LTC2908
Precision
Six Input Supply Monitor
FEATURES
DESCRIPTION
The LTC®2908 is a six input supply monitor for systems
requiring a precise and compact monitoring solution for
multiple supply voltages. The inputs can be shorted to-
gether for monitoring systems with fewer than six supply
voltages, and the open drain RST output of two or more
LTC2908 can be wired-OR together for monitoring sys-
tems with more than six supply voltages. The common
reset output remains low until all six inputs have been in
compliance for 200ms.
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Ultralow Voltage Reset: V = 0.5V Guaranteed*
CC
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Monitors Six Inputs Simultaneously:
5V, 3.3V, 2.5V, 1.8V, ADJ1, ADJ2 (LTC2908-A1)
3.3V, 2.5V, 1.8V, 1.5V, ADJ1, ADJ2 (LTC2908-B1)
2.5V, ADJ1, ADJ2, ADJ3, ADJ4, ADJ5
(LTC2908-C1)
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Guaranteed Threshold Accuracy: 1.5% of
Monitored Voltage Over Temperature
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Internal V Auto Select
CC
Power Supply Glitch Immunity
The LTC2908 features a tight 1.5% threshold accuracy
over the entire operating temperature range and glitch
immunity to ensure reliable reset operation without false
triggering. Theopen-drainRSToutput state is guaranteed
to be in the correct state as long as V1 and/or V2 is 0.5V
or greater.
200ms Reset Time Delay
Active Low Open-Drain RST Output
Low Profile (1mm) 8-Lead SOT-23 (ThinSOT™) and
Plastic (3mm × 2mm) DFN Packages
APPLICATIONS
TheLTC2908alsofeaturesadjustableinputswithanominal
threshold level at 0.5V. This product provides a precise,
space-conscious, micropower and general purpose solu-
tion for any kind of system requiring supply monitors.
, LT, LTC and 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. *Patent pending.
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Network Servers
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Wireless Base Stations
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Optical Networking Systems
Multivoltage Systems
Desktop and Notebook Computers
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TYPICAL APPLICATION
Six Supply Monitor with 5% Tolerance
(12V, 3.3V, 2.5V, 1.8V, 1.5V, 1.2V)
12V
RST Output Voltage vs V1
with 10k Pull-Up Resistor to V1
3.3V
2.5V
1.8V
DC/DC
DC/DC
DC/DC
DC/DC
DC/DC
0.4
V3 = V4 = V
=
ADJ1
=
V
ADJ2
V
ADJ4
= V
ADJ3
= V
ADJ5
= GND
0.3
0.2
0.1
0
SYSTEM
V1 INPUT
1.5V
1.2V
V2 = GND
0.1μF 0.1μF
2.15M
V
LTC2908-B1
GND
124k
V
100k
100k
V2 = V1 (A1/B1)
V1
V2 V3 V4
ADJ1
ADJ2
0.4
0
0.2
0.6
0.8
V1 (V)
RST
2908 TA01a
2908 TA01b
2908fc
1