LTC2908
Precision
Six Input Supply Monitor
FEATURES DESCRIPTION
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Ultralow Voltage Reset: V = 0.5V Guaranteed* The LTC 2908 is a six input supply monitor for systems
CC
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Monitors Six Inputs Simultaneously: requiring a precise and compact monitoring solution
5V, 3.3V, 2.5V, 1.8V, ADJ1, ADJ2 (LTC2908-A1) for multiple supply voltages. The inputs can be shorted
3.3V, 2.5V, 1.8V, 1.5V, ADJ1, ADJ2 (LTC2908-B1) together for monitoring systems with fewer than six
2.5V, ADJ1, ADJ2, ADJ3, ADJ4, ADJ5 (LTC2908-C1) supply voltages, and the open drain RST output of two or
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Guaranteed Threshold Accuracy: 1.5% of more LTC2908s can be wired-OR together for monitoring
Monitored Voltage Overtemperature systems with more than six supply voltages. The common
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Internal V Auto Select reset output remains low until all six inputs have been in
CC
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Power Supply Glitch Immunity compliance for 200ms.
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200ms Reset Time Delay
The LTC2908 features a tight 1.5% threshold accuracy over
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Active Low Open-Drain RST Output
the entire operating temperature range and glitch immunity
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Low Pro le (1mm) 8-Lead SOT-23 (ThinSOT) and
to ensure reliable reset operation without false triggering.
Plastic (3mm 2mm) DFN Packages
The open-drain RST output state is guaranteed to be in the
correct state as long as V1 and/or V2 is 0.5V or greater.
APPLICATIONS
The LTC2908 also features adjustable inputs with a nominal
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Network Servers
threshold level at 0.5V. This product provides a precise,
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Wireless Base Stations
space-conscious, micropower and general purpose solu-
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Optical Networking Systems
tion for any kind of system requiring supply monitors.
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Multivoltage Systems
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. ThinSOT is a trademark of Linear Technology Corporation. All other
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Desktop and Notebook Computers
trademarks are the property of their respective owners. *Patent pending.
TYPICAL APPLICATION
Six Supply Monitor with 5% Tolerance
RST Output Voltage vs V1
(12V, 3.3V, 2.5V, 1.8V, 1.5V, 1.2V)
with 10k Pull-Up Resistor to V1
12V
0.4
V3 = V4 = V =
ADJ1
V = V =
ADJ2 ADJ3
3.3V
DC/DC V = V = GND
ADJ4 ADJ5
0.3
2.5V
DC/DC
V1 INPUT
SYSTEM
1.8V
DC/DC 0.2
1.5V
V2 = GND
DC/DC
0.1
1.2V
DC/DC
0.1F 0.1F
2.15M 124k
V2 = V1 (A1/B1)
100k 100k
0
0.4
0 0.2 0.6 0.8
V1 (V)
V1 V2 V3 V4 V V
ADJ1 ADJ2
2908 TA01b
LTC2908-B1
RST
GND
2908 TA01a
2908fd
1
RST OUTPUT VOLTAGE (V)LTC2908
ABSOLUTE MAXIMUM RATINGS (Notes 1, 2)
Storage Temperature Range
Terminal Voltages
DFN Package ......................................65C to 125C
V1, V2, V3, V4 .........................................0.3V to 7V
TSOT-23 Package ...............................65C to 150C
V , V , V , ..................0.3V to (V + 0.6V)
ADJ1 ADJ2 ADJ3 CC
Lead Temperature (Soldering, 10 sec) .................. 300C
V , V .............................0.3V to (V + 0.6V)
ADJ4 ADJ5 CC
RST .......................................................... 0.3V to 7V
Operating Temperature Range
LTC2908C ................................................ 0C to 70C
LTC2908I..............................................40C to 85C
PIN CONFIGURATION
LTC2908CDDB-A1 LTC2908CDDB-C1 LTC2908CTS8-A1 LTC2908CTS8-C1
LTC2908IDDB-A1 LTC2908IDDB-C1 LTC2908ITS8-A1 LTC2908ITS8-C1
LTC2908CDDB-B1 LTC2908CTS8-B1
LTC2908IDDB-B1 LTC2908ITS8-B1
TOP VIEW TOP VIEW
GND 1 8 V GND 1 8 V
ADJ2 ADJ4
TOP VIEW TOP VIEW
RST 2 7 V3 RST 2 7 V
ADJ3
V2 1 8V1 V1 1 8V
ADJ1
9 9
V4 3 6 V V 3 6 V 7 V 7 V
ADJ1 ADJ5 ADJ2
V4 2 ADJ1 V 2 ADJ2
ADJ5
V2 4 5 V1 V1 4 5 V
RST 3 6V3 RST 3 6V
ADJ1 ADJ3
GND 4 5 V GND 4 5 V
ADJ2 ADJ4
DDB8 PACKAGE DDB8 PACKAGE TS8 PACKAGE TS8 PACKAGE
8-LEAD (3mm 2mm) PLASTIC DFN 8-LEAD (3mm 2mm) PLASTIC DFN 8-LEAD PLASTIC TSOT-23 8-LEAD PLASTIC TSOT-23
T = 125C, = 76C/W T = 125C, = 76C/W T = 125C, = 250C/W T = 125C, = 250C/W
JMAX JA JMAX JA JMAX JA JMAX JA
EXPOSED PAD (PIN 9) EXPOSED PAD (PIN 9)
(PCB CONNECTION OPTIONAL) (PCB CONNECTION OPTIONAL)
ORDER INFORMATION
Lead Free Finish
TAPE AND REEL (MINI) TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC2908CDDB-A1#TRMPBF LTC2908CDDB-A1#TRPBF LBFD 8-LEAD (3mm 2mm) PLASTIC DFN 0C to 70C
LTC2908IDDB-A1#TRMPBF LTC2908IDDB-A1#TRPBF LBFF 8-LEAD (3mm 2mm) PLASTIC DFN 40C to 85C
LTC2908CDDB-B1#TRMPBF LTC2908CDDB-B1#TRPBF LBFG 8-LEAD (3mm 2mm) PLASTIC DFN 0C to 70C
LTC2908IDDB-B1#TRMPBF LTC2908IDDB-B1#TRPBF LBFH 8-LEAD (3mm 2mm) PLASTIC DFN 40C to 85C
LTC2908CDDB-C1#TRMPBF LTC2908CDDB-C1#TRPBF LCFV 8-LEAD (3mm 2mm) PLASTIC DFN 0C to 70C
LTC2908IDDB-C1#TRMPBF LTC2908IDDB-C1#TRPBF LCFV 40C to 85C
8-LEAD (3mm 2mm) PLASTIC DFN
LTC2908CTS8-A1#TRMPBF LTC2908CTS8-A1#TRPBF LTBFJ 8-LEAD PLASTIC TSOT-23 0C to 70C
LTC2908ITS8-A1#TRMPBF LTC2908ITS8-A1#TRPBF LTBFK 8-LEAD PLASTIC TSOT-23 40C to 85C
LTC2908CTS8-B1#TRMPBF LTC2908CTS8-B1#TRPBF LTBFM 8-LEAD PLASTIC TSOT-23 0C to 70C
LTC2908ITS8-B1#TRMPBF LTC2908ITS8-B1#TRPBF LTBFN 8-LEAD PLASTIC TSOT-23 40C to 85C
LTC2908CTS8-C1#TRMPBF LTC2908CTS8-C1#TRPBF LTCFT 8-LEAD PLASTIC TSOT-23 0C to 70C
LTC2908ITS8-C1#TRMPBF LTC2908ITS8-C1#TRPBF LTCFT 8-LEAD PLASTIC TSOT-23 40C to 85C
TRM = 500 pieces. *Temperature grades are identi ed by a label on the shipping container.
Consult LTC Marketing for parts speci ed with wider operating temperature ranges.
Consult LTC Marketing for information on lead based nish parts.
For more information on lead free part marking, go to: