MCP7940N-I/SN

The MCP7940N-I/SN is a low-power real-time clock/calendar (RTCC) with battery backup, manufactured by Microchip. It features I²C communication, 64 bytes of SRAM, and built-in timestamp logging for power failures. Key highlights include:
- Battery Backup: Operates from a backup supply (1.3V–5.5V) during main power loss.
- Accuracy: ±2 minutes/year (typical) with crystal oscillator.
- Alarms: Two programmable alarms with interrupt outputs.
- Unique ID: Factory-programmed 64-bit serial number for secure identification.
- Power Efficiency: Ultra-low standby current (~400nA).
Available in an 8-pin SOIC package, it’s ideal for embedded systems, IoT devices, and data logging. The MCP7940N also supports leap-year correction and operates from 1.8V–5.5V (main supply).
For more details, refer to the [Microchip datasheet](https://www.microchip.com).

Equivalent products to the MCP7940N-I/SN (RTC with EEPROM) include:
- DS3231 (Maxim Integrated) - Higher accuracy, no EEPROM.
- PCF8523 (NXP) - Lower power, I²C interface.
- RV-8803-C7 (Micro Crystal) - Ultra-low power, I²C.
- DS1307 (Maxim Integrated) - Basic RTC, no EEPROM.
For drop-in replacements, check Microchip's MCP7940M (industrial grade) or MCP7940T (extended temp). Verify pinout and features for compatibility.

The MCP7940N-I/SN is a low-power real-time clock/calendar (RTCC) with battery backup and I²C interface. Key features:
- Battery Backup: Operates down to 1.3V (VBAT) for timekeeping during power loss.
- I²C Interface: Supports 100kHz (standard) and 400kHz (fast) modes.
- Timekeeping: Tracks seconds, minutes, hours, day, date, month, and year (leap-year compensated).
- Alarms: Two configurable alarms with interrupt output.
- SRAM: 64 bytes of nonvolatile user memory.
- Oscillator: Built-in trimmed 32.768kHz crystal oscillator (±20ppm accuracy).
- Power Management: Ultra-low power consumption (~0.6µA in battery mode).
- Additional Features: Timestamping, power-fail timestamp, and software clock calibration.
- Package: 8-pin SOIC (150mil).
Ideal for embedded systems requiring precise timekeeping with minimal power.

The MCP7940N-I/SN is a versatile real-time clock (RTC) and calendar IC with battery backup, widely used in:
1. Consumer Electronics: Smartwatches, appliances, and digital cameras.
2. Industrial Systems: Automation, data loggers, and energy meters.
3. Networking Equipment: Routers, switches, and servers for time-stamping.
4. Automotive: Infotainment and telematics systems.
5. IoT Devices: Sensors and smart home gadgets requiring timekeeping.
It features I²C interface, SRAM, alarms, and timestamping, making it ideal for applications needing precise time management with low power consumption.

The MCP7940N-I/SN comes in an 8-pin SOIC (150 mil) package. This surface-mount package is compact and widely used for integrated circuits, offering good thermal and electrical performance. The "SN" suffix indicates the SOIC package type. Suitable for automated assembly processes, it’s ideal for space-constrained applications like RTC modules.