
1
LTC2908
Precision
sn2908 2908fs
Six Supply Monitor
■
Ultralow Voltage Reset: V
CC
= 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 V
CC
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
APPLICATIU
Six Supply Monitor with 5% Tolerance
(12V, 3.3V, 2.5V, 1.8V, 1.5V, 1.2V)
■
Network Servers
■
Wireless Base Stations
■
Optical Networking Systems
■
Mulitvoltage Systems
■
Desktop and Notebook Computers
■
Handheld Devices
FEATURES
DESCRIPTIOU
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
U
RST
2.15M
0.1
μ
F
V1
V2 V3 V4
LTC2908-B1
GND
V
ADJ1
12V
3.3V
2.5V
1.8V
1.5V
1.2V
2908 TA01a
0.1
μ
F
100k
DC/DC
DC/DC
DC/DC
DC/DC
DC/DC
SYSTEM
124k
V
ADJ2
100k
V1 (V)
0
R
0.2
V2 = GND
V2 = V1
0.3
0.8
2908 TA01b
0.1
0
0.2
0.4
0.6
0.4
V3 = V4 = V
ADJ1
=
V
ADJ2
= GND
RST Output Voltage vs V1
with 10k Pull-Up Resistor to V1