AT27C040-90JI

Product Overview

Category: Integrated Circuit (IC)

Use: The AT27C040-90JI is a high-performance, low-power, 4-megabit (512K x 8) electrically erasable programmable read-only memory (EEPROM). It is designed for use in various electronic devices and systems that require non-volatile storage.

Characteristics: - High-performance EEPROM with fast access times - Low power consumption - Non-volatile storage capability - Electrically erasable and reprogrammable - Large storage capacity of 4 megabits - Reliable and durable design

Package: The AT27C040-90JI is available in a 32-pin plastic J-lead chip carrier (PLCC) package. This package provides protection to the integrated circuit and facilitates easy installation on printed circuit boards.

Essence: The essence of the AT27C040-90JI lies in its ability to store data reliably and securely in a non-volatile manner. It offers a large storage capacity and fast access times, making it suitable for a wide range of applications.

Packaging/Quantity: The AT27C040-90JI is typically sold in reels or tubes, containing a specified quantity of ICs per package. The exact packaging and quantity may vary depending on the supplier.

Specifications

• Memory Size: 4 Megabits (512K x 8)
• Operating Voltage: 5V
• Access Time: 90 nanoseconds
• Erase/Write Cycle Endurance: 10,000 cycles
• Data Retention: 20 years
• Package Type: 32-pin PLCC

Pin Configuration

The AT27C040-90JI has a total of 32 pins. The pin configuration is as follows:

```

Pin Name Description

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 /OE Output Enable 12 /WE Write Enable 13 /CE Chip Enable 14 VSS Ground 15 DQ0 Data Input/Output 16 DQ1 Data Input/Output 17 DQ2 Data Input/Output 18 DQ3 Data Input/Output 19 DQ4 Data Input/Output 20 DQ5 Data Input/Output 21 DQ6 Data Input/Output 22 DQ7 Data Input/Output 23 VCC Power Supply 24 A8 Address Input 25 A9 Address Input 26 A11 Address Input 27 A10 Address Input 28 A13 Address Input 29 NC No Connection 30 NC No Connection 31 NC No Connection 32 NC No Connection ```

Functional Features

The AT27C040-90JI offers the following functional features:

1. Non-Volatile Storage: The EEPROM retains data even when power is removed, ensuring data integrity.
2. Fast Access Times: With an access time of 90 nanoseconds, the AT27C040-90JI provides quick retrieval of stored data.
3. Electrically Erasable and Reprogrammable: The IC can be easily erased and reprogrammed electrically, allowing for flexible data updates.
4. Low Power Consumption: The AT27C040-90JI operates at low power, making it suitable for battery-powered devices.
5. Large Storage Capacity: With a capacity of 4 megabits, the IC can store a significant amount of data.

Advantages and Disadvantages

Advantages: - Reliable and durable design - Non-volatile storage capability - Fast access times - Electrically erasable and reprogrammable - Large storage capacity

Disadvantages: - Limited erase/write cycle endurance (10,000 cycles) - Higher cost compared to other memory technologies

Working Principles

The AT27C040-90JI utilizes a combination of electronic circuits and memory cells to store and retrieve data. When powered on, the IC allows data to be read from its memory cells by providing the appropriate address inputs. The output enable (/OE) pin enables the data outputs, allowing the retrieved data to be accessed by the connected system.

To write or erase data, the chip enable (/CE) and write enable (/WE) pins are used in conjunction with the