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LTC2908IDDB-A1#TRMPBF PDF预览

LTC2908IDDB-A1#TRMPBF

更新时间： 2024-11-05 13:09:47
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凌特 - Linear 监视器
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16页 195K
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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.  
n
Ultralow Voltage Reset: V = 0.5V Guaranteed*  
CC  
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
n
n
n
n
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.  
n
Network Servers  
n
Wireless Base Stations  
n
Optical Networking Systems  
Multivoltage Systems  
Desktop and Notebook Computers  
n
n
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
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