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AT27C512R-45JU

Name: AT27C512R-45JU
Rating: 4.7 (12 reviews)

IC EPROM 512KBIT PARALLEL 32PLCC

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製造商。部分 #AT27C512R-45JU
包 32-LCC (J-Lead)
資料表 AT27C512R-45JU DataSheet
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規格

Supplier	Microchip Technology
Package	Tube
ProductStatus	Active
MemoryType	Non-Volatile
MemoryFormat	EPROM
Technology	EPROM - OTP
MemorySize	512Kb (64K x 8)
MemoryInterface	Parallel
AccessTime	45 ns
Voltage-Supply	4.5V ~ 5.5V
OperatingTemperature	-40°C ~ 85°C (TC)
MountingType	Surface Mount
Package/Case	32-LCC (J-Lead)

概述

Description

AT27C512R-45JU is a 512 kbit UV-erasable PROM (EPROM) from Atmel (now Microchip). Key points:
- Organization: 64K × 8 (64K addresses, 8 data bits)
- Access time: 45 ns (the “-45”)
- Interface: Parallel, with A0–A15, DQ0–DQ7, and control pins CE/CS, OE, WE
- Power: Vcc = 5V; programming voltage Vpp ≈ 12.5V
- Erase/Program: UV-erasable (requires UV light to erase); reprogrammable after erasure
- Package: 28-pin (the “JU” suffix denotes a specific package/lead style in Atmel naming)
- Use cases: Firmware/BIOS storage and other legacy microcontroller systems
- Notes: Not a modern flash; needs an EPROM programmer for initial programming and a UV lamp for erasure; handle Vpp carefully during operation
In short: a 64K×8 UV-EPROM with 45 ns access, 5V logic, 12.5V programming, used for parallel-address firmware storage in older systems.

Features

Here are the typical features of AT27C512R-45JU:
- 512 Kbit EPROM: 64K x 8 organization
- 5V single-supply operation; Vpp programming voltage ~12.5V
- 45 ns read access time
- 28-pin DIP (JU) package; windowed UV-erasable device
- Address/data interface: A0–A15, DQ0–DQ7; CE and OE pins
- UV erase via exposure to UV light; requires dedicated programming
- Endurance: ~100,000 program/erase cycles; Data retention ~25 years
- Operating temperature: typically -40°C to +85°C (industrial grade variant)

Package

28-pin DIP package (Plastic DIP).

Pinout

- Pin count: 28 pins (DIP-28 or SO-28).
- Function: 512-kbit CMOS EPROM (64K × 8) memory. Provides a parallel 8-bit data bus, addressed by A0–A15, with control signals CE and OE (and programming voltage Vpp for programming). Used as non-volatile read-only memory for storing program/data.

Manufacturer

Manufacturer: Atmel Corporation (now part of Microchip Technology).
What kind of company: A semiconductor company that designs and manufactures nonvolatile memory ICs (EPROMs, flash, etc.) and microcontrollers for embedded applications. Atmel was acquired by Microchip Technology in 2016.

Application

Application areas: Non-volatile ROM for embedded systems. Storing firmware/boot code for microcontrollers, PLCs, printers, set-top boxes, and other consumer electronics. Data tables, lookup tables, fonts, and constants in ROM-based designs. Prototyping and off-line reprogramming (EPROMs are UV-erasable and require a programmer).

Equivalent

Equivalents are other 28-pin 512Kbit (64K x 8) 5V EPROMs with 45 ns speed. Examples:
- AMD AM27C512-45
- Intel 27C512-45
- ST M27C512-45
- Macronix MX27C512-45
- Winbond W27C512-45
Note: verify package/pinout and supply voltage for your board.