Monitor, Control and Protection Supervisory Circuits Triple Supply Monitors

LTC1985-1.8 - Micropower Precision Triple Supply Monitor with Push-Pull Reset Output in a 5-Lead SOT-23 Package

Features

  • Monitors Three Inputs Simultaneously:
    3V, 1.8V and Adjustable
  • ±1.5% Threshold Accuracy Over Temperature
  • Very Low Supply Current: 10µA Typ
  • 200ms Reset Time Delay
  • Power Supply Glitch Immunity
  • Guaranteed RESET for VCC3 >/= 1V or VCC18 >/= 1V
  • 3V Active-Low Push-Pull Reset Output
  • 5-Lead SOT-23 Package

Typical Application

LTC1985-1.8 Typical Application

Description

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 compliance 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.

Packaging

CAD Symbols and Footprints: The downloadable Zip file below contains the schematic symbol and PCB footprints.

For complete and up to date package information and drawings, please refer to our packaging page

Part Number Package Code Temp Package
Drawing		 RoHS
LTC1985ES5-1.8#PBF SOT-23 S5 E 05-08-1635 Yes
LTC1985ES5-1.8#TRMPBF SOT-23 S5 E 05-08-1635 Yes
LTC1985ES5-1.8#TRPBF SOT-23 S5 E 05-08-1635 Yes


LTC1985-1.8 Package Drawing

Order Info

  • Part numbers ending in PBF are lead free. Solder plated terminal finish (SnPb) versions are non-standard and special terms and conditions and pricing applies if available. Please contact LTC marketing for information.
  • Part numbers containing TR or TRM are shipped in tape and reel or 500 unit mini tape and reel, respectively
  • Please refer to our general ordering information or the product datasheet for more details

Package Variations and Pricing

Part Number Package Temp Price
(1-99)		 Price
(1k)*		 RoHS
LTC1985ES5-1.8#PBF SOT-23 E $1.66 Yes
LTC1985ES5-1.8#TRMPBF SOT-23 E $1.66 $1.43 Yes
LTC1985ES5-1.8#TRPBF SOT-23 E $1.66 $1.41 Yes
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* The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Linear Technology sales office or authorized distributor.

Demo Boards

Linear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.

Click here to view our complete list of demo boards

Applications

  • Desktop Computers
  • Notebook Computers
  • Intelligent Instruments
  • Portable Battery-Powered Equipment
  • Network Servers

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