M27C322 32 Mbit EPROM

Overview

The M27C322 is a high-density 32 Mbit (4M x 8-bit) UV-erasable programmable read-only memory (EPROM) designed for applications requiring non-volatile storage. This component features ultra-violet (UV) erase capability, allowing for complete data erasure and reprogramming, making it ideal for development environments and applications requiring firmware updates. The M27C322 operates on a single 5V power supply and is designed for compatibility with a wide range of microprocessors and microcontrollers.

With its high storage capacity and reliable performance, the M27C322 is well-suited for embedded systems, industrial controls, and legacy computing applications where firmware or configuration data must be retained without power. The device offers fast access times and low power consumption, making it a versatile choice for both commercial and industrial temperature ranges.

Features

• High Density Storage: 32 Mbit (4,194,304 x 8-bit) organization
• UV Erasable: Full chip erase via exposure to ultraviolet light
• Single 5V Supply: Operates on +5V ±10%
• Fast Access Time: Available in 70ns, 90ns, and 120ns speed grades
• Low Power Consumption: Active current of 30mA (typical), standby current of 100µA (typical)
• Wide Temperature Range: Commercial (0°C to +70°C) and Industrial (-40°C to +85°C) options
• CMOS Technology: Low power consumption with high noise immunity
• Tri-State Outputs: Allows for direct connection to system buses
• Programmable Security Code: Optional security feature to protect firmware
• JEDEC Standard Pinout: Compatible with industry-standard EPROM sockets

Applications

The M27C322 is designed for use in a variety of electronic systems requiring reliable, non-volatile memory storage:

• Embedded Systems: Firmware storage for microcontrollers and microprocessors
• Industrial Controls: Program storage for PLCs and automation equipment
• Telecommunications: Code storage in networking equipment
• Medical Equipment: Firmware storage in diagnostic and monitoring devices
• Automotive Electronics: Engine control units and infotainment systems
• Legacy Computing: BIOS storage for older computer systems
• Test and Measurement Equipment: Calibration data and instrument firmware

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
• Storage Temperature: -65°C to +150°C
• Operating Temperature: Commercial: 0°C to +70°C; Industrial: -40°C to +85°C

DC Characteristics

• Input Leakage Current: ±1µA (max) at Vcc = 5.5V
• Output Leakage Current: ±1µA (max) at Vcc = 5.5V
• Standby Current: 100µA (max) at Vcc = 5.5V
• Active Current: 30mA (typical) at Vcc = 5V, f = 1MHz
• Input Low Voltage: 0.8V (max)
• Input High Voltage: 2.0V (min)
• Output Low Voltage: 0.45V (max) at IOL = 2.1mA
• Output High Voltage: 2.4V (min) at IOH = -400µA

AC Characteristics

• Address Access Time: 70ns, 90ns, or 120ns (depending on speed grade)
• Chip Enable Access Time: 70ns, 90ns, or 120ns
• Output Enable Access Time: 35ns (max)
• Chip Enable to Power Down: 0ns (min)
• Output Hold Time: 10ns (min)
• Read Cycle Time: 70ns, 90ns, or 120ns

Package Information

The M27C322 is available in several industry-standard packages:

32-Pin Plastic DIP (Dual In-line Package)

• Package Code: PDIP32
• Dimensions: 15.24mm x 42.04mm
• Pin Pitch: 2.54mm
• Lead Count: 32
• Material: Molded plastic

32-Pin PLCC (Plastic Leaded Chip Carrier)

• Package Code: PLCC32
• Dimensions: 13.97mm x 13.97mm
• Lead Pitch: 1.27mm
• Lead Count: 32
• Material: Molded plastic

32-Pin TSOP (Thin Small Outline Package)

• Package Code: TSOP32
• Dimensions: 8mm x 20mm
• Pin Pitch: 0.8mm
• Lead Count: 32
• Material: Molded plastic

Programming and Erasure

The M27C322 supports standard EPROM programming procedures:

Programming Characteristics

• Programming Voltage (Vpp): 12.75V ±0.25V
• Programming Pulse Width: 50ms (max)
• Programming Algorithm: Intelligent programming with verification
• Programming Temperature: 25°C ±5°C recommended

UV Erasure Specifications

• UV Wavelength: 2537Å (recommended)
• UV Intensity: 12,000µW/cm² (minimum)
• Erasure Time: 15-20 minutes (typical at 1cm distance)
• Erasure Verification: All bits read as FFh after complete erasure

Quality and Reliability

The M27C322 meets stringent quality and reliability standards:

• Endurance: Minimum 100 program/erase cycles
• Data Retention: 10 years minimum at 85°C
• ESD Protection: 2000V minimum on all pins (Human Body Model)
• Latch-Up Protection: Exceeds 100mA per JEDEC Standard 17

Ordering Information

The M27C322 is available in various speed grades and temperature ranges:

• M27C322-70F1: 70ns access time, Commercial temperature range, PDIP package
• M27C322-90F1: 90ns access time, Commercial temperature range, PDIP package
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