AT28C256-20FM/883

Product Overview

Category

AT28C256-20FM/883 belongs to the category of non-volatile memory devices.

Use

This product is commonly used for storing and retrieving digital information in various electronic systems.

Characteristics

• Non-volatile: The stored data remains intact even when power is removed.
• High capacity: The AT28C256-20FM/883 has a storage capacity of 256 kilobits (32 kilobytes).
• Fast access time: It operates at a speed of 200 nanoseconds, allowing for quick data retrieval.
• Low power consumption: This device is designed to minimize power usage, making it suitable for battery-powered applications.

Package

The AT28C256-20FM/883 is available in a 28-pin ceramic package.

Essence

This product is an electrically erasable and programmable read-only memory (EEPROM) chip.

Packaging/Quantity

The AT28C256-20FM/883 is typically sold in reels or tubes, with a quantity of 25 units per package.

Specifications

• Supply voltage: 4.5V to 5.5V
• Operating temperature range: -40°C to +85°C
• Input/output voltage levels compatible with both TTL and CMOS logic
• Data retention: 10 years
• Endurance: 100,000 write cycles

Pin Configuration

The AT28C256-20FM/883 features a total of 28 pins, each serving a specific purpose. Here is a detailed pin configuration:

1. A0-A14: Address inputs
2. CE: Chip enable input
3. OE: Output enable input
4. WE: Write enable input
5. VCC: Power supply
6. GND: Ground
7. DQ0-DQ7: Data input/output

Functional Features

• Byte-wise programmable: The AT28C256-20FM/883 allows individual bytes to be programmed or erased.
• High-speed operation: With a fast access time of 200 nanoseconds, it enables efficient data retrieval.
• Hardware and software data protection: This device offers various mechanisms to prevent accidental modification or erasure of stored data.
• Low power consumption: The AT28C256-20FM/883 is designed to minimize power usage, making it suitable for battery-powered applications.

Advantages and Disadvantages

Advantages

• Non-volatile memory ensures data retention even during power loss.
• High storage capacity for a wide range of applications.
• Fast access time allows for quick data retrieval.
• Low power consumption extends battery life in portable devices.

Disadvantages

• Limited endurance compared to other memory technologies.
• Relatively higher cost per bit compared to some alternatives.
• Requires additional circuitry for programming and erasing operations.

Working Principles

The AT28C256-20FM/883 utilizes the principle of electrically erasable and programmable read-only memory (EEPROM). It stores digital information by trapping electrical charges within its memory cells. These charges can be selectively removed or added using specific voltage levels applied to the control inputs. This allows for both programming and erasing of data on a byte-by-byte basis.

Detailed Application Field Plans

The AT28C256-20FM/883 finds applications in various electronic systems, including but not limited to: - Embedded systems - Automotive electronics - Industrial control systems - Communication devices - Consumer electronics

Detailed and Complete Alternative Models

1. AT28C256-15PU: Similar to AT28C256-20FM/883, but with a slower access time of 150 nanoseconds.
2. AT28C256-25PC: Similar to AT28C256-20FM/883, but with a faster access time of 250 nanoseconds.
3. AT28C256-30DM/883: Similar to AT28C256-20FM/883, but with a higher endurance of 1,000,000 write cycles.

These alternative models offer different specifications and may be suitable for specific application requirements.

In conclusion, the AT28C256-20FM/883 is a non-volatile memory device with a high storage capacity and fast access time. It is widely used in various electronic systems due to its reliability, low power consumption, and byte-wise programmability. While it has some limitations, there are alternative models available to cater to different application needs.