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LTC1536 Precision Triple Supply Monitor for PCI Applications
FEATURES
s s s s s s s s s s s
DESCRIPTION
The LTC(R)1536 is designed for PCI local bus applications with multiple supply voltages that require low power, small size, high speed and high accuracy supply monitoring. For 3.3V and 5V supplies that are > 500mV below spec or for the condition when the 5V supply falls below the 3.3V supply, the LTC1536 has a very fast response time capable of meeting the PCI tFAIL timing specification. Tight 0.75% threshold accuracy and glitch immunity ensure reliable reset operation without false triggering. The RST output is guaranteed to be in the correct state for VCC5 or VCC3 down to 1V. The 100A typical supply current makes the LTC1536 ideal for power-conscious systems. A manual pushbutton reset input provides the ability to generate a very narrow "soft" reset pulse (100s typ) or a 200ms reset pulse equivalent to a power-on reset. Both SRST and RST outputs are open-drain and can be OR-tied with other reset sources.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Simultaneously Monitors 5V, 3.3V and Adjustable Inputs Guaranteed Threshold Accuracy: 0.75% Low Supply Current: 100A Internal Reset Time Delay: 200ms Manual Pushbutton Reset Input Active Low and Active High Reset Outputs Active Low "Soft" Reset Output Power Supply Glitch Immunity Guaranteed Reset for Either VCC3 1V or VCC5 1V Meets PCI tFAIL Timing Specifications Rev 2.1 8-Pin SO and MSOP Packages
APPLICATIONS
s s s s s s
PCI-Based Systems Desktop Computers Notebook Computers Intelligent Instruments Portable Battery-Powered Equipment Network Servers
TYPICAL APPLICATION
Motherboard PCI RST Generation
3.3V 0.3V 0.1F 1 5V 5% 0.1F 2 3 4 PWR GOOD RPU SELECTED TO MEET RISE TIME SLEW RATE REQUIREMENTS (1k MIN)
1536 TA01
LTC1536 VCC3 VCC5 VCCA GND PBR SRST RST RST 8 7 6 5
PUSHBUTTON RESET
RPU
VOLTAGE (1V/DIV)
RST
PCI LOCAL BUS
U
5 4 3 2 1 0
U
U
Power Fail Waveform 5V Dropping Below 3.3V by 300mV
VCC5 = 5V TO 3V STEP VCC3 = VCCA = 3.3V 4.7k PULL-UP FROM RST TO VCC3 VCC5
RST
TIME (20ns/DIV)
1536 TA02
1
LTC1536 ABSOLUTE
(Notes 1, 2)
AXI U
RATI GS
Operating Temperature Range LTC1536C............................................... 0C to 70C LTC1536I ............................................ - 40C to 85C Storage Temperature Range ................ - 65C to 150C Lead Temperature (Soldering, 10 sec)................. 300C
Terminal Voltage VCC3, VCC5, VCCA .................................... - 0.3V to 7V RST, SRST ............................................ - 0.3V to 7V RST ......................................... - 0.3V to VCC3 + 0.3V PBR .......................................................... - 7V to 7V
PACKAGE/ORDER I FOR ATIO
TOP VIEW VCC3 VCC5 VCCA GND 1 2 3 4 8 7 6 5 PBR SRST RST RST
ORDER PART NUMBER LTC1536CMS8 MS8 PART MARKING LTBV
MS8 PACKAGE 8-LEAD PLASTIC MSOP
TJMAX = 125C, JA = 160C/ W
Consult factory for Military grade parts.
ELECTRICAL CHARACTERISTICS
VCC3 = 3.3V, VCC5 = 5V, VCCA = VCC3, TA = 25C unless otherwise noted.
SYMBOL VRT3 VRT5 VRTA VCC IVCC3 IVCC5 IVCCA tRST PARAMETER Reset Threshold VCC3 Reset Threshold VCC5 Reset Threshold VCCA VCC3 or VCC5 Operating Voltage VCC3 Supply Current VCC5 Input Current VCCA Input Current Reset Pulse Width CONDITIONS 0C TA 70C - 40C TA 85C 0C TA 70C - 40C TA 85C 0C TA 70C - 40C TA 85C RST in Correct Logic State PBR = VCC3 VCC5 = 5V VCCA = 1V, 0C TA 70C VCCA = 1V, - 40C TA 85C RST Low with 10k Pull-Up to VCC3 0C to 70C - 40C to 85C SRST Low with 10k Pull-Up to VCC3 VCC5, VCC3 or VCCA Less Than Reset Threshold VRT by 1%
q q q q q q q q q q q q q q
tSRST tUV
Soft Reset Pulse Width VCC Undervoltage Detect to RST
2
U
U
W
WW
U
W
TOP VIEW VCC3 1 VCC5 2 VCCA 3 GND 4 8 PBR 7 SRST 6 RST 5 RST
ORDER PART NUMBER LTC1536CS8 LTC1536IS8 S8 PART MARKING 1536 1536I
S8 PACKAGE 8-LEAD PLASTIC SO
TJMAX = 125C, JA = 150C/ W
MIN 2.962 2.925 4.687 4.625 0.992 0.980 1
TYP 2.985 2.985 4.725 4.725 1.000 1.000 100 10
MAX 3.008 3.008 4.762 4.762 1.007 1.007 7 200 20 5 15 280 300 200
UNITS V V V V V V V A A nA nA ms ms s s
-5 - 15 140 140 50
0 0 200 200 100 13
LTC1536
ELECTRICAL CHARACTERISTICS
VCC3 = 3.3V, VCC5 = 5V, VCCA = VCC3, TA = 25C unless otherwise noted.
SYMBOL IPBR VIL VIH tPW tDB tPB VOL PARAMETER PBR Pull-Up Current PBR, RST Input Low Voltage PBR, RST Input High Voltage PBR Min Pulse Width PBR Debounce PBR Assertion Time for Transition from Soft to Hard Reset Mode RST Output Voltage Low Deassertion of PBR Input to SRST Output (PBR Pulse Width = 1s) PBR Held Less Than VIL, 0C to 70C PBR Held Less Than VIL, - 40C to 85C ISINK = 5mA ISINK = 100A 0C TA 70C ISINK = 100A - 40C TA 85C SRST Output Voltage Low RST Output Voltage Low VOH RST Output Voltage High (Note 3) SRST Output Voltage High (Note 3) RST Output Voltage High tPHL tPLH tFAIL tPF Propagation Delay RST to RST High Input to Low Output Propagation Delay RST to RST Low Input to High Output VCC5 or VCC3 0.5V Undervoltage to RST (Note 4) VCC5 < (VCC3 - 300mV) RST (Note 4) ISINK = 2.5mA ISINK = 2.5mA ISOURCE = 1A ISOURCE = 1A ISOURCE = 600A CRST = 20pF CRST = 20pF VCC5 Drops Below 4.25V or VCC3 Drops Below 2.5V (Note 5) VCC5 Drops Below VCC3 By 300mV (Note 6)
q q
CONDITIONS PBR = 0V, 0C TA 70C PBR = 0V, - 40C TA 85C
q q q q q q q q q
MIN 3 3 2 40
TYP 7 7
MAX 10 15 0.8
UNITS A A V V ns
20 1.4 1.4 2.0 2.0 0.15 0.05 0.05 0.05 0.05 0.05 0.05 0.15 0.15 VCC3 - 1 VCC3 - 1 VCC3 - 1 25 45 150 50
35 2.8 3.0 0.4 0.4 0.4 0.4 0.4 0.4 0.4 0.4 0.4
ms s s V V V V V V V V V V V V ns ns
VCC3 = 1V, VCC5 = 0V VCC3 = 0V, VCC5 = 1V VCC3 = 1V, VCC5 = 1V VCC3 = 1.1V, VCC5 = 0V VCC3 = 0V, VCC5 = 1.1V VCC3 = 1.1V, VCC5 = 1.1V
q q q q q q q q q q q
450 90
ns ns
The q denotes specifications which apply over the full operating temperature range. Note 1: Absolute Maximum Ratings are those values beyond which the life of the device may be impaired. Note 2: All voltage values are with respect to GND. Note 3: The output pins SRST and RST have weak internal pull-ups to VCC3 of 6A. However, external pull-up resistors may be used when faster rise times are required.
Note 4: Conforms to PCI Local Bus Specification Rev 2.1, Sect. 4.3.2 for tFAIL. Note 5: VCC3 or VCC5 falling at - 0.1V/s, time measured from VRTX - 500mV to RST at 1.5V. Note 6: VCC5 falling from 5V to 3V in 10ns, time measured from VCC5 = (VCC3 - 300mV) to RST at 1.5V.
3
LTC1536 TYPICAL PERFORMANCE CHARACTERISTICS
IVCC3 vs Temperature
140 120 100
IVCC3 (A)
INPUT CURRENT (nA)
80 60 40 20 0 - 45
IVCC5 (A)
- 25
35 15 -5 55 TEMPERATURE (C)
VCC5 Threshold Voltage vs Temperature
4.750
VCC3 THRESHOLD VOLTAGE, VRT3 (V)
4.740 4.735 4.730 4.725 4.720 4.715 4.710 4.705 4.700 - 60 - 40 - 20 0 20 40 60 TEMPERATURE (C) 80 100
VCCA THRESHOLD VOLTAGE, VRTA (V)
VCC5 THRESHOLD VOLTAGE, VRT5 (V)
4.745
Reset Pulse Width vs Temperature
225
RESET PULSE WIDTH, tRST (ms)
220 215 210 205 200 195 190 - 50
110.0 107.5 105.0 102.5 100.0 97.5 95.0 - 50
PBR ASSERTION TIME TO RESET, tPB (SEC)
SOFT RESET PULSE WIDTH, tSRST (s)
- 25
50 25 0 TEMPERATURE (C)
4
UW
75
1536 G01 1536 G04
IVCC5 vs Temperature
20.0 17.5 15.0 12.5 10.0 7.5 5.0 2.5 0 - 45 - 25 35 15 -5 55 TEMPERATURE (C) 75
1536 G02
VCCA Input Current vs Input Voltage
3 2 1 0 -1 -2 -3 0.8 0.85 0.9 0.95 1.0 1.05 1.1 1.15 1.2 INPUT VOLTAGE (V)
1536 G03
TA = 25C
VCC3 Threshold Voltage vs Temperature
3.010 3.005 3.000 2.995 2.990 2.985 2.980 2.975 2.970 2.965 2.960 - 60 - 40 - 20 0 20 40 60 80 100
1.005 1.004 1.003 1.002 1.001 1.000 0.999 0.998 0.997 0.996
VCCA Threshold Voltage vs Temperature
TEMPERATURE (C)
1536 G05
0.995 - 60 - 40 - 20 0 20 40 60 TEMPERATURE (C)
80
100
1536 G06
"Soft" Reset Pulse Width vs Temperature
112.5 2.25 2.20 2.15 2.10 2.05 2.00 1.95
PBR Assertion Time to Reset vs Temperature
75
100
1536 G07
- 25
50 25 0 TEMPERATURE (C)
75
100
1536 G08
1.90 - 50
- 25
50 25 0 TEMPERATURE (C)
75
100
1536 G09
LTC1536 TYPICAL PERFORMANCE CHARACTERISTICS
VCC3 Typical Transient Duration vs Reset Comparator Overdrive
50
TYPICAL TRANSIENT DURATION (s) TYPICAL TRANSIENT DURATION (s)
TYPICAL TRANSIENT DURATION (s)
45 40 35 30 25 20 15 10 5
RESET OCCURS ABOVE CURVE
0 0.001 0.01 0.1 1 VCC3 RESET COMPARATOR OVERDRIVE, VRT3 - VCC3 (V)
1536 G10
RST Output Voltage vs Supply Voltage
5.0 4.5 RST OUTPUT VOLTAGE (V) 4.0 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 SUPPLY VOLTAGE, VCC (V)
1536 G13
RST OUTPUT VOLTAGE (V)
VCC5 = VCC3 = VCCA 4.7k PULL-UP FROM RST TO VCC5 TA = 25C
Undervoltage Response Time vs Temperature
VOLTAGE (500mV/DIV)
85 - 40 25 tFAIL SPEC MARGIN VCC3 FALLING FROM 3.3V TO 2.3V AT (- 0.1V/s) TIME (1s/DIV)
1536 G15
VOLTAGE (1V/DIV)
UW
VCC5 Typical Transient Duration vs Reset Comparator Overdrive
45 40 35 30 25 20 15 10 5 0 0.01 0.1 1 0.001 VCC5 RESET COMPARATOR OVERDRIVE, VRT5 - VCC5 (V)
1536 G11
VCCA Typical Transient Duration vs Reset Comparator Overdrive
40 35 30 25 20 15 10 5 0 0.001 0.01 0.1 1 VCCA RESET COMPARATOR OVERDRIVE, VRTA - VCCA (V)
1536 G12
RESET OCCURS ABOVE CURVE
RESET OCCURS ABOVE CURVE
RST Output Voltage vs Supply Voltage
5.0 4.5 4.0 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 SUPPLY VOLTAGE, VCC (V)
1536 G16
VCC5 = VCC3 = VCCA RST PIN LOADED WITH 10M TO GND TA = 25C
Power-Fail Response Time vs Temperature
DEVICE THRESHOLD PCI SPEC
VCC3
VCC5
85 - 40 25 RST
RST
TIME (20ns/DIV)
1536 G14
5
LTC1536
PIN FUNCTIONS
VCC3 (Pin 1): 3.3V Sense Input and Power Supply Pin for the IC. Bypass to ground with 0.1F ceramic capacitor. VCC5 (Pin 2): 5V Sense Input. Used as gate drive for RST output FET when the voltage on VCC5 is greater than the voltage on VCC3. VCCA (Pin 3): 1V Sense, High Impedance Input. Can be used as a logic input with a 1V threshold. If unused it can be tied to either VCC3 or VCC5. GND (Pin 4): Ground. RST (Pin 5): Reset Logic Output. Active high CMOS logic output, drives high to VCC3, buffered compliment of RST. An external pull-down on the RST pin will drive this pin high. RST (Pin 6): Reset Logic Output. Active low, open-drain logic output with weak pull-up to VCC3. Can be pulled up greater than V CC3 when interfacing to 5V logic. Asserted when one or more of the supplies are below trip thresholds and held for 200ms after all supplies become valid. Also asserted after PBR is held low for more than two seconds and for an additional 200ms after PBR is released. SRST (Pin 7): "Soft" Reset. Active low, open-drain logic output with weak pull-up to VCC3. Can be pulled up greater than VCC3 when interfacing to 5V logic. Asserted for 100s after PBR is held low for less than two seconds and released. PBR (Pin 8): Pushbutton Reset. Active low logic input with weak pull-up to VCC3. Can be pulled up greater than VCC3 when interfacing to 5V logic. When asserted for less than two seconds, outputs a soft reset 100s pulse on the SRST pin. When PBR is asserted for greater than two seconds, the RST output is forced low and remains low until 200ms after PBR is released.
BLOCK DIAGRAM
PBR 8 TO POWER DETECT AND VCC INTERNAL VCC3 1
VCC5 2
VCCA 3
GND 4
REF
6
-
TO POWER DETECT
-
+
+
-
-
+
-
-
+
+
+
W
U
U
U
VCC3 7A PBR TIMER SOFT RESET RESET 6A
VCC3
7
SRST
FAST
SLOW VCC3 200ms RESET GENERATOR POWER DETECT/ GATE DRIVE 6A
VCC3
6
RST
FAST
VCC3 VCC5 5 RST
FAST
SLOW
SLOW
1326 BD
LTC1536
TI I G DIAGRA S
VCC Monitor Timing
VCCX VRTX tRST RST
1536 TD01
tFAIL Fast Undervoltage Detect
SLEW RATE 0.1V/s VRTX VCC3 OR VCC5 500mV
VCC5 3.3V
tFAIL
RST
1536 TD03
APPLICATIONS INFORMATION
Operation The LTC1536 is a low power, high accuracy triple supply monitoring circuit. This reset generator has two basic functions: generation of a reset when power supplies are out of range, and generation of a reset or "soft" reset when the reset button is pushed. The LTC1536 has the added feature that when the reset supplies are grossly undervoltage there is a very short delay from undervoltage detect to assertion of RST. Supply Monitoring All three VCC inputs must be above predetermined thresholds for 200ms before the reset output is released. The LTC1536 will assert reset during power-up, power-down and brownout conditions on any one or more of the VCC inputs. On power-up, either the VCC5 or VCC3 pin can power the drive circuits for the RST pin. This ensures that RST will be low when either VCC5 or VCC3 reaches 1V. As long as any one of the VCC inputs is below its predetermined threshold, RST will stay a logic low. Once all of the VCC inputs rise above their thresholds, an internal timer is started and RST is released after 200ms. RST outputs the inverted state of what is seen on RST. RST is reasserted whenever any one of the VCC inputs drops below its predetermined threshold and remains asserted until 200ms after all of the VCC inputs are above their thresholds. On power-down, once any of the VCC inputs drops below its threshold, RST is held at a logic low. A logic low of 0.4V is guaranteed until VCC3 and VCC5 drops below 1V. Pushbutton Reset The LTC1536 provides a pushbutton reset input pin. The PBR input has an internal pull-up current source to VCC3. If the PBR pin is not used it can be left floating.
U
W
W
U
U
UW
Pushbutton Reset Function Timing
PBR t < tPB tDB RST tSRST SRST
1536 TD02
tPB
tRST
Power-Fail Detect
FALL TIME 10ns, VCC3 = 3.3V 300mV
tPF
RST
1536 TD04
7
LTC1536
APPLICATIONS INFORMATION
When the PBR is pulled low for less than tPB ( 2 sec), a narrow (100s typ) soft reset pulse is generated on the SRST output pin after the button is released. The pushbutton circuitry contains an internal debounce counter which delays the output of the soft reset pulse by typically 20ms. This pin can be OR-tied to the RST pin and issue what is called a "soft" reset. The SRST thereby resets the microprocessor without interrupting the DRAM refresh cycle. In this manner DRAM information remains undisturbed. Alternatively, SRST may be monitored by the processor to initiate a software-controlled reset. When the PBR pin is held low for longer than tPB ( 2 sec), a standard reset is generated. Once the 2-second period has elapsed, a reset signal is produced by the pushbutton logic, thereby clearing the reset counter. Once the PBR pin is released, the reset counter begins counting the reset period (200ms nominal). Consequently, the reset outputs remain asserted for approximately 200ms after the button is released. Fast Undervoltage for PCI Applications The LTC1536 is designed for PCI Local Bus applications that require reset to be asserted quickly in response to one or both of the power supply rails (5V and 3.3V) going out of spec. The spec for tFAIL and tPF are met with enough margin to give the designer the ability to add follow-on logic as needed by system requirements. The VCCA pin can be used to monitor the "power good" signal and keep reset applied until both supplies are in spec and the power good signal is high. Glitch Immunity and Fast Undervoltage Detection The LTC1536 achieves its high speed characteristics while maintaining glitch immunity by using two sets of comparators. The VCC5 and VCC3 sense inputs each have two comparators set at different thresholds. A slow, very accurate comparator monitors the supply for precision undervoltage detection. In parallel, but with a threshold 250mV lower than the precision threshold, is a very fast comparator that detects when the supply is quickly going out of specification. Because the fast comparator threshold is set 250mV above the PCI specification, typical values for tFAIL can be negative. 3V or 5V Power Detect/Gate Drive The LTC1536 for the most part is powered internally from the VCC3 pin. The exception is at the gate drive of the output FET on the RST pin. On the gate to this FET is power detect circuitry used to detect and drive the gate from either the 3.3V pin or the 5V pin, whichever pin has the highest potential. This ensures the part pulls the RST pin low as soon as either input pin is 1V. Extended ESD Tolerance of the PBR Input Pin The PBR pin is susceptible to ESD since it can be brought out to a front panel in normal applications. The ESD tolerance of this pin can be increased by adding a resistor in series with the PBR pin. A 10k resistor can increase the ESD tolerance of the PBR pin to approximately 10kV. The PBR's internal pull-up current of 7A typical means there is only 70mV (150mV max) dropped across the resistor.
TYPICAL APPLICATIONS N
PCI Expansion Board RST Generation
3.3V SUPPLY
LTC1536
0.1F PCI LOCAL BUS 1 5V SUPPLY 0.1F 2 3 4 RESET
LTC1536 VCC3 VCC5 VCCA GND PBR SRST RST RST 8 7 6 5 ONBOARD DEVICE
1536 TA08
8
U
W
U
U
U
Dual Supply Monitor (3.3V and 5V, VCCA Input Monitoring "Power Good")
3.3V 5V PWR GOOD
1 2 3 4
VCC3 VCC5 VCCA GND
PBR SRST RST RST
8 7 6 5
1536 TA04
SYSTEM RESET
LTC1536
TYPICAL APPLICATIONS N
RESET Valid for VCC3 Down to 0V in a Dual Supply Application
LTC1536 3.3V 5V 1 2 3 4 VCC3 VCC5 VCCA GND PBR SRST RST RST 8 7 6 5 SYSTEM RESET
1536 TA09
Triple Supply Monitor (3.3V, 5V and Adjustable)
LTC1536 3.3V ADJUSTABLE SUPPLY OR DC/DC FEEDBACK DIVIDER R1 5V 1 2 3 R2 4 VCC3 VCC5 VCCA GND PBR SRST RST RST 8 7 6 5 SYSTEM RESET 10k* PUSHBUTTON RESET
*OPTIONAL RESISTOR EXTENDS ESD TOLERANCE OF PBR INPUT 8kV TO 10kV
SRST Tied to RST and OR-Tying Other Sources to RST to Generate Reset and Reset
PUSHBUTTON 8 3.3V 4.7k SRST 7 RESET
LTC1536
PBR
6A
6A RST 6 VCC3 RST 5 RESET OTHER OPEN DRAIN RESET SOURCES OR-TIED TO RESET
U
100k
1536 TA03
Using VCCA Tied to DC/DC Feedback Divider
2.9V LTC1435 VOSENSE 6 35.7k 1% 3.3V 2.8k 1% ADJUSTABLE RESET TRIP THRESHOLD 2.74V 22.1k 1% 5V LTC1536 1 2 3 4 VCC3 VCC5 VCCA GND PBR SRST RST RST 8 7 6 5 SYSTEM RESET
1536 TA07
1536 TA05
9
LTC1536
PACKAGE DESCRIPTION
0.007 (0.18) 0.021 0.006 (0.53 0.015)
* DIMENSION DOES NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS. MOLD FLASH, PROTRUSIONS OR GATE BURRS SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE ** DIMENSION DOES NOT INCLUDE INTERLEAD FLASH OR PROTRUSIONS. INTERLEAD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE
10
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Dimensions in inches (millimeters) unless otherwise noted.
MS8 Package 8-Lead Plastic MSOP
(LTC DWG # 05-08-1660)
0.118 0.004* (3.00 0.102) 8 76 5
0.192 0.004 (4.88 0.10)
0.118 0.004** (3.00 0.102)
1 0.040 0.006 (1.02 0.15) 0 - 6 TYP SEATING PLANE 0.012 (0.30) 0.0256 REF (0.65) TYP
23
4 0.034 0.004 (0.86 0.102)
0.006 0.004 (0.15 0.102)
MSOP (MS8) 1197
LTC1536
PACKAGE DESCRIPTION
0.010 - 0.020 x 45 (0.254 - 0.508) 0.008 - 0.010 (0.203 - 0.254) 0- 8 TYP
0.016 - 0.050 0.406 - 1.270
*DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE **DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE
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.
U
Dimensions in inches (millimeters) unless otherwise noted.
S8 Package 8-Lead Plastic Small Outline (Narrow 0.150)
(LTC DWG # 05-08-1610)
0.189 - 0.197* (4.801 - 5.004) 8 7 6 5
0.228 - 0.244 (5.791 - 6.197)
0.150 - 0.157** (3.810 - 3.988)
1 0.053 - 0.069 (1.346 - 1.752)
2
3
4
0.004 - 0.010 (0.101 - 0.254)
0.014 - 0.019 (0.355 - 0.483)
0.050 (1.270) TYP
SO8 0996
11
LTC1536
TYPICAL APPLICATIONS N
Quad Supply Monitor: 12V: Undervoltage, Overvoltage 5V: Undervoltage, Overvoltage 3.3V: Undervoltage, Overvoltage - 12V: Undervoltage
3.3V 0.3V 3 2.37M 1% 1.21M 1% LTC1444 LTC1536 0.1F 100k 1 A 2 5V 12V 1.05M 1% B 1 102k 1% OPTIONAL PWR GOOD 2 3 4 8 7 6 5 SYSTEM RESET
5V 5%
1.21M
12V 5%
9.31M 1% 1M
10
-
C
11
10.7M 1% - 12V 10%
1.21M 1%
8 14 HYST
RELATED PARTS
PART NUMBER LTC690 LTC694-3.3 LTC699 LTC1232 LTC1326 LTC1326-2.5 DESCRIPTION 5V Supply Monitor, Watchdog Timer and Battery Backup 3.3V Supply Monitor, Watchdog Timer and Battery Backup 5V Supply Monitor and Watchdog Timer 5V Supply Monitor, Watchdog Timer and Pushbutton Reset Micropower Precision Triple Supply Monitor Micropower Precision Triple Supply Monitor COMMENTS 4.65V Threshold 2.9V Threshold 4.65V Threshold 4.37V/4.62V Threshold 4.725V, 3.118V, 1V Thresholds (0.75%) 2.363V, 3.118V, 1V Thresholds (0.75%)
12
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417 q (408) 432-1900 FAX: (408) 434-0507 q TELEX: 499-3977 q www.linear-tech.com
+
13
-
12
+
7
-
4.02M 1%
6
+
5
-
4
U
VCC3 VCC5 VCCA GND
PBR SRST RST RST
16
+
D
15
REF 1.221V 9
1536 TA07
1536F LT/TP 0498 4K * PRINTED IN THE USA
(c) LINEAR TECHNOLOGY CORPORATION 1997

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