This part is a kind of semiconductor called 6355ED.

Function of this product has NJU6355ED.

Manufacturers : New Japan Radio

Image and pinout :

Some of the text within the PDF file :

NJU6355 SERIAL I/O REAL TIME CLOCK sGENERAL DESCRIPTION The NJU6355 series is a serial I/O real time clock suitable for 4 bits microprocessor. It contains quartz crystal oscillator, counter, shift register, voltage regulator, voltage detector and interface controller. The NJU6355 series required only 4-port of microprocessor for data transfer, and the microprocessor can receive the data at any time when the microprocessor requires. The operating voltage is as wide as 2.0V to 5.5V, consequently, the NJU6355 series can count accurate time data even if the back up period. Furthermore, the long time back up is available as the operating current during the back up period is less than 3uA(TYP). sFEATURES qLow Operating Voltage qLow Operating Current sPACKAGE OUTLINE NJU6355 [ ... ]

6355ED PDF Datasheet Download