X24640

X24640 Technical Summary

Overview

The X24640 is a CMOS Serial E²PROM (Electrically Erasable Programmable Read-Only Memory) designed for non-volatile data storage in a wide range of applications. Internally organized as 8K x 8 (8,192 words of 8 bits each), this device offers reliable data retention and flexible write protection features. The X24640 operates across multiple voltage ranges, making it suitable for both low-power and standard voltage applications. Its serial interface and compact package options enable easy integration into space-constrained designs.

Key advantages of the X24640 include programmable block lock protection for securing critical data, low power consumption for battery-operated devices, and high endurance with 100,000 write cycles. The device supports a 400kHz 2-wire serial interface with noise suppression features, ensuring reliable communication in electrically noisy environments.

Features

• Advanced Data Protection:
  • Programmable Block Lock Protection (0, 1/4, 1/2, or entire array)
  • Software Program Protection
  • Programmable Hardware Write Protect
• Flexible Operating Modes:
  • In-Circuit Programmable ROM Mode
  • 32-word Page Write Mode minimizes total write time
  • Bidirectional Data Transfer Protocol
• Optimized Interface:
  • 400kHz 2-wire Serial Interface
  • Schmitt Trigger Inputs for noise suppression
  • Output Slope Control to eliminate ground bounce noise
• Power Efficiency:
  • Active Read Current: <1mA
  • Active Program Current: <3mA
  • Standby Current: <1µA
• Voltage Compatibility:
  • 1.8V to 3.6V version
  • 2.5V to 5.5V version
  • 4.5V to 5.5V version
• High Reliability:
  • Endurance: 100,000 write cycles
  • Data Retention: 100 years
  • Self-timed write cycle (typical 5ms)

Applications

The X24640 is suitable for a wide range of applications requiring reliable non-volatile memory storage:

• Industrial Systems:
  • Parameter storage for industrial controllers
  • Calibration data storage
  • Equipment configuration settings
• Consumer Electronics:
  • Smart home device configuration
  • User preference storage
  • Gaming system save data
• Automotive Systems:
  • Vehicle configuration parameters
  • Infotainment system settings
  • Telematics data logging
• Medical Devices:
  • Patient monitoring equipment
  • Device calibration data
  • Usage history logging
• Networking Equipment:
  • Router/switch configuration
  • MAC address storage
  • Firmware update tracking

Electrical Characteristics

Absolute Maximum Ratings

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

DC Characteristics (V_CC = 5V ±10%, T_A = 25°C)

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

AC Characteristics

• Clock Frequency: 400kHz maximum
• Clock Low Time: 1.3µs minimum
• Clock High Time: 0.6µs minimum
• Start Condition Hold Time: 0.6µs minimum
• Data In Hold Time: 0µs minimum
• Write Cycle Time: 5ms typical

Package Information

8-Lead SOIC

• Package Dimensions: 5.00mm x 6.20mm body
• Lead Pitch: 1.27mm
• Height: 1.75mm maximum
• Moisture Sensitivity Level: MSL 3

20-Lead TSSOP

• Package Dimensions: 6.50mm x 4.40mm body
• Lead Pitch: 0.65mm
• Height: 1.20mm maximum
• Moisture Sensitivity Level: MSL 1

8-Lead PDIP

• Package Dimensions: 9.81mm x 6.35mm body
• Lead Pitch: 2.54mm
• Height: 3.30mm maximum
• Moisture Sensitivity Level: MSL 1

Functional Description

The X24640 operates via a simple 2-wire serial interface consisting of a serial clock (SCL) and serial data (SDA) line. The device supports standard I2C protocol with device addressing, allowing multiple devices to share the same bus. Memory operations include byte write, page write (up to 32 bytes), current address read, random read, and sequential read modes.

The write protection features offer multiple levels of security. The hardware write protect pin (WP) when activated prevents any modifications to the memory array. Software protection is implemented through block lock bits that can protect portions of the memory from modification. The device also features a write enable latch that must be set before any write operation can occur.

The self-timed write cycle eliminates the need for external polling or delay loops. During the internal write cycle, the device will not acknowledge commands, simplifying system design. An internal power-on reset circuit ensures proper initialization when power is applied.