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Product Description

The MCP7940N Real-Time Clock/Calendar (RTCC) tracks time using internal counters for hours, minutes, seconds, days, months, years, and day 

of week. Alarms can be configured on all counters up to and including months. For usage and configuration, the MCP7940N supports I2C 

communications up to 400 kHz.

The open-drain, multi-functional output can be configured to assert on an alarm match, to output a selectable frequency square wave, or as a 

general purpose output. The MCP7940N is designed to operate using a 32.768 kHz tuning fork crystal with external crystal load capacitors. On-

chip digital trimming can be used to adjust for frequency variance caused by crystal tolerance and temperature. 

SRAM and timekeeping circuitry are powered from the back-up supply when main power is lost, allowing the device to maintain accurate time 

and the SRAM contents. The times when the device switches over to the back-up supply and when primary power returns are both logged by 

the power-fail time-stamp.

Product Features

Timekeeping Features

? Real-Time Clock/Calendar (RTCC):

- Hours, Minutes, Seconds, Day of Week, Day, Month, Year

- Leap year compensated to 2399

- 12/24 hour modes

? Oscillator for 32.768 kHz Crystals:

- Optimized for 6-9 pF crystals

? On-Chip Digital Trimming/Calibration:

- ±1 PPM resolution

- ±129 PPM range

? Dual Programmable Alarms

? Versatile Output Pin:

- Clock output with selectable frequency

- Alarm output

- General purpose output

? Power-Fail Time-Stamp:

- Time logged on switchover to and from Battery mode

Low-Power Features

? Wide Voltage Range:

- Operating voltage range of 1.8V to 5.5V

- Backup voltage range of 1.3V to 5.5V

? Low Typical Timekeeping Current:

- Operating from VCC: 1.2 μA at 3.3V

- Operating from battery backup: 925 nA at 3.0V

? Automatic Switchover to Battery Backup 

User Memory

? 64-byte Battery-Backed SRAM

Operating Ranges

? Two-Wire Serial Interface, I2C Compatible

- I2C clock rate up to 400 kHz

? Temperature Range:

- Industrial (I): -40°C to +85°C

- Extended (E): -40°C to +125°C

? Automotive AEC-Q100 Qualified

Packages

? 8-Lead MSOP, 8-Lead PDIP, 8-Lead SOIC,  8-Lead 2x3 TDFN and 8-Lead TSSOP

Specifications

Actual product photos

Product Data Book：

For more product information, please download the PDF

Payment&Transportation

Official Certificate&Certificate

Multiple product supply

Company office environment

Warehouse Real Shot

Standard packaging

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