LTC2908 Datasheet, PDF (1/16 Pages) Linear Integrated Systems – Precision Six 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 Over Temperature
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}
LTC2908
Precision
Six Input Supply Monitor
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.
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.
, 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.
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
2908fc
1