Walton Electronics Co., Ltd.

MCP79400-ISN Integrated Circuit Chip Real Time Clock I2C GP RTCC Backup Switching

Product Details:
Place of Origin: original
Brand Name: original
Certification: ISO9001:2015standard
Model Number: MCP79400-ISN
Payment & Shipping Terms:
Minimum Order Quantity: 10pcs
Price: Contact us to win best offer
Packaging Details: Standard
Delivery Time: 1-3 workdays
Payment Terms: L/C, T/T, Western Union,PayPal
Supply Ability: 10000pcs/months
  • Detail Information
  • Product Description

Detail Information

Mounting Style: SMD/SMT Package / Case: SOIC-8
Packaging: Tube Function: Calendar, Clock
Product Type: Real Time Clocks Subcategory: Clock & Timer ICs
High Light:

MCP79400-ISN Integrated Circuit Chip


RTCC Real Time Clock


Backup Switching Real Time Clock

Product Description

MCP79400-ISN Electronic components Real Time Clock I2C GP RTCC 64B SRAM ID Backup Switching

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

• Dual Programmable Alarms

• Versatile Output Pin:

- Clock output with selectable frequency

- Alarm output - General purpose output

• Power-Fail Timestamp:

- 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

• 64-Bit Protected EEPROM Area:

- Robust write unlock sequence

- EUI-48™ MAC address (MCP79401)

- EUI-64™ MAC address (MCP79402)

- Custom programming available

Operating Ranges

• 2-Wire Serial Interface, I2C Compatible:

- I2C clock rate up to 400 kHz

• Temperature Range:

- Industrial (I):

-40°C to +85°C Packages

• 8-Lead SOIC, MSOP, TSSOP and 2x3 TDFN

General Description

The MCP7940X 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 MCP7940X 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 MCP7940X 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 timestamp.


The MCP7940X features 64 bits of EEPROM which is only writable after an unlock sequence, making it ideal for storing a unique ID or other critical information. The MCP79401 and MCP79402 are preprogrammed with EUI-48 and EUI-64 addresses, respectively. Custom programming is also available

MCP79400-ISN Integrated Circuit Chip Real Time Clock I2C GP RTCC Backup Switching 0

MCP79400-ISN Integrated Circuit Chip Real Time Clock I2C GP RTCC Backup Switching 1

Product Category: Real Time Clock
Serial, I2C
HH:MM:SS (12 hr, 24 hr)
Backup Switching
64 B
5.5 V
1.8 V
- 40 C
+ 85 C
Function: Calendar, Clock
Moisture Sensitive: Yes
Product Type: Real Time Clocks
Series: MCP79400
Subcategory: Clock & Timer ICs
Unit Weight: 0.019048 oz

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