AT28C256-15PC

Product Overview

Category

AT28C256-15PC belongs to the category of electrically erasable programmable read-only memory (EEPROM) chips.

Use

This chip is commonly used for non-volatile storage in various electronic devices, such as microcontrollers, computers, and consumer electronics.

Characteristics

• Non-volatile: Retains data even when power is removed.
• Electrically erasable: Can be erased and reprogrammed electronically.
• High storage capacity: The AT28C256-15PC has a capacity of 256 kilobits (32 kilobytes).
• Low power consumption: Operates on low power supply voltages.
• Fast access time: Provides quick access to stored data.

Package

The AT28C256-15PC is available in a 28-pin plastic dual in-line package (PDIP).

Essence

The essence of the AT28C256-15PC is its ability to store and retrieve digital information reliably and efficiently.

Packaging/Quantity

This chip is typically sold in tubes or trays containing multiple units. The exact quantity may vary depending on the supplier.

Specifications

• Supply voltage: 4.5V to 5.5V
• Access time: 150 nanoseconds
• Operating temperature range: -40°C to +85°C
• Data retention: 10 years
• Endurance: 100,000 write cycles

Detailed Pin Configuration

The AT28C256-15PC has a total of 28 pins, each serving a specific function. 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 voltage
6. GND: Ground
7. DQ0-DQ7: Data input/output lines
8. NC: No connection (unused pin)

Functional Features

• Random access: Allows direct access to any memory location.
• Byte-wise programming: Enables individual bytes to be programmed or erased.
• Block erase capability: Supports erasing a block of memory at once.
• Hardware data protection: Provides write protection for specific memory locations.
• Automatic page write: Facilitates faster programming of multiple bytes.

Advantages and Disadvantages

Advantages

• Non-volatile storage: Retains data without power, ensuring data integrity.
• Electrically erasable: Allows for easy reprogramming without removing the chip.
• High storage capacity: Offers ample space for storing data.
• Low power consumption: Helps conserve energy in battery-powered devices.
• Fast access time: Enables quick retrieval of information.

Disadvantages

• Limited endurance: The chip has a finite number of write cycles before it may become unreliable.
• Relatively small capacity: Compared to other memory technologies, the AT28C256-15PC has a moderate storage capacity.

Working Principles

The AT28C256-15PC utilizes a combination of electronic circuits and memory cells to store and retrieve digital data. When powered on, the chip allows reading from or writing to specific memory locations based on the control signals received.

During a write operation, the desired data is sent to the chip's input pins along with the appropriate control signals. The data is then stored in the specified memory location. Reading data involves sending the address of the desired location and enabling the output pins to retrieve the stored information.

Detailed Application Field Plans

The AT28C256-15PC finds applications in various fields, including:

1. Microcontrollers: Used for storing program code and data in embedded systems.
2. Computers: Employed as non-volatile memory for storing BIOS settings and firmware.
3. Consumer electronics: Utilized in devices like digital cameras, printers, and set-top boxes for data storage.

Detailed and Complete Alternative Models

1. AT28C256-12PC: Similar to the AT28C256-15PC but with a faster access time of 120 nanoseconds.
2. AT28C256-20PC: Offers a slower access time of 200 nanoseconds but may be more cost-effective.
3. AT28C256-25PC: Provides an access time of 250 nanoseconds and is suitable for applications with less stringent timing requirements.

These alternative models offer different performance characteristics while maintaining compatibility with the same pin configuration and package type.

In conclusion, the AT28C256-15PC is a versatile EEPROM chip that combines non-volatile storage, ease of reprogramming, and high capacity. Its fast access time and low power consumption make it suitable for various electronic applications. However, its limited endurance and relatively small capacity should be considered when selecting this chip for specific projects.