? 0.3v to +6.0v sns ................................................................ ? 0.3v to 4.5v /mr, en, c th .................................................... ? 0.3v to v dd reset, / reset .............................................. ? 0.3v to v dd lead temperature (soldering, 10 s) ............................ 260c storage temperature (t s ) ......................... ? 55c to +150c es d ratings (6) ............................................... esd sensitive operating ratings ( 5 ) supply v oltage ( v dd ) .................................... + 1.5 v to + 5.5 v sns ..................................................................... 0v to 4.0v /mr, en, c th ......................................................... 0v to v dd reset, / reset ................................................... 0v to v dd junction temperature (t j ) ........................ ? 40 c to +125 c junction thermal resistance 6 - pin, t sot - 23 ( ja ) ..................................... 177.2 c/w 6 - pin, 1.6mm 1.6mm tdfn ( ja ) ................. 92.4c/w 6 - pin, 2mm 2mm tdfn ( ja ) .......................... 90c/w 8 - pin, 2mm 2mm tdfn ( ja ) .......................... 90c/w electrical characteristics ( 7 ) v dd = 3.3v ; r / reset = 100 k ? ; c th = 1nf; t a = 25c, bold values indicate ? 40 c t a +125 c, unless noted. symbol parameter condition min . typ . max . units supply specifications v dd supply v oltage /reset output valid 1.5 5.5 v i dd supply c urrent v dd = en = /mr = 3.3v reset and / reset not asserted 40 70 a v dd = en = /mr = 5v reset and / reset not asserted 50 80 sense specifications v th sense threshold voltage 0.4 v sense threshold accuracy ? 1.0 +1.0 % v hyst hysteresis sense rising ? 2.5 1.5 +2.5 % i sns sense input bias c urrent ? 15 +15 na reset & / reset output specifications t p,sns sns to reset and / reset propagation d elay ( 8 ) sns = v th 1.05 to v th 0.95 1 2 .2 s v o l /reset logic low output voltage i ol = 1ma (open - drain only) 0.3 v v o h reset logic high output voltage i oh 1ma (push - pull only) >0.9 v dd v i oh /reset l eakage c urrent /reset n ot a sserted (open - drain only) 1 a t d reset and / reset timeout delay c th = 100pf 0. 4 5 1.05 1. 8 ms c th = 180nf 0. 5 1.2 1. 9 s notes: 4. exceeding the absolute maximum ratings may damage the device. 5. the device is not guaranteed to function outside its operating ratings. 6. devices are esd sensitive. handling precautions are recommended. human body model, 1.5k ? in series with 100pf. 7. specification for packaged product only. 8. sns to reset and or / reset propagat ion delay is the delay time for sns voltage to transition from v th 1.05 to v th 0.95 to reset and or / reset.
micrel, inc. mic2790/1/3 august 23, 2013 5 revision 1.0 electrical characteristics ( 7 ) (continued) v dd = 3.3v; r / reset = 100 k ? ; c th = 1nf; t a = 25c, bold values indicate ? 40 c t a +125 c, unless noted. symbol parameter condition min . typ . max . units /mr input specifications r /mr /mr internal pull - up r esistance 90 k? t p,/mr /mr to reset and / reset propagation d elay 100 ns v il /mr logic low input v oltage 0.5 v v ih /mr l ogic high input v oltage 1.2 v en input specifications (mic2793 only) r en en internal pull - up r esistance 90 k? t p,en en to reset and /reset propagation d elay /mr = logic low 100 ns v enl en logic low input v oltage 0.5 v v en h en logic high input v oltage 1.2 v
micrel, inc. mic2790/1/3 august 23, 2013 6 revision 1.0 typical characteristics 10 20 30 40 50 60 70 80 1 2 3 4 5 6 supply current (a) supply voltage (v) supply current vs. supply voltage reset not asserted - 40 c 25 c 85 c reset not asserted 125 c 0.4 0.6 0.8 1 1.2 1.4 1 2 3 4 5 6 reset timeout delay (ms) supply voltage (v) reset timeout delay vs. supply voltage c th = 100pf 0.4 0.6 0.8 1 1.2 1.4 1.6 1 2 3 4 5 6 reset timeout delay (s) supply voltage (v) reset timeout delay vs. supply voltage c th = 180nf 0.1 1 10 100 1000 10000 100000 0.01 0.1 1 10 100 1000 10000 reset timeout delay (ms) cth (nf) reset timeout delay vs. c th v dd = 3.3v 0.5 0.6 0.7 0.8 0.9 1 1.1 1.2 1.3 1.4 1.5 1.6 1.7 -40 -20 0 20 40 60 80 100 120 reset timeout delay (ms) temperature ( c) reset timeout delay vs. temperature v dd = 3.3v c th = 100pf 0.6 0.7 0.8 0.9 1 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 -40 -20 0 20 40 60 80 100 120 reset timeout delay (s) temperature ( c) reset timeout delay vs. temperature v dd = 3.3v c th = 180nf -1.0% -0.8% -0.6% -0.4% -0.2% 0.0% 0.2% 0.4% 0.6% 0.8% 1.0% 1 2 3 4 5 6 normalized sns threshold (%) supply voltage (v) normalized sns threshold vs. supply voltage sns falling sns rising -1.0% -0.8% -0.6% -0.4% -0.2% 0.0% 0.2% 0.4% 0.6% 0.8% 1.0% -40 -20 0 20 40 60 80 100 120 normalized sns threshold (%) temperature ( c) normalized sns threshold vs. temperature sns rising sns falling v dd = 3.3v 100 150 200 250 300 350 400 1 2 3 4 5 6 cth charging current (na) supply voltage (v) c th charging current vs. supply voltage
micrel, inc. mic2790/1/3 august 23, 2013 7 revision 1.0 typical characteristics (continued) 0 1 2 3 4 5 6 7 8 0 50 100 150 200 sns to reset prop delay (s) overdrive voltage (mv) sns to reset propagation delay vs. overdrive voltage v dd = 3.3v
micrel, inc. mic2790/1/3 august 23, 2013 8 revision 1.0 timing diagrams figure 1 . timeout and propagation d elay from sense to reset and /reset figure 2 . timeout and propagation d elay from /mr to reset and /reset
micrel, inc. mic2790/1/3 august 23, 2013 9 revision 1.0 timing diagrams (continued) figure 3 . hold and propagation d elay from en to reset and /reset
micrel, inc. mic2790/1/3 august 23, 2013 10 revision 1.0 functional diagram figure 4 . simplified mic279 3 functional block diagram
micrel, inc. mic2790/1/3 august 23, 2013 11 revision 1.0 functional description design and product advantages the mic2790/1/3 is a high ly - accurate supervisor circuit with an ultra - fast propagation delay of 2 .2 s ( max imum) over the temperature range of ? 40?c to +125?c . additi onal f eatures in the mic2790/1/3 include a manual reset input pin, a capacitor - pr ogrammable reset timeout delay and both an active - low and active - high reset output. the capacitor - programmable reset delay help protect against accidental system glitch during a reset timeout . vdd the input supply ( v dd ) provides power to the comparators and logic timer s . v dd operating range is 1.5 v to 5.5v . a ceramic input capacitor of 1f with a minimum voltage rating of 6.3v is recommended between v dd and gnd . refer to pcb layout recommendations for details. en the e nable (en) pin feature is only available in the mic2793 option and has an internal pull - up of 90 k ? resistor to v dd . a logic high signal on en pin enables the reset logic outputs, while a logic low signal disables the reset output s . see figure 3 in the timing diagrams section for more information. c th c th is a programmable timeout delay pin. connect a capacitor to ground to set a reset timeout delay ranging from 1ms to 10s . refer to the reset timeout delay vs. c th plot in the typical characteristics section for examples . sns the sense (sns) i nput pin monitors the user?s voltage through a resistor divider network as shown in figure 5 . figure 5 . resistor d ivider on sns pin to set r top and r bottom , use equation 1 and set an arbitrary r top value greater than 100 k ? and solve for r bottom or vice versa. ? ? ? ? ? ? + = bottom top monitor r r 1 0.4v v eq. 1 gnd the ground (gnd) pin is the return path for v dd , logic gates, and output pins . refer to pcb layout recommendations for details. / mr manual reset (/mr) is an active - low input pin that is internally pulled to v dd with a 90k ? resistor . when /mr is asserted to a logic - low level, /reset will transition to a logic low state while reset will transition to a logic high state . see the timing diagrams section for more information . / reset /reset is an active - low output and is available in two output configurations : open - drain or push - pull. the open - drain configuration requires an external pull - up resistor , while the push - pull does not . /reset is asserted low when /mr is set to a logic - low or the sns voltage decreases below the threshold voltage. /reset will remain low for the programmed reset t ime out delay after sns > (v th + v hyst ) and /mr is set to a logic - high , and then /reset will transition high to indicate normal regulation. see the timing diagrams section for more information . reset reset is an active - high push - pull output and is asse rted high when /mr is set to a logic low or the sns voltage decreases below the threshold voltage. reset will remain high for the programmed reset timeout delay after sns > (v th + v hyst ) and /mr is set to a logic high, and then reset will transition low to indicate normal regulation. see the timing diagrams section for more information . sns = 0 . 4 v r top r bottom v monitor
micrel, inc. mic2790/1/3 august 23, 2013 12 revision 1.0 typical application schematic bill of materials item part number manufacturer description qty. c1 06036d225kat2a avx ( 9 ) 2.2f, 6.3v, x5r, 0603 1 grm188r60j225ke19d murata ( 10) c1608x5r0j225kt tdk ( 11) c2 01016d102kat2a avx 1n f, 6.3v, x5r, 0603 1 grm155r60j102ka01d murata c0402x5r0j102k020bc tdk r1 crcw0603 50 k0fkea vishay/dale ( 12 ) 50k ?, 1%, 1/10w, 0603 1 r2 crcw060328k7fkea vishay/dale 28.7 k ?, 1%, 1/10w, 0603 1 r3 crcw060313k7fkea vishay/dale 13.7 k ?, 1%, 1/10w, 0603 1 r5, r6 crcw06031003fkea vishay/dale 100k ?, 1%, 1/10w, 0603 2 u1 mic2793nh - 04vmt micrel, inc . ( 13) supervisor with high - accuracy, ultra - fast propagation delay, and capacitor - programmable reset delay 1 notes: 9. avx: www.avx.com . 10. murata: www.murata.com . 11. tdk: www.tdk.com . 12. vishay: www.vishay.com . 13. micrel, inc.: www.micrel.com .
micrel, inc. mic2790/1/3 august 23, 2013 13 revision 1.0 pcb layout recommendations top layer bottom layer
micrel, inc. mic2790/1/3 august 23, 2013 14 revision 1.0 package information ( 14) and recommended land pattern ( tsot- 23 - 6l ) 6 -p in t sot -23 (d 6 ) note: 14. package information is correct as of the publication date. for updates and most current information, go to www.micrel.com .
micrel, inc. mic2790/1/3 august 23, 2013 15 revision 1.0 package information ( 14) and recommended land pattern (1.6mm 1.6mm tdfn-6l) 6 -p in 1.6mm 1.6mm tdfn (mt)
micrel, inc. mic2790/1/3 august 23, 2013 16 revision 1.0 package information ( 14) and recommended land pattern ( 2mm 2mm tdfn - 6 l) 6 -p in 2mm 2mm tdfn (mt)
micrel, inc. mic2790/1/3 august 23, 2013 17 revision 1.0 package information ( 14) and recommended land pattern (2mm 2mm tdfn - 8 l) 8 -p in 2mm 2mm tdfn (mt)
micrel, inc. mic2790/1/3 august 23, 2013 18 revision 1.0 micrel, inc. 2180 fortune drive san jose, ca 95131 usa tel +1 (408) 944 - 0800 fax +1 (408) 474- 1000 web http://www.micrel.com micrel makes no representations or warranties with respect to the accuracy or completeness of the information furnished in this data sheet. this information is not intended as a warranty and micrel does not assume responsibility for its use. micrel reserves the right to change circuitry, specifications and descriptions at any time without notice. no license, whe ther express, implied, arising by estoppel or otherwise, to any intellectual property rights is granted by this document. except as provided in micrel?s terms and conditions of sale for such products, micrel assumes no liability whatsoever, and micrel disclaims any express or implied warranty relating to the sale and/or use of micrel products including liability or warranties relating to fitness for a particular purpose, merchantability, or infringement of any patent, copyright or other intellectual proper ty right . micrel products are not designed or authorized for use as components in life support appliances, devices or systems where malfunction of a product can reasonably be expected to result in personal injury. life support devices or systems are devices or systems that (a) are intended for surgical implant into the body or (b) support or sustain life, and whose failure to perform can be reasonably expected to result in a significant injury to the user. a purchaser?s use or sale of micrel products for u se in life support appliances, devices or systems is a purchaser?s own risk and purchaser agrees to fully indemnify micrel for any damages resulting from such use or sale. ? 2013 micrel, incorporated.

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