LTC2908_15 Datasheet, PDF (1/18 Pages) Linear Technology – Precision Six Input Supply Monitor

LTC2908
Precision
Six Input Supply Monitor
FEATURES
n _{Ultralow Voltage Reset: VCC = 0.5V Guaranteed*}
n _{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)
n _{Guaranteed Threshold Accuracy: ±1.5% of}
Monitored Voltage Overtemperature
n _{Internal VCC Auto Select}
n _{Power Supply Glitch Immunity}
n _{200ms Reset Time Delay}
n _{Active Low Open-Drain RST Output}
n _{Low Profile (1mm) 8-Lead SOT-23 (ThinSOT™) and}
Plastic (3mm × 2mm) DFN Packages
APPLICATIONS
n _{Network Servers}
n _{Wireless Base Stations}
n _{Optical Networking Systems}
n _{Multivoltage Systems}
n _{Desktop and Notebook Computers}
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
together for monitoring systems with fewer than six
supply voltages, and the open drain RST output of two or
more LTC2908s can be wired-OR together for monitoring
systems with more than six supply voltages. The common
reset output remains low until all six inputs have been in
compliance for 200ms.
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.
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.
The LTC2908 also features adjustable inputs with a nominal
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.
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
trademarks are the property of their respective owners. *Patent pending.
TYPICAL APPLICATION
Six Supply Monitor with 5% Tolerance
(12V, 3.3V, 2.5V, 1.8V, 1.5V, 1.2V)
12V
3.3V
DC/DC
2.5V
DC/DC
1.8V
DC/DC
SYSTEM
1.5V
DC/DC
1.2V
DC/DC
0.1μF 0.1μF
2.15M _100k 124k _100k
V1
V2 V3 V4 V_ADJ1
V_ADJ2
LTC2908-B1
GND
RST
2908 TA01a
RST Output Voltage vs V1
with 10k Pull-Up Resistor to V1
0.4
V3 = V4 = V_ADJ1 =
V_ADJ2 = V_ADJ3 =
V_ADJ4 = V_ADJ5 = GND
0.3
V1 INPUT
0.2
V2 = GND
0.1
V2 = V1 (A1/B1)
0
0
0.2
0.4
0.6
0.8
V1 (V)
2908 TA01b
2908fd
1