LTC2934ITS8-2#TRPBF

LTC2934 Ultra-Low Power Adjustable Supervisor with Power-Fail Output DESCRIPTION FEATURES n n n n n n n n n 500nA Quiescent Current ±1.5% (Max) Accuracy over Temperature Operates Down to 1.6V Supply Adjustable Reset Threshold Adjustable Power-Fail Threshold Early Warning Power-Fail Output Selectable 15ms or 200ms Reset Timeout Manual Reset Input Compact 8-Lead, 2mm × 2mm DFN and TSOT-23 (ThinSOT™) Packages APPLICATIONS n n n n n Portable Equipment Battery-Powered Equipment Security Systems Point-of-Sale Devices Wireless Systems , LT, LTC, LTM are registered trademarks of Linear Technology Corporation. ThinSOT is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. The LTC®2934 ultra-low power voltage monitor provides system initialization, power-fail warning and reset generation functions. Low quiescent current (500nA typical) makes the LTC2934 an ideal choice for battery-operated applications. Precision power-fail and reset voltages can be configured independently. Early warning of an impending low voltage condition is provided at the power-fail output (PFO) when the PFI input falls below 0.4V. Supervisory circuits monitor the ADJ input and pull RST low when ADJ falls below 0.4V. When ADJ is rising from an under-threshold condition, an internal reset timer is started after exceeding the ADJ threshold by 5%. The reset timeout delays the return of the RST output to a high state. A pushbutton switch connected to the MR input is typically used to force a manual reset. Outputs RST and PFO are available with open-drain (LTC2934-1) or active pull-up circuits (LTC2934-2). Operating temperature range is from –40ºC to 85ºC. TYPICAL APPLICATION Configurable Low Power Voltage Supervisor Selectable Reset Timeout Period VIN 750k VCC 0.1μF 11.8k VCC PFO ADJ BATTERY POWERED SYSTEM LOGIC LTC2934-2 PFI 237k RST MR RT 15ms RST, RT = GND RST, RT = VCC GND 200ms 2934 TA01b 2934 TA01a POWER FAIL FALLING THRESHOLD = 1.686V RESET FALLING THRESHOLD = 1.606V 2934f 1 LTC2934 ABSOLUTE MAXIMUM RATINGS (Note 1) Input Voltages VCC........................................................... –0.3V to 6V ADJ, PFI ................................................... –0.3V to 6V RT, MR ......................................–0.3V to (VCC + 0.3V) Output Voltages PFO, RST (LTC2934-1)............................. –0.3V to 6V PFO, RST (LTC2934-2)..............–0.3V to (VCC + 0.3V) RMS Currents PFO, RST ..........................................................±5mA Operating Ambient Temperature Range LTC2934C ................................................ 0°C to 70°C LTC2934I.............................................. –40°C to 85°C Storage Temperature Range................... –65°C to 150°C Lead Temperature (Soldering, 10 sec) TSOT-23 Package.............................................. 300°C PIN CONFIGURATION TOP VIEW MR 2 TOP VIEW 8 ADJ VCC 1 9 ADJ 1 PFI 2 RT 3 GND 4 7 PFI RST 3 6 RT PFO 4 5 GND 8 VCC 7 MR 6 RST 5 PFO TS8 PACKAGE 8-LEAD PLASTIC TSOT-23 TJMAX = 125°C, θJA = 195°C/W DC PACKAGE 8-LEAD (2mm × 2mm) PLASTIC DFN TJMAX = 125°C, θJA = 102°C/W EXPOSED PAD (PIN 9) PCB GND CONNECTION OPTIONAL ORDER INFORMATION Lead Free Finish TAPE AND REEL (MINI) TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION LTC2934CTS8-1#TRMPBF LTC2934CTS8-1#TRPBF LTDKR 8-Lead Plastic TSOT-23 LTC2934ITS8-1#TRMPBF LTC2934ITS8-1#TRPBF LTDKR 8-Lead Plastic TSOT-23 LTC2934CTS8-2#TRMPBF LTC2934CTS8-2#TRPBF LTDKS 8-Lead Plastic TSOT-23 LTC2934ITS8-2#TRMPBF LTC2934ITS8-2#TRPBF LTDKS 8-Lead Plastic TSOT-23 LTC2934CDC-1#TRMPBF LTC2934CDC-1#TRPBF LDKT 8-Lead (2mm × 2mm) Plastic DFN LTC2934IDC-1#TRMPBF LTC2934IDC-1#TRPBF LDKT 8-Lead (2mm × 2mm) Plastic DFN LTC2934CDC-2#TRMPBF LTC2934CDC-2#TRPBF LDKV 8-Lead (2mm × 2mm) Plastic DFN LTC2934IDC-2#TRMPBF LTC2934IDC-2#TRPBF LDKV 8-Lead (2mm × 2mm) Plastic DFN TRM = 500 pieces. *Temperature grades are identified by a label on the shipping container. Consult LTC Marketing for parts specified with wider operating temperature ranges. Consult LTC Marketing for information on lead based finish parts. For more information on lead free part marking, go to: http://www.linear.com/leadfree/ For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/ TEMPERATURE RANGE 0°C to 70°C –40°C to 85°C 0°C to 70°C –40°C to 85°C 0°C to 70°C –40°C to 85°C 0°C to 70°C –40°C to 85°C 2934f 2 LTC2934 ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C, VCC = 3.6V, unless otherwise noted. (Note 2) SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS VCC VCC Input Supply Voltage l 5.5 V ICC VCC Input Supply Current l 225 500 1000 nA 394 400 406 mV ±2 ±8 mV 1.6 Threshold Adjustment Inputs: ADJ, PFI VTH Input Threshold (Monitored Voltage Falling) l VTHM ADJ to PFI Threshold Matching l VADJ(HYST) Reset Threshold Hysteresis (Monitored Voltage Rising) l 18 20 25 mV VPFI(HYST) Power-Fail Threshold Hysteresis (Monitored Voltage Rising) l 8 10 15 mV tUV Undervoltage Detect to RST or PFO Falling ITH(LKG) Threshold Adjustment Input Leakage Current VADJ or VPFI = VTH – 4mV (Note 3) 1 VADJ or VPFI = 420mV l 0.1 ms ±1 nA 0.7 • VCC 1.4 V V Control Inputs: MR, RT VIN(TH) Control Input Threshold RT MR l l 0.3 • VCC 0.4 tPW Input Pulse Width MR l 20 tPD Propagation Delay to RST Falling Manual Reset Falling l 2 5 20 μs RPU Internal Pull-Up Resistance MR l 600 900 1200 kΩ ILK Input Leakage Current (RT Input) RT = VCC or GND l ±1 ±10 nA 25 50 100 150 mV mV μs Reset and Power Fail Outputs: RST, PFO VOL Voltage Output Low VCC = 1V, 200μA Pull-Up Current VCC = 3V, 3mA Pull-Up Current l l VOH Voltage Output High (LTC2934-2) –200μA Pull-Down Current l IOH Leakage Current, Output High (LTC2934-1) VRST, VPFO = 3.6V l tRST Reset Timeout Period RT Input High RT Input Low l l Note 1: Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. Exposure to any Absolute Maximum Rating condition for extended periods may affect device reliability and lifetime. 0.7 • VCC 140 10 V ±1 ±10 nA 200 15 260 25 ms ms Note 2. All currents into pins are positive, all voltages are referenced to GND unless otherwise noted. Note 3. Guaranteed by design. Characterized, but not production tested. 2934f 3 LTC2934 TYPICAL PERFORMANCE CHARACTERISTICS Supply Current vs Supply Voltage 1000 TA = 25°C, unless otherwise noted. ADJ, PFI Threshold vs Temperature 406 EXTERNALLY CONFIGURED FOR 3V FALLING THRESHOLDS 404 800 85°C VTH (mV) ICC (nA) 402 600 25°C 400 –40°C 398 200 0 400 396 0 1 2 3 VCC (V) 5 4 394 –50 6 –25 0 25 50 TEMPERATURE (°C) 75 2934 G01 2934 G02 Comparator Undervoltage Glitch Immunity Reset Timeout Period vs Temperature 260 VCC = 3.6V VCC = RT = 3.6V 240 2.5 2.0 220 COMPARATORS PULL DOWN ABOVE CURVE tRST (ms) GLITCH DURATION, t UV (ms) 3.0 100 1.5 200 1.0 180 0.5 160 0 0.1 1 10 COMPARATOR OVERDRIVE (%) 140 –50 100 –25 0 25 50 TEMPERATURE (°C) 75 2934 G03 2934 G04 Voltage Output Low vs Pull-Up Current (RST, PFO) 100 Voltage Output High vs Pull-Down Current (RST, PFO) 3.6 VCC = 3V 100 LTC2934-2 VCC = 3.6V 85°C 80 3.5 60 VOH (mV) VOL (mV) 25°C –40°C 40 25°C 3.3 20 0 –40°C 3.4 85°C 0 1 2 3 4 PULL-UP CURRENT (mA) 5 2934 G05 3.2 0 –0.4 –0.6 –0.8 –0.2 PULL-DOWN CURRENT (mA) –1 2934 G06 2934f 4 LTC2934 TYPICAL PERFORMANCE CHARACTERISTICS Supply Current vs RT Input Voltage Supply Current vs MR Input Voltage 5 VCC = 3.6V 200 4 150 3 ICC (μA) ICC (μA) 250 TA = 25°C, unless otherwise noted. 100 50 VCC = 3.6V 2 1 0 0 0.5 1 1.5 2 2.5 3 RT INPUT VOLTAGE (V) 3.5 4 2934 G07 0 0 0.5 1 1.5 2 2.5 3 MR INPUT VOLTAGE (V) 3.5 4 2934 G08 PIN FUNCTIONS ADJ: Reset Threshold Adjustment Input. Tie to resistive divider between monitored voltage and GND to configure desired reset threshold. See the Applications Information section for details. Tie to VCC if unused. Exposed Pad (DFN Only): Exposed Pad may be left floating or connected to device ground. GND: Device Ground. MR: Manual Reset Input. Attach a push-button switch between this input and ground. A logic low on this input pulls RST low. When the MR input returns to logic high, RST returns high after the reset timer has expired. Tie to VCC if unused. PFI: Power-Fail Threshold Adjustment Input. Tie to resistive divider between monitored voltage and GND to configure desired power-fail threshold. See the Applications Information section for details. Tie to VCC or GND if unused. PFO: Power-Fail Output. PFO pulls low when monitored voltage falls below the power-fail (PFI) threshold. PFO is released when the PFI voltage rises above the powerfail threshold by 2.5%. PFO is available with open-drain (LTC2934-1) or active pull-up (LTC2934-2) outputs. Leave open if unused. RST: Reset Output. RST pulls low when monitored voltage falls below the reset threshold. RST is released after monitored voltage exceeds the reset threshold plus 5% hysteresis and after reset timer has expired. RST is available with open-drain (LTC2934-1) or active pull-up (LTC2934-2) outputs. Leave open if unused. RT: Reset Timeout Selection Input. Tie to GND or VCC for desired reset timeout. Tie low for 15ms delay or high for 200ms delay. VCC : Power Supply Input. Bypass VCC with 0.1μF to GND. 2934f 5 LTC2934 BLOCK DIAGRAM MR VCC RT LTC2934-2 OPTION VCC 900k – ADJ RST RC RESET DELAY + LTC2934-2 OPTION VCC 0.4V + PC PFO – PFI GND 2934 BD TIMING DIAGRAM PFI / PFO Timing VTH+HYST VTH VPFI PFO 2935 TD01 ADJ / RST Timing VTH+HYST VTH VADJ t RST t RST RST MR 2935 TD02 t PD 2934f 6 LTC2934 APPLICATIONS INFORMATION VOLTAGE MONITORING Threshold Configuration Unmanaged power can cause various system problems. At power-up, voltage fluctuation around critical thresholds can cause improper system or processor initialization. The LTC2934 provides power management capabilities for the system power-up phase. The supervisory device issues a system reset after the monitored voltage has stabilized. Built-in hysteresis and filtering ensures that fluctuations due to load transients or supply noise do not cause chattering of the status outputs. Comparator undervoltage glitch immunity is shown in the Typical Performance Characteristics section. The curve demonstrates the transient amplitude and width required to switch the comparators. The LTC2934 monitors voltage applied to its inputs PFI and ADJ. A resistive divider connected between a monitored voltage and ground is used to bias the inputs. Figure 1 demonstrates how the monitor inputs can be made dependent upon a single voltage (V1). Only three resistors are required. To calculate their values, specify desired falling power fail (VPF) and reset voltages (VR) with VPF > VR. For example: Because many batteries exhibit large series resistance, load currents can cause significant voltage drops. The low DC current draw of the LTC2934 (at any input voltage) does not add to the loading problem. When voltage is initially applied to VCC, RST and PFO pull low once there is enough voltage to turn on the pull-down devices (1V maximum). VPF = 1.72V, VR = 1.62V V1 R3 ADJ LTC2934 R2 PFI R1 2934 F01 Figure 1. Configuration for Single Voltage Monitoring If the monitored supply voltage falls to the power-fail threshold, the built-in power-fail comparator pulls PFO low. PFO remains low until the PFI input rises above 0.4V plus 2.5% hysteresis. PFO is typically used to signal preparation for controlled shutdown. For example, the PFO output may be connected to a processor nonmaskable interrupt. Upon interrupt, the processor begins shutdown procedures such as supply sequencing and/or storage/erasure of system state in nonvolatile memory. The solution for R1, R2, and R3 provides three equations and three unknowns. Maximum resistor size is governed by maximum input leakage current. For the LTC2934, the maximum input leakage current over temperature is 1nA. For a maximum error of 1% due to both input currents, the resistor divider current should be 100 times the sum of the leakage currents, or 0.2μA. At the reset threshold, V1 = 1.62V, so RSUM = V1/0.2μA = 8.1M where: If the monitored voltage drops below the reset threshold, RST pulls low until the ADJ input rises above 0.4V plus 5% hysteresis. This may occur through battery charging or replacement. An internal reset timer delays the return of the RST output to a high state to provide settling and initialization time. The RST output is typically connected to processor reset input. The falling monitor thresholds (VTH) are 0.4 volts, so: Few, if any external components are necessary for reliable operation. However, a decoupling capacitor between VCC and ground is recommended (0.01μF minimum). RSUM = R1 + R2 + R3 R1 = VTH • R SUM 0 . 4V • 8 . 1M = = 1 . 88M VPF 1 . 72V The closest 1% value is 1.87M. R2 can be determined from: VTH • R SUM 0 . 4V • 8 . 1M – R1 = − 1 . 87M VR 1 . 62V R2 = 130k R2 = 2934f 7 LTC2934 APPLICATIONS INFORMATION R3 is easily obtained from: Selecting Output Logic Style R3 = RSUM – R1 – R2 = 8.1M – 1.87M – 130k = 6.1M The closest 1% value is 6.04M. Plugging the standard values back into the equations yields the design values for the falling power-fail and reset voltages: VPF = 1.720V, VR = 1.608V Figure 2 demonstrates how the inputs can be biased to monitor two voltages (V1, V2). In this example, four resistors are required. Calculate each divider ratio for the desired falling threshold (VFT) using: RnB VFT V = − 1 = FT − 1 0 . 4V RnA VTH In Figure 2, PFO is tied back to the MR input, making the state of the RST output dependent upon both V1 and V2. If V1 and V2 are both above the configured falling threshold plus hysteresis, RST is allowed to pull high. If independent operation of the status outputs is desired, simply omit the PFO to MR connection. R1B ADJ V1 RST LTC2934 R2B PFO PFI V2 R2A R1A 2934 F02 MR Figure 2. Dual Voltage Monitoring 3.5 Some applications require the RST and/or PFO outputs to be valid with VCC down to ground. Active pull-up handles this requirement with the addition of an external resistor from the output to ground. The resistor provides a path for leakage currents, preventing the output from floating to undetermined voltages when connected to high impedance (such as CMOS logic inputs). The resistor value should be small enough to provide effective pull-down without excessively loading the pull-up circuitry. A 100k resistor from output to ground is satisfactory for most applications. When the status outputs are high, power is dissipated in the pull-down resistors. Figure 4 demonstrates typical LTC2934-2 RST output behavior. 3.5 LTC2934-2 3.0 EXTERNALLY CONFIGURED FOR 3V FALLING THRESHOLD EXTERNALLY CONFIGURED FOR 3V FALLING THRESHOLD 2.5 RST (V) 2.5 RST (V) The active pull-up option (LTC2934-2) eliminates the need for external pull-up resistors on the status outputs. Integrated pull-up devices pull the outputs up to VCC. Actively pulled up outputs may not be driven above VCC. LTC2934-1 3.0 2.0 1.5 2.0 1.5 1.0 1.0 0.5 0.5 0 0 0 0.5 1 1.5 2 VCC (V) 2.5 3 3.5 2934 F03 Figure 3. RST vs VCC with 10k Pull-Up 8 The LTC2934 status outputs are available in two options: open-drain (LTC2934-1) or active pull-up (LTC2934-2). The open-drain option (LTC2934-1) allows the outputs to be pulled up to a user defined voltage with a resistor. The open-drain pull-up voltage may be greater than VCC (5.5V maximum), which is not always possible with inferior battery supervisors, due to internal diode clamps. When the status outputs are low, power is dissipated in the pull-up resistors. Recommended resistor values lie in the range between 10k and 470k. Figure 3 demonstrates typical LTC2934-1 RST output behavior. 0 0.5 1 1.5 2 2.5 VCC (V) Figure 4. RST vs VCC 3 3.5 2934 F04 2934f LTC2934 APPLICATIONS INFORMATION Manual Reset Input When VCC is above its reset threshold, and the manual reset input (MR) is pulled low, the RST output is forced low. RST remains low for the selected reset timeout period after the manual reset input is released and pulled high. The manual reset input is pulled up internally through 900k to VCC. If external leakage currents have the ability to pull down the manual reset input below its logic threshold, a lower value pull-up resistor, placed between VCC and MR will fix the problem. Input MR is often pulled down through a pushbutton switch requiring human contact. If extended ESD toler- ance is required, series resistance between the switch and the input is recommended. For most applications a 10k resistor provides sufficient current limiting. Selecting the Reset Timeout Period Use the RT input to select between two fixed reset timeout periods. Connect RT to ground for a 15ms timeout. Connect RT to VCC for a 200ms timeout. The reset timeout period occurs after the ADJ input is driven above threshold. After the reset timeout period, the RST output is allowed to pull up to a high state. TYPICAL APPLICATIONS Battery Monitor with Interface to Low Voltage Logic 3μA LDO IN SHDN LT3009 OUT GND ADJ 1.8V 1.18M 0.1μF 1μF 590k + 698k RT ADJ PFI 100k 100k VDD VCC 324k Li-Ion 100k 100k PFO NMI LTC2934-1 μP RESD* 10k RST MR RST GND PB1 Alkaline Cell Stack Voltage Monitor VCC 845k + + + MR Coin Cell Voltage Monitor 0.1μF VCC RT 1.5V 12.7k 1.5V 154k LTC2934-2 845k PFO RST PFI GND LOW BATTERY + LTC2934-2 ADJ CR2032 0.1μF PFO LOW BATTERY RST SYSTEM RESET 10k SYSTEM RESET PFI 147k 2934 TA03 POWER FAIL THRESHOLD = 2.628V RESET THRESHOLD = 2.428V MR RT 1.5V ADJ 2934 TA02 POWER FAIL FALLING THRESHOLD = 3.192V RESET FALLING THRESHOLD = 1.696V *OPTIONAL RESISTOR FOR ADDED ESD PROTECTION GND 2934 TA04 POWER FAIL THRESHOLD = 2.727V RESET THRESHOLD = 2.553V 2934f 9 LTC2934 PACKAGE DESCRIPTION DC Package 8-Lead Plastic DFN (2mm × 2mm) (Reference LTC DWG # 05-08-1719 Rev Ø) 0.70 ±0.05 2.55 ±0.05 1.15 ±0.05 0.64 ±0.05 (2 SIDES) PACKAGE OUTLINE 0.25 ± 0.05 0.45 BSC 1.37 ±0.05 (2 SIDES) RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS APPLY SOLDER MASK TO AREAS THAT ARE NOT SOLDERED R = 0.05 TYP 2.00 ±0.10 (4 SIDES) PIN 1 BAR TOP MARK (SEE NOTE 6) R = 0.115 TYP 5 8 0.40 ± 0.10 0.64 ± 0.10 (2 SIDES) PIN 1 NOTCH R = 0.20 OR 0.25 × 45° CHAMFER (DC8) DFN 0106 REVØ 4 0.200 REF 1 0.23 ± 0.05 0.45 BSC 0.75 ±0.05 1.37 ±0.10 (2 SIDES) 0.00 – 0.05 BOTTOM VIEW—EXPOSED PAD NOTE: 1. DRAWING IS NOT A JEDEC PACKAGE OUTLINE 2. DRAWING NOT TO SCALE 3. ALL DIMENSIONS ARE IN MILLIMETERS 4. DIMENSIONS OF EXPOSED PAD ON BOTTOM OF PACKAGE DO NOT INCLUDE MOLD FLASH. MOLD FLASH, IF PRESENT, SHALL NOT EXCEED 0.15mm ON ANY SIDE 5. EXPOSED PAD SHALL BE SOLDER PLATED 6. SHADED AREA IS ONLY A REFERENCE FOR PIN 1 LOCATION ON THE TOP AND BOTTOM OF PACKAGE 2934f 10 LTC2934 PACKAGE DESCRIPTION TS8 Package 8-Lead Plastic TSOT-23 (Reference LTC DWG # 05-08-1637) 0.52 MAX 2.90 BSC (NOTE 4) 0.65 REF 1.22 REF 1.4 MIN 3.85 MAX 2.62 REF 2.80 BSC 1.50 – 1.75 (NOTE 4) PIN ONE ID RECOMMENDED SOLDER PAD LAYOUT PER IPC CALCULATOR 0.22 – 0.36 8 PLCS (NOTE 3) 0.65 BSC 0.80 – 0.90 0.20 BSC 0.01 – 0.10 1.00 MAX DATUM ‘A’ 0.30 – 0.50 REF 0.09 – 0.20 (NOTE 3) 1.95 BSC TS8 TSOT-23 0802 NOTE: 1. DIMENSIONS ARE IN MILLIMETERS 2. DRAWING NOT TO SCALE 3. DIMENSIONS ARE INCLUSIVE OF PLATING 4. DIMENSIONS ARE EXCLUSIVE OF MOLD FLASH AND METAL BURR 5. MOLD FLASH SHALL NOT EXCEED 0.254mm 6. JEDEC PACKAGE REFERENCE IS MO-193 2934f Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no representation that the interconnection of its circuits as described herein will not infringe on existing patent rights. 11 LTC2934 TYPICAL APPLICATION Portable Device Battery Monitor 3μA LDO 1.8V IN 0.1μF + 866k Li-Ion VCC RT 100k SHDN LT3009 OUT GND ADJ 1.18M 1μF RST ADJ LTC2934-1 6.34k 100k 590k PFI 127k MR GND LOW BATTERY EARLY WARNING PFO 2934 TA05 POWER FAIL FALLING THRESHOLD = 3.148V RESET FALLING THRESHOLD = 2.998V RELATED PARTS PART NUMBER DESCRIPTION COMMENTS LTC690 5V Supply Monitor, Watchdog Timer and Battery Backup 4.65V Threshold LTC694-3.3 3.3V Supply Monitor, Watchdog Timer and Battery Backup 2.9V Threshold LTC1232 5V Supply Monitor, Watchdog Timer and Pushbutton Reset 4.37V/4.62V Threshold LTC1326 Micropower Triple Supply Monitor for 5V/2.5V, 3.3V and ADJ 4.725V, 3.118V, 1V Threshold (±0.75%) and ADJ LTC1726 Micropower Triple Supply Monitor for 2.5V/5V, 3.3V and ADJ Adjustable Reset and Watchdog Timeouts LTC1727 Micropower Triple Supply Monitor with Open-Drain Reset Individual Monitor Outputs in MSOP LTC1728 Micropower Triple Supply Monitor with Open-Drain Reset 5-Lead SOT-23 Package LTC1985 Micropower Triple Supply Monitor with Push-Pull Reset Output 5-Lead SOT-23 Package LTC2900 Programmable Quad Supply Monitor Adjustable Reset, 10-Lead MSOP and DFN Packages LTC2901 Programmable Quad Supply Monitor Adjustable Reset and Watchdog Timer LTC2902 Programmable Quad Supply Monitor Adjustable Reset and Tolerance LTC2903 Precision Quad Supply Monitor 6-Lead SOT-23 Package LTC2904/LTC2905/ LTC2906/LTC2907 Three-State Programmable Precision Dual Supply Monitor 8-Lead SOT-23 and DFN Packages LTC2908 Precision Six-Supply Monitor (Four Fixed and Two Adjustable) 8-Lead TSOT-23 and DFN Packages LTC2909 Precision Triple/Dual Input UV, OV and Negative Voltage Monitor Shunt Regulated VCC Pin, Adjustable Threshold and Reset, 8-Lead SOT-23 and DFN Packages LTC2910 Octal Positive/Negative Voltage Monitor Separate VCC Pin, Eight Inputs, Up to Two Negative Monitors Adjustable Reset Timer, 16-Lead SSOP and DFN Packages LTC2912/LTC2913/ LTC2914 Single/Dual/Quad UV and OV Voltage Monitors Separate VCC Pin, Adjustable Reset Timer LTC2915/LTC2916/ LTC2917/LTC2918 Single Voltage Supervisors with 27 Pin-Selectable Thresholds Manual Reset and Watchdog Functions, 8- and 10-Lead TSOT-23, MSOP and DFN Packages LTC2935 Ultralow Power Supervisor with Eight Pin-Selectable Thresholds 500nA Quiescent Current, 2mm × 2mm 8-Lead DFN and TSOT-23 Packages 2934f 12 Linear Technology Corporation LT 0508 • PRINTED IN USA 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com © LINEAR TECHNOLOGY CORPORATION 2008