AT27C020-90PC

Product Overview

Category

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

Use

This product is primarily used for storing data that needs to be permanently retained, even when power is turned off. It allows users to program and store data that cannot be modified or erased.

Characteristics

• Non-volatile: The stored data remains intact even without power.
• High capacity: The AT27C020-90PC has a storage capacity of 2 megabits (256 kilobytes).
• Fast access time: With an access time of 90 nanoseconds, it provides quick retrieval of stored data.
• Durable: The chip is designed to withstand multiple read operations without degradation.

Package

The AT27C020-90PC comes in a 32-pin plastic dual in-line package (PDIP).

Essence

The essence of this product lies in its ability to provide non-volatile storage of data, making it suitable for applications where permanent data retention is required.

Packaging/Quantity

The AT27C020-90PC 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 supplier.

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 AT27C020-90PC 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 Input
14. CE: Chip Enable Input
15. WE: Write Enable Input
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

• Non-volatile storage of data
• High capacity for storing large amounts of data
• Fast access time for quick retrieval
• Compatibility with TTL and CMOS input/output systems
• Durable design for multiple read operations

Advantages and Disadvantages

Advantages

• Permanent data retention even without power
• Large storage capacity
• Quick access time
• Compatibility with different input/output systems

Disadvantages

• Inability to modify or erase stored data
• Limited availability of alternative models

Working Principles

The AT27C020-90PC operates by using a combination of address inputs, control inputs, and data inputs/outputs. When the chip enable (CE) input is activated along with the correct address inputs, the stored data at that specific address location can be accessed through the data input/output pins. The output enable (OE) and write enable (WE) inputs control the read and write operations, respectively.

Detailed Application Field Plans

The AT27C020-90PC finds applications in various fields where permanent data storage is required. Some of the common application areas include: - Embedded systems - Automotive electronics - Industrial control systems - Medical devices - Communication equipment

Detailed and Complete Alternative Models

While the AT27C020-90PC is a widely used PROM chip, there are alternative models available from different manufacturers. Some popular alternatives to consider are: - AM27C020-90PC by AMD - M27C2001-90PC1 by STMicroelectronics - W27C020-70Z by Winbond Electronics

These alternative models offer similar functionality and specifications, providing users with options based on their specific requirements.

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