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LTC2905ITS8 Datasheet

  • LTC2905ITS8

  • Precision Dual Supply Monitors with Pin-Selectable Threshold...

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LTC2904/LTC2905
Precision Dual Supply Monitors
with Pin-Selectable Thresholds
FEATURES
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DESCRIPTIO
Monitors Two Inputs Simultaneously
Nine Threshold Combinations
Three Supply Tolerances (5%, 7.5%, 10%)
Guaranteed Threshold Accuracy:
鹵1.5%
of
Monitored Voltage Over Temperature
Internal V
CC
Auto Select
Power Supply Glitch Immunity
200ms Reset Time Delay (LTC2904 Only)
Adjustable Reset Time Delay (LTC2905 Only)
Open Drain RST Output
Guaranteed RST for V1
鈮?/div>
1V or V2
鈮?/div>
1V
Low Profile (1mm) SOT-23 (ThinSOT
TM
) and Plastic
(3mm x 2mm) DFN Packages
The LTC
廬
2904/LTC2905 are dual supply monitors in-
tended for systems with two supply voltages. The dual
supply monitors have a common reset output with delay
(200ms for the LTC2904 and adjustable using an external
capacitor for the LTC2905). This product provides a
precise, space-conscious and micropower solution for
supply monitoring.
The LTC2904/LTC2905 feature a tight 1.5% threshold
accuracy over the whole operating temperature range,
and glitch immunity to ensure reliable reset operation
without false triggering. The open drain RST output is
guaranteed to be in the correct state for inputs down to 1V.
The LTC2904/LTC2905 also feature three programming
input pins, which program the threshold and tolerance
level without requiring any external components. These
three programming pins provide a total of 27 different
voltage level and tolerance combinations, eliminating
the need to have different parts for development and
implementation of different systems with different voltage
levels requiring monitoring function.
APPLICATIO S
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Desktop and Notebook Computers
Handheld Devices
Network Servers
Core, I/O Monitor
, LTC and LT are registered trademarks of Linear Technology Corporation.
ThinSOT is a trademark of Linear Technology Corporation.
TYPICAL APPLICATIO
5V, 3.3V Dual Supply Monitor with 5% Tolerance
DC/DC
CONVERTER
5V
3.3V
SYSTEM
LOGIC
Table 1. Voltage Threshold Programming
V1
5.0
3.3
3.3
3.3
3.3
2.5
2.5
2.5
2.5
V2
3.3
2.5
1.8
1.5
1.2
1.8
1.5
1.2
1.0
S1
V1
Open
V1
Open
Open
GND
GND
GND
V1
S2
V1
GND
Open
V1
Open
GND
Open
V1
GND
V1
0.1碌F
S1
S2
TOL
LTC2905
V2
0.1碌F
TMR
22nF
GND
RST
29045 TA01
U
sn29045 29045fs
U
U
1

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