AT27C020-90PU

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AT27C020-90PU

IC EPROM 2MBIT PARALLEL 32DIP

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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 Through Hole
Package/Case 32-DIP (0.600, 15.24mm)

Übersicht

Description

AT27C020-90PU is a 2-Mbit ultraviolet-erasable PROM (EPROM) from Atmel (now Microchip). It stores 256 Kbytes of data as 256K × 8, addressed by 18 lines (A0–A17) with an 8-bit data bus (DQ0–DQ7).
Key specs:
- Access time: 90 ns
- Package: 28-pin Plastic DIP (PU)
- Supply: Vcc typically 5 V
- Programming: requires a higher VPP (about 12.5 V) during programming
- Erase: UV light exposure to erase all data
- Controls: Chip Enable (CE), Output Enable (OE), Write Enable (WE) for read/program
Notes:
- Read operations use CE and OE; programming uses WE with VPP
- Not a normal writable EEPROM—erase with UV light and reprogram with an EPROM programmer
- Common uses: firmware storage, BIOS/boot ROMs, embedded system code
If you need pinout or timing details, consult the AT27C020 datasheet.

Features

AT27C020-90PU is a 2-Mbit UV-erasable EPROM in a 28-pin plastic DIP (PU) with speed grade -90 (90 ns).
Key features:
- Capacity: 256K x 8 (2 Mbit)
- Windowed UV erase: erase with ultraviolet light
- Package: 28-pin plastic DIP (PU)
- Supply: 5V single-supply operation
- Programming voltage: VPP ≈ 12.5V
- Speed: access time of 90 ns
- Organization: 18 address lines (A0–A17), 8 data I/O lines (D0–D7)
- Control: chip enables (CE) and output enable (OE); programming requires VPP and proper programming signals
- Compatibility: standard 27C020-family interface for easy replacement
Note: During normal read operations, device uses CE and OE; programming requires VPP and programming inputs.

Package

Plastic DIP, 28-pin package (PDIP). The suffix “-PU” indicates a plastic DIP package.

Pinout

- Pin count: 28 pins (Plastic DIP, PU package)
- Function: 2 Mbit parallel EPROM (256K × 8). Uses address inputs A0–A17, data outputs DQ0–DQ7, and control pins CE, OE, WE; power pins Vcc and Vss, plus Vpp for programming. Speed grade: 90 ns.

Manufacturer

Manufacturer: Atmel Corporation (ATmel), now part of Microchip Technology.
About the company: Atmel was a semiconductor company that designed and manufactured memory devices (including EEPROM/EPROM) and microcontrollers; it is now integrated into Microchip Technology.

Application

AT27C020-90PU is a 2‑Mbit UV-erasable parallel EPROM. Typical applications:
- Non-volatile firmware/program memory for embedded systems and microcontrollers
- Firmware storage in consumer electronics (printers, set‑top boxes, VCRs, TVs)
- Development/prototyping (replacement for mask ROM)
- Industrial automation and control equipment
- Legacy automotive ECUs
- Any use requiring UV-erasable 2‑Mbit PROM memory

Equivalent

Drop-in equivalents (2-Mbit, 28-pin DIP UV-EPROM with the same pinout) include:
- AMD AM27C020-90PC
- STMicroelectronics M27C020-90
- Macronix MX27C020-90
Note: verify exact suffix, timing (ns), and UV-erasable vs CMOS variants before substitution.

Versand

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