M27V405 - 4 Mbit (512K x 8) Low-Voltage EPROM

Overview

The M27V405 is a 4 Mbit Electrically Programmable Read-Only Memory (EPROM) designed for low-voltage applications. Organized as 512K x 8 bits, this component provides reliable non-volatile storage for embedded systems, industrial controls, and other applications requiring firmware or data retention. The M27V405 operates at a low voltage, making it suitable for power-sensitive designs while maintaining high performance and endurance.

Key Features

• Memory Capacity: 4 Mbit (512K x 8 organization)
• Low-Voltage Operation: Supports a wide voltage range for power efficiency
• High-Speed Access Time: Fast read operations for improved system performance
• Single Supply Voltage: Simplified power supply design
• CMOS Technology: Low power consumption and high noise immunity
• Industrial Temperature Range: Operates reliably in harsh environments (-40°C to +85°C)
• Standard EPROM Interface: Easy integration with existing systems
• Programmable via Standard EPROM Programmers: Compatible with industry-standard tools
• Data Retention: Guaranteed retention for 10 years or more

Applications

The M27V405 is widely used in applications requiring non-volatile memory storage, including:

• Embedded Systems: Firmware storage for microcontrollers and processors
• Industrial Automation: Program storage for PLCs and control systems
• Automotive Electronics: Code and parameter storage in ECUs and infotainment systems
• Consumer Electronics: BIOS storage in computers and gaming consoles
• Medical Devices: Reliable data storage in diagnostic and monitoring equipment
• Telecommunications: Firmware for networking and communication devices

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 (max) at V_CC = 3.6V
• Active Read Current (I_CC): 15 mA (max) at V_CC = 3.6V
• Output High Voltage (V_OH): 2.4V (min) at I_OH = -2.0 mA
• Output Low Voltage (V_OL): 0.4V (max) at I_OL = 2.0 mA

AC Characteristics

• Address Access Time (t_ACC): 70 ns (max)
• Chip Enable Access Time (t_CE): 70 ns (max)
• Output Enable Access Time (t_OE): 35 ns (max)
• Read Cycle Time (t_RC): 70 ns (min)

Package Information

The M27V405 is available in multiple industry-standard packages, ensuring compatibility with various PCB designs and assembly processes.

Available Packages

• 32-Lead Plastic DIP (PDIP):
  • Package Dimensions: 15.24mm x 6.35mm
  • Pin Pitch: 2.54mm
  • RoHS Compliant
• 32-Lead PLCC (Plastic Leaded Chip Carrier):
  • Package Dimensions: 13.97mm x 13.97mm
  • Pin Pitch: 1.27mm
  • Surface Mount Compatible
• 32-Lead TSOP (Thin Small Outline Package):
  • Package Dimensions: 20mm x 8mm
  • Pin Pitch: 0.8mm
  • Low-Profile Design for Space-Constrained Applications

Pin Configuration

The M27V405 features a standard 32-pin configuration with the following key pins:

• A0-A18: Address Inputs (19 address lines for 512K addressing)
• DQ0-DQ7: Data Inputs/Outputs (8-bit data bus)
• CE: Chip Enable (Active LOW)
• OE: Output Enable (Active LOW)
• PGM: Program Pulse Input (During programming)
• V_PP: Programming Voltage Input
• V_CC: Power Supply (3.0V to 3.6V)
• GND: Ground

Programming and Erasure

The M27V405 supports standard EPROM programming methods, including:

• Programming Voltage (V_PP): 12.5V (typical)
• Programming Algorithm: Byte-by-byte programming with verification
• Erasure Method: UV light exposure (wavelength 2537 Å, minimum exposure 15 W-sec/cm²)
• Programming Time: Typically 100 µs per byte

Reliability and Quality

The M27V405 is designed for high reliability and meets stringent quality standards, including:

• Endurance: Minimum 100 programming cycles
• Data Retention: 10 years minimum at 85°C
• ESD Protection: Human Body Model (HBM) ≥