LTC695-3.3 - 3.3V Microprocessor Supervisory Circuits
Features
- Guaranteed Reset Assertion at VCC = 1V
- Pin Compatible with LTC694/LTC695 for 3.3V Systems
- 200μA Typical Supply Current
- Fast (30ns Typ) Onboard Gating of RAM Chip Enable Signals
- SO-8 and S16 Packages
- 2.90V Precision Voltage Monitor
- Power OK/Reset Time Delay: 200ms or Adjustable
- Minimum External Component Count
- 1μA Maximum Standby Current
- Voltage Monitor for Power-Fail or Low-Battery Warning
- Thermal Limiting
- Performance Specified Over Temperature
Typical Application
Description
The LTC®694-3.3/LTC695-3.3 provide complete 3.3V power supply monitoring and battery control functions. These include power-on reset, battery back-up, RAM write protection, power failure warning and watchdog timing. The devices are pin compatible upgrades of the LTC694/LTC695 that are optimized for 3.3V systems. Operating power consumption has been reduced to 0.6mW (typical) and 3μW maximum in battery back-up mode. Microprocessor reset and memory write protection are provided when the supply falls below 2.9V. The RESET output is guaranteed to remain logic low with VCC as low as 1V.
The LTC694-3.3/LTC695-3.3 power the active RAMs with a charge pumped NMOS power switch to achieve low dropout and low supply current. When primary power is lost, auxiliary power, connected to the battery input pin, powers the RAMs in standby through an efficient PMOS switch.
For an early warning of impending power failure, the LTC694-3.3/LTC695-3.3 provide an internal comparator with a user-defined threshold. An internal watchdog timer is also available, which forces the reset pins to active states when the watchdog input is not toggled prior to a preset timeout period.
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 |
|---|---|---|---|---|---|
| LTC695CN-3.3#PBF | N-16 | N | C | 05-08-1510 (N16) | Yes |
| LTC695CSW-3.3#PBF | SW-16 | SW | C | 05-08-1620 (SW16) | Yes |
| LTC695CSW-3.3#TRPBF | SW-16 | SW | C | 05-08-1620 (SW16) | Yes |
| LTC695IN-3.3#PBF | N-16 | N | I | 05-08-1510 (N16) | Yes |
| LTC695ISW-3.3#PBF | SW-16 | SW | I | 05-08-1620 (SW16) | Yes |
| LTC695ISW-3.3#TRPBF | SW-16 | SW | I | 05-08-1620 (SW16) | Yes |
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 | |
|---|---|---|---|---|---|---|
| LTC695CN-3.3#PBF | N-16 | C | $4.92 | $4.00 | Yes | |
| LTC695CSW-3.3#PBF | SW-16 | C | $5.42 | $4.40 | Yes | |
| LTC695CSW-3.3#TRPBF | SW-16 | C | $4.46 | Yes | ||
| LTC695IN-3.3#PBF | N-16 | I | $6.42 | $5.20 | Yes | |
| LTC695ISW-3.3#PBF | SW-16 | I | $7.08 | $5.75 | Yes | |
| LTC695ISW-3.3#TRPBF | SW-16 | I | $5.81 | Yes | ||
| 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.Click here to view our complete list of demo boards
Applications
- 3.3V Low Power Systems
- Critical μP Power Monitoring
- Intelligent Instruments
- Battery-Powered Computers and Controllers
- Automotive Systems
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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
Models for the following parts are available in LTspice:
LTC695
LTC695-3.3
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.
