AT27C020-90JU

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AT27C020-90JU

IC EPROM 2MBIT PARALLEL 32PLCC

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Spezifikationen

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/ROM memory from Atmel (now Microchip). It stores 2,097,152 bits organized as 256 K × 8 and is accessed via A0–A17 with an 8‑bit data I/O bus. It uses standard parallel EPROM control pins: Chip Enable (CS), Output Enable (/OE), and Write Enable (/WE). The “-90” indicates a 90 ns access time. Typical supply is 4.5–5.5 V; programming requires a higher program voltage (VPP ≈ 12.5 V). Erase method depends on variant (UV‑erasable or electrically erasable in some versions); check the datasheet for specifics. The “JU” suffix denotes package type (28‑pin) and related packaging/grade details.
Common uses: firmware storage in legacy microcontrollers, boot ROMs, BIOS-like code where random read access is needed. These devices have largely been superseded by flash memory. For exact electrical characteristics, programming sequences, and package options, consult the AT27C020‑90JU datasheet.

Features

Key features of AT27C020-90JU:
- Memory/organization: 2 Mbit UV-erasable PROM — 256K x 8 (D0–D7) with 18 address lines (A0–A17).
- Speed: 90 ns access time (speed grade -90).
- Power: 5V tolerant (Vcc 4.5–5.5V); programming uses Vpp = 12.5V.
- Control: CE (Chip Enable), OE (Output Enable), WE (Write Enable) for read/program modes.
- Packaging: 28-pin package; suffix -JU denotes a specific package type (ceramic DIP variant).
- Erase/Program: UV-erasable (requires UV light to erase); not erased/in-circuit during normal operation.
- Data retention and endurance: data retention >10 years; typical programming endurance ~1000 cycles.
- I/O: 8-bit data bus; 18-bit address bus for full 2Mbit space.
Note: For programming, a 12.5V Vpp is required; during normal reads, WE is inactive.

Package

28-pin Plastic DIP (DIP-28) package.

Pinout

- Pin count: 28 pins (DIP-28; packaging code JU denotes this plastic DIP package)
- Function: 2-Mbit UV-erasable PROM (EPROM) with an 8-bit data bus; organization typically 256K × 8, address lines A0–A17, and control signals CE, OE, WE; operates at 5V with 90 ns access time.

Manufacturer

- Manufacturer: Atmel Corporation.
- What kind of company: A semiconductor company that designs and manufactures memory and microcontroller integrated circuits (now part of Microchip Technology).

Application

AT27C020-90JU is a 2-Mbit parallel UV-erasable EPROM (27C020), 28-pin, with 90 ns access. Applications: firmware/boot code storage for microcontrollers/microprocessors; standalone ROM for embedded systems; firmware updates in consumer electronics, automotive modules, telecom and industrial controllers; instrumentation and test equipment; development prototypes and any system needing nonvolatile program memory.

Equivalent

AT27C020-90JU is a 2-Mbit (256K×8) 5V parallel EPROM in a 28-pin DIP. Equivalents include: AMD AM27C020; ST M27C020. Other vendors’ 2Mbit 28-pin 5V EPROMs with identical pinouts can be used; verify speed (-90) and packaging.

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