27C1024

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M27C1024 - 1 Mbit (128K x 8) UV Erasable Programmable Read-Only Memory (EPROM)

Overview

The M27C1024 is a high-performance 1 Megabit (128K x 8) UV-erasable programmable read-only memory (EPROM) designed for use in applications requiring non-volatile storage. This component provides reliable data retention and is capable of withstanding extended periods of operation in demanding environments. The M27C1024 is fabricated with advanced CMOS technology, offering low power consumption while maintaining high-speed performance. The device is organized as 131,072 words of 8 bits each, making it suitable for a wide range of microprocessor-based systems.

Key Features

• High-Speed Access Time: 70 ns, 90 ns, and 120 ns variants available for flexibility in system design.
• Low Power Consumption: Active current of 30 mA (typical) and standby current of 100 µA (typical), making it suitable for power-sensitive applications.
• UV Erasable: Data can be erased via exposure to ultraviolet light, allowing for reprogramming and reuse.
• Single 5V Power Supply: Simplifies system power requirements and compatibility with standard logic levels.
• Tri-State Outputs: Supports bus-oriented systems with high-impedance outputs when deselected.
• Wide Operating Temperature Range: Commercial (0°C to +70°C) and Industrial (-40°C to +85°C) variants available.
• JEDEC Standard Pinout: Ensures compatibility with industry-standard EPROM sockets and designs.
• Programmable Security Fuse: Provides software and hardware protection for proprietary code.

Applications

The M27C1024 is widely used in embedded systems and applications requiring non-volatile firmware storage. Key application areas include:

• Microcontroller-Based Systems: Firmware storage for industrial control, automotive, and consumer electronics.
• Legacy Computing: BIOS and boot ROM storage in older computer systems.
• Telecommunications: Program storage in networking and communication devices.
• Test and Measurement Equipment: Calibration data and operational firmware storage.
• Medical Devices: Reliable code storage in critical healthcare 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 (Industrial), 0°C to +70°C (Commercial)
• Storage Temperature Range: -65°C to +150°C

DC Characteristics (V_CC = 5V ± 10%, T_A = 25°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): 30 mA (typical), 50 mA (max)
• Supply Current (Standby): 100 µA (typical), 500 µA (max)

AC Characteristics

• Address Access Time (t_ACC): 70 ns, 90 ns, or 120 ns (depending on speed grade)
• Chip Enable Access Time (t_CE): 70 ns, 90 ns, or 120 ns
• Output Enable Access Time (t_OE): 35 ns max
• Write Pulse Width (t_PW): 50 ms min (programming)
• Program/Erase Cycles: Minimum 100 cycles guaranteed

Package Information

The M27C1024 is available in multiple industry-standard packages, ensuring compatibility with a wide range of PCB designs and socket types.

• 32-Pin Plastic Dual In-Line Package (PDIP):
  • Package Dimensions: 15.24 mm x 6.48 mm (600 mil width)
  • Lead Pitch: 2.54 mm (100 mil)
• 32-Pin Ceramic Dual In-Line Package (CERDIP):
  • Package Dimensions: 15.24 mm x 6.48 mm (600 mil width)
  • Lead Pitch: 2.54 mm (100 mil)
  • Hermetically sealed for high-reliability applications
• 32-Pin Plastic Leaded Chip Carrier (PLCC):
  • Package Dimensions: 13.97 mm x 13.97 mm
  • Lead Pitch: 1.27 mm (50 mil)
  • Surface-mountable for compact designs

Programming and Erasure

The M27C1024 supports standard EPROM programming and erasure procedures:

• Programming: Requires a 12.75V programming voltage (V_PP) and a series of 50 ms programming pulses per address.
• Verification: Data integrity is verified at V_CC = 5V ± 5% after programming.
• UV Erasure: Full erasure is achieved after exposure to UV light (wavelength 2537 Å) for 15-20 minutes at an intensity of 12,000 µW/cm².

Ordering Information

The M27C1024 is available in multiple speed grades and package options. The ordering code follows the format: M27C1024-XXXY, where:

• XXX denotes the speed grade (e.g., 70, 90, or 120 for 70 ns, 90 ns, or 120 ns access time).
• Y denotes the package type (e.g., F for PDIP, Q for PLCC, D for CERDIP).

Example: M27C1024-90F indicates a 90 ns access time device in a 32-pin PDIP package.

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