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LTC2909ITS8-2.5#PBF

Description
Processor Supervisor 0.5V 3 Active Low/Open Drain Automotive 8-Pin TSOT-23 T/R
File Size186KB,16 Pages
ManufacturerADI
Websitehttps://www.analog.com
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LTC2909ITS8-2.5#PBF Overview

Processor Supervisor 0.5V 3 Active Low/Open Drain Automotive 8-Pin TSOT-23 T/R

LTC2909ITS8-2.5#PBF Parametric

Parameter NameAttribute value
EU restricts the use of certain hazardous substancesCompliant
ECCN (US)0
Part StatusUnconfirmed
HTS8542.39.00.01
Number of Supervisors3
Maximum Reset Active Time (ms)260
Output DriverActive Low/Open Drain
Minimum Reset Threshold Voltage (V)0.4925
Typical Reset Threshold Voltage (V)0.5
Maximum Reset Threshold Voltage (V)0.5075
Monitored Voltage (V)3.3
Minimum Operating Supply Voltage (V)0.5
Maximum Operating Supply Voltage (V)6
Maximum Supply Current (uA)150
Power Fail DetectionNo
Watchdog TimerNo
Manual ResetNo
Chip Enable SignalsNo
Battery Backup SwitchingNo
Minimum Operating Temperature (°C)-40
Maximum Operating Temperature (°C)85
Supplier Temperature GradeIndustrial
PackagingTape and Reel
TypeVoltage Monitor
Pin Count8
Standard Package NameSOT-23
Supplier PackageTSOT-23
MountingSurface Mount
Package Height0.9(Max)
Package Length2.9
Package Width1.75(Max)
PCB changed8
Lead ShapeGull-wing
LTC2909
Precision Triple/Dual Input
UV, OV and Negative
Voltage Monitor
FEATURES
DESCRIPTIO
Two Low Voltage Adjustable Inputs (0.5V)
Pin Selectable Input Polarity Allows Negative
and OV Monitoring
Guaranteed Threshold Accuracy: ±1.5%
6.5V Shunt Regulator for High Voltage Operation
Low 50μA Quiescent Current
Buffered 1V Reference for Negative Supply Offset
Input Glitch Rejection
Adjustable Reset Timeout Period
Selectable Internal Timeout Saves Components
Open-Drain
R
S
T Output
Accurate UVLO for 2.5V, 3.3V, 5V Systems
Ultralow Voltage Reset: V
CC
= 0.5V Guaranteed
Space Saving 8-Lead TSOT-23 and 3mm
×
2mm DFN
Packages
The LTC
®
2909 is a dual input monitor intended for a variety
of system monitoring applications. Polarity selection and
a buffered reference output allow the LTC2909 to monitor
positive and negative supplies for undervoltage (UV) and
overvoltage (OV) conditions.
The two inputs have a nominal 0.5V threshold, featuring
tight 1.5% threshold accuracy over the entire operating
temperature range. Glitch filtering ensures reliable reset
operation without false triggering. A third fixed-threshold
UVLO monitor on the part’s V
CC
(also 1.5% accuracy) is
available for standard logic supplies.
The common reset output has a timeout that may use
a preset 200ms, be set by an external capacitor or be
disabled. A three-state input pin sets the input polarity
of each adjustable input without requiring any external
components.
The LTC2909 provides a highly versatile, precise, space-
conscious, micropower solution for supply monitoring.
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
APPLICATIO S
Desktop and Notebook Computers
Handheld Devices
Network Servers
Core, I/O Monitor
Automotive
TYPICAL APPLICATIO
3.3V UV/OV (Window) Monitor Application with
200ms Internal Timeout (3.3V Logic Out)
C
BYP
100nF
3.3V
R
P6
453k
ADJ1
R
P5
10.7k
V
CC
RST
LTC2909-2.5
REF
ADJ2
R
P4
76.8k
GND
2909 TA01a
SEL Pin Connection for Input Polarity
Combinations
POLARITY
R
PU
10k
FAULT
OUTPUT
ADJ1
+
+
SEL
TMR
U
ADJ2
SEL PIN
V
CC
OPEN
GND
U
U
+
2909fb
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