사양
| 속성 | 가치 |
| 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) |
개요
Description
AT27C020-90PU is a 2‑Mbit UV‑erasable EPROM from Atmel (now Microchip). Key points:
- Organization: 256K × 8 (18 address lines A0–A17, 8 data I/Os)
- Speed: 90 ns access time (fast read)
- Package: 28‑pin Plastic DIP (PU)
- Supplies: Vcc ≈ 5 V; Vpp ≈ 12.5 V for programming; GND
- Controls: CE, OE for read; WE with Vpp for programming
- Erase: UV‑erasable (windowed) and non‑volatile; data retained without power
- Use: firmware/BIOS storage, microcontroller ROMs, embedded systems
- Pros/cons: Fast random access, durable non‑volatile storage, reprogrammable with an EPROM programmer; requires UV erasure and a dedicated programmer; not as convenient as in‑circuit EEPROM for frequent updates.
- Organization: 256K × 8 (18 address lines A0–A17, 8 data I/Os)
- Speed: 90 ns access time (fast read)
- Package: 28‑pin Plastic DIP (PU)
- Supplies: Vcc ≈ 5 V; Vpp ≈ 12.5 V for programming; GND
- Controls: CE, OE for read; WE with Vpp for programming
- Erase: UV‑erasable (windowed) and non‑volatile; data retained without power
- Use: firmware/BIOS storage, microcontroller ROMs, embedded systems
- Pros/cons: Fast random access, durable non‑volatile storage, reprogrammable with an EPROM programmer; requires UV erasure and a dedicated programmer; not as convenient as in‑circuit EEPROM for frequent updates.
Equivalent
AT27C020-90PU is a 2-Mbit (256K × 8) 28-pin UV-EPROM with 90 ns access.
Equivalents (2Mbit EPROM, DIP-28):
- AM27C020 (AMD)
- M27C020 (Mitsubishi/ST)
- D27C020 (NEC)
- MX27C020 (Macronix)
Note: verify exact speed grade and package to match.
Equivalents (2Mbit EPROM, DIP-28):
- AM27C020 (AMD)
- M27C020 (Mitsubishi/ST)
- D27C020 (NEC)
- MX27C020 (Macronix)
Note: verify exact speed grade and package to match.
Features
Key features of AT27C020-90PU:
- 2-Mbit UV-erasable PROM (256K x 8)
- 5V core operation; VPP programming voltage (typically 12.5V)
- 90 ns access time (the “-90” speed)
- 28-pin Plastic DIP package (PU)
- Pinout compatible with 27C020 family; CE and OE for read control; A0–A17 and D0–D7
- UV erase window for erasing contents with UV light
- Non-volatile storage with data retention after programming
- Widely used for firmware/code storage in DIP-era designs
Note: Programming requires VPP; normal reads use 5V. Not a rewrite-in-circuit device without UV erasure.
- 2-Mbit UV-erasable PROM (256K x 8)
- 5V core operation; VPP programming voltage (typically 12.5V)
- 90 ns access time (the “-90” speed)
- 28-pin Plastic DIP package (PU)
- Pinout compatible with 27C020 family; CE and OE for read control; A0–A17 and D0–D7
- UV erase window for erasing contents with UV light
- Non-volatile storage with data retention after programming
- Widely used for firmware/code storage in DIP-era designs
Note: Programming requires VPP; normal reads use 5V. Not a rewrite-in-circuit device without UV erasure.
Pinout
- Pin count: 28 pins (DIP, -PU packaging).
- Function: 2-Mbit ultraviolet-erasable PROM (EPROM) with 256K × 8 organization. It provides 18 address lines (A0–A17), 8 data I/O lines (DQ0–DQ7), and control inputs CE, OE, WE, plus Vcc and Gnd and a programming voltage Vpp (~12.5V). Speed grade: -90 (90 ns).
- Function: 2-Mbit ultraviolet-erasable PROM (EPROM) with 256K × 8 organization. It provides 18 address lines (A0–A17), 8 data I/O lines (DQ0–DQ7), and control inputs CE, OE, WE, plus Vcc and Gnd and a programming voltage Vpp (~12.5V). Speed grade: -90 (90 ns).
Manufacturer
- Manufacturer: Atmel Corporation (the AT27C020 device; Atmel is now part of Microchip Technology).
- What kind of company: A semiconductor company that designs and manufactures integrated circuits, including memory devices (EPROM/EEPROM/Flash) and microcontrollers.
- What kind of company: A semiconductor company that designs and manufactures integrated circuits, including memory devices (EPROM/EEPROM/Flash) and microcontrollers.
Application
AT27C020-90PU is a 2-Mbit UV-erasable PROM (EPROM) in a plastic DIP. Common applications:
- Firmware storage for microcontrollers/microprocessors in embedded systems (industrial controls, consumer electronics)
- Standalone program memory for development boards, evaluation kits, and test equipment
- Replacement/maintenance ROM for legacy equipment (PLCs, instrumentation, telecom, automotive prototyping)
- Education kits and vintage hardware restoration
- Firmware storage for microcontrollers/microprocessors in embedded systems (industrial controls, consumer electronics)
- Standalone program memory for development boards, evaluation kits, and test equipment
- Replacement/maintenance ROM for legacy equipment (PLCs, instrumentation, telecom, automotive prototyping)
- Education kits and vintage hardware restoration
Package
28-pin Plastic DIP (PDIP) package, through-hole. The -PU suffix denotes Plastic DIP packaging (0.3" wide in standard DIP-28 form).
