AT28HC256-70PC

Series:	--
Packaging:	Tube
Part Status:	Obsolete
Memory Type:	Non-Volatile
Memory Format:	EEPROM
Technology:	EEPROM
Memory Size:	256Kb (32K x 8)
Write Cycle Time - Word, Page:	10ms
Access Time:	70ns
Memory Interface:	Parallel
Voltage - Supply:	4.5 V ~ 5.5 V
Operating Temperature:	0°C ~ 70°C (TC)
Mounting Type:	Through Hole
Package / Case:	28-DIP (0.600", 15.24mm)
Supplier Device Package:	28-PDIP
Base Part Number:	AT28HC256

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Introduction

AT28HC256-70PC is an integrated memory device that is used for storing and retrieving data in electronic systems. The device is based on an 8-bit non-volatile SRAM (static random-access memory) that has an architecture of 256K words (1024K-bits) of storage capacity. It utilizes a low-power CMOS process to reduce power consumption while featuring a very low pin-count, high speed and outstanding performance. The AT28HC256-70PC is a popular choice for embedded data storage in various applications.

Common applications

AT28HC256-70PC is commonly used in embedded systems in order to provide reliable, non-volatile storage. Common applications include smart cards, portable medical instruments, connected medical devices, industrial control and automation systems, industrial controllers, data acquisition systems, automotive systems, security systems and point-of-sale (POS) systems. Additionally, the AT28HC256-70PC is often used for gaming machines, mobile phones, PDAs and PDAs (Personal Digital Assistants).

Main features

The AT28HC256-70PC features a variety of features that make it a useful device for embedded systems. It has a low pin-count, high speed, low power consumption and 2500 kV static RAM endurance values per block, making it an ideal choice for applications that require long-term data storage. The device also offers a number of security features, such as a password protection, data-error repair, ECC (Error Correction Code) and an internal GSR (Global Security Register).

Working Principle

The working principle of the AT28HC256-70PC is based on a static RAM (SRAM) architecture. SRAM operates by storing each bit of data in a memory cell, which is comprised of one or more transistors and access transistors. This type of memory is very fast and is used extensively in modern electronics. When a bit of data is read or written to the AT28HC256-70PC, the memory cell is precharged and then either driven to the Vcc voltage level or discharged. Depending on the value of the data bit, the memory cell will either be discharged or driven. Driving the cell produces a “1”, while discharging the cell produces a “0”. The AT28HC256-70PC also features an internal write-protection register. When enabled, this register prevents the SRAM from being written over or modified by external sources. The protection is activated upon entering a specific code into the register, providing further security to the memory device.

Conclusion

The AT28HC256-70PC is a popular choice for embedded systems, offering a variety of features such as low-power consumption, low-pin-count, high-speed and 2500 kV endurance values per block. It utilizes a static RAM architecture to store and access data and also provides an internal write-protection register for added security. The AT28HC256-70PC is an ideal choice for applications that require reliable, non-volatile data storage.

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