Technical Summary: M27C4001 4 Mbit EPROM

M27C4001 - 4 Mbit (512K x 8) UV Erasable and Electrically Programmable Read-Only Memory (EPROM)

Overview

The M27C4001 is a high-performance 4 Mbit EPROM organized as 512K x 8 bits. This UV erasable and electrically programmable read-only memory is designed for applications requiring non-volatile memory with high reliability and endurance. The device features a single 5V power supply operation and is compatible with standard EPROM programmers, making it suitable for both development and production environments.

With access times as fast as 45ns, the M27C4001 is ideal for systems requiring high-speed memory access. The device offers low power consumption in both active and standby modes, making it suitable for power-sensitive applications. The memory array is accessed like standard EPROMs, with 18 address lines (A0-A17) and 8 data lines (O0-O7).

Key Features

High Density Memory: 4 Mbit capacity organized as 512K x 8
Single Power Supply: 5V ±10% operation
Fast Access Time: 45ns, 55ns, 70ns, and 90ns speed grades available
Low Power Consumption:
- Active current: 30mA typical
- Standby current: 100μA typical
UV Erasable: Windowed package allows for full UV erasure in 15-20 minutes
High Reliability: Endurance of 100 programming cycles minimum
CMOS Technology: For high performance and low power
Compatibility: Industry standard pinout and programming algorithms
Three-State Outputs: For easy bus interface

Applications

The M27C4001 is suitable for a wide range of applications including:

Microcontroller-based systems requiring firmware storage
Industrial control systems
Automotive electronics
Telecommunications equipment
Medical devices
Legacy system maintenance and upgrades
Embedded systems development
Educational and research applications

The device is particularly useful in applications where field programmability is required during development cycles, or where UV erasure provides an advantage over OTP (One-Time Programmable) solutions.

Electrical Characteristics

Absolute Maximum Ratings

Supply Voltage (V_CC): -0.6V to +7.0V
Input Voltage: -0.6V to V_CC + 0.6V
Output Voltage: -0.6V to V_CC + 0.6V
Storage Temperature: -65°C to +150°C
Operating Temperature: Commercial (0°C to +70°C) or Industrial (-40°C to +85°C)

DC Characteristics (T_A = 25°C, V_CC = 5V ±10%)

Input Leakage Current: ±1μA max
Output Leakage Current: ±1μA max
V_IL (Input Low Voltage): 0.8V max
V_IH (Input High Voltage): 2.0V min
V_OL (Output Low Voltage): 0.45V max at I_OL = 2.1mA
V_OH (Output High Voltage): 2.4V min at I_OH = -400μA

AC Characteristics

Address Access Time (t_ACC): 45ns, 55ns, 70ns, or 90ns (depending on speed grade)
Chip Enable Access Time (t_CE): 45ns, 55ns, 70ns, or 90ns
Output Enable Access Time (t_OE): 20ns max
Read Cycle Time (t_RC): 45ns, 55ns, 70ns, or 90ns
Chip Enable to Power Down (t_DP): 0ns min

Programming Characteristics

Programming Voltage (V_PP): 12.75V ±0.25V
Programming Current: 30mA max
Programming Pulse Width: 50μs
Programming Algorithm: Intelligent programming with verification
Programming Endurance: 100 cycles minimum

Package Information

The M27C4001 is available in several package options:

32-Pin Plastic DIP (DIL32)

Package Dimensions: 42.0mm x 13.9mm x 4.3mm
Lead Pitch: 2.54mm
Windowed version available for UV erasure

32-Pin PLCC (Plastic Leaded Chip Carrier)

Package Dimensions: 13.97mm x 13.97mm
Lead Pitch: 1.27mm
JEDEC Standard MO-047

32-Pin TSOP (Thin Small Outline Package)

Package Dimensions: 20mm x 10.36mm x 1.2mm
Lead Pitch: 0.8mm
Surface mount package for space-constrained applications

Handling and Reliability

The M27C4001 features robust design characteristics for reliable operation:

ESD Protection: 2000V minimum on all pins (Human Body Model)
Latch-Up Immunity: 100mA minimum
Data Retention: 10 years minimum at 55°C
UV Erasure Characteristics:
- UV Wavelength: 253.7nm
- UV Dose: 15W-sec/cm² minimum
- Erase Time: 15-20 minutes at 12,000μW/cm²