M29F002B 2 Mbit (256Kb x8) Non-Volatile Flash Memory

Overview

The M29F002B is a high-performance 2 Mbit non-volatile flash memory device organized as 256Kb x8. Manufactured using advanced CMOS technology, this component offers fast read access times, low power consumption, and high reliability for embedded systems and other applications requiring non-volatile storage. The device features a uniform block architecture with sector erase capability, making it suitable for both code and data storage applications.

With its byte-wide organization and standard microprocessor interface, the M29F002B provides a convenient upgrade path from older EPROM and EEPROM technologies while offering the benefits of in-system reprogrammability. The device operates from a single 5V power supply and incorporates advanced data protection features to prevent accidental corruption of stored information.

Key Features

• 2 Mbit (256Kb x8) flash memory organization
• Single 5V ±10% power supply operation
• Fast access time: 70ns maximum
• Low power consumption:
  • Active current: 30mA typical
  • Standby current: 100μA typical
• Sector erase architecture:
  • Four 16Kb sectors
  • One 32Kb sector
  • Seven 64Kb sectors
• 10,000 minimum erase/program cycles per sector
• 20-year minimum data retention
• Hardware and software data protection
• Compatible with JEDEC standard commands
• Industrial temperature range (-40°C to +85°C)

Applications

The M29F002B is designed for a wide range of applications requiring reliable non-volatile storage, including:

• Embedded system firmware storage
• Industrial control systems
• Automotive electronics
• Telecommunications equipment
• Medical devices
• Consumer electronics
• Set-top boxes
• Network devices
• BIOS storage for PCs and workstations
• Parameter storage in measurement equipment

Electrical Characteristics

Absolute Maximum Ratings

• Supply Voltage (V_CC): -0.3V to +7.0V
• Input Voltage: -0.3V to V_CC + 0.3V
• Output Voltage: -0.3V to V_CC + 0.3V
• Storage Temperature: -65°C to +150°C
• Operating Temperature: -40°C to +85°C

DC Characteristics (T_A = -40°C to +85°C, V_CC = 5V ±10%)

• Supply Current (Read): 30mA maximum
• Supply Current (Program/Erase): 50mA maximum
• Standby Current: 100μA maximum
• Input Leakage Current: ±1μA maximum
• Output Leakage Current: ±1μA maximum
• Input Low Voltage: 0.8V maximum
• Input High Voltage: 2.0V minimum

AC Characteristics

• Read Access Time: 70ns maximum
• Chip Enable Access Time: 70ns maximum
• Output Enable Access Time: 30ns maximum
• Write Pulse Width: 50ns minimum
• Byte Program Time: 20μs typical
• Sector Erase Time: 1s typical
• Chip Erase Time: 15s typical

Functional Description

Memory Architecture

The M29F002B features a uniform sector architecture that provides flexible erase capability. The memory array is divided into twelve physically distinct sectors that can be independently erased. This architecture allows for efficient memory management, enabling the device to store both program code and variable data.

Command Interface

The device uses a standard microprocessor interface with a command set compatible with JEDEC standards. Key operations include:

• Read/Reset: Returns the device to read mode
• Autoselect: Reads manufacturer and device codes
• Byte Program: Programs a single byte
• Sector Erase: Erases a specified sector
• Chip Erase: Erases the entire memory array
• Program/Erase Suspend: Temporarily halts an operation

Data Protection

The M29F002B incorporates multiple protection features:

• Hardware protection via write enable (WE#) and output enable (OE#) pins
• Software data protection (SDP) algorithm
• V_CC power-up/down detection
• Write inhibit during erase/program operations

Package Information

Available Packages

• 32-lead PLCC (Plastic Leaded Chip Carrier)
• 32-lead TSOP (Thin Small Outline Package)
• 32-pin DIP (Dual In-line Package)

PLCC Package Dimensions

• Body Size: 13.97mm x 13.97mm
• Lead Pitch: 1.27mm
• Package Height: 4.06mm maximum
• Lead Count: 32

TSOP Package Dimensions

• Body Size: 20mm x 8mm
• Lead Pitch: 0.8mm
• Package Height: 1.2mm maximum
• Lead Count: 32

Ordering Information

The device is available in different speed grades and package options:

• M29F002BT-70: 70ns access time, TSOP package
• M29F002BN-70: 70ns access time, DIP package
• M29F002BP-70: 70ns access time, PLCC package
• M29F002BT-90: 90ns access time, TSOP package
• M29F002BN-90: 90ns access time, DIP package

Quality and Reliability

The M29F002B meets stringent quality and reliability standards:

• Industrial temperature range operation
• 10,000 minimum program/erase cycles per sector
• 20-year data retention at 85°C
• ESD protection: 2000V minimum on all pins
• Latch-up protection: 100mA maximum

Conclusion

The M29F002B 2 Mbit flash memory provides a reliable, high-performance non-volatile storage solution for a wide range of applications. With its flexible sector architecture, fast access times, and comprehensive data protection features, this device offers an excellent balance of performance and reliability. The availability in multiple package options and speed grades makes it suitable for diverse design requirements across industrial, automotive, and consumer applications.