? semiconductor components industries, llc, 2010 november, 2010 ? rev. 2 1 publication order number: cat8710/d cat8710 quad voltage supervisor the cat8710 is a space-saving, precision quad voltage supervisor, designed to monitor up to four supply voltages with a single device. when any supply voltage drops below its preset threshold, the cat8710 will output a single reset to the threshold. one cat8710 ic eliminates the need for multiple reset circuits, which minimizes system components and improves reliability. the cat8710 provides 2 factory preset thresholds for monitoring 3.3 v, 3.0 v, 2.5 v, and 1.8 v supplies within 5% and 2 user-selectable thresholds, adjustable down to 0.62 v with 2% accuracy. on power up, the reset remains low for 120 ms typical, after all voltages have risen above their selected thresholds. the output remains valid as long as vdd remains above 1 v. the cat8710 is available in a 6 ? pin tsot ? 23 package and operates over the industrial temperature range of ? 40 c to +85 c. features ? monitors 4 power ? supply voltages simultaneously ? 2 factory preset reset threshold options for 3.3 v, 3.0 v, 2.5 v, and 1.8 v supplies ? 2 user ? programmed threshold monitors, adjustable down to 0.62 v with 2% accuracy ? drop ? in replacement to max6710 ? low supply current: 3 a (typ) ? ultra low power vs. maxim ? reset timeout period: 120 ms (typ) ? reset valid to v cc = 1 v ? immune to short supply transients ? temperature range: ? 40 c to +85 c ? small, tsot ? 23 6 ? pin package ? this device is pb ? free, halogen free/bfr free and rohs compliant applications ? monitoring of multiple power supply voltages figure 1. typical application circuit power supplies vdd v3 gnd v4 v1 cat8710 reset p v2/vdd http://onsemi.com pin connections (top view) see detailed ordering and shipping information in the package dimensions section on page 2 of this data sheet. ordering information tsot ? 23 ? 6 td suffix case 419af vj = specific device code y = production year (last digit) m = production month: 1 ? 9, a, b, c marking diagram reset gnd v4 1 v1 v2/vdd v3 1 vjym
cat8710 http://onsemi.com 2 timer (120 ms) vref3 0.62 v 0.62 v vref vdd gnd v3 v1 v4 figure 2. cat8710 block diagram reset v2/vdd table 1. pin function pin name function v1 adjustable under ? voltage detector input. v2/vdd first preset under ? voltage detector input and power for internal circuitry. v3 second preset under ? voltage detector input. v4 adjustable under ? voltage detector input. gnd ground reset open drain active low reset output table 2. ordering information part number nominal input voltage [v] supply tolerance package t&r quantity v1 v2/vdd v3 v4 cat8710ftd ? gt3 adj 3.3 2.5 1.8 5% tsot ? 23 ? 6 3,000 cat8710jtd ? gt3 (note 1) 3.3 2.5 adj cat8710ltd ? gt3 (note 1) 3.3 1.8 adj cat8710ntd ? gt3 (note 1) 3.0 2.5 adj cat8710ptd ? gt3 (note 1) 3.0 1.8 adj 1. consult factory for availability.
cat8710 http://onsemi.com 3 table 3. absolute maximum ratings rating value unit v dd , vx, reset to gnd ? 0.3 to +6.0 v continuous reset current 20 ma operating temperature range ? 40 to +85 c storage temperature range ? 65 to +150 c junction temperature +150 c lead temperature (soldering, 10 s) +300 c stresses exceeding maximum ratings may damage the device. maximum ratings are stress ratings only. functional operation above t he recommended operating conditions is not implied. extended exposure to stresses above the recommended operating conditions may af fect device reliability. table 4. electrical characteristics (v dd = 1.0 v to 5.5 v, t a = ? 40 c to +85 c, unless otherwise noted. typical values are at v dd = 3.0 v to 3.3 v, t a = +25 c.) (note 2) symbol parameter test conditions min typ max units v dd operating voltage 1.5 5.5 v i dd supply current v dd = 5 v 3 9 a i dd3 v dd3 = 3.3 v 0.5 3 a i adj leakage current, v1, v4 v adj = 1.0 v 15 50 na v in input voltage threshold on v2/vdd and v3 3.3 v = v dd 3.00 3.08 3.15 v 3.0 v = v dd 2.70 2.78 2.85 2.5 v = v dd 2.25 2.32 2.38 1.8 v = v dd 1.62 1.67 1.71 v th adjustable threshold monitored voltage decreasing 0.611 0.620 0.629 v v hyst reset threshold hysteresis monitored voltage increasing compared to monitored voltage decreasing 0.3 %v th tcv th reset threshold temperature coefficient 60 ppm/ c t rd v in to reset delay v in falling at 10 mv/ s from v th to (v th ? 50 mv) 1 6 s t rp reset timeout period cat8710 70 120 240 ms v ol reset output low v cc 5 v, i sink = 2.5 ma 0.05 0.4 v v cc < 3.3 v, i sink = 1.5 ma 0.05 0.4 2. 100% production tested at t a = +25 c. limits over temperature guaranteed by design. 3. the devices are powered from v dd . 4. the reset output is guaranteed to be in the correct state for v dd down to 1 v.
cat8710 http://onsemi.com 4 typical characteristics (v dd = v cc = 3.0 v, t a = +25 c, unless otherwise specified.) figure 3. i dd input current vs. temperature figure 4. i dd input current vs. v dd voltage temperature ( c) v dd , voltage (v) 60 10 ? 40 1.00 1.05 1.10 1.15 1.20 1.25 1.30 6.5 5.5 4.5 3.5 2.5 1.150 1.155 1.165 1.170 1.180 1.185 1.190 1.200 figure 5. reset delay vs. reset threshold overdrive (as monitored voltage is decreasing) figure 6. reset pull ? up and pulldown response (c l = 47 pf, r l = 470 k ) reset threshold overdrive (mv) 500 s / div 400 200 0 0 5 10 15 20 25 in_ figure 7. reset timeout delay vs. temperature figure 8. reset timeout delay temperature ( c) 20 ms / div 60 10 ? 40 90 100 110 120 130 140 150 i dd , input current ( a) i dd , input current ( a) reset delay ( s) reset timeout delay (ms) v dd = 5.5 v v dd = 3 v 100mv/div reset 2 v / div 1.160 1.175 1.195 reset 2 v / div in_ 2 v / div v dd = 5.5 v v dd = 3 v
cat8710 http://onsemi.com 5 detailed description the cat8710 is a space-saving, low-power, quad voltage microprocessor supervisory circuit designed to monitor 4 voltage supplies. the cat8710 has 2 factory preset thresholds for monitoring standard power supply voltages of 3.3 v, 3.0 v, 2.5 v, or 1.8 v, and 2 adjustable thresholds for monitoring voltages as low as 0.62 v. each internal voltage comparator has a typical hysteresis of 0.3% with respect to its reset threshold, which improves immunity to ambient noise without significantly reducing threshold accuracy. cat8710 is designed to ignore short transients. applications information reset output cat8710 provides an extended reset signal 120 ms (typ) in duration. the output is open drain and requires an external pull-up resistor to an external power supply. this supply can be less than or greater than vdd, but should not exceed 5.5 v. when the external pull ? up voltage is greater than vdd reverse current flow from the external pull ? up voltage to vdd is prevented by cat8710?s internal circuitry. the cat8710 is powered by vdd, which is also a monitored voltage. when any supply drops below its threshold, the reset output asserts low and remains low as long as vdd is above 1.0 v. figure 9. reset output timing diagram figure 10. interfacing to different logic ? supply voltage 3.3 v 5 v v3 gnd v4mon v1mon cat8710 reset reset p v2/vdd adjustable thresholds cat8710 allows users to create 2 custom voltage thresholds. the threshold voltage at each adjustable input is typically 0.62 v. monitoring of voltages greater than 0.62 v requires a resistor-divider network to be connected to the circuit (figure 11). vin 0.62 v (r1 r2) r2 or, written in terms of r1: r1 r2 vin 0.62 v 1 because the cat8710 has a guaranteed input current of less than 50 na on the adjustable inputs, resistor values up to 1000 k can be used for r2 with < 1% error. unused inputs connect unused monitor inputs to a supply voltage greater in magnitude than their specified threshold voltages; use v dd for normal operation (device power ? supply pin). do not connect unused monitor inputs to ground or allow them to float. adding manual reset capability figure 12 illustrates how to add manual reset to the cat8710. depressing the pushbutton switch short ? circuits the analog input to ground and initiates a reset pulse. this technique can be used on either the v1 or v4 inputs. the switch must be open for at least 120 ms in order to deassert the reset output. no external switch debounce is required. a small capacitor across r 2 will improve noise immunity when using long leads from the pushbutton switch to the adjustable input. por applying power to the cat8710 activates a por circuit which act ivates the reset output (activ e low). at power ? up por prevents the system microprocessor from starting to operate with insufficient voltage and prior to stabilization of the clock oscillator. it ensures that operation is precluded until internal registers are properly loaded, fpga?s have downloaded their configuration data. the reset signal remains active until all monitored power supplies have risen above their minimum preset voltage levels. power ? supply bypassing all monitored inputs are immune to short supply transients. for applications where higher immunity is required, connect a 0.1 f bypass capacitor from each input pin to ground very close to cat8710?s package.
cat8710 http://onsemi.com 6 figure 11. setting the auxiliary monitor cat8710 vref r1 r2 vin v1 v2/vdd v3 r1 v + cat8710 r2 manual reset figure 12. adding manual reset capability v4 (v adj ) reset
cat8710 http://onsemi.com 7 package dimensions tsot ? 23, 6 lead case 419af ? 01 issue o e1 e a2 a1 e b d c a top view side view end view l1 l l2 notes: (1) all dimensions are in millimeters. angles in degrees. (2) complies with jedec mo-193. symbol min nom max a a1 a2 b c d e e1 e l 0o 8o l1 l2 0.01 0.80 0.30 0.12 0.30 0.05 0.87 0.15 2.90 bsc 2.80 bsc 1.60 bsc 0.95 typ 0.40 0.60 ref 0.25 bsc 1.00 0.10 0.90 0.45 0.20 0.50 on semiconductor and are registered trademarks of semiconductor components industries, llc (scillc). scillc reserves the right to mak e changes without further notice to any products herein. scillc makes no warranty, representation or guarantee regarding the suitability of its products for an y particular purpose, nor does scillc assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including wi thout limitation special, consequential or incidental damages. ?typical? parameters which may be provided in scillc data sheets and/or specifications can and do vary in different application s and actual performance may vary over time. all operating parameters, including ?typicals? must be validated for each customer application by customer?s technical experts. scillc does not convey any license under its patent rights nor the rights of others. scillc products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications intended to support or sustain life, or for any other application in which the failure of the scillc product could create a sit uation where personal injury or death may occur. should buyer purchase or use scillc products for any such unintended or unauthorized application, buyer shall indemnify and hold scillc and its of ficers, employees, subsidiaries, af filiates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, direct ly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that scillc was negligent regarding the design or manufacture of the part. scillc is an equal opportunity/affirmative action employer. this literature is subject to all applicable copyright laws and is not for resale in any manner. cat8710/d publication ordering information n. american technical support : 800 ? 282 ? 9855 toll free usa/canada europe, middle east and africa technical support: phone: 421 33 790 2910 japan customer focus center phone: 81 ? 3 ? 5773 ? 3850 literature fulfillment : literature distribution center for on semiconductor p.o. box 5163, denver, colorado 80217 usa phone : 303 ? 675 ? 2175 or 800 ? 344 ? 3860 toll free usa/canada fax : 303 ? 675 ? 2176 or 800 ? 344 ? 3867 toll free usa/canada email : orderlit@onsemi.com on semiconductor website : www.onsemi.com order literature : http://www.onsemi.com/orderlit for additional information, please contact your local sales representative
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