LTC1985ES5-1.8 Linear Technology, LTC1985ES5-1.8 Datasheet

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LTC1985ES5-1.8

Manufacturer Part Number
LTC1985ES5-1.8
Description
Micropower Precision Triple Supply Monitor with Push-Pull Reset Output in a 5-Lead SOT-23 Package
Manufacturer
Linear Technology
Datasheet

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FEATURES
TYPICAL APPLICATIO
APPLICATIO S
Monitors Three Inputs Simultaneously:
Very Low Supply Current: 10 A Typ
200ms Reset Time Delay
Power Supply Glitch Immunity
Guaranteed RESET for V
3V Active-Low Push-Pull Reset Output
5-Lead SOT-23 Package
Desktop Computers
Notebook Computers
Intelligent Instruments
Portable Battery-Powered Equipment
Network Servers
1.5% Threshold Accuracy Over Temperature
3V, 1.8V and Adjustable
U
CC3
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.
1V or V
U
CONVERTER
DC/DC
CC18
0.1 F
3V
1.8V
2.5V
1V
0.1 F
in a 5-Lead SOT-23 Package
with Push-Pull Reset Output
DESCRIPTIO
The LTC
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
V
configured to monitor any one or two V
of three, depending on system requirements.
Very low (10 A typical) supply current makes the LTC1985
ideal for power conscious systems.
The LTC1985 is available in a 5-lead SOT-23 package.
R1
130k
1%
R2
100k
1%
CC18
, LTC and LT are registered trademarks of Linear Technology Corporation.
5
4
3
or V
V
V
V
CC3
CC18
CCA
LTC1985-1.8
®
1985-1.8 is a triple supply monitor intended for
SYSTEM
LOGIC
Micropower Precision
GND
RST
CC3
Triple Supply Monitor
1
2
down to 1V. The LTC1985 may also be
1985-1.8 TA01
U
Final Electrical Specifications
LTC1985-1.8
CC
March 2000
inputs instead
1

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LTC1985ES5-1.8 Summary of contents

Page 1

... TYPICAL APPLICATIO CONVERTER 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. with Push-Pull Reset Output ...

Page 2

... but are not tested at these temperatures. Note 4: Both V and V CC3 has the greatest potential ORDER PART NUMBER 5 V CC3 LTC1985ES5-1 CC18 S5 PART MARKING = 250 C/W LTNM unless otherwise noted. CCA CC3 MIN TYP MAX 2 ...

Page 3

W U TYPICAL PERFOR A CE CHARACTERISTICS I vs Temperature VCC3 – –40 – TEMPERATURE ( C) 1985-18 G01 V Threshold Voltage ...

Page 4

LTC1985-1 CTIO S RST (Pin 1): Reset Logic Output. Active low, 3V push- pull output. Asserted when one or all of the supplies are below trip thresholds and held for 200ms after all sup- plies ...

Page 5

DIAGRA V CCX RST U U APPLICATIO S I FOR ATIO Supply Monitoring The LTC1985 is a low power, high accuracy triple supply monitoring cirucit with a single 200ms microprocessor reset output. All three ...

Page 6

LTC1985-1.8 U TYPICAL APPLICATIO S ADJUSTABLE SUPPLY OR DC/DC FEEDBACK ADJUSTABLE SUPPLY 6 Triple Supply Monitor (3V, 1.8V and Adjustable) LTC1985-1 RST CC3 4 1.8V V CC18 R1 CCA 2 DIVIDER R2* GND *TO PRESERVE ...

Page 7

U TYPICAL APPLICATIO S Resistor on RST Output to Ground Ensures RST Valid to V Typical Application Showing Resistor on RST Output to Ground LTC1985-1 CC3 4 1.8V V CC18 R1 3 ADJUSTABLE V CCA SUPPLY 2 ...

Page 8

... Threshold 4.725V, 3.118V, 1V Thresholds ( 0.75%) 2.363V, 3.118V, 1V Thresholds ( 0.75%) Meets PCI t Timing Specifications FAIL Adjustable RESET and Watchdog Time Outs Adjustable RESET and Watchdog Time Outs Individual Monitor Outputs 5-Lead SOT-23 Package 1985i LT/TP 0300 4K • PRINTED IN THE USA LINEAR TECHNOLOGY CORPORATION 2000 ...

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