Technical Summary: M87C257 High-Speed 262,144-Bit UV-Erasable PROM

Overview

The M87C257 is a high-speed, UV-erasable programmable read-only memory (PROM) with a storage capacity of 262,144 bits (32K x 8). This component is designed for applications requiring non-volatile memory with fast access times and reliable data retention. The M87C257 is fabricated using advanced CMOS technology, ensuring low power consumption while maintaining high performance. Its UV-erasable feature allows for multiple reprogramming cycles, making it suitable for prototyping and development environments.

Features

• High-Speed Operation: Fast access times, making it ideal for performance-critical applications.
• UV-Erasable: Allows for multiple reprogramming cycles, facilitating iterative development and testing.
• Large Storage Capacity: 262,144-bit organization (32K x 8) for substantial data storage needs.
• Low Power Consumption: Advanced CMOS technology ensures efficient power usage, suitable for battery-operated devices.
• Wide Operating Voltage Range: Supports a broad range of supply voltages, enhancing compatibility with various systems.
• Two-Line Control Interface: Simplifies integration and reduces the need for complex control logic.
• High Reliability: Robust design ensures long-term data retention and durability under varying environmental conditions.
• Industry-Standard Pinout: Compatible with existing designs and easy to replace in legacy systems.

Applications

The M87C257 is versatile and can be used in a wide range of applications, including but not limited to:

• Embedded Systems: Firmware storage for microcontrollers and other embedded devices.
• Industrial Control Systems: Non-volatile memory for programmable logic controllers (PLCs) and automation equipment.
• Telecommunications: Data storage in networking and communication devices.
• Automotive Electronics: Reliable memory for engine control units (ECUs) and infotainment systems.
• Medical Devices: Secure storage for critical firmware in medical instrumentation.
• Consumer Electronics: Used in gaming consoles, set-top boxes, and other high-performance consumer products.
• Military and Aerospace: High-reliability applications where data integrity is paramount.

Electrical Characteristics

Absolute Maximum Ratings

• Supply Voltage (V_CC): -0.5V to +7.0V
• Input Voltage (V_IN): -0.5V to V_CC + 0.5V
• Operating Temperature Range: -40°C to +85°C
• Storage Temperature Range: -65°C to +150°C

Recommended Operating Conditions

• Supply Voltage (V_CC): 4.5V to 5.5V
• Input High Voltage (V_IH): 2.0V to V_CC
• Input Low Voltage (V_IL): -0.5V to 0.8V
• Operating Temperature: 0°C to +70°C (commercial), -40°C to +85°C (industrial)

DC Characteristics

• Standby Current (I_SB): ≤ 10 µA (typical)
• Operating Current (I_CC): ≤ 30 mA (at 5 MHz)
• Output High Voltage (V_OH): ≥ 2.4V (at I_OH = -2.0 mA)
• Output Low Voltage (V_OL): ≤ 0.4V (at I_OL = 2.0 mA)

AC Characteristics

• Access Time (t_ACC): 90 ns (max)
• Chip Enable to Output Delay (t_CE): 70 ns (max)
• Output Enable to Output Delay (t_OE): 35 ns (max)
• Write Pulse Width (t_WP): 100 ns (min)

Package Information

The M87C257 is available in multiple package options to suit various application requirements:

• 28-Pin Plastic Dual In-Line Package (PDIP): Industry-standard through-hole package for easy prototyping and testing.
• 28-Pin Plastic Leaded Chip Carrier (PLCC): Surface-mount package for space-constrained applications.
• 32-Pin Thin Small Outline Package (TSOP): Compact form factor for high-density PCB designs.

Pin Configuration (28-Pin PDIP)

• Pins 1-14: Address Inputs (A₀-A₁₄)
• Pins 15-22: Data Inputs/Outputs (D₀-D₇)
• Pin 23: Chip Enable (CE)
• Pin 24: Output Enable (OE)
• Pin 25: Program Enable (PGM)
• Pin 26: V_PP (Programming Voltage)
• Pin 27: V_CC (Supply Voltage)
• Pin 28: Ground (GND)

Conclusion

The M87C257 is a high-performance, UV-erasable PROM that combines large storage capacity, fast access times, and low power consumption. Its robust design and versatile package options make it suitable for a wide range of applications, from industrial control systems to consumer electronics. With its reliable data retention and ease of reprogramming, the M87C257 is an excellent choice for developers and engineers seeking a non-volatile memory solution.