LTC2935ITS8-1-TRMPBF

FEATURES n n n n n n n n n LTC2935 Ultra-Low Power Supervisor with Power-Fail Output, Selectable Thresholds DESCRIPTION The LTC®2935 ultra-low power voltage monitor provides system initialization, power-fail warning and reset generation functions. Low quiescent current (500nA typical) makes the LTC2935 an ideal choice for battery-operated applications. Three binary threshold-select inputs configure one of eight integrated reset thresholds, available from 3.3V to 2.25V in 150mV increments. Early warning of an impending low voltage condition is provided at the power-fail output (PFO), whose threshold is 150mV above the configured reset threshold. Supervisory circuits monitor VCC and pull RST low when VCC drops below the configured reset threshold. When VCC is rising from an under-threshold condition, an internal reset timer is started after exceeding the reset threshold by 5%. A 200ms 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 (LTC2935-1) or active pull-up (LTC2935-2) circuits. Operating temperature range is from –40ºC to 85ºC. 500nA Quiescent Current ±1.5% (Max) Accuracy over Temperature Integrated Precision Attenuators Eight Pin-Selectable Reset Thresholds Eight Pin-Selectable Power-Fail Thresholds Early Warning Power-Fail Output 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. TYPICAL APPLICATION Configurable Low Power Voltage Monitor VIN VCC 0.1μF S2 S1 S0 MR GND 2935 TA01a Falling Threshold Selection Table RESET POWER-FAIL THRESHOLD THRESHOLD (V) (V) S2 Low Low Low Low High High High High S1 Low Low High High High Low Low High S0 Low High High Low Low Low High High PFO LTC2935-2 BATTERY POWERED SYSTEM LOGIC RST 3.30 3.15 3.00 2.85 2.70 2.55 2.40 2.25 3.45 3.30 3.15 3.00 2.85 2.70 2.55 2.40 2935f 1 LTC2935 ABSOLUTE MAXIMUM RATINGS (Notes 1, 2) Input Voltages VCC........................................................... –0.3V to 6V S2, S1, S0, MR .........................–0.3V to (VCC + 0.3V) Output Voltages PFO, RST (LTC2935-1)............................. –0.3V to 6V PFO, RST (LTC2935-2)..............–0.3V to (VCC + 0.3V) RMS Currents PFO, RST ..........................................................±5mA Operating Ambient Temperature Range LTC2935C ................................................ 0°C to 70°C LTC2935I.............................................. –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 VCC 1 MR 2 RST 3 PFO 4 9 8 S2 7 S1 6 S0 5 GND S2 1 S1 2 S0 3 GND 4 TOP VIEW 8 VCC 7 MR 6 RST 5 PFO DC PACKAGE 8-LEAD (2mm × 2mm) PLASTIC DFN TJMAX = 125°C, θJA = 102°C/W EXPOSED PAD (PIN 9), PCB GND CONNECTION OPTIONAL TS8 PACKAGE 8-LEAD PLASTIC TSOT-23 TJMAX = 125°C, θJA = 195°C/W ORDER INFORMATION Lead Free Finish TAPE AND REEL (MINI) TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION 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 LTC2935CTS8-1#TRMPBF LTC2935CTS8-1#TRPBF LTDPW 8-Lead Plastic TSOT-23 LTC2935ITS8-1#TRMPBF LTC2935ITS8-1#TRPBF LTDPW 8-Lead Plastic TSOT-23 LTC2935CTS8-2#TRMPBF LTC2935CTS8-2#TRPBF LTDQB 8-Lead Plastic TSOT-23 LTC2935ITS8-2#TRMPBF LTC2935ITS8-2#TRPBF LTDQB 8-Lead Plastic TSOT-23 LTC2935CDC-1#TRMPBF LTC2935CDC-1#TRPBF LDPX 8-Lead (2mm × 2mm) Plastic DFN LTC2935IDC-1#TRMPBF LTC2935IDC-1#TRPBF LDPX 8-Lead (2mm × 2mm) Plastic DFN LTC2935CDC-2#TRMPBF LTC2935CDC-2#TRPBF LDQC 8-Lead (2mm × 2mm) Plastic DFN LTC2935IDC-2#TRMPBF LTC2935IDC-2#TRPBF LDQC 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/ 2935f 2 LTC2935 ELECTRICAL CHARACTERISTICS SYMBOL VCC ICC Reset Thresholds VRTF1 VRTF2 VRTF3 VRTF4 VRTF5 VRTF6 VRTF7 VRTF8 ΔVRTF VRT(HYST) tUVR ΔVPFT VPFT(HYST) tUVP VIN(TH) tPW tPD RPU ILK VOL Reset Threshold 1 (VCC Falling) Reset Threshold 2 (VCC Falling) Reset Threshold 3 (VCC Falling) Reset Threshold 4 (VCC Falling) Reset Threshold 5 (VCC Falling) Reset Threshold 6 (VCC Falling) Reset Threshold 7 (VCC Falling) Reset Threshold 8 (VCC Falling) Reset Threshold Differential VRTF(N+1) – VRTF(N) Reset Threshold Hysteresis (VCC Rising) Undervoltage Detect to RST Falling Power-Fail Threshold Differential VPFT(N) – VRTF(N) Power-Fail Threshold Hysteresis Undervoltage Detect to PFO Falling Control Input Threshold Input Pulse Width Propagation Delay to RST Falling Internal Pull-Up Resistance Input Leakage Current Voltage Output Low S2 = Low : S1 = Low : S0 = Low S2 = Low : S1 = Low : S0 = High S2 = Low : S1 = High : S0 = High S2 = Low : S1 = High : S0 = Low S2 = High : S1 = High : S0 = Low S2 = High : S1 = Low : S0 = Low S2 = High : S1 = Low : S0 = High S2 = High : S1 = High : S0 = High (Note 3) Relative to Any Selected Reset Threshold VCC Below Threshold by 1% (Note 3) Any Selected Reset Threshold (VCC Falling) Relative to Any Selected Power-Fail Threshold (VCC Rising) VCC Below Threshold by 1% (Note 3) S2, S1, S0 MR MR Manual Reset Falling MR S2, S1, S0 = VCC or GND VCC = 1V, 200μA Pull-Up Current VCC = 3V, 3mA Pull-Up Current S2, S1, S0 = Low –200μA Pull-Down Current l l l l l l l l l l l l l l l l l l l l l l l 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) PARAMETER VCC Input Supply Voltage VCC Input Supply Current CONDITIONS l l MIN 225 3.251 3.103 2.955 2.808 2.660 2.512 2.364 2.217 142 4.5 TYP 500 3.300 3.150 3.000 2.850 2.700 2.550 2.400 2.250 150 5 1 MAX 5.5 1000 3.349 3.197 3.045 2.892 2.740 2.588 2.436 2.283 158 6 UNITS V nA V V V V V V V V mV % ms Power-Fail Thresholds 100 2 150 2.5 1 0.3 • VCC 0.4 20 2 600 5 900 ±1 25 50 0.7 • VCC ±1 140 200 ±10 260 20 1200 ±10 100 150 0.7 • VCC 1.4 200 3.5 mV % ms V V μs μs kΩ nA mV mV V nA ms Control Inputs: MR, S2, S1, S0 Reset and Power-Fail Outputs: RST, PFO VOH IOH tRST Voltage Output High (LTC2935-2) Reset Timeout Period Current Output High, Leakage (LTC2935-1) VRST, VPFO = 3.6V 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. 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. 2935f 3 LTC2935 TYPICAL PERFORMANCE CHARACTERISTICS Supply Current vs Supply Voltage 1000 S0 = S1 = S2 = GND NORMALIZED THRESHOLD (V/ V) 85°C 1.015 1.010 1.005 1.000 0.995 0.990 0.985 –50 TA = 25°C, unless otherwise noted. Normalized Reset and Power-Fail Thresholds vs Temperature 800 ICC (nA) 600 25°C –40°C 400 200 0 0 1 2 3 VCC (V) 4 5 6 2935 G01 –25 0 25 50 TEMPERATURE (°C) 75 100 2935 G02 Comparator Undervoltage Glitch Immunity 3.0 2.5 2.0 1.5 1.0 0.5 0 0.1 VCC = 3.6V 260 240 220 tRST (ms) 200 180 160 Reset Timeout Period vs Temperature VCC = 3.6V GLITCH DURATION, t UV (ms) COMPARATORS PULL DOWN ABOVE CURVE 1 10 COMPARATOR OVERDRIVE (%) 100 2935 G03 140 –50 –25 0 25 50 TEMPERATURE (°C) 75 100 2935 G04 Voltage Output Low vs Pull-Up Current (RST, PFO) 100 3.6 VCC = 3V 85°C 3.5 25°C VOL (mV) VOH (mV) 60 –40°C 40 Voltage Output High vs Pull-Down Current (RST, PFO) LTC2935-2 VCC = 3.6V 80 –40°C 3.4 25°C 3.3 20 85°C 0 3.2 0 1 2 3 4 PULL-UP CURRENT (mA) 5 2935 G05 0 –0.4 –0.6 –0.8 –0.2 PULL-DOWN CURRENT (mA) –1 2935 G06 2935f 4 LTC2935 TYPICAL PERFORMANCE CHARACTERISTICS Supply Current vs S0, S1, S2 Input Voltage 250 VCC = 3.6V 5 TA = 25°C, unless otherwise noted. Supply Current vs MR Input Voltage VCC = 3.6V 200 4 ICC (μA) ICC (μA) 150 3 100 2 50 1 0 0 0.5 1 1.5 2 2.5 3 3.5 4 2935 G07 0 0 0.5 1 1.5 2 2.5 3 3.5 4 2935 G08 S0, S1, S2 INPUT VOLTAGE (V) MR INPUT VOLTAGE (V) PIN FUNCTIONS Exposed Pad (DFN Only): Exposed Pad may be left floating or connected to device ground. GND: Device ground. MR: Manual Reset Input. Attach a pushbutton 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 200ms. Tie to VCC if unused. PFO: Power-Fail Output. PFO pulls low when VCC falls below the power-fail threshold. The power-fail threshold is 150mV above the configured falling reset threshold. PFO is released when VCC rises above the power-fail threshold by 2.5%. PFO is available with open-drain (LTC2935-1) or active pull-up (LTC2935-2) outputs. Leave open if unused. RST: Reset Output. RST pulls low when VCC falls below the reset threshold. RST is released 200ms after VCC exceeds the reset threshold plus 5% hysteresis. RST is available with open-drain (LTC2935-1) or active pull-up (LTC2935-2) outputs. Leave open if unused. S2, S1, S0: Threshold Selection Inputs. Tie to GND or VCC for required reset threshold. See the Falling Threshold Selection Table on page 1 for settings. VCC: Power Supply and Monitored Voltage Input. Bypass VCC with a 0.1μF capacitor to GND. 2935f 5 LTC2935 BLOCK DIAGRAM MR VCC 900k LTC2935-2 VCC RC RESET DELAY RST S0 S1 S2 0.4V TIMING DIAGRAM VPFT VRTF VCC PFO t RST t RST RST MR 2935 TD t PD 6 + LTC2935-2 VCC PC PFO + – – GND 2935 BD 2935f LTC2935 APPLICATIONS INFORMATION VOLTAGE MONITORING Unmanaged power can cause various system problems. At power-up, voltage fluctuation around critical thresholds can cause improper system or processor initialization. The LTC2935 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. Because many batteries exhibit large series resistance, load currents can cause significant voltage drops. The low DC current draw of the LTC2935 (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). If the monitored supply voltage falls to the power-fail threshold, the built-in power-fail comparator pulls PFO low. At this point, there remains 150mV of voltage margin before the RST output pulls low. PFO remains low until VCC rises above the power-fail threshold 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 may begin shutdown procedures. Shutdown events may include supply sequencing and/or storage/erasure of system state in nonvolatile memory. If the monitored voltage drops below the reset threshold, RST pulls low until VCC rises above the reset threshold 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 a processor reset input. Few, if any external components are necessary for reliable operation. However, a decoupling capacitor between VCC and ground is recommended (0.01μF minimum). Threshold Configuration The LTC2935 monitors and compares the VCC voltage against two internal thresholds during operation. The higher threshold (power-fail) is the level used for early warning of a low voltage condition, reported on the PFO output. The lower threshold (reset) is the level at which the RST output pulls low. Use system requirements to choose the appropriate reset threshold from Table 1. The power-fail threshold is always 150mV higher than the configured reset threshold. Set the threshold selection inputs (S2, S1, S0) accordingly. Table 1. Falling Threshold Selection RESET THRESHOLD (V) 3.30 3.15 3.00 2.85 2.70 2.55 2.40 2.25 POWER-FAIL THRESHOLD (V) 3.45 3.30 3.15 3.00 2.85 2.70 2.55 2.40 S2 Low Low Low Low High High High High S1 Low Low High High High Low Low High S0 Low High High Low Low Low High High 2935f 7 LTC2935 APPLICATIONS INFORMATION Selecting Output Logic Style The LTC2935 status outputs are available in two options: open-drain (LTC2935-1) or active pull-up (LTC2935-2). The open-drain option (LTC2935-1) 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 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 1 demonstrates typical LTC2935-1 RST output behavior. The active pull-up option (LTC2935-2) 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. 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 2 demonstrates typical LTC2935-2 RST output behavior. 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 200ms 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 tolerance is required, series resistance between the switch and the input is recommended. For most applications, a 10k resistor provides sufficient current limiting. LTC2935-1 S2 = GND 3.0 S1 = S0 = V CC 2.5 RST (V) 2.0 1.5 1.0 0.5 0 0 0.5 1 1.5 2 2.5 3 3.5 2935 F01 3.5 LTC2935-2 S2 = GND 3.0 S1 = S0 = V CC 2.5 RST (V) 2.0 1.5 1.0 0.5 0 0 0.5 1 1.5 2 2.5 3 3.5 2935 F02 3.5 VCC (V) VCC (V) Figure 1. RST vs VCC with 10k Pull-Up Figure 2. RST vs VCC 2935f 8 LTC2935 TYPICAL APPLICATIONS Battery Monitor with Interface to Low Voltage Logic 3μA LDO IN SHDN LT3009 GND OUT ADJ 1.18M 1μF 590k VCC 100k 100k VDD PFO LTC2935-1 NMI μP 1.8V + Li-Ion 0.1μF S0 S1 S2 RESD* 10k MANUAL PB1 RESET PUSHBUTTON MR GND RST RST 2935 TA02 POWER FAIL FALLING THRESHOLD = 3.15V RESET FALLING THRESHOLD = 3.00V *OPTIONAL RESISTOR FOR ADDED ESD PROTECTION Alkaline Cell Stack Voltage Monitor VCC MR PFO LOW BATTERY + + + 1.5V 0.1μF S0 S2 S1 LTC2935-2 1.5V RST 1.5V GND 2935 TA03 SYSTEM RESET POWER FAIL FAIL THRESHOLD = 2.55V RESET THRESHOLD = 2.40V Coin Cell Voltage Monitor VCC MR PFO LOW BATTERY + CR2032 0.1μF S2 S1 S0 GND LTC2935-2 RST SYSTEM RESET 2935 TA04 POWER FAIL FAIL THRESHOLD = 2.70V RESET THRESHOLD = 2.55V 2935f 9 LTC2935 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) R = 0.115 TYP 5 8 0.40 ± 0.10 PIN 1 NOTCH R = 0.20 OR 0.25 × 45° CHAMFER (DC8) DFN 0106 REVØ PIN 1 BAR TOP MARK (SEE NOTE 6) 0.64 ± 0.10 (2 SIDES) 4 0.200 REF 0.75 ± 0.05 1.37 ± 0.10 (2 SIDES) 0.00 – 0.05 0.23 ± 0.05 0.45 BSC 1 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 2935f 10 LTC2935 PACKAGE DESCRIPTION TS8 Package 8-Lead Plastic TSOT-23 (Reference LTC DWG # 05-08-1637) 0.52 MAX 0.65 REF 2.90 BSC (NOTE 4) 1.22 REF 3.85 MAX 2.62 REF 1.4 MIN 2.80 BSC 1.50 – 1.75 (NOTE 4) PIN ONE ID RECOMMENDED SOLDER PAD LAYOUT PER IPC CALCULATOR 0.65 BSC 0.22 – 0.36 8 PLCS (NOTE 3) 0.80 – 0.90 0.20 BSC 1.00 MAX DATUM ‘A’ 0.01 – 0.10 0.30 – 0.50 REF 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 0.09 – 0.20 (NOTE 3) 1.95 BSC TS8 TSOT-23 0802 2935f 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 LTC2935 TYPICAL APPLICATION Portable Device Battery Monitor 3μA LDO 1.8V IN VCC Li-Ion 0.1μF S0 S1 S2 LTC2935-1 RST 590k MR 100k SHDN LT3009 GND OUT ADJ 1.18M 1μF 100k + GND PFO POWER FAIL FALLING THRESHOLD = 3.15V RESET FALLING THRESHOLD = 3.00V 2935 TA05 LOW BATTERY EARLY WARNING RELATED PARTS PART NUMBER LTC690 LTC694-3.3 LTC1232 LTC1326 LTC1726 LTC1727 LTC1728 LTC1985 LTC2900 LTC2901 LTC2902 LTC2903 LTC2904/LTC2905/ LTC2906/LTC2907 LTC2908 LTC2909 LTC2910 LTC2912/LTC2913/ LTC2914 LTC2915/LTC2916/ LTC2917/LTC2918 LTC2934 DESCRIPTION 5V Supply Monitor, Watchdog Timer and Battery Backup 3.3V Supply Monitor, Watchdog Timer and Battery Backup 5V Supply Monitor, Watchdog Timer and Pushbutton Reset Micropower Triple Supply Monitor for 5V/2.5V, 3.3V and ADJ Micropower Triple Supply Monitor for 2.5V/5V, 3.3V and ADJ Micropower Triple Supply Monitor with Open-Drain Reset Micropower Triple Supply Monitor with Open-Drain Reset Micropower Triple Supply Monitor with Push-Pull Reset Output Programmable Quad Supply Monitor Programmable Quad Supply Monitor Programmable Quad Supply Monitor Precision Quad Supply Monitor Three-State Programmable Precision Dual Supply Monitor Precision Six-Supply Monitor (Four Fixed and Two Adjustable) Precision Triple/Dual Input UV, OV and Negative Voltage Monitor Octal Positive/Negative Voltage Monitor Single/Dual/Quad UV and OV Voltage Monitors Single Voltage Supervisors with 27 Pin-Selectable Thresholds Ultralow Power Supervisor with Power-Fail Output COMMENTS 4.65V Threshold 2.9V Threshold 4.37V/4.62V Threshold 4.725V, 3.118V, 1V Threshold (±0.75%) and ADJ Adjustable Reset and Watchdog Timeouts Individual Monitor Outputs in MSOP 5-Lead SOT-23 Package 5-Lead SOT-23 Package Adjustable Reset, 10-Lead MSOP and DFN Packages Adjustable Reset and Watchdog Timer Adjustable Reset and Tolerance 6-Lead SOT-23 Package 8-Lead SOT-23 and DFN Packages 8-Lead TSOT-23 and DFN Packages Shunt Regulated VCC Pin, Adjustable Threshold and Reset, 8-Lead SOT-23 and DFN Packages Separate VCC Pin, Eight Inputs, Up to Two Negative Monitors Adjustable Reset Timer, 16-Lead SSOP and DFN Packages Separate VCC Pin, Adjustable Reset Timer Manual Reset and Watchdog Functions 500nA Quiescent Current, 2mm × 2mm 8-Lead DFN and TSOT-23 Packages, Adjustable via External Resistors 2935f 12 Linear Technology Corporation (408) 432-1900 ● FAX: (408) 434-0507 ● LT 0508 • PRINTED IN USA 1630 McCarthy Blvd., Milpitas, CA 95035-7417 www.linear.com © LINEAR TECHNOLOGY CORPORATION 2008