AT27C020-90JU

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AT27C020-90JU

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IC EPROM 2MBIT PARALLEL 32PLCC

  • HerstellerMikrochip-Technologie

  • Herstellerteil #AT27C020-90JU

  • Paket LCC-32

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Spezifikationen

Attribut Wert
Supplier Microchip Technology
Package Tube
ProductStatus Active
MemoryType Non-Volatile
MemoryFormat EPROM
Technology EPROM - OTP
MemorySize 2Mb (256K x 8)
MemoryInterface Parallel
AccessTime 90 ns
Voltage-Supply 4.5V ~ 5.5V
OperatingTemperature -40°C ~ 85°C (TC)
MountingType Surface Mount
Package/Case 32-LCC (J-Lead)

Übersicht

Description

AT27C020-90JU is a 2-megabit parallel EPROM from Atmel (now Microchip). Key points:
- Organization: 256K x 8 (8 data bits, 2 Mbit total)
- Package: 28-pin (JU variant)
- Speed: 90 ns access time
- Supply: 5V single-supply (typical 4.5–5.5V)
- Addresses: A0–A17; Data: DQ0–DQ7
- Controls: CE, OE, WE; VPP for programming (approx. 12.5V); UV-erasable
- Non-volatile: data retained without power; erasing requires UV exposure; programming uses VPP
- Use: firmware/BIOS storage and other fixed code in older systems
- Notes: slower/less dense than modern Flash; largely obsolete for new designs
Bottom line: a classic, UV-erasable, 2 Mb ROM with fast read via 90 ns, used for non-volatile code storage in vintage hardware.

Equivalent

Equivalents (2 Mbit, 28-pin EPROM, 90 ns) to AT27C020-90JU:
- AMD AM27C020-90
- ST/Micro M27C020-90
- Winbond W27C020-90
- Macronix MX27C020-90
- Fujitsu F27C020-90
- SST SST27C020-90
Note: verify exact package code (JU) and speed rating with the vendor cross-reference.

Features

AT27C020-90JU features (concise):
- 2 Mbit EPROM (256K × 8 organization)
- 90 ns access time (fast)
- 5V Vcc supply (typical 4.5–5.5V)
- 12.5V programming voltage (VPP) for programming
- UV-erasable, windowed EPROM (erase with UV light; re-program afterward)
- Random-access, asynchronous read; tri-state outputs
- Control pins: Chip Enable (CE), Output Enable (OE), Write Enable (WE)
- 28-pin DIP package; JU variant denotes package type
- Operating temperature: typically 0°C to 70°C (standard grade)

Pinout

- Pin count: 28 pins (DIP-28, and equivalent 28-pin packages)
- Function: 2-Mbit UV-erasable PROM (EPROM) with an 8-bit data bus. It uses A0–A17 (18 address lines), DQ0–DQ7 (data outputs), and control pins CE and OE, plus a programming voltage VPP. Powered by VCC and GND.

Manufacturer

Manufacturer: Atmel Corporation (the AT27C020-90JU is an Atmel EPROM).
What kind of company: A semiconductor company that designs and manufactures memory ICs and microcontrollers (embedded solutions). Atmel is now part of Microchip Technology.

Application

AT27C020-90JU is a 2-Mbit UV-erasable EPROM (256 KB) with 90 ns access in a 28-pin package. Common applications:
- Firmware storage for embedded systems
- Boot ROMs for microcontrollers
- BIOS/firmware ROMs on boards
- Automotive and industrial control equipment
- Consumer electronics, networking gear, printers, set-top boxes
- Development/reprogramming memory and fixed lookup tables
Notes: requires UV erasure before reprogramming; suitable where EPROM-style memory is desired over masking ROMs or flash.

Package

28-pin DIP (Plastic DIP) package.

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