CAT8710

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 SOT23 package and operates over the industrial temperature range of −40°C to +85°C. Features http://onsemi.com 1 SOT23−6 TD SUFFIX CASE 527AJ MARKING DIAGRAM • 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 mA (typ) Ultra Low Power vs. Maxim Reset Timeout Period: 120 ms (typ) RESET Valid to VCC = 1 V Immune to Short Supply Transients Temperature Range: −40°C to +85°C Small, SOT23 6−Pin Package This Device is Pb−Free, Halogen Free/BFR Free and RoHS Compliant VJYM VJ = Specific Device Code Y = Production Year (last digit) M = Production Month: 1−9, A, B, C PIN CONNECTIONS V1 V2/VDD V3 (Top View) 1 RESET GND V4 Applications • Monitoring of Multiple Power Supply Voltages CAT8710 V1 Power Supplies V2/VDD RESET V3 V4 GND mP VDD ORDERING INFORMATION See detailed ordering and shipping information in the package dimensions section on page 2 of this data sheet. Figure 1. Typical Application Circuit © Semiconductor Components Industries, LLC, 2010 March, 2010 − Rev. 1 1 Publication Order Number: CAT8710/D CAT8710 V1 0.62 V VDD V2/VDD RESET VREF V3 Timer (120 ms) VREF3 V4 GND 0.62 V Figure 2. CAT8710 Block Diagram Table 1. PIN FUNCTION Pin Name V1 V2/VDD V3 V4 GND RESET Function Adjustable under−voltage detector input. First preset under−voltage detector input and power for internal circuitry. Second preset under−voltage detector input. Adjustable under−voltage detector input. Ground Open Drain active LOW reset output Table 2. ORDERING INFORMATION Nominal Input Voltage [V] Part Number CAT8710FTD−GT3 CAT8710JTD−GT3 (Note 1) CAT8710LTD−GT3 (Note 1) CAT8710NTD−GT3 (Note 1) CAT8710PTD−GT3 (Note 1) 1. Consult factory for availability. Adj V1 V2/VDD 3.3 3.3 3.3 3.0 3.0 V3 2.5 2.5 1.8 2.5 1.8 V4 1.8 Adj Adj Adj Adj 5% SOT−23−6 3,000 Supply Tolerance Package T&R Quantity http://onsemi.com 2 CAT8710 Table 3. ABSOLUTE MAXIMUM RATINGS Rating VDD, Vx, RESET to GND Continuous RESET Current Operating Temperature Range Storage Temperature Range Junction Temperature Lead Temperature (soldering, 10 s) Value −0.3 to +6.0 20 −40 to +85 −65 to +150 +150 +300 Unit V mA °C °C °C °C Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect device reliability. Table 4. ELECTRICAL CHARACTERISTICS (VDD = 1.0 V to 5.5 V, TA = −40°C to +85°C, unless otherwise noted. Typical values are at VDD = 3.0 V to 3.3 V, TA = +25°C.) (Note 2) Symbol VDD IDD IDD3 IADJ VIN Leakage Current, V1, V4 Input Voltage Threshold on V2/VDD and V3 Parameter Operating Voltage Supply Current VDD = 5 V VDD3 = 3.3 V VADJ = 1.0 V 3.3 V = VDD 3.0 V = VDD 2.5 V = VDD 1.8 V = VDD VTH VHYST TCVTH tRD tRP VOL Adjustable Threshold Reset Threshold Hysteresis Reset Threshold Temperature Coefficient VIN to Reset Delay Reset Timeout Period RESET Output Low VIN falling at 10 mV/ms from VTH to (VTH – 50 mV) CAT8710 VCC ≥ 5 V, ISINK = 2.5 mA VCC < 3.3 V, ISINK = 1.5 mA 2. 100% production tested at TA = +25°C. Limits over temperature guaranteed by design. 3. The devices are powered from VDD. 4. The RESET output is guaranteed to be in the correct state for VDD down to 1 V. 1 70 Monitored voltage decreasing Monitored voltage increasing compared to monitored voltage decreasing 3.00 2.70 2.25 1.62 0.611 Test Conditions Min 1.5 3 0.5 15 3.08 2.78 2.32 1.67 0.620 0.3 60 6 120 0.05 0.05 240 0.4 0.4 Typ Max 5.5 9 3 50 3.15 2.85 2.38 1.71 0.629 V %VTH ppm/°C ms ms V Units V mA mA nA V http://onsemi.com 3 CAT8710 TYPICAL CHARACTERISTICS (VDD = VCC = 3.0 V, TA = +25°C, unless otherwise specified.) 1.30 IDD, INPUT CURRENT (mA) IDD, INPUT CURRENT (mA) 1.25 VDD = 5.5 V 1.20 1.15 1.10 1.05 1.00 −40 VDD = 3 V 1.200 1.195 1.190 1.185 1.180 1.175 1.170 1.165 1.160 1.155 1.150 10 TEMPERATURE (°C) 60 2.5 3.5 4.5 VDD, VOLTAGE (V) 5.5 6.5 Figure 3. IDD Input Current vs. Temperature 25 20 RESET DELAY (ms) 15 10 5 0 RESET 2 V / div 0 200 400 IN_ 100mV/div Figure 4. IDD Input Current vs. VDD Voltage RESET THRESHOLD OVERDRIVE (mV) 500 ms / div Figure 5. RESET Delay vs. RESET Threshold Overdrive (As Monitored Voltage is Decreasing) 150 RESET TIMEOUT DELAY (ms) 140 130 120 110 100 90 −40 VDD = 5.5 V VDD = 3 V RESET 2 V / div 10 TEMPERATURE (°C) 60 IN_ 2 V / div Figure 6. RESET Pull−up and Pulldown Response (CL = 47 pF, RL = 470 kW) 20 ms / div Figure 7. RESET Timeout Delay vs. Temperature Figure 8. RESET Timeout Delay http://onsemi.com 4 CAT8710 Detailed Description Adjustable Thresholds 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 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 * 1 0.62 V Because the CAT8710 has a guaranteed input current of less than 50 nA on the adjustable inputs, resistor values up to 1000 kW can be used for R2 with < 1% error. Unused Inputs 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. Connect unused monitor inputs to a supply voltage greater in magnitude than their specified threshold voltages; use VDD 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 R2 will improve noise immunity when using long leads from the pushbutton switch to the adjustable input. POR Figure 9. RESET Output Timing Diagram 5V CAT8710 V1MON 3.3 V V2/VDD RESET V3 V4MON GND mP RESET Applying power to the CAT8710 activates a POR circuit which activates the reset output (active 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 mF bypass capacitor from each input pin to ground very close to CAT8710’s package. Figure 10. Interfacing to Different Logic−Supply Voltage http://onsemi.com 5 CAT8710 VIN CAT8710 CAT8710 V1 V2/VDD V3 RESET R1 V4 (VADJ) R2 V + R1 R2 VREF Manual Reset Figure 11. Setting the Auxiliary Monitor Figure 12. Adding Manual Reset Capability http://onsemi.com 6 CAT8710 PACKAGE DIMENSIONS SOT−23, 6 Lead CASE 527AJ−01 ISSUE O D e SYMBOL A A1 A2 b c E1 E D E E1 e L PIN #1 IDENTIFICATION TOP VIEW L1 L2 0.30 MIN 0.90 0.00 0.90 0.30 0.08 2.90 BSC 2.80 BSC 1.60 BSC 0.95 BSC 0.45 0.60 REF 0.25 REF 0.60 1.15 NOM MAX 1.45 0.15 1.30 0.50 0.22 θ θ1 θ2 0° 5° 5° 4° 10° 10° 8° 15° 15° θ1 A2 A θ b θ2 SIDE VIEW A1 L1 L2 L c END VIEW Notes: (1) All dimensions in millimeters. Angles in degrees. (2) Complies with JEDEC standard MO-178. ON Semiconductor and are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make changes without further notice to any products herein. SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for any 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 without 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 applications 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 situation 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 officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly 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. PUBLICATION ORDERING INFORMATION 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 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 ON Semiconductor Website: www.onsemi.com Order Literature: http://www.onsemi.com/orderlit For additional information, please contact your local Sales Representative http://onsemi.com 7 CAT8710/D