27C405 Datasheet | Next Electromics

M27C405 4 Mbit EPROM Technical Summary

Overview

The M27C405 is a high-performance 4 Mbit (512K x 8-bit) EPROM (Erasable Programmable Read-Only Memory) device offered in the OTP (One Time Programmable) range. This component is designed for applications requiring non-volatile memory storage with high reliability and fast access times. The M27C405 is fabricated using advanced CMOS technology, providing low power consumption while maintaining high-speed operation.

This EPROM is organized as 524,288 words of 8 bits each, making it suitable for a wide range of microprocessor-based systems. The device features a single 5V power supply operation and is compatible with industry-standard EPROM pinouts, ensuring easy integration into existing designs.

Features

High-Density Memory: 4 Mbit capacity organized as 512K x 8 bits
Single Power Supply: 5V ±10% operation
Fast Access Time: 70 ns, 90 ns, and 120 ns speed grades available
Low Power Consumption:
- Active current: 30 mA (typical)
- Standby current: 100 µA (typical)
CMOS Technology: Provides high noise immunity and low power consumption
OTP (One Time Programmable): Programmable by the user with standard EPROM programmers
Compatibility: Industry-standard pinout for easy replacement
Three-State Outputs: For easy interface with system buses
Reliable Operation:
- Data retention: 10 years minimum
- Endurance: Minimum 100 programming cycles

Applications

The M27C405 is suitable for a wide range of applications requiring non-volatile memory storage, including:

Microcontroller-based systems
Industrial control systems
Automotive electronics
Telecommunications equipment
Medical devices
Consumer electronics
Embedded systems
Legacy system upgrades and repairs

The device's combination of density, speed, and reliability makes it particularly suitable for applications where program code or fixed data needs to be stored securely and accessed quickly.

Electrical Characteristics

Absolute Maximum Ratings

Supply Voltage (V_CC): -0.5V to +7.0V
Input Voltage: -0.5V to V_CC + 0.5V
Output Voltage: -0.5V to V_CC + 0.5V
Operating Temperature Range:
- Commercial: 0°C to +70°C
- Industrial: -40°C to +85°C
Storage Temperature: -65°C to +150°C

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

Input Leakage Current (I_IN): ±1 µA (max)
Output Leakage Current (I_OUT): ±1 µA (max)
Standby Current (I_SB): 100 µA (max)
Active Current (I_CC): 30 mA (typical), 50 mA (max)
Input Low Voltage (V_IL): 0.8V (max)
Input High Voltage (V_IH): 2.0V (min)
Output Low Voltage (V_OL): 0.45V (max) at I_OL = 2.1 mA
Output High Voltage (V_OH): 2.4V (min) at I_OH = -400 µA

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)
Chip Enable to Output in Low-Z (t_DF): 0 ns to 35 ns
Output Hold from Address Change (t_OH): 0 ns (min)
Read Cycle Time (t_RC): 70 ns, 90 ns, or 120 ns

Package Information

The M27C405 is available in several industry-standard packages:

32-Pin Plastic DIP (Dual In-line Package):
- Package Code: DIP-32
- Dimensions: 42.04 mm x 13.97 mm (typical)
- Lead Pitch: 2.54 mm
32-Pin PLCC (Plastic Leaded Chip Carrier):
- Package Code: PLCC-32
- Dimensions: 13.97 mm x 13.97 mm (typical)
- Lead Pitch: 1.27 mm
32-Pin TSOP (Thin Small Outline Package):
- Package Code: TSOP-32
- Dimensions: 20 mm x 10 mm (typical)
- Lead Pitch: 0.8 mm