AT28HC256E-12TU

Product Overview

Category

AT28HC256E-12TU belongs to the category of high-speed, low-power Electrically Erasable Programmable Read-Only Memory (EEPROM) chips.

Use

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

Characteristics

• High-speed operation: The AT28HC256E-12TU offers fast read and write operations, making it suitable for applications requiring quick access to stored data.
• Low power consumption: This EEPROM chip is designed to minimize power consumption, making it ideal for battery-powered devices.
• Large storage capacity: With a capacity of 256 kilobits (32 kilobytes), this chip provides ample space for storing critical data.
• Reliable data retention: The AT28HC256E-12TU ensures data integrity with a guaranteed minimum retention time of 10 years.
• Extended temperature range: It can operate reliably within a wide temperature range, from -40°C to +85°C.

Package and Quantity

The AT28HC256E-12TU is available in a standard 28-pin Thin Small Outline Package (TSOP). It is typically sold in reels containing multiple units, with each reel containing 250 pieces.

Specifications

• Supply voltage: 2.7V to 5.5V
• Operating current: 10 mA (typical)
• Standby current: 1 µA (typical)
• Access time: 120 ns (maximum)
• Write cycle time: 12 ms (maximum)
• Data retention: 10 years (minimum)

Pin Configuration

The AT28HC256E-12TU has a total of 28 pins, each serving a specific function. The pin configuration is as follows:

```

Pin Name Function

1 A14 Address Input 2 A12 Address Input 3 A7 Address Input 4 A6 Address Input 5 A5 Address Input 6 A4 Address Input 7 A3 Address Input 8 A2 Address Input 9 A1 Address Input 10 A0 Address Input 11 CE Chip Enable Input 12 OE Output Enable Input 13 WE Write Enable Input 14 I/O0 Data Input/Output 15 I/O1 Data Input/Output 16 I/O2 Data Input/Output 17 I/O3 Data Input/Output 18 VCC Supply Voltage 19 GND Ground 20 NC No Connection 21 A8 Address Input 22 A9 Address Input 23 A11 Address Input 24 A13 Address Input 25 A10 Address Input 26 I/O4 Data Input/Output 27 I/O5 Data Input/Output 28 I/O6 Data Input/Output ```

Functional Features

• Random access: The AT28HC256E-12TU allows for random access to any memory location, enabling efficient data retrieval.
• Byte-wise programming: It supports byte-wise programming, allowing users to modify specific portions of the memory without affecting other data.
• Hardware and software protection: This EEPROM chip provides both hardware and software protection mechanisms to prevent unauthorized access or accidental modification of stored data.
• High endurance: With a minimum of 100,000 write cycles, the AT28HC256E-12TU offers high endurance, ensuring reliable and long-lasting operation.

Advantages and Disadvantages

Advantages

• Fast read and write operations
• Low power consumption
• Large storage capacity
• Reliable data retention
• Extended temperature range

Disadvantages

• Relatively slower write cycle time compared to some newer EEPROM chips
• Limited availability of alternative models with similar specifications

Working Principles

The AT28HC256E-12TU utilizes a combination of electronic circuits and memory cells to store and retrieve data. It employs a floating-gate transistor structure that allows for non-volatile storage of information. The chip uses a series of address lines to select the desired memory location, and data is read or written through dedicated input/output lines.

Application Field Plans

The AT28HC256E-12TU finds applications in various fields, including: 1. Embedded systems: Used for firmware storage in microcontrollers and other embedded devices. 2. Computer systems: Employed for storing BIOS (Basic Input/Output System) and configuration data. 3. Consumer electronics: Utilized in devices such as smart TVs, set-top boxes, and gaming consoles for data storage and firmware updates. 4. Automotive electronics: Used for storing critical data in automotive control units and infotainment systems.