The MK48T02B-25 is a specific integrated circuit (IC) manufactured by STMicroelectronics. It is a 256 Kbit (32 Kbit x 8) Timekeeper® SRAM with a built-in real-time clock (RTC). The “25” in the part number indicates that it operates with a 25 ns access time.

Here are some key features and specifications of the MK48T02B-25:

Memory Capacity: The IC has a total capacity of 256 Kbits, which is organized as 32 Kbits by 8 bits. This means it can store 32,768 bytes of data.

Timekeeper Functionality: The MK48T02B-25 integrates a real-time clock (RTC) circuitry. It includes counters for seconds, minutes, hours, days, months, years, and a 24-hour format flag. The RTC can maintain accurate time and date information even when the power supply to the IC is turned off or interrupted.

Non-Volatile Operation: The IC is non-volatile, which means it can retain the stored data, including the time and date information, without requiring a continuous power supply. It achieves this by utilizing an onboard lithium energy source.

Low Power Consumption: The MK48T02B-25 is designed to operate with low power consumption, making it suitable for battery-powered devices or applications where power efficiency is important.

Access Time: The access time of the IC is specified as 25 ns. This indicates the time required to read or write data from/to the memory.

Package Type: The MK48T02B-25 is available in various package types, such as 28-pin DIP (Dual Inline Package) or surface-mount SOIC (Small Outline Integrated Circuit) packages.