X24641 CMOS Serial E²PROM Memory

Overview

The X24641 is a high-performance CMOS Serial Electrically Erasable Programmable Read-Only Memory (E²PROM) designed for applications requiring reliable non-volatile data storage. This device operates across multiple voltage ranges, making it versatile for various system designs. With its 2-wire serial interface, low power consumption, and robust data retention capabilities, the X24641 is ideal for use in industrial, automotive, and consumer electronics applications.

Features

• Wide Voltage Range Operation: Supports 1.8V to 3.6V, 2.5V to 5.5V, and 4.5V to 5.5V power supplies.
• Low Power Consumption:
  • Active Read Current: Less than 1mA
  • Active Write Current: Less than 3mA
  • Standby Current: Less than 1µA
• Fast Mode 2-Wire Serial Interface:
  • Operates at 400KHz
  • Supports down to 1.8V operation
  • Schmitt Trigger inputs for noise suppression
  • Output slope control to eliminate ground bounce noise
• Memory Organization: Internally organized as 8K x 8 (64Kbit).
• 32-Byte Page Write Mode: Minimizes total write time per byte for efficient data storage.
• Hardware Write Protect: Provides additional security against accidental writes.
• Bidirectional Data Transfer Protocol: Enables flexible communication with microcontrollers.
• Self-Timed Write Cycle: Typical write cycle time of 5ms.
• High Reliability:
  • Endurance: 1,000,000 write cycles
  • Data Retention: 100 years

Applications

The X24641 is suitable for a wide range of applications, including but not limited to:

• Industrial automation systems
• Automotive electronics (e.g., ECUs, infotainment systems)
• Consumer electronics (e.g., smart home devices, wearables)
• Medical devices requiring non-volatile memory
• Telecommunications equipment
• Embedded systems with low-power requirements

Electrical Characteristics

Absolute Maximum Ratings

• Voltage on any pin relative to VSS: -0.6V to VCC + 0.6V
• Storage Temperature: -65°C to +150°C
• Operating Temperature: -40°C to +85°C (industrial grade)

DC Characteristics

• Input Low Voltage (VIL): -0.5V to 0.3VCC
• Input High Voltage (VIH): 0.7VCC to VCC + 0.5V
• Output Low Voltage (VOL): 0.4V max (at 3mA sink current)
• Output High Voltage (VOH): VCC - 0.7V min (at 2.1mA source current)

AC Characteristics

• Clock Frequency (SCL): 0 to 400KHz
• Clock Low Period: 1.3µs min
• Clock High Period: 0.6µs min
• Start Condition Hold Time: 0.6µs min
• Data In Hold Time: 0µs min
• Data In Setup Time: 100ns min

Power Consumption

• Active Read Current (ICC): 1mA max at 400KHz
• Active Write Current (ICC): 3mA max
• Standby Current (ISB): 1µA max

Package Information

The X24641 is available in an 8-lead SOIC (Small Outline Integrated Circuit) package with the following dimensions:

• Package Type: SOIC-8
• Package Width: 3.9mm
• Package Length: 4.9mm
• Lead Pitch: 1.27mm
• Lead Count: 8
• RoHS Compliant: Yes

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 X24641 operates using a 2-wire serial interface (I²C compatible) consisting of a Serial Data Line (SDA) and Serial Clock Line (SCL). The device supports bidirectional data transfer between master and slave devices. The memory array is organized as 8,192 words of 8 bits each, with a 32-byte page write buffer that allows for faster write operations.

The Write Protect (WP) pin provides hardware protection against accidental writes when pulled high. When WP is active, the entire memory array becomes read-only. The device features a self-timed write cycle with a typical duration of 5ms, eliminating the need for external timing components.

Ordering Information

The X24641 is available in several variants to accommodate different operating voltage ranges and temperature grades:

• X24641SI-2.5: 2.5V to 5.5V operation, Industrial temperature range (-40°C to +85°C)
• X24641SI-1.8: 1.8V to 3.6V operation, Industrial temperature range
• X24641SI-4.5: 4.5V to 5.5V operation, Industrial temperature range