LTC1985-1.8 데이터 시트보기 (PDF) - Linear Technology

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LTC1985-1.8

Micropower Precision Triple Supply Monitor with Push-Pull Reset Output in a 5-Lead SOT-23 Package

Linear Technology 

LTC1985-1.8

Micropower Precision

Triple Supply Monitor

with Push-Pull Reset Output

in a 5-Lead SOT-23 Package

FEATURES

s Monitors Three Inputs Simultaneously:

3V, 1.8V and Adjustable

s ±1.5% Threshold Accuracy Over Temperature

s Very Low Supply Current: 10µA Typ

s 200ms Reset Time Delay

s Power Supply Glitch Immunity

s Guaranteed RESET for VCC3 ≥ 1V or VCC18 ≥ 1V

s 3V Active-Low Push-Pull Reset Output

s 5-Lead SOT-23 Package

U

APPLICATIO S

s Desktop Computers

s Notebook Computers

s Intelligent Instruments

s Portable Battery-Powered Equipment

s Network Servers

DESCRIPTIO

The LTC®1985-1.8 is a triple supply monitor intended for

systems with multiple supply voltages. The reset output

remains low until all three supplies have been in compli-

ance for 200ms. Tight 1.5% accuracy specifications and

glitch immunity ensure reliable reset operation without

false triggering.

The RST output is guaranteed to be in the correct state for

VCC18 or VCC3 down to 1V. The LTC1985 may also be

configured to monitor any one or two VCC inputs instead

of three, depending on system requirements.

Very low (10µA typical) supply current makes the LTC1985

ideal for power conscious systems.

The LTC1985 is available in a 5-lead SOT-23 package.

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

TYPICAL APPLICATION

3V

DC/DC 1.8V

CONVERTER 2.5V

0.1µF

0.1µF

SYSTEM

LOGIC

1

5

RST

VCC3

LTC1985-1.8

4

R1

VCC18

130k

1% 3

R2

VCCA

100k

GND

1%

2

1985-1.8 TA01

1

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