Timing Silicon Oscillators
Timing TimerBlox
 Timing Extended Temperature (H & MP) Timing

LTC2997 - Remote/Internal Temperature Sensor

LTC6991 - TimerBlox: Resettable, Low Frequency Oscillator

Features

  • Period Range: 1ms to 9.5 Hours
  • Configured with 1 to 3 Resistors
  • <1.5% Maximum Frequency Error
  • Output Reset Function
  • 2.25V to 5.5V Single Supply Operation
  • 55μA to 80μA Supply Current 2ms to 9.5hr Clock Period)
  • 500μs Start-Up Time
  • CMOS Output Driver Sources/Sinks 20mA
  • –55°C to 125°C Operating Temperature Range
  • Available in Low Profile (1mm) SOT-23 (ThinSOT™) and 2mm × 3mm DFN Packages
  • Click here to start your design with the LTC6991 Online Design Tool!
Designed for Automotive and Transportation Applications
AEC-Q100 data available for specific packages

Typical Application

LTC6991 Typical Application
LTC6991 Typical Application

Description

The LTC®6991 is a silicon oscillator with a programmable period range of 1.024ms to 9.54 hours (29.1μHz to 977Hz), specifically intended for long duration timing events. The LTC6991 is part of the TimerBlox® family of versatile silicon timing devices.

A single resistor, RSET , programs the LTC6991’s internal master oscillator frequency. The output clock period is determined by this master oscillator and an internal frequency divider, NDIV , programmable to eight settings from 1 to 221.

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
LTC6991CDCB#PBF 2x3 DFN-6 DCB C 05-08-1715 Yes
LTC6991CDCB#TRMPBF 2x3 DFN-6 DCB C 05-08-1715 Yes
LTC6991CDCB#TRPBF 2x3 DFN-6 DCB C 05-08-1715 Yes
LTC6991CS6#PBF SOT-23 S6 C 05-08-1636 Yes
LTC6991CS6#TRMPBF SOT-23 S6 C 05-08-1636 Yes
LTC6991CS6#TRPBF SOT-23 S6 C 05-08-1636 Yes
LTC6991HDCB#PBF 2x3 DFN-6 DCB H 05-08-1715 Yes
LTC6991HDCB#TRMPBF 2x3 DFN-6 DCB H 05-08-1715 Yes
LTC6991HDCB#TRPBF 2x3 DFN-6 DCB H 05-08-1715 Yes
LTC6991HS6#PBF SOT-23 S6 H 05-08-1636 Yes
LTC6991HS6#TRMPBF SOT-23 S6 H 05-08-1636 Yes
LTC6991HS6#TRPBF SOT-23 S6 H 05-08-1636 Yes
LTC6991IDCB#PBF 2x3 DFN-6 DCB I 05-08-1715 Yes
LTC6991IDCB#TRMPBF 2x3 DFN-6 DCB I 05-08-1715 Yes
LTC6991IDCB#TRPBF 2x3 DFN-6 DCB I 05-08-1715 Yes
LTC6991IS6#PBF SOT-23 S6 I 05-08-1636 Yes
LTC6991IS6#TRMPBF SOT-23 S6 I 05-08-1636 Yes
LTC6991IS6#TRPBF SOT-23 S6 I 05-08-1636 Yes
LTC6991MPS6#PBF SOT-23 S6 MP 05-08-1636 Yes
LTC6991MPS6#TRMPBF SOT-23 S6 MP 05-08-1636 Yes
LTC6991MPS6#TRPBF SOT-23 S6 MP 05-08-1636 Yes


LTC6991 Package Drawing
LTC6991 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
LTC6991CDCB#PBF 2x3 DFN-6 C $1.88 Yes
LTC6991CDCB#TRMPBF 2x3 DFN-6 C $1.88 $1.40 Yes
LTC6991CDCB#TRPBF 2x3 DFN-6 C $1.88 $1.35 Yes
LTC6991CS6#PBF SOT-23 C $1.88 Yes
LTC6991CS6#TRMPBF SOT-23 C $1.88 $1.40 Yes
LTC6991CS6#TRPBF SOT-23 C $1.88 $1.35 Yes
LTC6991HDCB#PBF 2x3 DFN-6 H $2.63 Yes
LTC6991HDCB#TRMPBF 2x3 DFN-6 H $2.63 $1.94 Yes
LTC6991HDCB#TRPBF 2x3 DFN-6 H $2.63 $1.89 Yes
LTC6991HS6#PBF SOT-23 H $2.16 Yes
LTC6991HS6#TRMPBF SOT-23 H $2.63 $1.94 Yes
LTC6991HS6#TRPBF SOT-23 H $2.63 $1.89 Yes
LTC6991IDCB#PBF 2x3 DFN-6 I $2.16 Yes
LTC6991IDCB#TRMPBF 2x3 DFN-6 I $2.16 $1.60 Yes
LTC6991IDCB#TRPBF 2x3 DFN-6 I $2.16 $1.55 Yes
LTC6991IS6#PBF SOT-23 I $2.16 Yes
LTC6991IS6#TRMPBF SOT-23 I $2.16 $1.60 Yes
LTC6991IS6#TRPBF SOT-23 I $2.16 $1.55 Yes
LTC6991MPS6#PBF SOT-23 MP $5.64 Yes
LTC6991MPS6#TRMPBF SOT-23 MP $5.64 $4.10 Yes
LTC6991MPS6#TRPBF SOT-23 MP $5.64 $4.05 Yes
Buy Now • Request Samples
* 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.

Part Number Description Price Documentation
DC1562B-B LTC6991 Demo Board | 1Hz (1s) Fixed Frequency $25.00
Buy Now
Click here to view our complete list of demo boards

Designed for Automotive and Transportation Applications

AEC-Q100 data is available for these specific part numbers. Please contact your local sales representative for more information regarding reliability reports or to inquire about parts that are not included. For more information, view our Automotive and Transportation page

Part Number Package Temp Price
(1-99)		 Price
(1k)*		 RoHS
LTC6991HS6#PBF SOT-23 H $2.16 Yes
LTC6991HS6#TRMPBF SOT-23 H $2.63 $1.94 Yes
LTC6991HS6#TRPBF SOT-23 H $2.63 $1.89 Yes
LTC6991IS6#PBF SOT-23 I $2.16 Yes
LTC6991IS6#TRMPBF SOT-23 I $2.16 $1.60 Yes
LTC6991IS6#TRPBF SOT-23 I $2.16 $1.55 Yes
LTC6991MPS6#PBF SOT-23 MP $5.64 Yes
LTC6991MPS6#TRMPBF SOT-23 MP $5.64 $4.10 Yes
LTC6991MPS6#TRPBF SOT-23 MP $5.64 $4.05 Yes
Buy Now • Request Samples
* 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.

Applications

  • “Heartbeat” Timers
  • Watchdog Timers
  • Intervalometers
  • Periodic “Wake-Up” Call
  • High Vibration, High Acceleration Environments
  • Portable and Battery-Powered Equipment
 

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Design Tools

LTspice

LTspice® software is a powerful, fast and free simulation tool, schematic capture and waveform viewer with enhancements and models for improving the simulation of switching regulators. Click here to download LTspice

To launch a ready to run LTspice demonstration circuit for this part:

To explore other ready to run LTspice demonstration circuits, please visit our Demo Circuits Collection.

Models for the following parts are available in LTspice:
LTC6991

LTC6691 Online Design Tool

The LTC6991 Online Design Tool is a synthesis and configuration tool that allows you to:

  • Select the frequency and duty cycle of operation
  • Calculate the required external component values
  • Export to LTspice for simulation

Click here to start your design with the LTC6991 Online Design Tool

TimerBlox Designer (MS Excel)

Use this Excel based tool to speed your designs with the LTC6990, LTC6991, LTC6992, LTC6993, LTC6994 and LTC6995

Click here to download TimerBlox Designer

Technical Support