24LC256 (PDIP/SOIC)
Price
$2.90
This 24LC256 is a 32K x 8 (256 Kbit), I2C Erasable PROM, and operate at voltage range (2.5V to 5.5V).
4x3 Keypad is used to allow user to key in decimal number (0-9), * and # keys.
Features:
Dimension:

Photos (with iBoard):
Tutorial: