DESCRIPTIO Simultaneously Monitors Three Supplies LTC1326: 3.3V L
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LTC1326/LTC1326-2.5 Micropower Precision Triple Supply Monitors
DESCRIPTIO
Simultaneously Monitors Three Supplies LTC1326: 3.3V LTC1326-2.5: 2.5V, 3.3V Guaranteed Threshold Accuracy: ±0.75% Supply Current: 20µA Internal Reset Time Delay: 200ms Manual Push-Button Reset Input Active Active High Reset Outputs Active "Soft" Reset Output Power Supply Glitch Immunity Guaranteed RESET VCC3 VCC5 VCC25 8-Pin MSOP Packages
LTC1326/LTC1326-2.5 triple supply monitors intended systems with multiple supply voltages. They provide micropower operation, small size high accuracy supply monitoring. Tight 0.75% threshold accuracy glitch immunity ensure reliable reset operation without false triggering. 20µA typical supply current makes LTC1326/ LTC1326-2.5 ideal power-conscious systems. output guaranteed correct state VCC3, VCC5 VCC25 down LTC1326/LTC1326-2.5 configured monitor one, three inputs, depending system requirements. manual push-button reset input provides ability generate very narrow "soft" reset pulse (100µs typ) 200ms reset pulse equivalent power-on reset. Both SRST outputs open-drain OR-tied with other reset sources.
registered trademarks Linear Technology Corporation. other trademarks property their respective owners. Protected U.S. Patents, including 4843302.
APPLICATIO
Desktop Computers Notebook Computers Intelligent Instruments Portable Battery-Powered Equipment
TYPICAL APPLICATIO
DC/DC CONVERTER 2.5V 3.3V VCORE
Output Voltage Supply Voltage (LTC1326-2.5)
SYSTEM LOGIC
OUTPUT VOLTAGE
VCC25 VCCA VCC3 4.7k PULL-UP FROM VCC3 25°C
0.1µF
VCC25 VCC3 VCCA LTC1326-2.5 PUSH-BUTTON RESET SRST
VCC3
1326/2.5 TA01
1326/2.5 TA02
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LTC1326/LTC1326-2.5 ABSOLUTE RATI
Terminal Voltage VCC3, VCC5, VCC25, VCCA 0.5V RST, SRST 0.5V 0.5V (VCC3 0.3V)
PACKAGE/ORDER ATIO
VIEW VCC3 VCC5 VCCA SRST
PACKAGE 8-LEAD PLASTIC MSOP TJMAX 125°C, 250°C/W
ORDER PART NUMBER LTC1326CMS8 LTC1326IMS8
VIEW VCC3 VCC25 VCCA
PART NUMBER LTBA LTUH
SRST
PACKAGE 8-LEAD PLASTIC MSOP TJMAX 125°C, 250°C/W
ORDER PART NUMBER
LTC1326CMS8-2.5 LTC1326IMS8-2.5
PART NUMBER
LTEK LTUJ
Order Options Tape Reel: Lead Free: #PBF Lead Free Tape Reel: #TRPBF Lead Free Part Marking: http://www.linear.com/leadfree/
Consult factory parts specified with wider operating temperature ranges.
(Notes
Operating Temperature Range LTC1326C/LTC1326C-2.5 70°C LTC1326I/LTC1326I-2.5 40°C 85°C Storage Temperature Range 65°C 150°C Lead Temperature (Soldering, sec). 300°C
VIEW VCC3 VCC5 VCCA SRST
PACKAGE 8-LEAD PLASTIC TJMAX 125°C, 150°C/W
ORDER PART NUMBER
LTC1326CS8 LTC1326IS8
VIEW VCC3 VCC25 VCCA
PART NUMBER
1326 1326I
SRST
PACKAGE 8-LEAD PLASTIC TJMAX 125°C, 150°C/W
ORDER PART NUMBER
LTC1326CS8-2.5 LTC1326IS8-2.5
PART NUMBER
132625 326I25
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LTC1326/LTC1326-2.5
denotes specifications which apply over full operating temperature range, otherwise specifications 25°C. VCC3 3.3V, VCC5 (for LTC1326),VCC25 2.5V (for LTC1326-2.5), VCCA VCC3, 25°C unless otherwise noted.
SYMBOL VRT3 VRT5 VRT25 VRTA IVCC3 IVCC5 IVCC25 IVCCA tRST PARAMETER Reset Threshold VCC3 Reset Threshold VCC5 (LTC1326) Reset Threshold VCC25 (LTC1326-2.5) Reset Threshold VCCA VCC3 Operating Voltage VCC3 Supply Current VCC5 Input Current (LTC1326) VCC25 Input Current (LTC1326-2.5) VCCA Input Current Reset Pulse Width CONDITIONS 70°C -40°C 85°C 70°C -40°C 85°C 70°C -40°C 85°C 70°C -40°C 85°C Correct Logic State VCC3 VCC5 VCC25 2.5V VCCA with Pull-Up VCC3 70°C -40°C 85°C SRST with Pull-Up VCC3 VCC25, VCC3 VCCA Less Than Reset Threshold More Than 70°C -40°C 85°C
ELECTRICAL CHARACTERISTICS
3.094 3.052 4.687 4.625 2.344 2.312 0.992 0.980
3.118 3.118 4.725 4.725 2.363 2.363 1.000 1.000
3.135 3.143 4.750 4.762 2.375 2.381 1.007 1.007
UNITS
tSRST IPBR
Soft Reset Pulse Width Undervoltage Detect Pull-Up Current
PBR, Input Voltage PBR, Input High Voltage Pulse Width Debounce Assertion Time Transition from Soft Hard Reset Mode Output Voltage Deassertion Input SRST Output (PBR Pulse Width 1µs) Held Less Than 70°C -40°C 85°C ISINK ISINK 100µA, 70°C ISINK 100µA, -40°C 85°C ISINK 100µA, 70°C ISINK 100µA, -40°C 85°C SRST Output Voltage Output Voltage ISINK 2.5mA ISINK 2.5mA VCC3 VCC5 VCC3 VCC5 VCC3 VCC5 VCC3 1.1V, VCC5 VCC3 VCC5 1.1V VCC3 1.1V, VCC5 1.1V VCC3 VCC25 VCC3 VCC25 VCC3 VCC25 VCC3 1.1V, VCC25 VCC3 VCC25 1.1V VCC3 1.1V, VCC25 1.1V
0.15 0.05 0.05 0.05 0.05 0.05 0.05 0.05 0.05 0.05 0.05 0.05 0.05 0.15 0.15
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LTC1326/LTC1326-2.5
denotes specifications which apply over full operating temperature range, otherwise specifications 25°C. LTC1326 Only VCC3 3.3V, VCC5 VCCA VCC3, 25°C unless otherwise noted.
SYMBOL PARAMETER Output Voltage High (Note SRST Output Voltage High (Note Output Voltage High tPHL tPLH VOVR Prop Delay High Input Output Prop Delay Input High Output VCC5 Reset Override Voltage CONDITIONS ISOURCE ISOURCE ISOURCE 600µA CRST 20pF CRST 20pF Override VCC5 Ability Assert (Note
ELECTRICAL CHARACTERISTICS
VCC3 VCC3 VCC3
UNITS
VCC3 ±0.025
Note Stresses beyond those listed under Absolute Maximum Ratings cause permanent damage device. Exposure Absolute Maximum Rating condition extended periods affect device reliability lifetime. Note voltage values with respect GND.
Note output pins SRST have weak internal pull-ups VCC3 typ. However, external pull-up resistors used when faster rise times required. Note VCC5 reset override voltage valid operating range less than approximately 4.15V. Above this point override turned VCC5 functions normally.
TYPICAL PERFOR CHARACTERISTICS
IVCC3 Temperature
IVCC25 (µA) IVCC5 (µA) TEMPERATURE (°C)
IVCC3 (µA)
TEMPERATURE (°C)
1326/2.5
IVCC5 Temperature (LTC1326)
3.00 2.95 2.90 2.85 2.80 2.75 2.70 2.65 2.60 2.55
IVCC25 Temperature (LTC1326-2.5)
2.50 TEMPERATURE (°C)
1326/2.5
1326/2.5
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LTC1326/LTC1326-2.5 TYPICAL PERFOR CHARACTERISTICS
VCCA Input Current Input Voltage
INPUT CURRENT (nA)
25°C TRANSIENT DURATION (µs)
TRANSIENT DURATION (µs)
0.85 0.95 1.05 1.15 INPUT VOLTAGE
1326/2.5
VCCA Transient Immunity
TRANSIENT DURATION (µs)
VCC5 THRESHOLD VOLTAGE, VRT5
0.01 0.001 VCCA RESET COMPARATOR OVERDRIVE
1326/2.5
TRANSIENT DURATION (µs)
RESET OCCURS ABOVE CURVE 25°C
VCC25 Threshold Voltage Temperature (LTC1326-2.5)
2.375
VCC25 THRESHOLD VOLTAGE, VRT25
2.370
3.130 3.125 3.120 3.115 3.110 3.105 3.100
VCCA THRESHOLD VOLTAGE, VRTA
VCC3 THRESHOLD VOLTAGE, VRT3
2.365
2.360
2.355
2.350 TEMPERATURE (°C)
1326/2.5
VCC5 Transient Immunity (LTC1326)
0.001 0.01 VCC5 RESET COMPARATOR OVERDRIVE
1326/2.5
VCC25 Transient Immunity (LTC1326-2.5)
0.01 0.001 VCC25 RESET COMPARATOR OVERDRIVE
1326/2.5
RESET OCCURS ABOVE CURVE 25°C
RESET OCCURS ABOVE CURVE 25°C
VCC3 Transient Immunity
RESET OCCURS ABOVE CURVE 25°C
4.750 4.745 4.740 4.735 4.730 4.725 4.720 4.715 4.710 4.705
VCC5 Threshold Voltage Temperature (LTC1326)
0.01 0.001 VCC3 RESET COMPARATOR OVERDRIVE
1326/2.5
4.700 TEMPERATURE (°C)
1326/2.5
VCC3 Threshold Voltage Temperature
3.135
1.005 1.004 1.003 1.002 1.001 1.000 0.999 0.998 0.997 0.996
VCCA Threshold Voltage Temperature
TEMPERATURE (°C)
1326/2.5
0.995 TEMPERATURE (°C)
1326/2.5
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LTC1326/LTC1326-2.5 TYPICAL PERFOR CHARACTERISTICS
Reset Pulse Width Temperature
SOFT RESET PULSE WIDTH, tSRST (µs)
RESET PULSE WIDTH, tRST (ms)
TEMPERATURE (°C)
110.0 107.5 105.0 102.5 100.0 97.5 95.0 TEMPERATURE (°C)
ASSERTION TIME RESET, (SEC)
FUNCTIONS
VCC3 (Pin 3.3V Sense Input Power Supply Bypass ground with 0.1µF ceramic capacitor. VCC5 (Pin (LTC1326): Sense Input. Used gate drive output when voltage VCC3 less than voltage VCC5. unused, tied VCC3 (see Dual Single Supply Monitor Operation Applications Information section). VCC25 (Pin (LTC1326-2.5): 2.5V Sense Input. Used gate drive output when voltage VCC3 less than voltage VCC25. unused, tied VCC3. VCCA (Pin Sense, High Impedance Input. used logic input with threshold. unused, tied either VCC3 VCC25. (Pin Ground. (Pin Reset Logic Output. Active high CMOS logic output, drives high VCC3, buffered complement RST. external pull-down will drive this high. (Pin Reset Logic Output. Active low, open-drain logic output with weak pull-up VCC3. pulled greater than VCC3 when interfacing logic. Asserted when more supplies below trip thresholds held 200ms after supplies become valid. Also asserted after held more than seconds additional 200ms after released. SRST (Pin Soft Reset. Active low, open-drain logic output with weak pull-up VCC3. pulled greater than VCC3 when interfacing logic. Asserted 100µs after held less than seconds released. (Pin Push-Button Reset. Active logic input with weak pull-up VCC3. pulled greater than VCC3 when interfacing logic. When asserted less than seconds, outputs soft reset 100µs pulse SRST pin. When asserted greater than seconds, output forced remains until 200ms after released.
1326/2.5
"Soft" Reset Pulse Width Temperature
112.5 2.25 2.20 2.15 2.10 2.05 2.00 1.95
Assertion Time Reset Temperature
1.90 TEMPERATURE (°C)
1326/2.5
1326/2.5
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LTC1326/LTC1326-2.5
BLOCK DIAGRA
LTC1326
VCC3 VCC3 TIMER SOFT RESET RESET SRST
POWER DETECT VCC5
4.15V
25mV 25mV
VCC3 VCC3
200ms RESET GENERATOR
VCCA
LTC1326-2.5
VCC3 VCC3 TIMER SOFT RESET RESET SRST
VCC25
POWER DETECT VCC3 VCC3 INTERNAL
200ms RESET GENERATOR
VCC3 VCC25 VCC3
VCCA
VCC3 INTERNAL
VCC3
VCC3
POWER DETECT/ GATE DRIVE
VCC5
VCC3
1326
VCC3
POWER DETECT/ GATE DRIVE
1326-2.5
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LTC1326/LTC1326-2.5
DIAGRA
Monitor Timing
VCCX VRTX tRST
tSRST
1326/2.5 TD01
SRST
APPLICATIO ATIO
Operation
LTC1326/LTC1326-2.5 micropower, high accuracy triple supply monitoring circuits. parts have basic functions: generation reset when power supplies range, generation reset "soft" reset when pulled low. Supply Monitoring three inputs must above predetermined thresholds 200ms before reset output released. parts will assert reset during power-up, power-down brownout conditions more inputs. power-up, either VCC5 VCC3 LTC1326, VCC25 VCC3 LTC1326-2.5, power drive circuits pin. This ensures that will when VCC5, VCC25 VCC3 reaches long inputs below predetermined threshold, will stay logic low. Once inputs rise above their thresholds, internal timer started released after 200ms. outputs inverted state what seen pin. reasserted whenever inputs drops below predetermined threshold remains asserted until 200ms after inputs above their thresholds. power-down, once inputs drop below threshold, held logic low. logic 0.4V guaranteed until VCC3 VCC5 LTC1326 VCC3 VCC25 LTC1326-2.5 drop below
Push-Button Reset Function Timing
tRST
1326/2.5 TD02
three internal precision voltage comparators have response times that typically 13µs. This slow response time helps prevent mistriggering transients each inputs. part's ability suppress transients improved bypassing each inputs with 0.1µF capacitor ground. Push-Button Reset parts provide push-button reset input pin. input internal pull-up current source VCC3. used left floating. When pulled less than sec), narrow (100µs typ) soft reset pulse generated SRST output after button released. pushbutton circuitry contains internal debounce counter which delays output soft reset pulse typically 20ms. This OR-tied issue what called "soft" reset. SRST thereby resets microprocessor without interrupting DRAM refresh cycle. this manner DRAM information remains undisturbed. Alternatively, SRST monitored processor initiate software-controlled reset. When held longer than sec), standard reset generated pins. Once second period elapsed, reset signal produced push-button logic, thereby clearing reset counter. Once button released, reset counter begins counting reset period (200ms nominal). Consequently, reset outputs remain asserted approximately 200ms after button released.
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LTC1326/LTC1326-2.5
APPLICATIO ATIO
During supply induced reset condition, ability force soft reset condition SRST disabled. other words SRST will remain high. held low, both during after supply induced reset (low RST), will remain until 200ms after goes high. Power Detect/Gate Drive LTC1326/LTC1326-2.5 most part powered internally from VCC3 pin. exception gate drive output pin. input this power detection circuitry used detect drive gate from either 3.3V input (VCC3) input (VCC5) LTC1326 2.5V input (VCC25) LTC1326-2.5. gate drive derived from with highest potential. This ensures part pulls soon either input Dual Single Supply Monitor Operation VCC3, VCC5 VCCA inputs individually disabled following override techniques which allow LTC1326 LTC1326-2.5 used dual single supply monitor. LTC1326 Override Functions
VCCA pin, unused, tied either VCC3 VCC5. This obvious solution since trip points VCC3 VCC5 will always greater than trip point VCCA.
OUTPUT VOLTAGE
VCC5 input trip point disabled voltage equal voltage VCC3 ±25mV voltage VCC5 less than 4.15V. this manner, part will behave 3.3V monitor VCC5 reset will disabled. VCC5 trip point reenabled when voltage VCC5 equal voltage VCC3 ±25mV inputs greater than approximately 4.15V. this manner, LTC1326 function monitor with 3.3V monitor disabled. When monitoring either 3.3V with VCC3 strapped VCC5 (see Figure LTC1326 determines which
appropriate range. LTC1326 handles this situation shown Figure Above below VRT3, held low. From VRT3 approximately 4.15V, LTC1326 assumes 3.3V supply monitoring deasserted. Above approximately 4.15V, LTC1326 operates monitor. most systems, supply will pass through 3.1V 4.15V region <200ms during power-up, output will behave desired. Table summarizes state various operating voltages with VCC3 VCC5.
Table Override Truth Table (VCC3 VCC5)
INPUTS (VCC3 VCC5 VCC) VRT3 VRT3 4.15V 4.15V VRT5 VRT5
3.3V ADJUSTABLE SUPPLY
LTC1326 VCC3 VCC5 VCCA SRST 4.7k
SYSTEM RESET
1326/2.5
Figure
VCC3 VCC5 VCCA 4.7k PULL-UP FROM VCC3
SUPPLY VOLTAGE
1326/2.5
Figure Voltage Supply Voltage
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LTC1326/LTC1326-2.5
APPLICATIO ATIO
Figure contains simple circuit systems that can't risk output going high 3.1V 4.15V range (possibly very slow rise time supply). Diode powers LTC1326 while dropping 0.6V from VCC5 VCC3 pin. This prevents part's internal override circuit from being activated. Without override circuit active, stays until VCC5 reaches VRT5 4.725V (See Figure
LTC1326
0.1µF
VCC3 VCC5 VCCA
SRST
4.7k
SYSTEM RESET
*MMBD914 EQUIVALENT
1326/2.5
Figure LTC1326 Monitoring Single Supply. Used Avoid High Near 3.3V (See Figure
VCC5 VCCA 4.7k PULL-UP FROM VCC5 25°C
OUTPUT VOLTAGE
VCC5
1326/2.5
Figure Output Voltage Characteristics Circuit Figure
LTC1326-2.5 Override Functions VCCA pin, unused, tied either VCC3 VCC25. This obvious solution since trip points VCC3 VCC25 will always greater than trip point VCCA. Likewise, VCC25, unused, tied VCC3. VCC3 must always used. Tying VCC3 VCC25 operating 2.5V supply will result continuous assertion RST. Extending Tolerance Input susceptible since brought front panel normal applications. tolerance this increased adding resistor series with pin. resistor increase tolerance approximately 10kV. PBR's internal pull-up current typical means there only 70mV (150mV max) dropped across resistor. Figure
LTC1326-2.5 3.3V ADJUSTABLE SUPPLY DC/DC FEEDBACK DIVIDER 2.5V
VCC3 VCC25 VCCA
SRST
10k*
PUSH-BUTTON RESET
SYSTEM RESET
*OPTIONAL RESISTOR EXTENDS TOLERANCE INPUT APPROXIMATELY 10kV
1326/2.5
Figure Triple Supply Monitor (3.3V, 2.5V Adjustable) with Extended Tolerance
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LTC1326/LTC1326-2.5
TYPICAL APPLICATIONS
Triple Supply Monitor (3.3V, Adjustable)
LTC1326 3.3V ADJUSTABLE SUPPLY DC/DC FEEDBACK DIVIDER
ADJUSTABLE SUPPLY
VCC3 VCC5 VCCA
SRST
SYSTEM RESET
1326/2.5 TA03
Dual Supply Monitor (3.3V Defeat VCCA Input)
LTC1326 3.3V VCC3 VCC5 VCCA SRST
1326/2.5 TA05
SYSTEM RESET
Dual Supply Monitor (3.3V Plus Adj)
3.3V LTC1326 VCC3 VCC5 VCCA SRST 4.7k
SYSTEM RESET
1326/2.5
REFER LTC1326 OVERRIDE FUNCTIONS APPLICATIONS INFORMATION SECTION.
Dual Supply Monitor (3.3V Plus Adj)
3.3V LTC1326-2.5 ADJUSTABLE SUPPLY VCC3 VCC25 VCCA SRST 4.7k
SYSTEM RESET
1326/2.5 TA07
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LTC1326/LTC1326-2.5
TYPICAL APPLICATIONS
SRST Tied OR-Tying Other Sources Generate Reset Reset
LTC1326/ LTC1326-2.5 PUSHBUTTON 3.3V 4.7k SRST RESET
ADJUSTABLE RESET TRIP THRESHOLD 2.74V
Using Short Pulse Width, Push-Button Soft Reset Feature Initiate Hard Reset
LTC1326-2.5 3.3V 2.5V
VCC3 RESET OTHER OPEN DRAIN RESET SOURCES OR-TIED RESET
1326/2.5 TA08
Using VCCA Tied DC/DC Feedback Divider
2.9V LTC1435 35.7k 3.3V 2.8k
22.1k LTC1326
VOSENSE
VCC3 VCC5 VCCA
SRST
1326/2.5 TA09
SYSTEM RESET
VCC3 VCC25 VCCA
SRST
RESET
40ns 10µs
20ms
200ms
1326/2.5 TA11
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LTC1326/LTC1326-2.5
TYPICAL APPLICATIONS
Monitoring Negative Supply
3.3V 0.1µF 150k 2N3906 150k 2N3906 VCCA 100k 0.1µF LTC1326 VCC3 VCC5 VCCA SRST SYSTEM RESET
2N3904 392k
3.3V
LTC1326-2.5
VCC3 VCC25 VCCA
SRST
ADJUSTABLE SUPPLY
2.5V
OUTPUT VOLTAGE
(100k)(0.98)(VTRIP 0.55)(-1)
SUPPLY 3.3V VTRIP 4.6V 10.8V 392k 237k
1326/2.5 TA12
Reset Valid VCC3 Down
100k
VCC3 VCC25 VCCA 25°C OUTPUT WITH 100k PULL-UP VCC3
SYSTEM RESET
1326/2.5 TA13
OUTPUT WITHOUT 100k PULL-UP. LOAD VCC3
1326/2.5 TA13a
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LTC1326/LTC1326-2.5
PACKAGE DESCRIPTIO
Package 8-Lead Plastic MSOP
(Reference 05-08-1660)
0.889 0.127 (.035 .005) 3.20 3.45 (.126 .136) 0.65 (.0256) 3.00 0.102 (.118 .004) (NOTE 0.52 (.0205) DETAIL
4.90 0.152 (.193 .006)
5.23 (.206)
0.42 0.038 (.0165 .0015)
RECOMMENDED SOLDER LAYOUT 3.00 0.102 (.118 .004) (NOTE
0.254 (.010) GAUGE PLANE
0.53 0.152 (.021 .006) DETAIL 0.18 (.007) SEATING PLANE
1.10 (.043)
0.86 (.034)
0.22 0.38 (.009 .015)
NOTE: DIMENSIONS MILLIMETER/(INCH) DRAWING SCALE DIMENSION DOES INCLUDE MOLD FLASH, PROTRUSIONS GATE BURRS. MOLD FLASH, PROTRUSIONS GATE BURRS SHALL EXCEED 0.152mm (.006") SIDE DIMENSION DOES INCLUDE INTERLEAD FLASH PROTRUSIONS. INTERLEAD FLASH PROTRUSIONS SHALL EXCEED 0.152mm (.006") SIDE LEAD COPLANARITY (BOTTOM LEADS AFTER FORMING) SHALL 0.102mm (.004")
0.65 (.0256)
0.127 0.076 (.005 .003)
MSOP (MS8) 0204
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LTC1326/LTC1326-2.5
PACKAGE DESCRIPTIO
.050
.245
.030 ±.005 RECOMMENDED SOLDER LAYOUT
.010 .020 (0.254 0.508) .008 .010 (0.203 0.254)
.016 .050 (0.406 1.270) NOTE: DIMENSIONS
INCHES (MILLIMETERS) DRAWING SCALE THESE DIMENSIONS INCLUDE MOLD FLASH PROTRUSIONS. MOLD FLASH PROTRUSIONS SHALL EXCEED .006" (0.15mm)
Information furnished Linear Technology Corporation believed accurate reliable. However, responsibility assumed use. Linear Technology Corporation makes representation that interconnection circuits described herein will infringe existing patent rights.
Package 8-Lead Plastic Small Outline (Narrow .150 Inch)
(Reference 05-08-1610)
.189 .197 (4.801 5.004) NOTE
.045 ±.005
.160 ±.005
.228 .244 (5.791 6.197)
.150 .157 (3.810 3.988) NOTE
.053 .069 (1.346 1.752)
.004 .010 (0.101 0.254)
.014 .019 (0.355 0.483)
.050 (1.270)
0303
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LTC1326/LTC1326-2.5
TYPICAL APPLICATIO
ADJUSTABLE SUPPLY DC/DC FEEDBACK DIVIDER
RELATED PARTS
PART NUMBER LTC690 LTC694-3.3 LTC699 LTC1232 LTC1443/LTC1444/ LTC1445 LTC1536 LTC1540 LTC1726-2.5 LTC1726-5 LTC1727-2.5 LTC1727-5 LTC1728-1.8 LTC1728-2.5 LTC1728-5 LTC1985-1.8 LTC2900 LTC2901 LTC2902 LTC2903 LTC2904/LTC3905 LTC2906/LTC2907 LTC2908 DESCRIPTION Supply Monitor, Watchdog Timer Battery Backup 3.3V Supply Monitor, Watchdog Timer Battery Backup Supply Monitor Watchdog Timer Supply Monitor, Watchdog Timer Push-Button Reset Micropower Quad Comparators with Reference Precision Triple Supply Monitor Applications Nanopower Comparator with Reference Micropower Triple Supply Monitor 2.5V, 3.3V Micropower Triple Supply Monitor 3.3V Micropower Triple Supply Monitor with Individual Outputs Micropower Triple Supply Monitor with Individual Outputs Micropower Triple Supply Monitor 5-Pin SOT-23 Package Micropower Triple Supply Monitor 5-Pin SOT-23 Package Micropower Triple Supply Monitor 5-Pin SOT-23 Package Micropower Triple Supply Monitor 1.8V Programmable Quad Supply Monitor Programmable Quad Supply Monitor Programmable Quad Supply Monitor Precision Quad Supply Monitor 3-State Programmable Precision Dual Supply Monitor COMMENTS 4.65V Threshold 2.9V Threshold 4.65V Threshold 4.37V/4.62V Threshold LTC1443 1.182V Reference, LTC1444/LTC1445 have 1.221V Reference Adjustable Hysteresis Meets tFAIL Timing Specifications 1.182V Reference, 300nA Supply Current, 8-Pin MSOP Adjustable RESET Watchdog Time Outs Adjustable RESET Watchdog Time Outs 2.338V, 3.086V, Thresholds (±1.5%) 2.5, 3.3V, 4.675V, 3.086V, Thresholds (±1.5%) 3.3V, 2.805V, 1.683V,1V Thresholds (±1.5%) 1.8V, 2.338V, 3.086V, Thresholds (±1.5%) 2.5, 3.3V, 4.675V, 3.086V, Thresholds (±1.5%) 3.3V, Push-Pull RESET Output, SOT-23 Adjustable Reset, 10-Lead MSOP 10-Lead Package Adjustable Reset Watchdog Timer, 16-Lead SSOP Package Adjustable Reset Tolerance, 16-Lead SSOP Package, Margining Functions 6-Lead SOT-23 Package, Ultralow Voltage Reset Adjustable Tolerance Reset Timer, 8-Lead SOT-23 Package
Precision Dual Supply Monitor 1-Selectable Adjustable Separate Pin, RST/RST Outputs/Adjustable Reset Timer Precision Supply Monitor Fixed Adjustable) 8-Lead SOT-23 Packages
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, 95035-7417
(408)432-1900 FAX: (408) 434-0507 www.linear-tech.com
Triple Supply Monitor with 3.3V System Resets
3.3V LTC1326 VCC3 VCC5 VCCA SRST 3.3V SYSTEM RESET SYSTEM RESET 2N7002
1326/2.5 TA14
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LINEAR TECHNOLOGY CORPORATION 1998
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