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X24645 65,536-Bit Serial E²PROM

Overview

The X24645 is a CMOS 65,536-bit serial Electrically Erasable Programmable Read-Only Memory (E²PROM), internally organized as 8192 x 8 bits. This device features a serial interface and a sophisticated software protocol that enables operation across a wide voltage range while maintaining low power consumption. Designed for reliability and flexibility, the X24645 includes advanced protection mechanisms to safeguard stored data against unintended writes or erasures.

Features

Wide Voltage Range: Operates from 2.7V to 5.5V, making it suitable for both 3V and 5V systems.
Low Power Consumption:
- Active Read Current: Less than 1mA
- Active Write Current: Less than 3mA
- Standby Current: Less than 1µA
Memory Organization: Internally organized as 8192 x 8 bits for efficient data storage and retrieval.
Advanced Protection Features:
- Software Write Protection: Prevents accidental writes through software control.
- Programmable Hardware Write Protect: Allows hardware-based protection of memory blocks.
- Block Lock Protection: Configurable protection for 0%, 25%, 50%, or 100% of the memory array.
High Reliability: Endurance of 1,000,000 write cycles per byte and data retention of 100 years.
Serial Interface: Simple 3-wire SPI-compatible interface for easy integration into various systems.

Applications

The X24645 is designed for a wide range of applications where non-volatile memory storage with high reliability and low power consumption is required. Typical applications include:

Industrial Control Systems: Parameter storage and configuration data in automation equipment.
Consumer Electronics: Storage of user settings and calibration data in audio/video equipment.
Automotive Systems: Non-volatile storage for critical parameters in engine control units and infotainment systems.
Medical Devices: Secure storage of device settings and patient data in portable medical equipment.
Smart Meters: Energy consumption data logging in utility metering applications.
IoT Devices: Configuration storage and data logging in wireless sensor nodes.

Electrical Characteristics

Absolute Maximum Ratings

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

DC Characteristics (V_CC = 2.7V to 5.5V, T_A = -40°C to +85°C)

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

AC Characteristics

Clock Frequency: 3MHz (max) at 5V
Clock Frequency: 1MHz (max) at 2.7V
Write Cycle Time: 5ms (typical)
Data Retention: 100 years
Endurance: 1,000,000 write cycles per byte

Package Information

The X24645 is available in multiple package options to suit different application requirements:

8-lead SOIC (208 mil): Small Outline Integrated Circuit package for space-constrained applications.
8-lead PDIP (300 mil): Plastic Dual In-line Package for prototyping and through-hole mounting.
8-lead TSSOP: Thin Shrink Small Outline Package for high-density PCB layouts.

Pin Configuration

Pin 1 (CS): Chip Select (Active Low)
Pin 2 (SO): Serial Data Output
Pin 3 (WP): Write Protect (Active Low)
Pin 4 (VSS): Ground
Pin 5 (SI): Serial Data Input
Pin 6 (SCK): Serial Clock Input
Pin 7 (HOLD): Hold Input (Active Low)
Pin 8 (VCC): Power Supply

Functional Description

The X24645 operates through a simple 3-wire serial interface consisting of Chip Select (CS), Serial Clock (SCK), and Serial Data Input/Output (SI/SO) lines. The device supports both byte write and page write operations, with the page size being 32 bytes. The built-in write protection features can be configured through both hardware (WP pin) and software commands, providing flexible protection schemes for different application requirements.

The memory array is divided into blocks that can be individually protected against writes. The block lock protection can be configured to protect none, one quarter, one half, or the entire memory array. This granular protection scheme allows for secure storage of critical parameters while maintaining the flexibility to update other sections of memory as needed.