MCP7940N-E/SN

$0.78

Description：IC RTC CLK/CALENDAR I2C 8SOIC
Series：-

SKU:7e1bc3cf87fb Category: Real Time Clocks Brand: Microchip Technology

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Product introduction

MCP7940N-E/SN is listed in the Real Time Clock range at ChipApex. The manufacturer field lists Microchip Technology. Its product description is IC RTC CLK/CALENDAR I2C 8SOIC. Review the specifications below when checking this part for your BOM.

Real Time Clock specifications for MCP7940N-E/SN

Description：IC RTC CLK/CALENDAR I2C 8SOIC
Series：-
Package：Tube
Mfr：Microchip Technology
Type：Clock/Calendar
Features：Alarm, Leap Year, Square Wave Output, SRAM
Memory Size：64B
Time Format：HH:MM:SS (12/24 hr)
Date Format：YY-MM-DD-dd
Interface：I2C, 2-Wire Serial
Voltage - Supply：1.8V ~ 5.5V
Voltage - Supply, Battery：1.3V ~ 5.5V
Current - Timekeeping (Max)：1.2µA @ 3.3V
Operating Temperature：-40°C ~ 125°C
Mounting Type：Surface Mount
Grade：Automotive
Qualification：AEC-Q100
Package / Case：8-SOIC (0.154", 3.90mm Width)
Supplier Device Package：8-SOIC

Real Time Clock datasheet and documents for MCP7940N-E/SN

MCP7940N-E/SN

Real Time Clock Overview

The MCP7940N-E/SN is a battery-backed I2C Real-Time Clock/Calendar (RTCC) with 64-byte SRAM, manufactured by Microchip Technology. It tracks time using internal counters for hours, minutes, seconds, day of week, date, month, and year, supporting both 12-hour and 24-hour modes with leap year compensation through 2399. The device operates on a primary supply of 1.8V to 5.5V and a backup supply of 1.3V to 5.5V. Typical timekeeping current is 1.2 µA at 3.3V from VCC and 925 nA at 3.0V from the battery. It features dual programmable alarms, an open-drain multifunction pin, and on-chip digital trimming with ±1 PPM resolution.

Real Time Clock Feature Summary

Real-Time Clock/Calendar with 64-byte battery-backed SRAM
I2C interface supporting clock rates up to 400 kHz
On-chip digital trimming for oscillator calibration (±129 PPM range)
Dual programmable alarms and versatile multifunction output pin

Real Time Clock Applications

Industrial systems requiring precise timekeeping in extended temperature ranges
Automotive electronics certified under AEC-Q100 standards
Battery-powered devices utilizing automatic switchover to backup supply

Real Time Clock Procurement Notes

Verify that the ordering suffix 'SN' corresponds to the 8-lead SOIC package as specified in the datasheet. Confirm the 'E' suffix indicates the Extended temperature range (-40°C to +125°C). Ensure compatibility with the host system's I2C voltage levels and pull-up resistor requirements for reliable communication.

Real Time Clock Selection Notes

Select the MCP7940N-E/SN when operation in temperatures up to +125°C is required. The SOIC package is suitable for surface-mount assembly. Consider the MCP7940N-I/SN if the application environment remains within the Industrial temperature range (-40°C to +85°C). Ensure external load capacitors are selected to match the crystal's specified load capacitance of 6-9 pF for optimal frequency accuracy.

Real Time Clock Part Context

The MCP7940N belongs to the MCP7940 family of RTCCs, which also includes variants like the MCP7940M and MCP79411. These devices share similar core functionalities but may differ in package options or specific feature sets. The MCP7940N specifically integrates 64 bytes of SRAM alongside its timekeeping capabilities, distinguishing it from simpler RTC models.