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. http://onsemi.com 1 SOT23−6 TD SUFFIX CASE 527AJ MARKING DIAGRAM 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 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 RESET 1 GND V2/VDD V4 V3 (Top View) Applications • Monitoring of Multiple Power Supply Voltages CAT8710 ORDERING INFORMATION See detailed ordering and shipping information in the package dimensions section on page 2 of this data sheet. VDD V1 Power Supplies V2/VDD RESET V3 mP V4 GND 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 Timer (120 ms) VREF RESET V3 VREF3 GND V4 0.62 V Figure 2. CAT8710 Block Diagram Table 1. PIN FUNCTION Pin Name V1 Function 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 Nominal Input Voltage [V] V2/VDD V3 V4 CAT8710FTD−GT3 3.3 2.5 1.8 CAT8710JTD−GT3 (Note 1) 3.3 2.5 Adj Part Number CAT8710LTD−GT3 (Note 1) V1 3.3 1.8 Adj CAT8710NTD−GT3 (Note 1) 3.0 2.5 Adj CAT8710PTD−GT3 (Note 1) 3.0 1.8 Adj Adj 1. Consult factory for availability. http://onsemi.com 2 Supply Tolerance Package T&R Quantity 5% SOT−23−6 3,000 CAT8710 Table 3. ABSOLUTE MAXIMUM RATINGS Rating Value Unit −0.3 to +6.0 V 20 mA Operating Temperature Range −40 to +85 °C Storage Temperature Range VDD, Vx, RESET to GND Continuous RESET Current −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 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 Parameter VDD Operating Voltage IDD Supply Current IDD3 Test Conditions Min Typ 1.5 Max 5.5 V 3 9 mA VDD3 = 3.3 V 0.5 3 mA 15 50 nA V VDD = 5 V IADJ Leakage Current, V1, V4 VADJ = 1.0 V VIN Input Voltage Threshold on V2/VDD and V3 3.3 V = VDD 3.00 3.08 3.15 3.0 V = VDD 2.70 2.78 2.85 2.5 V = VDD 2.25 2.32 2.38 1.8 V = VDD 1.62 1.67 1.71 Adjustable Threshold Monitored voltage decreasing 0.611 0.620 0.629 VHYST Reset Threshold Hysteresis Monitored voltage increasing compared to monitored voltage decreasing TCVTH Reset Threshold Temperature Coefficient VTH Units V 0.3 %VTH 60 ppm/°C ms tRD VIN to Reset Delay VIN falling at 10 mV/ms from VTH to (VTH – 50 mV) 1 6 tRP Reset Timeout Period CAT8710 70 120 240 ms VOL RESET Output Low VCC ≥ 5 V, ISINK = 2.5 mA 0.05 0.4 V VCC < 3.3 V, ISINK = 1.5 mA 0.05 0.4 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. http://onsemi.com 3 CAT8710 TYPICAL CHARACTERISTICS (VDD = VCC = 3.0 V, TA = +25°C, unless otherwise specified.) 1.200 1.195 1.25 VDD = 5.5 V 1.20 VDD = 3 V 1.15 1.10 1.05 1.00 −40 10 IDD, INPUT CURRENT (mA) IDD, INPUT CURRENT (mA) 1.30 1.190 1.185 1.180 1.175 1.170 1.165 1.160 1.155 1.150 60 2.5 3.5 4.5 5.5 TEMPERATURE (°C) VDD, VOLTAGE (V) Figure 3. IDD Input Current vs. Temperature Figure 4. IDD Input Current vs. VDD Voltage 25 IN_ 100mV/div RESET DELAY (ms) 20 15 10 RESET 2 V / div 5 0 0 200 400 RESET THRESHOLD OVERDRIVE (mV) 500 ms / div Figure 5. RESET Delay vs. RESET Threshold Overdrive (As Monitored Voltage is Decreasing) Figure 6. RESET Pull−up and Pulldown Response (CL = 47 pF, RL = 470 kW) RESET TIMEOUT DELAY (ms) 150 IN_ 2 V / div 140 130 VDD = 5.5 V 120 110 VDD = 3 V RESET 2 V / div 100 90 −40 10 60 TEMPERATURE (°C) 20 ms / div Figure 7. RESET Timeout Delay vs. Temperature Figure 8. RESET Timeout Delay http://onsemi.com 4 6.5 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. 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 or, written in terms of R1: (R1 ) R2) R2 VIN * 1Ǔ ǒ0.62 V R1 + R2 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. 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. Unused Inputs 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 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. Figure 9. RESET Output Timing Diagram 5V CAT8710 V1MON 3.3 V V2/VDD RESET V3 mP 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. RESET V4MON GND Figure 10. Interfacing to Different Logic−Supply Voltage http://onsemi.com 5 CAT8710 VIN CAT8710 CAT8710 V + V1 V2/VDD V3 RESET R1 R1 V4 (VADJ) R2 Manual Reset VREF R2 Figure 12. Adding Manual Reset Capability Figure 11. Setting the Auxiliary Monitor http://onsemi.com 6 CAT8710 PACKAGE DIMENSIONS SOT−23, 6 Lead CASE 527AJ−01 ISSUE O D SYMBOL e E1 E MIN NOM 0.90 1.45 A1 0.00 0.15 A2 0.90 b 0.30 0.50 c 0.08 0.22 1.15 D 2.90 BSC E 2.80 BSC E1 1.60 BSC e L 0.45 0.60 0.60 REF L2 TOP VIEW 1.30 0.95 BSC 0.30 L1 PIN #1 IDENTIFICATION MAX A 0.25 REF θ 0° 4° 8° θ1 5° 10° 15° θ2 5° 10° 15° θ1 A2 A θ b θ2 L1 A1 SIDE VIEW 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. 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