ltc2908its8-c1-trpbf Linear Technology Corporation, ltc2908its8-c1-trpbf Datasheet

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ltc2908its8-c1-trpbf

Manufacturer Part Number
ltc2908its8-c1-trpbf
Description
Precision Six Input Supply Monitor
Manufacturer
Linear Technology Corporation
Datasheet
FEATURES
APPLICATIO S
TYPICAL APPLICATIO
Ultralow Voltage Reset: V
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)
Guaranteed Threshold Accuracy:
Monitored Voltage Over Temperature
Internal V
Power Supply Glitch Immunity
200ms Reset Time Delay
Active Low Open-Drain RST Output
Low Profile (1mm) 8-Lead SOT-23 (ThinSOT
Plastic (3mm × 2mm) DFN Packages
Network Servers
Wireless Base Stations
Optical Networking Systems
Multivoltage Systems
Desktop and Notebook Computers
DC/DC
DC/DC
DC/DC
DC/DC
DC/DC
CC
Auto Select
12V
3.3V
2.5V
1.8V
1.5V
1.2V
Six Supply Monitor with 5% Tolerance
(12V, 3.3V, 2.5V, 1.8V, 1.5V, 1.2V)
V1
U
0.1µF
0.1µF
V2 V3 V4
CC
LTC2908-B1
= 0.5V Guaranteed*
U
GND
2.15M
±
1.5% of
V
ADJ1
100k
124k
TM
V
ADJ2
) and
RST
100k
2908 TA01a
SYSTEM
DESCRIPTIO
The LTC
requiring a precise and compact monitoring solution for
multiple supply voltages. The inputs can be shorted together
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 systems with
more than six supply voltages. 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 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 as long as V1 and/or V2 is 0.5V
or greater.
The LTC2908 also features adjustable inputs with a nomi-
nal threshold level at 0.5V. This product provides a pre-
cise, space-conscious, micropower and general purpose
solution for any kind of system requiring supply monitors.
trademark of Linear Technology Corporation. All other trademarks are the property of their
respective owners. *Patent pending.
, LTC and LT are registered trademarks of Linear Technology Corporation. ThinSOT is a
Six Input Supply Monitor
®
2908 is a six input supply monitor for systems
U
0.3
0.2
0.1
0.4
0
0
with 10k Pull-Up Resistor to V1
RST Output Voltage vs V1
0.2
V2 = V1 (A1/B1)
V1 INPUT
V1 (V)
0.4
Precision
V2 = GND
V3 = V4 = V
V
V
ADJ2
ADJ4
LTC2908
= V
= V
0.6
ADJ3
ADJ5
ADJ1
2908 TA01b
=
= GND
=
0.8
2908fb
1

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ltc2908its8-c1-trpbf Summary of contents

Page 1

... This product provides a pre- cise, space-conscious, micropower and general purpose 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. All other trademarks are the property of their respective owners. *Patent pending. ...

Page 2

... LTC2908CTS8- ADJ1 LTC2908ITS8- ADJ2 TS8 PART MARKING = 250° LTBFJ LTBFK LTBFM LTBFN ORDER PART NUMBER TOP VIEW LTC2908CTS8- ADJ1 LTC2908ITS8- ADJ2 6 V ADJ3 5 V ADJ4 TS8 PART MARKING = 250° LTCFT LTCFT 2908fb ...

Page 3

ELECTRICAL CHARACTERISTICS operating temperature range, otherwise specifications are T SYMBOL PARAMETER V 5V, 5% Reset Threshold RT50 V 3.3V, 5% Reset Threshold RT33 V 2.5V, 5% Reset Threshold RT25 V 1.8V, 5% Reset Threshold RT18 V ADJ, 5% Reset Threshold ...

Page 4

LTC2908 ELECTRICAL CHARACTERISTICS The ● denotes specifications which apply over the full operating temperature range, otherwise specifications are T for the LT2908-A1 3.3V for the LTC2908- SYMBOL PARAMETER t Reset Time-Out Period RST t V ...

Page 5

W U TYPICAL PERFOR A CE CHARACTERISTICS Specifications are 25°C unless otherwise noted. A 1.8V Threshold Voltage vs Temperature 1.710 1.700 1.690 1.680 1.670 1.660 50 100 –50 – TEMPERATURE (°C) 2908 G04 I ...

Page 6

LTC2908 W U TYPICAL PERFOR A CE CHARACTERISTICS Specifications are 25°C unless otherwise noted. A RST Output Voltage vs V1 with 10k Pull-Up Resistor (A1/B1 2.5V (A1)/V3 = 1.8V ...

Page 7

W U TYPICAL PERFOR A CE CHARACTERISTICS Specifications are 25°C unless otherwise noted. A RST Pull-Up Current vs Supply Voltage – (A1/B1 V1(C1 2.5V (A1)/V3 = ...

Page 8

LTC2908 CTIO S (TS8 Package/DDB8 Package) LTC2908-C1 V1 (Pin 1/Pin 4): Voltage Input the internal V operating voltage on this pin shall not exceed 6V. When in normal operation, this pin draws ...

Page 9

W BLOCK DIAGRA ADJ1 V ADJ2 V ADJ3 V ADJ4 V ADJ5 GND DIAGRA – – – – – – C6 ...

Page 10

LTC2908 U U APPLICATIO S I FOR ATIO Supply Monitoring The LTC2908 is a low power, high accuracy, six input supply monitoring circuit with two adjustable inputs. The reset delay is set to a nominal of 200ms with an internal ...

Page 11

U U APPLICATIO S I FOR ATIO Adjustable Input The noninverting input on the V ADJ 0.5V. And the high impedance inverting input directly ties to the V pin. ADJ In a typical application, this pin connects to a tap ...

Page 12

LTC2908 U U APPLICATIO S I FOR ATIO With this variation of reset threshold in mind, the nominal reset threshold of the supervisor resides below the minimum supply voltage; just enough so that the reset threshold band and the power ...

Page 13

U U APPLICATIO S I FOR ATIO RST Output Characteristics The DC characteristics of the RST pull-up and pull-down strength are shown in the Typical Performance Character- istics section. The RST output has a weak internal pull- ...

Page 14

LTC2908 U TYPICAL APPLICATIO S Quad Supply Monitor with One Adjustable Input, 5% Tolerance, 3.3V, 2.5V, 1.8V, 1.2V Pin Programmable Dual Supply Monitor with Possible Future Expansion up to Six Supplies, 5% Tolerance, 3.3V and 2.5V Six Supply Monitor, 5% ...

Page 15

... DRAWING NOT TO SCALE 3. DIMENSIONS ARE INCLUSIVE OF PLATING Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen- tation that the interconnection of its circuits as described herein will not infringe on existing patent rights. U DDB Package 8-Lead Plastic DFN (3mm × ...

Page 16

... Tolerances, 8-Lead SOT-23 and DFN Packages 0.5V Adjustable Threshold, Reset and Three Supply Tolerances, 8-Lead SOT-23 and DFN Packages Shunt Regulated V Pin, Adjustable Threshold and CC Reset, 8-Lead SOT-23 and DFN Packages LT 0106 REV B • PRINTED IN USA © LINEAR TECHNOLOGY CORPORATION 2004 2908fb ...

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