X24321 Technical Summary

X24321 CMOS Serial E²PROM Memory

Overview

The X24321 is a CMOS Serial Electrically Erasable Programmable Read-Only Memory (E²PROM) designed for low-power, high-reliability applications. This memory component offers non-volatile data storage with a 2-wire serial interface, making it suitable for a wide range of embedded systems and consumer electronics. With its flexible power supply options and robust feature set, the X24321 provides an efficient solution for applications requiring reliable data retention and frequent read/write operations.

Features

Wide Operating Voltage Range:
- 1.8V to 3.6V
- 2.5V to 5.5V
- 4.5V to 5.5V
Low Power Consumption:
- Active Read Current: Less than 1mA
- Active Write Current: Less than 3mA
- Standby Current: Less than 1µA
High-Speed 2-Wire Serial Interface:
- 400KHz Fast Mode operation
- Supports voltages down to 1.8V
- Schmitt Trigger inputs for noise suppression
- Output slope control to eliminate ground bounce noise
Memory Organization:
- Internally organized as 4K x 8-bit (4096 bytes)
Efficient Write Operations:
- 32-byte page write mode minimizes total write time per byte
- Self-timed write cycle with typical duration of 5ms
Data Protection:
- Hardware write protect feature
- Bidirectional data transfer protocol
High Reliability:
- Endurance: 1,000,000 write cycles
- Data retention: 100 years

Applications

The X24321 is suitable for a wide range of applications requiring non-volatile memory storage with low power consumption and high reliability:

Consumer electronics (smartphones, tablets, digital cameras)
Industrial control systems
Automotive electronics
Medical devices
Network equipment
Embedded systems
Smart meters
IoT devices
Set-top boxes
Gaming consoles

Electrical Characteristics

Absolute Maximum Ratings

Supply Voltage (VCC): -0.3V to +6.5V
Input Voltage (VIN): -0.3V to VCC + 0.3V
Operating Temperature Range: -40°C to +85°C
Storage Temperature Range: -65°C to +150°C

DC Characteristics

Supply Current (Read): 1mA max (VCC = 5.5V)
Supply Current (Write): 3mA max (VCC = 5.5V)
Standby Current: 1µA max (VCC = 5.5V)
Input Leakage Current: ±1µA max
Output Leakage Current: ±1µA max

AC Characteristics

Clock Frequency: 400kHz max
Clock Low Time: 1.3µs min
Clock High Time: 0.6µs min
Start Condition Hold Time: 0.6µs min
Data In Hold Time: 0µs min
Data In Setup Time: 100ns min
Write Cycle Time: 5ms typical

Package Information

The X24321 is available in an 8-lead SOIC (Small Outline Integrated Circuit) package with the following dimensions:

Package Type: SOIC-8
Package Width: 3.9mm (nominal)
Package Length: 4.9mm (nominal)
Lead Pitch: 1.27mm
Lead Width: 0.51mm (nominal)
Lead Length: 1.27mm (nominal)
Package Height: 1.75mm (max)

Pin Configuration

Pin 1: A0 - Chip Address Input
Pin 2: A1 - Chip Address Input
Pin 3: A2 - Chip Address Input
Pin 4: VSS - Ground
Pin 5: SDA - Serial Data
Pin 6: SCL - Serial Clock
Pin 7: WP - Write Protect
Pin 8: VCC - Power Supply

Functional Description

The X24321 operates as a slave device on the 2-wire serial bus, supporting the standard I²C protocol. Communication is initiated by a start condition from the master device, followed by a device address byte. The device features a 32-byte page write buffer that allows for efficient programming of multiple bytes in a single operation, significantly reducing total write time.

The write protect (WP) pin provides hardware protection against accidental writes when pulled high. When WP is high, the entire memory array is protected from write operations. The device also includes internal timing and control circuitry for the write cycle, eliminating the need for external components.