LTC2908CDDB-A1#PBF Linear Technology, LTC2908CDDB-A1#PBF Datasheet

LTC2908CDDB-A1#PBF

Manufacturer Part Number

LTC2908CDDB-A1#PBF

Description

Manufacturer

Linear Technology

Datasheet

1.LTC2908CDDB-A1PBF.pdf (16 pages)

Specifications of LTC2908CDDB-A1#PBF

Voltage Supervisor Type

Voltage Monitor

Number Of Voltage Supervisors

Operating Supply Voltage (min)

0.5V

Operating Supply Voltage (max)

Package Type

DFN

Operating Temperature Classification

Commercial

Operating Temp Range

0C to 70C

Pin Count

Mounting

Surface Mount

Lead Free Status / RoHS Status

Compliant

Available stocks

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Part Number

Manufacturer

Quantity

Price

Company:

Part Number:

LTC2908CDDB-A1#PBFLTC2908CDDB-A1

Manufacturer:

Quantity:

10 000

Company:

Part Number:

LTC2908CDDB-A1#PBFLTC2908CDDB-A1#TRMPBF

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18 500

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APPLICATIONS

TYPICAL APPLICATION

FEATURES

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: ±1.5% of

Monitored Voltage Over Temperature

Internal V

Power Supply Glitch Immunity

200ms Reset Time Delay

Active Low Open-Drain RST Output

Low Proﬁ le (1mm) 8-Lead SOT-23 (ThinSOT™) and

Plastic (3mm × 2mm) DFN Packages

Network Servers

Wireless Base Stations

Optical Networking Systems

Multivoltage Systems

Desktop and Notebook Computers

DC/DC

12V

3.3V

2.5V

1.8V

1.5V

1.2V

Six Supply Monitor with 5% Tolerance

Auto Select

(12V, 3.3V, 2.5V, 1.8V, 1.5V, 1.2V)

0.1μF

V2 V3 V4

LTC2908-B1

GND

= 0.5V Guaranteed*

2.15M

ADJ1

100k

124k

ADJ2

RST

100k

2908 TA01a

SYSTEM

DESCRIPTION

The LTC

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.

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 nominal

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.

is a trademark of Linear Technology Corporation. All other trademarks are the property of

their respective owners. *Patent pending.

, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. ThinSOT

Six Input Supply Monitor

2908 is a six input supply monitor for systems

0.3

0.4

0.2

0.1

with 10k Pull-Up Resistor to V1

RST Output Voltage vs V1

0.2

V2 = V1 (A1/B1)

V1 INPUT

V1 (V)

0.4

V2 = GND

V3 = V4 = V

ADJ2

ADJ4

Precision

LTC2908

= V

0.6

ADJ3

ADJ5

ADJ1

= GND

2908 TA01b

0.8

2908fc

Related parts for LTC2908CDDB-A1#PBF

LTC2908CDDB-A1#PBF Summary of contents

Page 1

... 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. SYSTEM ...

Page 2

... JMAX JA EXPOSED PAD (PIN 9) (PCB CONNECTION OPTIONAL) ORDER INFORMATION Lead Free Finish TAPE AND REEL (MINI) TAPE AND REEL LTC2908CDDB-A1#TRMPBF LTC2908CDDB-A1#TRMPBF LTC2908IDDB-A1#TRMPBF LTC2908IDDB-A1#TRMPBF LTC2908CDDB-B1#TRMPBF LTC2908CDDB-B1#TRMPBF LTC2908IDDB-B1#TRMPBF LTC2908IDDB-B1#TRMPBF LTC2908CDDB-C1#TRMPBF LTC2908CDDB-C1#TRMPBF LTC2908IDDB-C1#TRMPBF LTC2908IDDB-C1#TRMPBF LTC2908CTS8-A1#TRMPBF LTC2908CTS8-A1#TRMPBF LTC2908ITS8-A1#TRMPBF LTC2908ITS8-A1#TRMPBF LTC2908CTS8-B1#TRMPBF LTC2908CTS8-B1#TRMPBF LTC2908ITS8-B1#TRMPBF LTC2908ITS8-B1#TRMPBF ...

Page 3

ELECTRICAL CHARACTERISTICS operating temperature range, otherwise speciﬁ cations 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 ...

Page 4

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

Page 5

TYPICAL PERFORMANCE CHARACTERISTICS Speciﬁ cations 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 – TEMPERATURE (°C) 2908 G04 I vs Temperature V1 33 ...

Page 6

LTC2908 TYPICAL PERFORMANCE CHARACTERISTICS Speciﬁ cations 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 (B1 ...

Page 7

TYPICAL PERFORMANCE CHARACTERISTICS Speciﬁ cations are 25°C unless otherwise noted. A RST Pull-Up Current vs Supply Voltage – (A1/B1 V1(C1 2.5V (A1)/V3 = 1.8V (B1) V4 ...

Page 8

LTC2908 PIN FUNCTIONS (TS8 Package/DDB8 Package) LTC2908-C1 V1 (Pin 1/Pin 4): Voltage Input the internal V The operating voltage on this pin shall not exceed 6V. When in normal operation, this pin draws approximately 22μA. Bypass this ...

Page 9

BLOCK DIAGRAMS V1 V ADJ1 V ADJ2 V ADJ3 V ADJ4 V ADJ5 GND TIMING DIAGRAM RST – – – – – – BANDGAP REFERENCE V Monitor Timing ...

Page 10

LTC2908 APPLICATIONS INFORMATION 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 capacitor, eliminating the need for ...

Page 11

APPLICATIONS INFORMATION 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 point on an external resistive ...

Page 12

LTC2908 APPLICATIONS INFORMATION With this variation of reset threshold in mind, the nomi- nal reset threshold of the supervisor resides below the minimum supply voltage; just enough so that the reset threshold band and the power supply tolerance bands do ...

Page 13

APPLICATIONS INFORMATION 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- Max(V1, V2) and a strong ...

Page 14

LTC2908 TYPICAL APPLICATIONS 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% Tolerance 12V, ...

Page 15

... 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 representa- tion that the interconnection of its circuits as described herein will not infringe on existing patent rights. 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 0708 REV C • PRINTED IN USA © LINEAR TECHNOLOGY CORPORATION 2004 2908fc ...

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