LTC6991
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LTC6991

TimerBlox: Resettable, Low Frequency Oscillator

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Part Details
Part Models 18
1ku List Price Starting From $1.72
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
  • AEC-Q100 Qualified for Automotive Applications
Additional Details
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The LTC6991 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.

In normal operation, the LTC6991 oscillates with a 50% duty cycle. A reset function is provided to truncate the pulse (reducing the duty cycle). The reset pin can also be used to prevent the output from oscillating.

The RST and OUT pins can be configured for active-low or active-high operation using a polarity function.

POL Bit RST Pin Output State
0 0 Oscillating
0 1 0 (reset)
1 0 1 (reset)
1 1 Oscillating

Applications

  • “Heartbeat” Timers
  • Watchdog Timers
  • Intervalometers
  • Periodic “Wake-Up” Call
  • High Vibration, High Acceleration Environments
  • Portable and Battery-Powered Equipment
Part Models 18
1ku List Price Starting From $1.72

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Documentation

Documentation

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Part Model Pin/Package Drawing Documentation CAD Symbols, Footprints, and 3D Models
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Product Lifecycle

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Jun 30, 2020

- 20_0244

Notification of Wafer Fab Location Change for 0.6µm CMOS Process Devices from ADI Milpitas (Hillview) to Vanguard Int. (Taiwan)

LTC6991CDCB#TRMPBF

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Jun 30, 2020

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Notification of Wafer Fab Location Change for 0.6µm CMOS Process Devices from ADI Milpitas (Hillview) to Vanguard Int. (Taiwan)

LTC6991CDCB#TRMPBF

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LTC6991CDCB#TRPBF

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LTC6991CS6#TRMPBF

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LTC6991CS6#TRPBF

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Software & Part Ecosystem

Software & Part Ecosystem

Evaluation Kit

Evaluation Kits 1

reference details image

DC1562B-B

LTC6991 Demo Board | 1Hz (1s) Fixed Frequency

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DC1562B-B

LTC6991 Demo Board | 1Hz (1s) Fixed Frequency

LTC6991 Demo Board | 1Hz (1s) Fixed Frequency

Product Detail

Demonstration circuit 1562B is an engineering tool to design and evaluate the LTC699X-X family of TimerBlox® circuits. The center section of the board contains a preconfigured TimerBlox function. DC1562B comes in twelve timing function variations as outlined in Table 1.


 


 


Tools & Simulations

Tools & Simulations 2

LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.

To launch ready-to-run LTspice demonstration circuits for this part:

Step 1: Download and install LTspice on your computer.

Step 2: Click on the link in the section below to download a demonstration circuit.

Step 3: If LTspice does not automatically open after clicking the link below, you can instead run the simulation by right clicking on the link and selecting “Save Target As.” After saving the file to your computer, start LTspice and open the demonstration circuit by selecting ‘Open’ from the ‘File’ menu.

Reference Designs

Reference Designs 4

Figure 1. Simplified Block Diagram of EVAL-CN0534-EBZ

USB Powered 5.8 GHz RF LNA Receiver with Output Power Protection

zoomopens a dialog

CN0534

USB Powered 5.8 GHz RF LNA Receiver with Output Power Protection

CN0534

Circuits from the lab

tooltip Info:Circuits from the lab
USB Powered 5.8 GHz RF LNA Receiver with Output Power Protection

Features and Benefits

  • 23.5 dB Gain
  • 5.8 GHz Optimized LNA
  • ISM Band Operation
  • USB Powered
View Detailed Reference Design external link

Design & Integration Tools

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ZIP

2.72 M

Videos

Thumbnail Image

May 25, 2022

01:01

CN0534:5.8GHzに対応するUSB駆動のRFレシーバー、GaAsベースのLNAや出力電力保護機能を搭載

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Jan 24, 2022

01:01

CN0534: USB Powered 5.8 GHz RF LNA w/ Output Power Protection

Thumbnail Image

Mar 02, 2022

01:09

CN0534:USB供电的5.8 GHz RF LNA,带输出电源保护

Figure 1. CN0521 Simplified Block Diagram

USB-Powered, 2.4 GHz RF Low Noise Amplifier Receiver with Overpower Protection Circuit

zoomopens a dialog

CN0521

USB-Powered, 2.4 GHz RF Low Noise Amplifier Receiver with Overpower Protection Circuit

CN0521

Circuits from the lab

tooltip Info:Circuits from the lab
USB-Powered, 2.4 GHz RF Low Noise Amplifier Receiver with Overpower Protection Circuit

Features and Benefits

  • +26 dB of Rx Signal Gain
  • 50 ohm Input and Output Impedance
  • Overvoltage Input Protection
  • SMA Input and Output Connectors
  • USB Powered
View Detailed Reference Design external link

Design & Integration Tools

pdf icon

ZIP

8.71 M

Figure 1. CN0518 Simplified Block Diagram

USB-Powered, 915 MHz RF Low Noise Amplifier Receiver with Overpower Protection Circuit

zoomopens a dialog

CN0518

USB-Powered, 915 MHz RF Low Noise Amplifier Receiver with Overpower Protection Circuit

CN0518

Circuits from the lab

tooltip Info:Circuits from the lab
USB-Powered, 915 MHz RF Low Noise Amplifier Receiver with Overpower Protection Circuit

Features and Benefits

  • +25 dB of Rx Signal Gain
  • 50 ohm Input and Output Impedance
  • Overvoltage Input Protection
  • SMA Input and Output Connectors
  • USB Powered
View Detailed Reference Design external link

Design & Integration Tools

pdf icon

ZIP

8.21 M

Figure 1. CN0555 Simplified Block Diagram

USB-Powered, 433.92 MHz RF Low Noise Amplifier Receiver with Overpower Protection

zoomopens a dialog

CN0555

USB-Powered, 433.92 MHz RF Low Noise Amplifier Receiver with Overpower Protection

CN0555

Circuits from the lab

tooltip Info:Circuits from the lab
USB-Powered, 433.92 MHz RF Low Noise Amplifier Receiver with Overpower Protection

Features and Benefits

  • Optimized to Receive the 433MHz ISM Band
  • Receive Gain of 40dB
  • Overvoltage Protection Circuit with Automatic Turn off/on
  • Powered from a USB cable
View Detailed Reference Design external link

Design & Integration Tools

pdf icon

ZIP

3.54 M

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