AT27C256R-70PC

Product Overview

Category

AT27C256R-70PC 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 is commonly employed in various electronic devices and systems.

Characteristics

• Non-volatile: The stored data remains intact even without power supply.
• High storage capacity: The AT27C256R-70PC has a capacity of 256 kilobits (32 kilobytes).
• Fast access time: It offers a maximum access time of 70 nanoseconds.
• Low power consumption: This chip operates on low power, making it suitable for battery-powered devices.

Package

The AT27C256R-70PC comes in a 28-pin plastic dual in-line package (PDIP).

Essence

The essence of this product lies in its ability to provide non-volatile storage for critical data in electronic systems.

Packaging/Quantity

The AT27C256R-70PC is typically packaged in tubes or trays, with a quantity of 25 pieces per tube/tray.

Specifications

• Memory Capacity: 256 kilobits (32 kilobytes)
• Access Time: 70 nanoseconds
• Supply Voltage: 4.5V to 5.5V
• Operating Temperature Range: -40°C to +85°C
• Package Type: 28-pin PDIP

Detailed Pin Configuration

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

Functional Features

• Non-volatile storage: The AT27C256R-70PC retains data even when power is turned off.
• High-speed access: It offers fast access times, allowing for efficient data retrieval.
• Easy integration: This chip can be easily integrated into various electronic systems due to its standard pin configuration and package.

Advantages and Disadvantages

Advantages

• Non-volatile memory ensures data retention without power supply.
• High storage capacity allows for storing a significant amount of data.
• Fast access time enables quick retrieval of stored information.
• Low power consumption makes it suitable for battery-powered devices.

Disadvantages

• Data cannot be modified or erased once programmed.
• Limited storage capacity compared to other memory technologies.
• Relatively higher cost per bit compared to some alternative memory solutions.

Working Principles

The AT27C256R-70PC operates based on the principle of electrical programming. Once programmed, the stored data remains unchanged until the next programming operation. The chip utilizes a combination of address lines, control signals, and data lines to read the stored information.

Detailed Application Field Plans

The AT27C256R-70PC finds applications in various fields, including: 1. Embedded systems: Used for firmware storage in microcontrollers and microprocessors. 2. Automotive electronics: Employed for storing critical data in automotive control units. 3. Industrial automation: Utilized for storing configuration data in programmable logic controllers (PLCs). 4. Consumer electronics: Used in devices such as gaming consoles, set-top boxes, and digital cameras for firmware storage.

Detailed and Complete Alternative Models

1. AT28C256-15PC: Similar to the AT27C256R-70PC, but with a slower access time of 150 nanoseconds.
2. AT29C256-12PC: Offers a faster access time of 120 nanoseconds compared to the AT27C256R-70PC.
3. AM27C256-200DC: An alternative from a different manufacturer, offering a higher access time of 200 nanoseconds.

These alternative models provide similar functionality and can be considered based on specific requirements and availability.

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