M27V402 4 Mbit UV EPROM

Overview

The M27V402 is a low-voltage, low-power 4 Mbit Ultraviolet Erasable Programmable Read-Only Memory (UV EPROM) designed for applications requiring non-volatile storage. This component features a high-speed access time and operates at a reduced voltage, making it suitable for power-sensitive embedded systems. The memory is organized as 512K x 8 bits, providing flexible storage for firmware, boot code, or configuration data.

The device supports standard EPROM functionality, including UV erasure for reprogramming, and is compatible with industrial and commercial temperature ranges. Its robust design ensures reliable performance in a variety of environments.

Features

• 4 Mbit Capacity: Organized as 512K x 8 bits for versatile data storage.
• Low Voltage Operation: Supports 3.3V power supply, reducing system power consumption.
• UV Erasable: Allows full erasure via ultraviolet light for reprogramming.
• High-Speed Access Time: Fast read operations with access times as low as 70 ns.
• Low Power Consumption: Ideal for battery-powered or energy-efficient applications.
• Industrial Temperature Range: Operates reliably from -40°C to +85°C.
• Standard EPROM Interface: Easy integration with existing microcontroller and microprocessor systems.
• CMOS Technology: Provides high noise immunity and low standby current.

Applications

The M27V402 is widely used in systems requiring non-volatile memory with the flexibility of reprogramming. Key application areas include:

• Embedded Systems: Firmware storage for microcontrollers and DSPs.
• Industrial Control: Program storage for PLCs and automation equipment.
• Telecommunications: Boot code and configuration storage in networking devices.
• Medical Devices: Reliable code storage for critical healthcare equipment.
• Automotive Electronics: Firmware for engine control units and infotainment systems.
• Legacy Systems: Upgrading or maintaining older EPROM-based designs.

Electrical Characteristics

Absolute Maximum Ratings

• Supply Voltage (V_CC): -0.5V to +7.0V
• Input Voltage (V_IN): -0.5V to V_CC + 0.5V
• Output Voltage (V_OUT): -0.5V to V_CC + 0.5V
• Operating Temperature Range: -40°C to +85°C
• Storage Temperature Range: -65°C to +150°C

Recommended Operating Conditions

• Supply Voltage (V_CC): 3.0V to 3.6V
• Input High Voltage (V_IH): 2.0V to V_CC + 0.3V
• Input Low Voltage (V_IL): -0.3V to 0.8V
• Operating Temperature: -40°C to +85°C

DC Characteristics

• Standby Current (I_SB): ≤ 10 µA (typical)
• Operating Current (I_CC): ≤ 20 mA (at 5 MHz)
• Output High Voltage (V_OH): ≥ 2.4V (I_OH = -2.0 mA)
• Output Low Voltage (V_OL): ≤ 0.4V (I_OL = 2.0 mA)

AC Characteristics

• Address Access Time (t_AA): 70 ns (max)
• Chip Enable Access Time (t_ACE): 70 ns (max)
• Output Enable Access Time (t_OE): 30 ns (max)
• Read Cycle Time (t_RC): 70 ns (min)

Package Information

The M27V402 is available in a standard 32-pin plastic dual in-line package (PDIP) and 32-pin plastic leaded chip carrier (PLCC), providing flexibility for different PCB layouts and assembly processes.

PDIP-32 Package

• Package Dimensions: 15.24 mm x 6.35 mm (body)
• Pin Pitch: 2.54 mm
• Lead Material: Copper alloy
• Lead Finish: Matte tin

PLCC-32 Package

• Package Dimensions: 13.97 mm x 13.97 mm (body)
• Pin Pitch: 1.27 mm
• Lead Material: Copper alloy
• Lead Finish: Matte tin

Handling and Storage

To maintain data integrity and device reliability, follow these guidelines:

• Store in an anti-static container to prevent electrostatic discharge (ESD) damage.
• Avoid exposure to prolonged UV light unless intentional erasure is required.
• Handle by the package body, not the leads, to prevent mechanical stress.

Conclusion

The M27V402 4 Mbit UV EPROM is a versatile and reliable memory solution for applications requiring reprogrammable non-volatile storage. Its low-voltage operation, high-speed performance, and industrial-grade robustness make it suitable for a wide range of embedded and legacy systems. With multiple package options and proven CMOS technology, this component remains a practical choice for designers seeking dependable firmware storage.