M27C2001 2 Mbit EPROM

Overview

The M27C2001 is a high-speed 2 Mbit (256K x 8) EPROM available in two variants: UV (ultraviolet erase) and OTP (one-time programmable). This component is designed for applications requiring non-volatile memory with fast access times and reliable data retention. The M27C2001 is manufactured using advanced CMOS technology, ensuring low power consumption while maintaining high performance.

The UV-erase variant allows for multiple reprogramming cycles, making it suitable for development and prototyping, while the OTP version is ideal for production environments where data integrity is critical. The device operates over a wide voltage range and is compatible with standard microprocessor systems.

Features

• High-Speed Performance: Access times as fast as 45 ns, suitable for high-performance systems.
• Low Power Consumption: CMOS technology ensures efficient power usage, with active current as low as 30 mA and standby current of 100 µA.
• Dual Variants: Available in UV-erasable (reprogrammable) and OTP (one-time programmable) versions.
• Wide Voltage Range: Operates at 5V ± 10%, compatible with TTL levels.
• High Reliability: Endurance of 100,000 erase/program cycles (UV version) and 10-year data retention.
• Standard Pinout: Compatible with industry-standard EPROMs for easy integration.
• Three-State Outputs: Supports bus-oriented systems with output enable and chip select functionality.

Applications

The M27C2001 is widely used in embedded systems and applications requiring non-volatile memory storage. Key applications include:

• Microcontroller-Based Systems: Firmware storage for industrial and consumer electronics.
• Automotive Electronics: Engine control units (ECUs) and infotainment systems.
• Medical Devices: Program storage for diagnostic and monitoring equipment.
• Telecommunications: Code storage in networking hardware and routers.
• Legacy Systems: Upgrades or replacements for older EPROM-based designs.

Electrical Characteristics

Absolute Maximum Ratings

• Supply Voltage (V_CC): -0.5V to +7V
• 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 (industrial grade)
• Storage Temperature Range: -65°C to +150°C

DC Characteristics

• Supply Current (Active): 30 mA max at 5V, 45 ns access time
• Supply Current (Standby): 100 µA max
• Input Leakage Current: ±1 µA max
• Output Leakage Current: ±1 µA max
• 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

• Access Time (t_ACC): 45 ns, 55 ns, 70 ns, 90 ns, 120 ns (speed grades)
• Chip Enable to Output Valid (t_CE): 45 ns max
• Output Enable to Output Valid (t_OE): 25 ns max
• Program Pulse Width (t_PW): 50 ms max
• Program Setup Time (t_AS): 50 µs min

Package Information

The M27C2001 is available in multiple package options to suit different assembly and thermal requirements:

• Ceramic Dual-In-Line Package (CERDIP): 32-pin, UV-erase window for reprogramming.
• Plastic Dual-In-Line Package (PDIP): 32-pin, cost-effective OTP option.
• Plastic Leaded Chip Carrier (PLCC): 32-pin, surface-mount variant for space-constrained designs.

Pin Configuration (32-Pin DIP)

• Pins A0-A17: Address inputs (18-bit addressing for 256K locations).
• Pins O0-O7: Data outputs (8-bit wide).
• CE (Chip Enable): Active-low control for device selection.
• OE (Output Enable): Active-low control for output buffer.
• PGM (Program): Active-low control for programming mode (UV version only).
• V_PP: Programming voltage input (12.5V during programming).
• V_CC: +5V power supply.
• GND: Ground reference.

Programming and Erasure

The UV-erasable version of the M27C2001 requires exposure to ultraviolet light (wavelength 2537 Å) for erasure. A typical erasure time is 15-20 minutes under a UV lamp with an intensity of 12,000 µW/cm². The OTP version does not support erasure and is programmed once during production.

Programming is performed using a standard EPROM programmer, applying 12.5V to V_PP and using a 50 ms pulse width per address. Data verification is done at V_CC = 5V.

Conclusion

The M27C2001 is a versatile and reliable EPROM solution for applications requiring non-volatile memory. Its high-speed performance, low power consumption, and compatibility with industry standards make it a preferred choice for both development and production environments. With multiple package options and variants, it offers flexibility for a wide range of embedded systems.