1. Overview

️· What it is: The AM93LC86 is a serial EEPROM (Electrically Erasable Programmable Memory). EEPROMs allow data to be electrically erased and reprogrammed, making them useful for storing configuration data, firmware, or other persistent information. The “Serial” designation means data is accessed bit-by-bit using a serial communication protocol.
️· Memory Size: The document doesn't explicitly state the size, but it implies 16K bits (16384 bits).
️· Key Features:
- Serial Interface: Simple connection, requires fewer pins.
- EEPROM: Non-volatile memory – retains data even when power is removed.
- Write Protection: Allows for disabling of writing to the memory.
- Organization Selection: The ORG pin selects between X8 and X16 memory organization.

2. Pinout and Functions

Pin	Function	Description
1	DI (Data Input)	Serial data input; also used for opcode, address, and data during programming.
2	DO (Data Output)	Serial data output during read operations.
3	WP (Write Protect)	Enables or disables write operations. Floated or tied to VCC allows writing; tied to GND inhibits writing.
4	ORG (Organization)	Selects memory organization: VCC = X16, GND = X8.
5	VSS	Ground.
6	VCC	Power Supply.
7	NC (No Connect)	Not Connected

3. Operating Modes and Instructions (Key Points)

️· Serial Communication: Data is transferred serially, one bit at a time.
️· Start Condition: Required to initiate a command sequence. (Details of the specific start sequence aren’t fully described here, but it involves a specific pattern of signals on DI).
️· Instruction Sequence: The device expects a sequence of bits representing the instruction (opcode) followed by address and then data.
️· Self-Timed Write Cycles: The device has a “self-timed” write cycle. This means that the microcontroller doesn’t need to actively control the timing of the write process. The EEPROM handles the timing internally.