NXP PCF2127AT/2Y Real-Time Clock (RTC) IC

The PCF2127AT/2Y from NXP Semiconductors is a highly accurate, I²C-bus interface Real-Time Clock (RTC) with an integrated Temperature Compensated Crystal Oscillator (TCXO) and a quartz crystal. This RTC IC is designed for a broad range of applications within consumer electronics, industrial, and computing markets that require a reliable time base with minimal power consumption.

Featuring a wide voltage range of 1.3 V to 5.5 V, the PCF2127AT/2Y is optimized for low power consumption and operates in both battery-powered and battery-backup applications. With a timekeeping current of less than 450 nA, it ensures long battery life and is ideal for systems where power efficiency is crucial.

The device provides a full binary-coded decimal (BCD) clock/calendar function and features automatic leap year correction up to the year 2399. It also includes a programmable clock output for peripheral devices, a programmable timer, and an alarm function that can be set with second, minute, hour, day, weekday, month, and year information.

One of the key benefits of the PCF2127AT/2Y is its integrated oscillator with a frequency accuracy of ±3 ppm from -40°C to +85°C, which translates to a time deviation of less than 2 minutes per year. This high level of accuracy is maintained over the entire temperature range, making it an excellent choice for applications requiring precise timekeeping under varying environmental conditions.

For enhanced security, the PCF2127AT/2Y includes a serial number that can be used for identification purposes. It also features a tamper detection function that can be programmed to detect events and store them in the tamper timestamp register.

Overall, the NXP PCF2127AT/2Y combines high accuracy, low power consumption, and advanced features into a compact package, making it a reliable and versatile choice for designers looking to incorporate an RTC into their systems.