AT27C020-90PU

Product Overview

Category

AT27C020-90PU 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 turned off.
• High storage capacity: The AT27C020-90PU has a storage capacity of 2 megabits (256 kilobytes).
• Fast access time: It offers a fast access time of 90 nanoseconds.
• Low power consumption: The chip operates on low power, making it energy-efficient.

Package

The AT27C020-90PU comes in a plastic DIP (Dual In-line Package) with 32 pins.

Essence

The essence of AT27C020-90PU lies in its ability to provide non-volatile storage of data, ensuring long-term data retention without the risk of accidental modification or erasure.

Packaging/Quantity

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

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, CMOS

Detailed Pin Configuration

The AT27C020-90PU 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. /OE: Output Enable
13. /CE: Chip Enable
14. VPP: Programming Voltage
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. /WE: Write Enable
25. NC: No Connection
26. NC: No Connection
27. NC: No Connection
28. NC: No Connection
29. NC: No Connection
30. NC: No Connection
31. GND: Ground
32. A8: Address Input

Functional Features

• Non-volatile storage of data
• Fast access time for efficient data retrieval
• Low power consumption for energy efficiency
• Compatibility with TTL and CMOS input/output systems
• Reliable long-term data retention

Advantages and Disadvantages

Advantages

• Non-volatile memory ensures data integrity even during power loss.
• High storage capacity allows for storing large amounts of data.
• Fast access time enables quick retrieval of stored information.
• Low power consumption makes it suitable for battery-powered devices.

Disadvantages

• The data stored in the AT27C020-90PU cannot be modified or erased, limiting its flexibility compared to other types of memory.
• The chip requires a programming voltage (VPP) for initial data programming, which may require additional circuitry.

Working Principles

The AT27C020-90PU operates based on the principle of electrical charge trapping. The data is programmed into the memory cells during the manufacturing process and remains stored as electrical charges within the cells. When an address is provided, the chip retrieves the corresponding data from the memory cells and outputs it through the data pins.

Detailed Application Field Plans

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

1. Embedded Systems: It can be used to store firmware or configuration data in embedded systems such as microcontrollers.
2. Automotive Electronics: The chip can store critical data for automotive applications, such as engine control units or infotainment systems.
3. Industrial Control Systems: It is suitable for storing program code or configuration data in industrial control systems.
4. Medical Devices: The AT27C020-90PU can be utilized in medical devices for storing patient data or firmware.
5. Consumer Electronics: It can be employed in consumer electronics products like set-top boxes or gaming consoles for storing system software or game data