AT27C020-90JU

Product Overview

Category

AT27C020-90JU belongs to the category of programmable read-only memory (PROM) chips.

Use

It is primarily used for storing data that needs to be permanently written and cannot be modified or erased.

Characteristics

• Non-volatile: The stored data remains intact even when power is removed.
• High storage capacity: The AT27C020-90JU has a storage capacity of 2 megabits (256 kilobytes).
• Fast access time: It operates with a maximum access time of 90 nanoseconds.
• Low power consumption: The chip is designed to consume minimal power during operation.

Package

The AT27C020-90JU is available in a 32-pin PLCC (Plastic Leaded Chip Carrier) package.

Essence

The essence of AT27C020-90JU lies in its ability to provide reliable and non-volatile storage for critical data.

Packaging/Quantity

The chip is typically packaged in tubes or trays, with each tube or tray containing a specific quantity of AT27C020-90JU chips. The exact quantity may vary depending on the manufacturer's packaging specifications.

Specifications

• Storage Capacity: 2 Megabits (256 Kilobytes)
• Access Time: 90 Nanoseconds
• Supply Voltage: 5V ±10%
• Operating Temperature Range: -40°C to +85°C
• Input/Output Compatibility: TTL

Detailed Pin Configuration

The AT27C020-90JU chip has a total of 32 pins, which are assigned specific functions as follows:

1. A16: Address Input
2. A15: Address Input
3. A12: Address Input
4. A7: Address Input
5. A6: Address Input
6. A5: Address Input
7. A4: Address Input
8. A3: Address Input
9. A2: Address Input
10. A1: Address Input
11. A0: Address Input
12. VPP: Programming Voltage Input
13. OE: Output Enable
14. CE: Chip Enable
15. WE: Write Enable
16. I/O0: Data Input/Output
17. I/O1: Data Input/Output
18. I/O2: Data Input/Output
19. I/O3: Data Input/Output
20. I/O4: Data Input/Output
21. I/O5: Data Input/Output
22. I/O6: Data Input/Output
23. I/O7: Data Input/Output
24. NC: No Connection
25. GND: Ground
26. VCC: Power Supply
27. A8: Address Input
28. A9: Address Input
29. A11: Address Input
30. A10: Address Input
31. A14: Address Input
32. A13: Address Input

Functional Features

The AT27C020-90JU offers the following functional features:

• Non-volatile storage: The chip retains data even when power is removed.
• High-speed access: It provides fast access to stored data with a maximum access time of 90 nanoseconds.
• Easy integration: The chip can be easily integrated into existing electronic systems due to its standard TTL input/output compatibility.
• Low power consumption: The AT27C020-90JU is designed to operate with minimal power consumption, making it suitable for battery-powered devices.

Advantages and Disadvantages

Advantages

• Non-volatile storage ensures data integrity.
• High storage capacity allows for storing large amounts of critical data.
• Fast access time enables quick retrieval of information.
• Easy integration into existing systems due to standard TTL compatibility.
• Low power consumption makes it suitable for battery-powered devices.

Disadvantages

• Data cannot be modified or erased once written, limiting its flexibility compared to other memory technologies.
• Limited storage capacity compared to modern memory technologies.

Working Principles

The AT27C020-90JU operates based on the principle of electrical charge trapping. During programming, data is written by applying a high voltage to the appropriate address and data pins. This causes the charge to be trapped in the memory cell, representing the desired data value. Once programmed, the data remains stored until the chip is replaced or reprogrammed.

Detailed Application Field Plans

The AT27C020-90JU finds applications in various fields, including:

1. Embedded Systems: It can be used to store firmware, boot code, or configuration data in embedded systems.
2. Automotive Electronics: The chip can be utilized for storing critical data in automotive electronic control units (ECUs) or instrument clusters.
3. Industrial Control Systems: It can be employed in industrial control systems for