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LTC2907CTS8 Datasheet

  • LTC2907CTS8

  • Precision Dual Supply Monitors with One Pin-Selectable Thres...

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LTC2906/LTC2907
Precision Dual Supply Monitors
with One Pin-Selectable Threshold
and One Adjustable Input
FEATURES
s
s
DESCRIPTIO
s
s
s
s
s
s
s
s
s
s
Monitors Two Inputs Simultaneously
Three Threshold Selections for 5V, 3.3V or 2.5V
Supplies
Low Voltage Adjustable Input (0.5V)
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 (LTC2906 Only)
Adjustable Reset Time Delay (LTC2907 Only)
Open Drain RST Output
Guaranteed RST for V1
鈮?/div>
1V or V
CC
鈮?/div>
1V
Low Profile (1mm) SOT-23 (ThinSOT
TM
) and
Plastic (3mm
脳
2mm) DFN Packages
Desktop and Notebook Computers
Handheld Devices
Network Servers
Core, I/O Monitor
, LTC and LT are registered trademarks of Linear Technology Corporation.
The LTC
廬
2906/LTC2907 are dual supply monitors in-
tended for systems with multiple supply voltages. The
dual supply monitors have a common reset output with
delay (200ms for the LTC2906 and adjustable using an
external capacitor for the LTC2907). These products pro-
vide a precise, space-conscious and micropower solution
for supply monitoring.
The LTC2906/LTC2907 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 state
is guaranteed to be in the correct state for V1 and/or V
CC
down to 1V.
The LTC2906/LTC2907 also feature one adjustable input
with a nominal threshold level at 0.5V, another input with
three possible input threshold levels, and three supply
tolerances for possible margining. These features provide
versatility for any kind of system requiring dual supply
monitors. Two three-state input pins program the thresh-
old and tolerance level without requiring any external
components.
APPLICATIO S
s
s
s
s
TYPICAL APPLICATIO
Dual Supply Monitor with Adjustable Tolerance (2.5V, 0.8V)
DC/DC
CONVERTER
2.5V
0.8V
49.9k
V1
LTC2907
0.1碌F
V
CC
S1
TOL
TMR
22nF
GND
RST
V
ADJ
0.1碌F
100k
SYSTEM
LOGIC
Supply Selection Programming
V1
5.0
3.3
2.5
S1
V1
OPEN
GND
Tolerance Programming
TOLERANCE
5%
7.5%
29067 TA01
TOLERANCE = 10%
10%
U
TOL
V1
OPEN
GND
29067f
U
U
1

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