AT28C256E-20UM/883

Product Overview

Category: Integrated Circuit (IC)

Use: The AT28C256E-20UM/883 is a high-performance electrically erasable and programmable read-only memory (EEPROM) IC. It is commonly used for non-volatile storage of data in various electronic devices.

Characteristics: - High storage capacity of 256 kilobits (32 kilobytes) - Fast access time of 200 nanoseconds - Low power consumption - Durable and reliable data retention - Wide operating voltage range of 4.5V to 5.5V

Package: The AT28C256E-20UM/883 is available in a 28-pin ceramic dual inline package (CDIP). This package provides excellent protection against environmental factors such as moisture and temperature variations.

Essence: The essence of the AT28C256E-20UM/883 lies in its ability to store and retrieve data reliably, making it an essential component in many electronic systems.

Packaging/Quantity: The AT28C256E-20UM/883 is typically packaged in tubes or trays, with each tube or tray containing a specific quantity of ICs. The exact packaging and quantity may vary depending on the supplier.

Specifications

• Memory Capacity: 256 kilobits (32 kilobytes)
• Access Time: 200 nanoseconds
• Operating Voltage Range: 4.5V to 5.5V
• Package Type: 28-pin CDIP

Pin Configuration

The AT28C256E-20UM/883 has a total of 28 pins, each serving a specific function. The pin configuration is as follows:

1. A0 - Address Input
2. A1 - Address Input
3. A2 - Address Input
4. A3 - Address Input
5. A4 - Address Input
6. A5 - Address Input
7. A6 - Address Input
8. A7 - Address Input
9. A8 - Address Input
10. A9 - Address Input
11. A10 - Address Input
12. A11 - Address Input
13. A12 - Address Input
14. A13 - Address Input
15. A14 - Address Input
16. A15 - Address Input
17. OE - Output Enable
18. CE - Chip Enable
19. WE - Write Enable
20. I/O0 - Data Input/Output
21. I/O1 - Data Input/Output
22. I/O2 - Data Input/Output
23. I/O3 - Data Input/Output
24. VCC - Power Supply
25. GND - Ground
26. NC - No Connection
27. NC - No Connection
28. NC - No Connection

Functional Features

The AT28C256E-20UM/883 offers the following functional features:

• Electrically erasable and programmable memory
• Non-volatile storage of data
• High-speed access for efficient data retrieval
• Low power consumption for energy efficiency
• Durable and reliable data retention even in harsh environments

Advantages and Disadvantages

Advantages: - High storage capacity - Fast access time - Wide operating voltage range - Excellent data retention - Suitable for various electronic devices

Disadvantages: - Limited write endurance (typically around 100,000 cycles) - Relatively higher cost compared to other memory technologies

Working Principles

The AT28C256E-20UM/883 utilizes a combination of electrically controlled gates and floating gate transistors to store and retrieve data. When data is written, a high voltage is applied to the control gate, allowing electrons to tunnel onto the floating gate. This process alters the transistor's threshold voltage, representing the stored data. During read operations, the threshold voltage is measured to determine the stored data.

Detailed Application Field Plans

The AT28C256E-20UM/883 finds applications in various electronic systems that require non-volatile storage of data. Some common application fields include:

1. Embedded Systems: Used for firmware storage in microcontrollers and other embedded devices.
2. Communication Systems: Store configuration data and firmware updates in networking equipment.
3. Automotive Electronics: Used for storing calibration data, configuration settings, and firmware in automotive control units.
4. Industrial Control Systems: Store critical data and program code in industrial automation systems.
5. Consumer Electronics: Used in devices such as set-top boxes, gaming consoles, and smart appliances for data storage.

Detailed and Complete Alternative Models

1. AT28C256-15PU - Similar EEPROM IC with a slower access time of 150 nanoseconds.
2. AT28C256-25PC - EEPROM IC with a faster access time of 250