M27C202 2 Mbit EPROM Technical Summary

Overview

The M27C202 is a high-performance 2 Mbit (256K x 8) Erasable Programmable Read-Only Memory (EPROM) device designed for applications requiring non-volatile memory storage. This component features fast access times, low power consumption, and reliable data retention, making it suitable for a wide range of industrial, automotive, and embedded systems. The M27C202 is housed in a standard 32-pin DIP (Dual In-line Package) or PLCC (Plastic Leaded Chip Carrier) package, ensuring compatibility with existing designs and ease of integration.

Key Features

• Memory Capacity: 2 Mbit (256K x 8 organization)
• Fast Access Time: Ranges from 120ns to 200ns, depending on the variant
• Low Power Consumption: Active current of 30mA (typical), standby current of 100μA (max)
• Single 5V Power Supply: Simplifies system design and power management
• High Reliability: Endurance of 100,000 program/erase cycles and data retention of 10 years
• UV Erasable: Windowed package allows for ultraviolet light erasure
• CMOS Technology: Provides low power and high noise immunity
• Tri-State Outputs: Allows for easy bus sharing in multi-device systems

Applications

The M27C202 is widely used in applications requiring non-volatile firmware or data storage, including:

• Embedded Systems: Firmware storage for microcontrollers and DSPs
• Industrial Control: Program storage for PLCs and automation equipment
• Automotive Electronics: Engine control units (ECUs) and infotainment systems
• Medical Devices: Storing calibration data and operational firmware
• Legacy Systems: Upgrades and replacements for older EPROM-based designs
• Telecommunications: Boot code and configuration storage in networking hardware

Electrical Characteristics

Absolute Maximum Ratings

• Supply Voltage (Vcc): -0.6V to +7.0V
• Input Voltage: -0.6V to Vcc + 0.6V
• Output Voltage: -0.6V to Vcc + 0.6V
• Operating Temperature Range: -40°C to +85°C (industrial grade)
• Storage Temperature Range: -65°C to +150°C

DC Characteristics

• Input High Voltage (Vih): 2.0V min (Vcc = 5V ±10%)
• Input Low Voltage (Vil): 0.8V max (Vcc = 5V ±10%)
• Output High Voltage (Voh): 2.4V min (Ioh = -2.0mA)
• Output Low Voltage (Vol): 0.45V max (Iol = 2.1mA)
• Supply Current (Active): 30mA typical, 50mA max
• Supply Current (Standby): 100μA max

AC Characteristics

• Address Access Time (Taa): 120ns, 150ns, or 200ns (depending on speed grade)
• Chip Enable Access Time (Tace): 120ns, 150ns, or 200ns
• Output Enable Access Time (Toe): 50ns max
• Read Cycle Time (Tcyc): 120ns, 150ns, or 200ns
• Write Pulse Width (Twpw): 100ms min (for programming)

Package Information

The M27C202 is available in multiple package options to accommodate different design requirements:

32-Pin DIP (Dual In-line Package)

• Package Type: Ceramic or Plastic DIP with UV window
• Dimensions: 42.67mm x 13.97mm (including leads)
• Pin Pitch: 2.54mm (100 mil)
• Lead Material: Tin-plated or gold-plated

32-Pin PLCC (Plastic Leaded Chip Carrier)

• Package Type: Plastic J-lead chip carrier
• Dimensions: 13.97mm x 13.97mm (body)
• Pin Pitch: 1.27mm (50 mil)
• Lead Count: 32 (J-lead configuration)

Programming and Erasure

The M27C202 supports standard EPROM programming and erasure procedures:

Programming

• Requires a 12.75V programming voltage (Vpp)
• Uses a 50ms pulse width per address location
• Programming verification is performed after each pulse
• Total programming time is approximately 5 minutes for full device

Erasure

• UV erasure requires exposure to 253.7nm wavelength light
• Minimum erasure dose of 15W-sec/cm²
• Typical erasure time of 15-20 minutes under UV lamp
• All bits return to logic '1' state after complete erasure

Ordering Information

The M27C202 is available in various speed grades and package options:

• M27C202-12: 120ns access time
• M27C202-15: 150ns access time
• M27C202-20: 200ns access time
• Package Suffixes: DIP (P), PLCC (L), Windowed (W)

Quality and Reliability

The M27C202 meets stringent quality and reliability standards:

• 100% tested for functionality and performance
• Burn-in available for high-reliability applications
• ESD protection exceeds 2000V (Human Body Model)
• Manufactured in ISO 9001 certified facilities

Conclusion

The M27C202 2 Mbit EPROM provides a reliable, high-performance non-volatile memory solution for a wide range of applications. With its combination of fast access times, low power consumption, and proven reliability, it remains a preferred choice for systems requiring UV-erasable program storage. The availability in multiple package options and speed grades ensures designers can select the optimal configuration for their specific requirements.