AT29C257-20JC

Product Overview

Category

AT29C257-20JC belongs to the category of non-volatile memory integrated circuits.

Use

It is primarily used for storing and retrieving digital information in electronic devices.

Characteristics

• Non-volatile: Retains data even when power is turned off.
• High capacity: The AT29C257-20JC has a storage capacity of 256 kilobits.
• Fast access time: It operates at a speed of 200 nanoseconds.
• Low power consumption: Designed to minimize power usage.
• Reliable: Offers high endurance and data retention capabilities.

Package

The AT29C257-20JC is available in a 32-pin PLCC (Plastic Leaded Chip Carrier) package.

Essence

This product is an essential component for storing firmware, program code, and other critical data in various electronic devices.

Packaging/Quantity

The AT29C257-20JC is typically packaged in reels or tubes, with each containing a specific quantity of chips. The exact packaging and quantity may vary depending on the supplier.

Specifications

• Memory Type: Electrically Erasable Programmable Read-Only Memory (EEPROM)
• Organization: 32K x 8 bits
• Supply Voltage: 5V
• Access Time: 200 ns
• Operating Temperature Range: -40°C to +85°C
• Data Retention: 10 years
• Erase/Write Cycle Endurance: 100,000 cycles

Detailed Pin Configuration

The AT29C257-20JC has a total of 32 pins, which are assigned specific functions. Here is the detailed pin configuration:

1. A16
2. A15
3. A12
4. A7
5. A6
6. A5
7. A4
8. A3
9. A2
10. A1
11. A0
12. VPP
13. OE#
14. CE#
15. WE#
16. I/O0
17. I/O1
18. I/O2
19. I/O3
20. I/O4
21. I/O5
22. I/O6
23. I/O7
24. VCC
25. GND
26. NC
27. NC
28. NC
29. NC
30. NC
31. NC
32. NC

Functional Features

• Byte-wide operations: Supports both byte-level read and write operations.
• Chip enable control: The CE# pin allows for easy activation or deactivation of the chip.
• Output enable control: The OE# pin enables or disables the output buffers, facilitating data retrieval.
• Write enable control: The WE# pin controls the write operation, ensuring data integrity.

Advantages and Disadvantages

Advantages

• Non-volatile memory: Data retention even without power supply.
• High capacity: Ample storage space for various applications.
• Fast access time: Quick retrieval of stored information.
• Low power consumption: Energy-efficient design.
• Reliable: Ensures data integrity and longevity.

Disadvantages

• Limited erase/write cycle endurance: The chip has a finite number of erase/write cycles before it may become unreliable.
• Relatively higher cost compared to other memory technologies.

Working Principles

The AT29C257-20JC utilizes EEPROM technology, which allows for electrically erasing and reprogramming of data. It stores information in a grid of memory cells that can be individually accessed and modified using specific control signals. When data needs to be written or erased, the appropriate voltage levels are applied to the corresponding pins, enabling the desired operation.

Detailed Application Field Plans

The AT29C257-20JC finds applications in various electronic devices, including but not limited to: - Microcontrollers - Embedded systems - Communication devices - Automotive electronics - Industrial control systems

Detailed and Complete Alternative Models

• AT28C256: Similar capacity and functionality, but with a slower access time.
• AT49BV256: Flash memory alternative with faster erase/write cycles but lower endurance.
• 27C256: Older technology EPROM with similar capacity but requires UV light for erasing.

These alternative models offer different trade-offs in terms of speed, endurance, and compatibility with specific systems. The choice depends on the specific requirements of the application.

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