LTC2908 Datasheet, PDF (1/16 Pages) Linear Integrated Systems – Precision Six Supply Monitor

FEATURES
■ _{Ultralow Voltage Reset: VCC = 0.5V Guaranteed*}
■ _{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)
■ _{Guaranteed Threshold Accuracy: ±1.5% of}
Monitored Voltage Over Temperature
■ _{Internal VCC Auto Select}
■ _{Power Supply Glitch Immunity}
■ _{200ms Reset Time Delay}
■ _{Active Low Open-Drain RST Output}
■ _{Low Profile (1mm) SOT-23 (ThinSOT}^TM_{) and Plastic}
(2mm × 3mm) DFN Packages
U
APPLICATIO S
■ _{Network Servers}
■ _{Wireless Base Stations}
■ _{Optical Networking Systems}
■ _{Mulitvoltage Systems}
■ _{Desktop and Notebook Computers}
■ _{Handheld Devices}
LTC2908
Precision
Six Supply Monitor
DESCRIPTIO
The LTC^®2908 is a six supply monitor for systems with a
large number of supply voltages that require a precise and
compact solution. 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 (– 40°C to
85°C) and glitch immunity to ensure reliable reset opera-
tion 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 two adjustable inputs with a
nominal threshold level at 0.5V. This product provides a
precise, space-conscious, micropower and general pur-
pose solution for any kind of system requiring supply
monitors.
, LTC and LT are registered trademarks of Linear Technology Corporation.
ThinSOT is a trademark of Linear Technology Corporation.
*Patent pending.
TYPICAL APPLICATIO
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
1.5V
DC/DC
1.2V
DC/DC
0.1µF 0.1µF
SYSTEM
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 = GND
0.3
0.2
0.1
0
0
V2 = GND
V2 = V1
0.2
0.4
0.6
0.8
V1 (V)
2908 TA01b
sn2908 2908fs
1