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
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
For complete and up to date package information and drawings, please refer to our packaging page
SOT-23, DFN-6
Order Info
- Part numbers ending in PBF are lead free. Please contact LTC marketing for information on lead based finish parts.
- 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 | Pins | Temp | Price (1-99) | Price (1k)* | RoHS Data |
|---|---|---|---|---|---|---|
| LTC6991CDCB#PBF | DFN | 6 | C | $1.88 | View | |
| LTC6991CDCB#TRMPBF | DFN | 6 | C | $1.88 | $1.40 | View |
| LTC6991CDCB#TRPBF | DFN | 6 | C | $1.88 | $1.35 | View |
| LTC6991CS6#PBF | SOT | 6 | C | $1.88 | View | |
| LTC6991CS6#TRMPBF | SOT | 6 | C | $1.88 | $1.40 | View |
| LTC6991CS6#TRPBF | SOT | 6 | C | $1.88 | $1.35 | View |
| LTC6991HDCB#PBF | DFN | 6 | H | $2.63 | View | |
| LTC6991HDCB#TRMPBF | DFN | 6 | H | $2.63 | $1.94 | View |
| LTC6991HDCB#TRPBF | DFN | 6 | H | $2.63 | $1.89 | View |
| LTC6991HS6#PBF | SOT | 6 | H | $2.16 | View | |
| LTC6991HS6#TRMPBF | SOT | 6 | H | $2.63 | $1.94 | View |
| LTC6991HS6#TRPBF | SOT | 6 | H | $2.63 | $1.89 | View |
| LTC6991IDCB#PBF | DFN | 6 | I | $2.16 | View | |
| LTC6991IDCB#TRMPBF | DFN | 6 | I | $2.16 | $1.60 | View |
| LTC6991IDCB#TRPBF | DFN | 6 | I | $2.16 | $1.55 | View |
| LTC6991IS6#PBF | SOT | 6 | I | $2.16 | View | |
| LTC6991IS6#TRMPBF | SOT | 6 | I | $2.16 | $1.60 | View |
| LTC6991IS6#TRPBF | SOT | 6 | I | $2.16 | $1.55 | View |
| LTC6991MPS6#PBF | SOT | 6 | MP | $5.64 | View | |
| LTC6991MPS6#TRMPBF | SOT | 6 | MP | $5.64 | $4.10 | View |
| LTC6991MPS6#TRPBF | SOT | 6 | MP | $5.64 | $4.05 | View |
| Buy Now • Request Samples | ||||||
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 |
|---|---|---|---|
| DC1562A-B | LTC6991: 1Hz (1s) Fixed Frequency | $25.00 | |
| Buy Now | |||
Applications
- “Heartbeat” Timers
- Watchdog Timers
- Intervalometers
- Periodic “Wake-Up” Call
- High Vibration, High Acceleration Environments
- Portable and Battery-Powered Equipment
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Simulate
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Related models available in LTspice IV
LTC6991
TimerBlox Designer is an Excel based selection and synthesis tool that allows you to choose and configure the TimerBlox part best suited for your application.
- Download and open TimerBlox Designer
- Enable Macros
- Choose the appropriate timing function and parameters
Technical Support
- For immediate technical assistance, contact your local sales office or distributor or call 1-800-4-LINEAR (US customers only) or 408-432-1900.
- For less urgent requests, please complete our Technical Support Request Form. Please allow 2-3 business days for reply.
