M27C800 8 Mbit EPROM

Overview

The M27C800 is an 8 Mbit (1 Megabyte) UV-erasable and electrically programmable read-only memory (EPROM) designed for use in applications requiring non-volatile storage. This component is organized as 1,048,576 words of 8 bits each, making it suitable for a wide range of embedded systems and firmware storage applications. The M27C800 features a standard parallel interface, ensuring compatibility with many microcontrollers and microprocessors.

With its robust design and reliable performance, the M27C800 is ideal for industrial, automotive, and consumer electronics applications where long-term data retention and high reliability are critical.

Features

• High Capacity: 8 Mbit (1M x 8) organization for extensive data storage.
• UV-Erasable: Allows for multiple reprogramming cycles after exposure to ultraviolet light.
• Single 5V Power Supply: Simplifies system power requirements.
• Fast Access Time: Typically 120 ns, ensuring efficient system performance.
• Low Power Consumption: Active current of 30 mA (typical), standby current of 100 µA (max).
• Wide Operating Temperature Range: -40°C to +85°C for industrial and automotive applications.
• CMOS Technology: Provides high noise immunity and low power consumption.
• Standard Pinout: Compatible with industry-standard EPROMs for easy replacement.
• Programmable Security Fuse: Protects firmware from unauthorized access.

Applications

The M27C800 is widely used in systems requiring non-volatile memory storage. Key applications include:

• Embedded Systems: Firmware storage for microcontrollers and microprocessors.
• Automotive Electronics: Engine control units (ECUs), infotainment systems, and instrument clusters.
• Industrial Control: Programmable logic controllers (PLCs) and automation equipment.
• Consumer Electronics: Legacy gaming consoles, set-top boxes, and home appliances.
• Telecommunications: Firmware storage in networking and communication devices.
• Medical Devices: Critical firmware storage in diagnostic and therapeutic equipment.

Electrical Characteristics

Absolute Maximum Ratings

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

DC Characteristics (V_CC = 5V ± 10%, T_A = -40°C to +85°C)

• Input High Voltage (V_IH): 2.0V min
• Input Low Voltage (V_IL): 0.8V max
• Output High Voltage (V_OH): 2.4V min (I_OH = -2.0 mA)
• Output Low Voltage (V_OL): 0.45V max (I_OL = 2.1 mA)
• Supply Current (Active, I_CC): 30 mA typical, 50 mA max
• Standby Current (I_SB): 100 µA max

AC Characteristics

• Access Time (t_ACC): 120 ns max
• Chip Enable to Output Delay (t_CE): 120 ns max
• Output Enable to Output Delay (t_OE): 50 ns max
• Write Pulse Width (t_WP): 100 ns min
• Data Setup Time (t_DS): 50 ns min
• Data Hold Time (t_DH): 0 ns min

Package Information

The M27C800 is available in multiple industry-standard packages, ensuring flexibility for different PCB layouts and assembly processes.

Available Packages

• 32-Pin Plastic DIP (PDIP): 600 mil width, through-hole mounting.
• 32-Pin Plastic Leaded Chip Carrier (PLCC): Surface-mount package with J-leads.
• 32-Pin Thin Small Outline Package (TSOP): Low-profile surface-mount option.

Pin Configuration (32-Pin DIP)

• Pins A0-A19: Address inputs (20-bit addressing for 1M locations).
• Pins O0-O7: Data outputs (8-bit wide).
• CE (Chip Enable): Active-low control input for device selection.
• OE (Output Enable): Active-low control input for output buffer activation.
• PGM (Program): Active-low input for programming mode.
• V_PP: Programming voltage input (12.5V during programming).
• V_CC: +5V power supply.
• GND: Ground reference.

Programming and Erasure

The M27C800 supports standard EPROM programming and erasure procedures:

Programming

• Apply V_PP = 12.5V ± 0.5V during programming.
• Use a 50 ms (min) programming pulse per address location.
• Verify data integrity after programming.

Erasure

• Expose the quartz window to UV light (2537 Å wavelength) for 15-20 minutes.
• Ensure cumulative UV dose exceeds 15 W·s/cm².
• Post-erasure, all bits should read as logic '1'.

Reliability and Quality

The M27C800 meets stringent quality and reliability standards:

• Endurance: Minimum 100 programming/erasure cycles per byte.
• Data Retention: 10 years minimum at 55°C.
• ESD Protection: >2000V