Single-wire EEPROM for pin-constrained designs
The Microchip 11LC080-I/P is an 8Kbit serial EEPROM that communicates over a single-wire interface, reducing the I/O pin requirement to one data line plus power and ground. Organized as 1K x 8 bits, it operates at a clock frequency of 100 kHz and supports a wide supply range from 2.5V to 5.5V, making it suitable for mixed-voltage systems without level translation. The through-hole 8-DIP package (0.300" width, 7.62mm pitch) is a standard footprint for prototyping and legacy board designs. Typical applications include storing calibration constants, device configuration parameters, and small lookup tables in industrial controls, instrumentation, and consumer electronics where board space is at a premium but a single-wire bus saves a port pin.
Single-wire vs. I²C — the interface trade-off
The 11LC080-I/P uses Microchip's UNI/O single-wire protocol, which requires only one data line plus VDD and VSS. This contrasts with the AT24C08D-PUM, an 8Kbit I²C EEPROM that needs two bus lines (SCL and SDA) plus pull-up resistors. The single-wire interface saves one GPIO on the host microcontroller and simplifies board routing, but the 100 kHz clock of the 11LC080 is slower than the 1 MHz I²C of the AT24C08D-PUM. For applications where speed is secondary to pin count — such as storing a few bytes of configuration data read once at boot — the single-wire trade-off is favorable.
The ROHS3 compliance covers the majority of global regulatory requirements for new designs.
Housed in an 8-DIP (0.300", 7.62mm) through-hole package with a supplier device package of 8-PDIP, the 11LC080-I/P is suited for socketed prototyping, breadboard testing, or designs where vibration resistance is less critical than ease of replacement. The write cycle time of 5 ms per word or page is typical for serial EEPROMs in this density class.