Electronics ru
Advanced Search +

Datasheet Microchip MCP7940N-I/P

Part NumberMCP7940N-I/P

The MCP7940N series of low-power Real-Time Clocks (RTC) uses digital timing compensation for an accurate clock/calendar, a programmable output control for versatility, and a power sense circuit that automatically switches to the backup supply


  • Download » Datasheet PDF, 1.4 Mb, File published: Mar 20, 2014
    MCP7940N Low-Cost I2C Real-Time Clock/Calendar with SRAM and Battery Switchover
    Docket ↓
    Battery-Backed I2Cв„ў Real-Time Clock/Calendar with SRAM
    Timekeeping Features: Operating Ranges: 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:
    -В±1 PPM resolution
    -В±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 2-Wire Serial Interface, I2Cв„ў Compatible
    -I2C clock rate up to 400 kHz Temperature Range:
    -Industrial (I): -40В°C to +85В°C
    -Extended (E): -40В°C to +125В°C 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 ВµA at 3.3V
    -Operating from battery backup: 925 nA at
    3.0V Automatic Switchover to Battery Backup User Memory: 64-byte Battery-Backed SRAM Packages: 8-Lead SOIC, MSOP, TSSOP, PDIP and 2x3 ...



Lifecycle StatusProduction (Appropriate for new designs but newer alternatives may exist)




Alarms2 Alarms (1 sec)
Digital_Trimming-127 to +127ppm (1 ppm steps)
Ibat Current700 nA
Operating Temperature Range-40 to +85 °C
Power-Fail TimestampVCC Fail and VCC Restore
Temperature Range-40 to +125
Unique IDNone MAC_Address
User SRAM64 Bytes
Vbat Range1.3 - 5.5 V
Vcc Range1.8 - 5.5 V

Eco Plan


Moldel Line

Series: MCP7940N (13)

Manufacturer's Classification

  • Clock and Timing > Real-Time Clock > RTCC

Other Names:

MCP7940NI/P, MCP7940N I/P

Slices ↓
Radiolocman facebook Radiolocman twitter Radiolocman google plus