low voltage, high accuracy, quad voltage p supervisory circuit preliminary technical data adm6710 rev. prb information furnished by analog devices is believed to be accurate and reliable. however, no responsibility is assumed by analog devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. specifications subject to change without notice. no license is granted by implication or otherwise under any patent or patent rights of analog devices. trademarks and registered trademarks are the property of their respective owners. one technology way, p.o. box 9106, norwood, ma 02062-9106, u.s.a. tel: 781.329.4700 www.analog.com fax: 781.461.3113 ?2007 analog devices, inc. all rights reserved. features accurate monitoring of up to four power supply voltages 5 reset threshold options: 1.8 v to 5 v monitors down to 0.62 v (1.5% accuracy) 200 ms typical reset timeout open-drain reset output (10 a internal pull-up) reset output stage: active low, valid to in 1 = 1 v or in 2 = 1 v low power consumption (35 a) power supply glitch immunity specified from ?40o c to +85 oc 6-lead sot-23 package applications microprocessor systems desktop and notebook computers controllers data storage equipment servers/workstations functional block diagram 200ms timeout uvlo in 2 , v cc 0.62v ref adm6710 reset in 1 in 2 , v cc in 3 in 4 06626-001 figure 1. general description the adm6710 is a low voltage, high accuracy supervisory circuit. this device monitors up to four system supply voltages. if a monitored power supply voltage falls below the minimum voltage threshold, a single active low output asserts, triggering a system reset. the output is open drain with a weak internal pull-up to the monitored in 2 supply (or to v cc in the case of the adm67109q) of typically 10 a. once all voltages rise above the selected threshold level, the reset signal remains low for the reset timeout period (200 ms typical). the adm6710 output remains valid as long as in 1 or in 2 exceeds 1v, while for the adm6710q the output remains valid as long as v cc exceeds 2 v. the adm6710 incorporates a variety of internally pretrimmed undervoltage threshold options for monitoring 5.0 v, 3.3 v, 3.0 v, 2.5 v and 1.8 v supply voltages. the device offers up to three adjustable thresholds for monitoring voltages down to 0.62 v. the adm6710 is available in a 6-lead sot-23 package and is suitable for use in a variety of voltage monitoring applications.
adm6710 preliminary technical data rev. prb | page 2 of 8 table of contents features .............................................................................................. 1 applications....................................................................................... 1 functional block diagram .............................................................. 1 general description ......................................................................... 1 specifications..................................................................................... 3 absolute maximum ratings............................................................. 4 esd caution.................................................................................. 4 pin configuration and function descriptions............................. 5 theory of operation .........................................................................6 input configuration......................................................................6 reset output configuration ........................................................6 addition of manual reset ...........................................................7 outline dimensions ..........................................................................8 ordering guide .............................................................................8
preliminary technical data adm6710 rev. prb | page 3 of 8 specifications v in2 = 1 v to 5.5 v, t a = ?40oc to 85oc, unless otherwise stated. typical values are v in2 =3.0 v to 3.3 v, t a = +25oc. table 1. parameter min typ max units test conditions v cc operating voltage range 1 2.0 5.5 v adm6710q only v in2 operating voltage range 2 1.0 5.5 v all devices except adm6710q; t a = 0oc to +85oc 1.2 5.5 v all devices except adm6710q; t a = ?40oc to +85oc in x , input current 25 40 a in x = nominal input voltage (for 1.8 v, 2.5 v and 5.0 v supplies) 55 115 a in 2 = nominal input voltage (for 3.0 v and 3.3 v supplies). the supply splits into 25 a for the resistor divider and 30 a for other circuits. 0.4 a v in1 = 0 to 0.85 v (for adjustable thresholds) 0.2 a v in3 , v in4 = 0 to .85 v (for adjustable thresholds) i cc input current 35 50 adm6710q only; v cc = 5.5 v threshold voltage (v th ) 4.50 4.63 4.75 v in x decreasing; 5 v (?5%) 4.25 4.38 4.50 v in x decreasing; 5 v (?10%) 3.00 3.08 3.15 v in x decreasing; 3.3 v (?5%) 2.85 2.93 3.00 v in x decreasing; 3.3 v (?10%) 2.70 2.78 2.85 v in x decreasing; 3.0 v (?5%) 2.55 2.63 2.70 v in x decreasing; 3.0 v (?10%) 2.25 2.32 2.38 v in x decreasing; 2.5 v (?5%) 2.13 2.19 2.25 v in x decreasing; 2.5 v (?10%) 1.62 1.67 1.71 v in x decreasing; 1.8 v (?5%) 1.53 1.58 1.62 v in x decreasing; 1.8 v (?10%) adjustable threshold (v th ) 0.611 0.620 0.629 v in x decreasing reset threshold hysteresis (v hyst ) 0.3 %v th in x increasing relative to in x decreasing reset threshold temperature coefficient (tcv th ) 60 ppm/c in x to reset delay (t rp ) 30 s v in falling at 10 mv/s from v th to v th ? 50 mv reset timeout period (t rp ) 140 200 280 ms reset output low (v ol ) 0.3 v v in2 , v cc = 5 v, i sink = 2 ma 0.4 v v in2 , v cc = 2.5 v, i sink = 1.2 ma 0.3 v v in2 = 1.0 , i sink = 50 a, t a = 0 oc to +85 oc reset output high (v oh ) 0.8 v cc v v cc 2.0 v, i source =6 a, reset deasserted (adm6710q only) 0.8 v cc v v in2 2.0 v, i source =6 a, reset deasserted reset output high source current (i oh ) 10 a v in2 2.0 v, reset deasserted 1 note that the adm6710q is powered from v cc . 2 the reset output is guaranteed to be in the correct state for in 1 or in 2 down to 1 v.
adm6710 preliminary technical data rev. prb | page 4 of 8 absolute maximum ratings table 2. parameter rating v cc , in x , reset to gnd ?0.3 v to +6 v continuous reset current 20 ma continuous power dissipation 450 mw storage temperature range ?65c to +125c operating temperature range ?40c to +85c lead temperature (10 sec) 300c junction temperature 150c stresses above those listed under absolute maximum ratings may cause permanent damage to the device. this is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operational section of this specification is not implied. exposure to absolute maximum rating conditions for extended periods may affect device reliability. esd caution
preliminary technical data adm6710 rev. prb | page 5 of 8 pin configuration and fu nction descriptions in 1 1 in 2 2 in 3 3 reset 6 gnd 5 in 4 4 adm6710 top view (not to scale) 06626-002 in 1 1 v cc 2 in 3 3 reset 6 gnd 5 in 4 4 adm6710q top view (not to scale) 06626-003 figure 2. table 3. pin function descriptions pin no. mneumonic description 1 in 1 input voltage 1. in 2 input voltage 2. in 2 is the power supply input for the adm6710. 2 v cc v cc is the power supply input for the ad m6710q. it is not a monitored input. 3 in 3 input voltage 3. 4 in 4 input voltage 4. 5 gnd ground. 6 reset reset goes low when an input drops below the specified threshold. once all inputs rise above the threshold voltage, reset remains low for 200 ms (typical) before going high. the reset output is open drain with a weak internal pull-up to in 2 or, in the case of the adm6710q to v cc , typically 10 a.
adm6710 preliminary technical data rev. prb | page 6 of 8 theory of operation the adm6710 is a compact, low power supervisory circuit capable of monitoring up to four voltages in multivoltage applications. if a monitored power supply voltage falls below the minimum voltage threshold, a single active low output asserts, triggering a system reset. the adm6710 includes several voltage threshold options for monitoring 5.0 v, 3.3 v, 3.0 v, 2.5 v and 1.8 v supplies. it also provides up to three adjustable thresholds for monitoring voltages down to 0.62 v. see the ordering guide section for a list and description of all options available. the adm6710 includes precision comparators, an accurate band gap reference, and a series of internally-trimmed resistor divider networks to set the factory-fixed reset threshold options. the resistor networks scale the specified inx reset voltages to match the internal band gap reference/comparator voltage. adjustable threshold options bypass the internal resistor networks and connect directly to one of the comparator inputs. external resistor divider networks must be used to scale voltages down for monitoring at the adjustable inputs. the adm6710q provides a separate unmonitored power supply input (v cc ) and three adjustable voltage inputs. the internal comparators each typically have a hysteresis of 0.3% with respect to its reset threshold. this built-in hysteresis improves the devices immunity to ambient noise without noticeably reducing the threshold accuracy. the adm6710 is unaffected by short input transients. monitored supplies microprocessor 06626-004 adm6710 in 1 in 2 in 3 in 4 gnd reset figure 3. typical applications circuit input configuration the adm6710 provides numerous monitor choices with adjustable reset thresholds. typically, the threshold voltage at each adjustable inx input is 0.62 v. to monitor a voltage greater than 0.62 v, connect a resistor divider network to the circuit as depicted in figure 4, where ? ? ? ? ? ? ? ? + = 2 2 1 62 . 0 r r r v v inth r1 r2 v inth v ref = 0.62v 06626-006 figure 4. setting the adjustable monitor the adm6710q contains an internal voltage clamp at each of the adjustable voltage inputs. input voltages greater than 1.5 v induce a higher input current. the adm6710 is normally powered from the monitored in 2 , or v cc in the case of the adm6710q. monitored inputs are resistant to short power supply glitches. to increase noise immunity in noisy applications, place a 0.1 f capacitor between the in 2 input and ground. adding capacitance to in 1 , in 3 , and in 4 also improves noise immunity. do not allow unused monitor inputs to float or to be grounded. connect these inputs to a supply voltage greater than their specified threshold voltages. in the case of unused inx adjustable inputs, limit the bias current by connecting a 1 m series resistor between the unused input and in 2 (or v cc with the adm6710q). reset output configuration the adm6710 has a reset timeout period of 200 ms (typical). the output is open drain with a weak internal pull-up to the monitored in 2 or v cc supply, typically 10 ua. in many applications that interface with other logic devices, there is no requirement for an external pull-up resistor. an external pull-up resistor to any voltage, ranging from 0 v to 5.5 v, can overdrive the internal pull-up when interfacing to different logic supply voltages (see figure 5). reverse current flow from the external pull-up voltage to in 2 is prevented by the internal circuitry. adm6710 reset 06626-005 reset v cc 5 v 100k ? in 2 =3.3 v figure 5. interface with a different logic supply voltage the adm6710q is powered by v cc , which is not a monitored voltage. all other adm6710 options are powered by in 2 , which is a monitored voltage. if a supply voltage drops below its associated threshold, the reset output asserts low and remains low while either in 1 or in 2 remains above 1.0 v.
preliminary technical data adm6710 addition of manual reset adm6710 in 1 in 2 in 3 in 4 gnd reset 06626-007 r1 r2 v in4 figure 6. addition of manual reset (in 4 is an adjustable input). use the circuit shown in figure 6 to add a manual reset to the adm6710. when the switch is closed, the analog input shorts to ground and a reset output commences. the switch must remain open for a minimum of 140 ms for the reset output to deassert.
adm6710 preliminary technical data rev. prb | page 8 of 8 outline dimensions 1 3 4 5 2 6 2.90 bsc 1.60 bsc 2.80 bsc 1.90 bsc 0.95 bsc 0.22 0.08 10 4 0 0.50 0.30 0.15 max 1.30 1.15 0.90 seating plane 1.45 max 0.60 0.45 0.30 pin 1 indicator compliant to jedec standards mo-178-ab figure 7. 6-lead small outline transistor package [sot-23] (rj-6) dimensions shown in millimeters ordering guide nominal input voltage model in1 in2 in3 in4 supply tolerance (%) temperature range package description package option branding ADM6710AARJZ-REEL7 1 5 3.3 2.5 adj. 2 10 ?40c to +85c 6-lead sot-23 rj-6 ma9 adm6710barjz-reel7 1 5 3.3 2.5 adj. 2 5 ?40c to +85c 6-lead sot-23 rj-6 mah adm6710carjz-reel7 1 5 3.3 1.8 adj. 2 10 ?40c to +85c 6-lead sot-23 rj-6 maj adm6710darjz-reel7 1 5 3.3 1.8 adj. 2 5 ?40c to +85c 6-lead sot-23 rj-6 mak adm6710earjz-reel7 1 adj. 2 3.3 2.5 1.8 10 ?40c to +85c 6-lead sot-23 rj-6 max adm6710farjz-reel7 1 adj. 2 3.3 2.5 1.8 5 ?40c to +85c 6-lead sot-23 rj-6 ma4 adm6710garjz-reel7 1 5 3.3 adj. 2 adj. 2 10 ?40c to +85c 6-lead sot-23 rj-6 mal adm6710harjz-reel7 1 5 3.3 adj. 2 adj. 2 5 ?40c to +85c 6-lead sot-23 rj-6 mam adm6710iarjz-reel7 1 adj. 2 3.3 2.5 adj. 2 10 ?40c to +85c 6-lead sot-23 rj-6 man adm6710jarjz-reel7 1 adj. 2 3.3 2.5 adj. 2 5 ?40c to +85c 6-lead sot-23 rj-6 map adm6710karjz-reel7 1 adj. 2 3.3 1.8 adj. 2 10 ?40c to +85c 6-lead sot-23 rj-6 maq adm6710larjz-reel7 1 adj. 2 3.3 1.8 adj. 2 5 ?40c to +85c 6-lead sot-23 rj-6 mar adm6710marjz-reel7 1 adj. 2 3 2.5 adj. 2 10 ?40c to +85c 6-lead sot-23 rj-6 mas adm6710narjz-reel7 1 adj. 2 3 2.5 adj. 2 5 ?40c to +85c 6-lead sot-23 rj-6 mat adm6710oarjz-reel7 1 adj. 2 3 1.8 adj. 2 10 ?40c to +85c 6-lead sot-23 rj-6 mau adm6710parjz-reel7 1 adj. 2 3 1.8 adj. 2 5 ?40c to +85c 6-lead sot-23 rj-6 mav adm6710qarjz-reel7 1 adj. 2 v cc adj. 2 adj. 2 n/a ?40c to +85c 6-lead sot-23 rj-6 maw 1 z = rohs compliant part. 2 adjustable voltage based on 0.62 v internal threshold. the external threshold voltage can be set using an external resistor di vider. ?2007 analog devices, inc. all rights reserved. trademarks and registered trademarks are the prop erty of their respective owners. pr 06626-0-3/07(prb)
|
