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AT27C256R-45PU

Name: AT27C256R-45PU
Rating: 4.7 (12 reviews)

IC EPROM 256KBIT PARALLEL 28DIP

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資料表 AT27C256R-45PU DataSheet
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規格

Part Status	Active
DigiKey Programmable	Verified
Memory Type	Non-Volatile
Memory Format	EPROM
Technology	EPROM - OTP
Memory Size	256Kbit
Memory Organization	32K x 8
Memory Interface	Parallel
Access Time	45 ns
Voltage - Supply	4.5V ~ 5.5V
Operating Temperature	-40°C ~ 85°C (TC)
Mounting Type	Through Hole
Package / Case	28-DIP (0.600", 15.24mm)
Supplier Device Package	28-PDIP
Base Product Number	AT27C256

概述

Description

The AT27C256R-45PU is a 32K x 8-bit (256Kbit) EPROM (Erasable Programmable Read-Only Memory) produced by Microchip Technology. It is designed for applications requiring non-volatile storage, allowing data to be retained even when the power is turned off. The "45" in the part number indicates a maximum access time of 450 ns, making it suitable for moderate-speed applications.
The device features an integrated circuit package with 28 pins, supporting both dual in-line and surface mount configurations. Programming is accomplished using a UV light source, allowing the chip to be erased and reprogrammed multiple times. It has a wide operating voltage range, typically between 4.5V to 5.5V, and it supports both byte and word programming modes.
Common applications include firmware storage, data logging, and other uses where data permanence is crucial. Its compatibility with standard EPROM programming equipment makes it a versatile choice for developers working on embedded systems and various electronic devices.

Features

The AT27C256R-45PU is a high-performance EEPROM (Electrically Erasable Programmable Read-Only Memory) chip with several key features:
1. Memory Size: 256 Kbits (32 KB) of memory organized as 32K x 8 bits.
2. Access Time: Fast access time of 45ns, making it suitable for various applications.
3. Programming Voltage: Operates at a programming voltage of 12.5V.
4. Data Retention: Offers long data retention of over 100 years.
5. Electrical Erasure: Supports electrical erasure, allowing for easy data reprogramming without the need for UV exposure.
6. Endurance: Capable of enduring up to 1,000,000 erase/write cycles.
7. Pin Configuration: Available in a 28-pin DIP or surface mount package for flexible design options.
8. Low Power Consumption: Operates with low power requirements, enhancing efficiency in battery-operated devices.
These features make the AT27C256R-45PU suitable for various embedded applications, including code storage and data retention in consumer electronics and industrial devices.

Package

The AT27C256R-45PU is packaged in a 28-pin dual in-line package (DIP) format.

Pinout

The AT27C256R-45PU is a 32K x 8-bit EEPROM that features a 28-pin Dual In-line Package (DIP) form factor. The pin functions are as follows:
1. A0-A14: Address inputs (15 address lines for 32K memory).
2. D0-D7: Data input/output (8 data lines).
3. VCC: Power supply (+5V).
4. GND: Ground.
5. CE: Chip Enable (activates the chip).
6. OE: Output Enable (controls output data).
7. WE: Write Enable (controls write operations).
8. NC: No Connect (not internally connected).
The device has a typical access time of 45 ns, hence the designation "45" in its part number. This EEPROM is used for non-volatile storage applications where data retention is critical.

Manufacturer

The AT27C256R-45PU is manufactured by Atmel Corporation, which is a semiconductor company known for developing microcontrollers, memory devices, and other integrated circuits. Atmel, founded in 1984, gained recognition for its EEPROM and flash memory products, as well as its AVR microcontroller line. In 2016, Atmel was acquired by Microchip Technology Inc., a leading provider of microcontroller, mixed-signal, analog, and Flash-IP solutions. Microchip continues to produce and support Atmel's legacy products, including the AT27C256R-45PU, which is a 32K (256Kbit) UV EPROM (Erasable Programmable Read-Only Memory).

Application

The AT27C256R-45PU is a 32K x 8-bit EEPROM primarily used in applications requiring non-volatile memory storage, such as microcontroller programming, firmware storage, and data retention in electronic devices. Its features make it suitable for consumer electronics, automotive systems, industrial automation, and telecommunications equipment. Additionally, it is utilized in data logging, configuration storage, and as part of embedded systems for storing preferences or settings.

Equivalent

The AT27C256R-45PU is a 32KB EEPROM chip. Equivalent products include:
1. M27C256 - Am27C256 from AMD
2. 27C256 - Various manufacturers like Microchip or ON Semiconductor
3. W27C256 - Winbond
4. HN27C256 - Hitachi
Always verify specific characteristics and pin configurations before substitution.