Voltage Monitors & Supervisors Quick Guide Linear Technology’s voltage monitors and supervisors monitor positive and negative power supplies ranging from 0.5V to 48V, with integration of up to eight supply monitors in a tiny package. Not all supervisors are created equal. Look for the following important features. 5V NOMINAL SUPPLY VOLTAGE SUPPLY TOLERANCE MINIMUM RELIABLE SYSTEM VOLTAGE IDEAL SUPERVISOR THRESHOLD 4.75V ±1.5% THRESHOLD BAND –5% 4.675V 1.5% Guaranteed Threshold Accuracy For a 5V system with ±5% tolerance, the supply may vary between 4.75V to 5.25V, requiring a perfectly accurate supervisor to generate a reset at exactly 4.75V. However, the actual reset threshold of a supervisor varies over a specified band. The actual reset threshold accuracy of most Linear Technology supervisors is ±1.5% around the nominal threshold voltage (i.e., 4.675V), minimizing the required system voltage margin and probability of system malfunction. –6.5% 4.6V –8% Voltage Threshold Settings REGION OF POTENTIAL MALFUNCTION Adjustable/Pin-Selectable Thresholds and Tolerances Adjustable and pin-selectable thresholds provide users with maximum flexibility, allowing a single part to be used across multiple designs. No need to hassle with factory-trimmed thresholds and tolerances or the procurement of multiple parts. Linear Technology supervisors with adjustable inputs (ADJ) allow selection of virtually any voltage using external resistors. And supervisors with pin-selectable thresholds and tolerances possess the most common supply voltage thresholds (or threshold combinations) and tolerances without the need for precision external resistors. VCC 5V VCC Open 3.3V VCC GND 2.5V Open VCC 1.8V Open Open 1.5V Open GND 1.2V GND VCC 1V GND ADJ (0.5V) GND SEL2 VCC LTC2917-B VM SEL1 RST Open SEL2 WDI GND TOL GND TOL Tolerance –5% VCC –10% Open –15% GND Some applications require a valid reset signal down to low supply voltages in order to prevent low voltage components from generating erroneous data or malfunction as a system powers up or down. Linear Technology supervisors guarantee a valid reset signal to an industry leading low of 0.5V to help preserve system integrity. 4 3 2 Allowable Glitch Duration vs Magnitude 1 0 1 2 3 4 SUPPLY VOLTAGE, VCC (V) Glitch Immunity 5 DC supplies can have high frequency variation from sources such as load transients, noise and pickup, all of which can cause spurious outputs at RST. Linear Technology supervisors combat glitches using voltage-dependent response time filtering, providing rejection of small, short duration glitches and faster response times as monitor overdrive increases. MAXIMUM ALLOWABLE GLITCH DURATION (µs) RST VOLTAGE (V) VCC Guaranteed RESET for Supply Voltages ≥ 0.5V 10k PULL-UP R TO VCC SEL1 = SEL2 = TOL = 0V 5 VM = 0.5V 0 SEL1 12V System Voltage Tolerance Settings RST Output Voltage vs VCC 6 Nominal Voltage 300 250 200 RESET OCCURS ABOVE CURVE 150 100 50 0 L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. 1 10 100 0.1 GLITCH PERCENTAGE PAST THRESHOLD (%) WT RT LTC®2910 8 (8) LTC2933 6 (6) Adj Adj 1.5 1 Adj Adj 50 700 • • • LTC2936 6 (6) Adj 1 Adj 700 • • LTC2939 LTC2908 6 (4) 6 (5) 1.5 1.5 Adj 200ms 80 26 LTC2930 LTC2931 LTC2932 LTC2900 LTC2938 LTC2901 6 (4) 6 (4) 6 (4) 4 (2) 4 (2) 4 (2) 5 to 1.2 5, 3.3, 2.5, 1.8, 1.5 5 to 1.5 5 to 1.5 5 to 1.5 5 to 1.5 5 to 1.2 5 to 1.5 1.5 1.5 1.5 1.5 1.5 1.5 Adj Adj Adj Adj Adj Adj 52 52 52 43 80 43 LTC2902 4 (2) 5 to 1.5 1.5 Adj 43 LTC2903 4 (3) 1.5 200ms 20 LTC2914 LTC2911 4 (4) 3 (2) 1.5 1.5 Adj 70 30 LTC1326 LTC1536 LTC1726 LTC1727 LTC1728 LTC2919 3 (1) 3 (1) 3 (1) 3 (1) 3 (1) 3 (2) 5, 3.3, 2.5, 1.8, –5.2 Adj 5, 3.3, 2.5, 1.8, 1.2 5, 3.3, 2.5 5, 3.3 5, 3.3, 2.5 5, 3.3, 3, 2.5 5, 3.3, 3, 2.5, 1.8 5, 3.3, 2.5 0.75 0.75 1.5 1.5 1.5 1.5 200ms 200ms Adj 200ms 200ms Adj 40 200 20 15 15 50 LTC2909 3 (2) 5, 3.3, 2.5 1.5 Adj 50 LTC2966 2 (2) Adj 1.4 LTC2960 2(2) Adj 1.5 LTC2913 2 (2) Adj 1.5 LTC1696 LTC2904 LTC2905 LTC2906 LTC2907 LTC2934 2 (2) 2 (0) 2 (0) 2 (1) 2 (1) 2 (2) Adj 5 to 1 5 to 1 5, 3.3, 2.5 5, 3.3, 2.5 Adj 2 1.5 1.5 1.5 1.5 1.5 LTC2965 1 (1) Adj 1.4 LTC2935 LTC2915 LTC2916 LTC2917 LTC2918 LTC2912 LTC1232 1 (1) 1 (1) 1 (1) 1 (1) 1 (1) 1 (1) 1 (0) 1.6 to 3.5 12 to 0.5 12 to 0.5 12 to 0.5 12 to 0.5 Adj 5 1.5 1.5 1.5 1.5 1.5 1.5 2.5 LTC1235 LTC690 LTC691 LTC694 LTC695 1 (0) 1 (0) 1 (0) 1 (0) 1 (0) 5 5 5 5, 3.3 5, 3.3 2 2 2 2 2 Adj 200ms Adj 200ms Adj 15ms/ 200ms 200ms Adj Adj Adj Adj Adj 600ms 200ms 50ms 50ms 200ms 200ms • • • • Adj • • • • • 44 • 1.1mA 65 65 50 54 0.5 • • • • 6 600 600 600 600 600 • • • • • • • • Adj Adj • C, I, H 3 × 3 DFN-12 C, I, H TSSOP-20 C, I, H TSSOP-20 C, I MSOP-10, 3 × 3 DFN-10 C, I, H MSOP-16 C, I SSOP-16 • UV/OV Outputs, Optional Shunt Reg For High Voltage Operation Margining Latch, Guaranteed Reset for VCC ≥ 0.5V Separate Voltage Monitor Outputs 0.85 0.5 30 30 30 30 40 500 16 Pin-Selectable Reset Thresholds Combinations 16 Pin-Selectable Reset Thresholds Combinations, Separate Voltage Monitor Outputs 16 Pin-Selectable Reset Thresholds Combinations, Separate Voltage Monitor Outputs 16 Pin-Selectable Reset Threshold Combinations, Open Drain or Push-Pull Reset Output 16 Pin-Selectable Reset Thresholds 16 Pin-Selectable Reset Thresholds, Separate Voltage Monitor Outputs, Open Drain or Push-Pull Reset Output • 16 Pin-Selectable Reset Thresholds, Separate Voltage Monitor Outputs, Open Drain or Push-Pull Reset Output Guaranteed Reset for VCC ≥ 0.5V Reset and Soft Reset Outputs Reset and Soft Reset Outputs, Added Tests for PCI Conformity • • • • • • • • • • Package • Resistor Programmable Thresholds, RST & RST Outputs, Shunt Regulator C, I, H SSOP-16, 5 × 3 DFN-16 • I2C Programmable, EEPROM, 256 Thresholds, One High Voltage Input, Two GPIs, C, I SSOP-16, 5 × 4 DFN-16 Three GPIOs, Two Auxilliary Comparators with Resistor Adjustable Thresholds • I2C Programmable, EEPROM, 256 Thresholds, Six Comparator Outputs, Two GPI, C, I SSOP-24, 4 × 5 QFN-24 Three GPIO, Two Auxilliary Comparators with Resistor Adjustable Thresholds • 16 Pin-Selectable Reset Threshold Combinations, Adj Reset and Watchdog Timers C, I, H MSOP-16 C, I TSOT-8, 3 × 2 DFN-8 Guaranteed Reset for VCC ≥ 0.5V • • • • • • • Adj Adj 12 15ms/ 200ms • Adj Comments Temp Grades* Watchdog Timer Power Fail Warning Manual Reset OV Monitor Negative Monitor Reset Pulse Width Supply Current (µA) Accuracy (%) # of Voltage Monitors (# of Adj Inputs) Part # Monitor Voltages (V) • Pin-Selectable Polarity for Negative and UV/OV Monitoring, Shunt Regulator, VCC Separate Voltage Monitor Outputs, Guaranteed Reset for VCC ≥ 0.5V • Pin-Selectable Polarity for Negative and UV/OV Monitoring, Shunt Regulator, VCC Monitor, Guaranteed Reset for VCC ≥ 0.5V • 3.5V to 100V Operation, Resistor Programmable Thresholds, Internal High Value Resistive Dividers, Pin-Selectable Output Polarity 2.5V to 36V Operation, Resistor Programmable Thresholds Resistor Programmable Reset Thresholds, UV/OV Outputs, Shunt Regulator, Guaranteed Reset for VCC ≥ 0.5V Resistor Programmable Reset Thresholds, Gate Drive for Crowbar 9 Pin-Selectable Reset Thresholds 9 Pin-Selectable Reset Thresholds Pin-Selectable and Resistor Programmable Reset Thresholds Pin-Selectable and Resistor Programmable Reset Thresholds Resistor Programmable Reset Threshold • 3.5V to 100V Operation, Resistor Programmable Thresholds, Internal High Value Resistive Dividers, Pin-Selectable Output Polarity 8 Pin-Selectable Reset Thresholds 9 Pin-Selectable Reset Thresholds, 3 Tolerances 9 Pin-Selectable Reset Thresholds 9 Pin-Selectable Reset Thresholds, 3 Tolerances 9 Pin-Selectable Reset Thresholds Resistor Programmable Reset Threshold, UV/OV Outputs, Shunt Regulator Conditional Battery Backup, RAM Protect Battery Backup, 4.65V Reset Battery Backup, RAM Protect, 4.65V Reset Battery Backup, 4.65V Reset Battery Backup, RAM Protect, 4.65V Reset C, I SSOP-16 C, I TSOT-6 C, I, H C, I, H SSOP-16, 5 × 3 DFN-16 3 × 2 DFN-8, TSOT-8 C, I MSOP-8, SO-8 C, I MSOP-8, SO-8 C, I, H MSOP-8, SO-8 C, E, I MSOP-8, SO-8 C, E, H TSOT-5 C, I, H MSOP-10, 3 × 2 DFN-10 C, I TSOT-8, 3 × 2 DFN-8 C, I, H SO-10, 3 × 3 QFN-16 C, I, H TSOT-8, 2 × 2 DFN-8 C, I, H MSOP-10, 3 × 3 DFN-10 C, E C, I C, I, H C, I C, I C, I TSOT-6 TSOT-8, 3 × 2 DFN-8 TSOT-8, 3 × 2 DFN-8 TSOT-8, 3 × 2 DFN-8 TSOT-8, 3 × 2 DFN-8 TSOT-8, 2 × 2 DFN-8 C, I, H MSOP-16, 3 × 3 DFN-8 C, I TSOT-8, 2 × 2 DFN-8 C, I, H TSOT-8, 3 × 2 DFN-8 C, I, H TSOT-8, 3 × 2 DFN-8 C, I, H MSOP-10, 3 × 2 DFN-10 C, I, H MSOP-10, 3 × 2 DFN-10 C, I, H TSOT-8, 3 × 2 DFN-8 C, I DIP-8, SO-8 C C, I C, I C, I C, I DIP-16, SO-16 DIP-8, SO-8 DIP-16, SO-16 DIP-8, SO-8 DIP-16, SO-16 * C = 0°C to 70°C, E = –40°C to 85°C (Guaranteed by Design Only), I = –40°C to 85°C, H = –40°C to 125°C (100% Tested) www.linear.com/supervisors n 1-800-4-LINEAR 1214D