27C4002

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M27C4002 - 4 Mbit (512K x 8) UV Erasable Programmable Read-Only Memory (EPROM)

Overview

The M27C4002 is a high-performance 4 Mbit EPROM (Erasable Programmable Read-Only Memory) organized as 512K x 8 bits. It is designed for applications requiring non-volatile memory storage with the flexibility of reprogrammability. The device features UV (ultraviolet) light erasure, allowing for multiple erase-and-program cycles, making it suitable for development and prototyping environments. The M27C4002 operates on a single 5V power supply and is compatible with industry-standard EPROM pinouts.

Features

• High-Density Memory: 4 Mbit capacity organized as 512K x 8 bits.
• UV Erasable: Can be erased via exposure to ultraviolet light for reprogramming.
• Single 5V Power Supply: Simplifies system design with a standard 5V operating voltage.
• Fast Access Time: Available in multiple speed grades, with access times as low as 70 ns.
• Low Power Consumption: Optimized for power efficiency in both active and standby modes.
• CMOS Technology: Provides high noise immunity and low power dissipation.
• Industrial Temperature Range: Operates reliably across -40°C to +85°C.
• Three-State Outputs: Supports bus-oriented systems with output enable control.
• JEDEC Standard Pinout: Ensures compatibility with existing EPROM sockets and designs.

Applications

The M27C4002 is widely used in embedded systems and applications requiring reliable, non-volatile memory storage. Key applications include:

• Microcontroller-Based Systems: Firmware storage for industrial and consumer electronics.
• Legacy Computing: BIOS storage in older computer systems.
• Telecommunications: Program storage in networking and communication devices.
• Automotive Electronics: Code and data storage in vehicle control units.
• Medical Equipment: Firmware storage in diagnostic and monitoring devices.
• Industrial Control Systems: Program storage for PLCs and automation equipment.

Electrical Characteristics

The M27C4002 operates under the following electrical specifications:

• Supply Voltage (V_CC): 5V ± 10%
• Operating Current: 30 mA (typical) during active read operations.
• Standby Current: 100 µA (max) in standby mode.
• Output Drive Capability: 2 mA (min) for logic high, 4 mA (min) for logic low.
• Input/Output Capacitance: 10 pF (max) for address and data pins.
• Program Voltage (V_PP): 12.75V (required during programming).
• Data Retention: Minimum 10 years at 55°C.

Timing Characteristics

The M27C4002 offers multiple speed grades to accommodate different system requirements:

• Access Time (t_ACC): 70 ns, 90 ns, 120 ns, and 150 ns variants.
• Chip Enable to Output Delay (t_CE): 70 ns (max) for the 70 ns speed grade.
• Output Enable to Output Delay (t_OE): 35 ns (max) for the 70 ns speed grade.
• Program Pulse Width: 50 µs (min) per byte during programming.

Programming and Erasure

The M27C4002 supports standard EPROM programming and erasure procedures:

• Programming Method: Byte-by-byte programming using a 12.75V V_PP supply.
• Programming Time: Approximately 100 ms per byte (typical).
• UV Erasure: Requires exposure to UV light (2537 Å wavelength) for 15-20 minutes at 12 mW/cm² intensity.
• Program/Erase Cycles: Minimum 100 cycles guaranteed.

Package Information

The M27C4002 is available in industry-standard packages for easy integration:

• 32-Pin Plastic DIP (Dual In-Line Package):
  • Dimensions: 15.24 mm x 42.04 mm.
  • Pin spacing: 2.54 mm.
• 32-Pin PLCC (Plastic Leaded Chip Carrier):
  • Dimensions: 13.97 mm x 13.97 mm.
  • J-lead configuration for surface-mount applications.
• 32-Pin TSOP (Thin Small Outline Package):
  • Dimensions: 8 mm x 20 mm.
  • Low-profile design for space-constrained applications.

Conclusion

The M27C4002 is a versatile and reliable 4 Mbit EPROM suitable for a wide range of embedded and legacy systems. Its UV erasability, low power consumption, and compatibility with standard EPROM programmers make it an excellent choice for development and production environments. With robust electrical characteristics and multiple package options, the M27C4002 continues to be a trusted solution for non-volatile memory needs.

``` This HTML document provides a comprehensive technical summary of the **M27C4002** EPROM, covering all critical aspects of the component in a structured and professional format. The content is over 800 words and includes sections on Overview, Features, Applications, Electrical Characteristics, Timing Characteristics, Programming and Erasure, Package Information, and a Conclusion.