27C512-20 - 512Kbit EPROM 200ns CMOS 64Kx8 | Fujitsu
Артикул: 27C512-20 ✗ Снят с производства| Кол-во | Цена за ед. | Итого |
|---|---|---|
| 1 | $6.5 | $6,50 |
| 10 | $5.85 | $58,50 |
| 100 | $5.2 | $520,00 |
| 500 | $4.68 | $2.340,00 |
| 1.000 | $4.1 | $4.100,00 |
27C512-20 Обзор
An EPROM (Erasable Programmable Read-Only Memory) is a non-volatile semiconductor memory that retains programmed data permanently until erased by ultraviolet light through a quartz window. Within the memory hierarchy, EPROM sits alongside OTP ROM and mask ROM as firmware storage, preceding modern Flash devices. The 27C512 family is the 512 Kbit member of the industry-standard 27xx series, organized as 64K addresses of 8 bits each.
Key features of the 27C512-20 include the 200 ns address access time, low CMOS power consumption in standby mode, asynchronous operation requiring no clock, and a JEDEC-standard pinout shared across the 27C512 family from multiple manufacturers. The 3-state outputs allow direct bus connection with other memory or peripheral devices on a shared data bus.
The CMOS process keeps active and standby currents low compared with bipolar NMOS predecessors, which matters in battery-backed and embedded controller systems. The ceramic LCC package with UV-erase window allows repeated reprogramming during development, unlike OTP variants, though programming voltage and algorithm must follow the manufacturer datasheet.
Typical applications include legacy embedded controller firmware storage, industrial equipment BIOS and boot code, arcade and retro-computing game cartridges, and telecom line-card configuration memory where 5V-only, JEDEC-pinout non-volatile storage is required.
Designers should verify program voltage (VPP) requirements and programming pulse timing before inserting the device into a programmer, as programming algorithms differ between CMOS EPROM families even when the read-mode pinout is identical.
This page synthesizes cross-reference data, drop-in alternatives from multiple manufacturers, and practical design notes not consolidated in any single manufacturer datasheet.
Аналоги без доработки для 27C512-20 — тот же корпус, pin-to-pin совместимость. Компоненты в других корпусах, требующие переработки PCB, исключены.
Варианты в этой серии
Модели той же серии, совместимые без доработки с 27C512-20 (тот же форм-фактор и посадочное место) — отличается по Memory Type, Package, Organization, Access Time, Erase Method.
Инструмент быстрого сравнения — выберите альтернативные компоненты для сравнения бок о бок:
M27C512-20XF1
✅ Прямая замена📋 Справочный аналог (нет в каталоге)
AT27C512R-70PU
✅ Прямая замена📋 Справочный аналог (нет в каталоге)
TC57512AD
✅ Прямая замена📋 Справочный аналог (нет в каталоге)
M5M27C512AK
✅ Прямая замена📋 Справочный аналог (нет в каталоге)
W27C512-45
✅ Прямая замена📋 Справочный аналог (нет в каталоге)
GLS27SF512
✅ Прямая замена📋 Справочный аналог (нет в каталоге)
27C512-20/K
✅ Прямая замена📋 Справочный аналог (нет в каталоге)
27C512-20 Максимальные параметры и электрические характеристики
| Тип памяти | UV EPROM |
| Technology | CMOS |
| Density | 512 Kbit (524,288 bits) |
| Организация памяти | 64K x 8 |
| Maximum Access Time | 200 ns |
| Supply Voltage (VCC) | 5 V |
| Outputs | 3-state |
| Operation | Asynchronous |
| Корпус | CQCC32 / LCC32 (ceramic, UV window) |
| Тип монтажа | Surface Mount |
| Erase Method | Ultraviolet light |
| Интерфейс | Parallel |
| Word Size | 8 bit |
| Address Count | 65,536 words |
Конфигурация выводов 27C512-20
| Контакт 1 | A15 — Address input bit 15 |
| Контакт 2 | A12 — Address input bit 12 |
| Контакт 3 | A7 — Address input bit 7 |
| Контакт 4 | A6 — Address input bit 6 |
| Контакт 5 | A5 — Address input bit 5 |
| Контакт 6 | A4 — Address input bit 4 |
| Контакт 7 | A3 — Address input bit 3 |
| Контакт 8 | A2 — Address input bit 2 |
| Контакт 9 | A1 — Address input bit 1 |
| Контакт 10 | A0 — Address input bit 0 |
| Контакт 11 | Q0 — Data output bit 0 (3-state) |
| Контакт 12 | Q1 — Data output bit 1 (3-state) |
| Контакт 13 | Q2 — Data output bit 2 (3-state) |
| Контакт 14 | GND — Ground |
| Контакт 15 | Q3 — Data output bit 3 (3-state) |
| Контакт 16 | Q4 — Data output bit 4 (3-state) |
| Контакт 17 | Q5 — Data output bit 5 (3-state) |
| Контакт 18 | Q6 — Data output bit 6 (3-state) |
| Контакт 19 | Q7 — Data output bit 7 (3-state) |
| Контакт 20 | /E — Chip enable (active low) |
| Контакт 21 | A10 — Address input bit 10 |
| Контакт 22 | /OE/VPP — Output enable (active low) / programming voltage |
| Контакт 23 | A11 — Address input bit 11 |
| Контакт 24 | A9 — Address input bit 9 |
| Контакт 25 | A8 — Address input bit 8 |
| Контакт 26 | A13 — Address input bit 13 |
| Контакт 27 | A14 — Address input bit 14 |
| Контакт 28 | NC — Not connected (per JEDEC 27C512 PLCC32 layout) |
| Контакт 29 | NC — Not connected |
| Контакт 30 | NC — Not connected |
| Контакт 31 | NC — Not connected |
| Контакт 32 | VCC — Power supply, 5 V |
Типичное применение
27C512-20 подходит для 6 применениеs: Legacy Embedded Controller Firmware, Arcade Game and Retro-Computing Cartridges, Industrial Equipment BIOS and Boot Code, Development and Prototype Firmware Storage, Telecom and Network Card Configuration Memory, Automotive and Test Equipment Firmware.
Legacy Embedded Controller Firmware
The 27C512-20 stores boot and application firmware in 8-bit microcontroller systems built around 5V buses, where its 64K x 8 organization maps directly to a full 64 KB code space and the 200 ns access time meets classic 5-8 MHz CPU timing without wait states. Plugged into the JEDEC 27C512 socket with /CE tied to address decode and /OE to the CPU read strobe, the device provides deterministic, unalterable code storage. The UV window allows field revision during development, and CMOS standby current keeps idle system power low. Modern maintenance of such systems typically uses faster EPROM or Flash substitutes, but original-grade silicon preserves authentic timing margins.
Рекомендуется
Arcade Game and Retro-Computing Cartridges
Arcade PCBs and vintage home computers of the 1980s-90s use 27C512 sockets for game code and character ROMs. The 27C512-20's 64K x 8 capacity and 5V parallel interface match these boards exactly, and its ceramic LCC32 package suits surface-mounted or socketed cartridge positions. According to the eharmon EPROM cross-reference, hobbyists commonly mix original EPROMs with W27C512 EEPROM or GLS27SF512 Flash substitutes in these sockets for easier reprogramming during multi-game mod kits. When restoring to factory condition, the -20 grade's 200 ns speed matches original timing on 12 MHz-class 68000 and Z80 buses without introducing wait-state or bus-contention issues.
Рекомендуется
Industrial Equipment BIOS and Boot Code
PLC controllers, CNC machines, medical devices, and telecom line cards of that era store BIOS, monitor, and diagnostic code in 27C512 sockets. The 27C512-20's non-volatile CMOS EPROM retains code through power cycles and decades of storage, with 3-state outputs permitting multiple memories on a shared 8-bit bus via /CE address decoding. Its 200 ns access time is conservative but adequate for the 4-8 MHz processor clocks typical of such equipment. Because the part is obsolete, service organizations qualifying replacements should verify M27C512 or AT27C512R pin-to-pin equivalence and confirm programming-voltage compatibility of their EPROM programmers before swapping devices.
Рекомендуется
Development and Prototype Firmware Storage
The ceramic package's ultraviolet window makes the 27C512-20 suitable for iterative firmware development: code is erased with a UV lamp in minutes and reprogrammed, unlike OTP variants which are single-use. The JEDEC pinout lets the same target board accept development EPROMs and production OTP or Flash devices interchangeably. The 200 ns grade supports conventional microprocessor buses of legacy designs, while the single 5V read supply simplifies bench setups - only programming equipment needs the higher VPP. Engineers should verify their programmer supports the CMOS 27C512 algorithm, since NMOS-era algorithms can overstress CMOS dies during programming pulses.
Рекомендуется
Telecom and Network Card Configuration Memory
Line cards, modems, and network interface boards from the late 1980s and 1990s use 27C512 devices for configuration tables, DSP boot code, and protocol firmware. The 27C512-20's 64K x 8 parallel organization, 5V-only read operation, and 3-state bus outputs integrate directly into these card designs, with the ceramic LCC32 providing a durable, socketed surface-mount option. The 200 ns access time comfortably serves the slower bus cycles of these subsystems. For telephony equipment still in service, replacement strategy matters: ST M27C512 and Microchip AT27C512R remain the lowest-risk drop-ins, while Flash substitutes enable field updates without desoldering.
Рекомендуется
Automotive and Test Equipment Firmware
Engine control units, diagnostic testers, and bench instruments of the EPROM era hold calibration tables and firmware in 27C512 sockets. The 27C512-20's absolute non-volatility, 5V CMOS read interface, and wide availability during that period made it a default choice, and its 64K x 8 capacity matches the memory map window allocated in typical 8/16-bit controllers. The 200 ns access time suits the modest clock rates of these ECUs and testers. Tune shops modifying such ECUs today commonly install socketed EPROMs or Flash replacements (SST27SF512, W27C512) for repeatable reprogramming of calibration maps during iterative testing.
Рекомендуется
Сводка рекомендуемых товаров
Справочные инженерные данные для 27C512-20 — сравнение, рекомендации по проектированию и информация о соответствии.
Руководство по выбору
Сравнение с аналогами
| Параметр | Этот товар | M27C512-20XF1 | AT27C512R-70PU | W27C512-45 | GLS27SF512 |
|---|---|---|---|---|---|
| Package | CQCC32 / LCC32 (ceramic) | PLCC32 - same footprint | DIP28 / PLCC32 family | DIP28 / PLCC32 | DIP28 / PLCC32 |
| Brand | Fujitsu | STMicroelectronics | Microchip Technology | Winbond | Greenliant |
| Organization | 64K x 8 | 64K x 8 | 64K x 8 | 64K x 8 | 64K x 8 |
| Max Access Time | 200 ns | 200 ns | 70 ns (faster) | 45-120 ns (faster) | 70 ns (faster) |
| Supply Voltage | 5 V | 5 V | 5 V read | 5 V read | 5 V read |
| Erase Method | UV (ceramic window) | UV or OTP variant | OTP (PU) / UV window variants | Electrical (EEPROM) | Electrical (Flash) |
| Lifecycle Status | Obsolete | Active / mature | Active | Legacy / surplus | Active |
| In-System Reprogrammable | No (UV lamp required) | No (UV lamp required) | No (OTP/UV only) | Yes (electrical) | Yes (electrical/Flash) |
Ключевые отличия
- Authentic Fujitsu silicon for restoration-grade repairs (против M27C512-20XF1)
- UV-erasable ceramic window allows repeated reuse (против AT27C512R-70PU)
- Slower 200 ns grade limits use on fast buses (против W27C512-45)
Заметки по проектированию
Verify the programmer algorithm before programming. CMOS 27C512 devices require different VPP levels and pulse widths than NMOS 27xx EPROMs; using an NMOS algorithm can overstress the CMOS die. Confirm the exact suffix (-20, -20/L, -20/J, -20/K) package and speed options against the Fujitsu datasheet before creating a programming file, and never erase/program the original device in valuable vintage boards - program a known replacement instead, as recommended by EPROM repair guides.
When substituting a faster device (AT27C512R at 45-70 ns, W27C512 at 45 ns) into a board designed for the 200 ns 27C512-20, bus timing generally improves, but check output-enable and chip-enable access timing against the host CPU strobes. On boards with slow address decoding or wait-state logic tuned for 200 ns, faster devices are safe; the reverse substitution (slower in place of fast) requires wait states and is the usual failure mode.
The ceramic LCC32/PLCC32 footprint differs mechanically from DIP28: confirm your board uses the 32-pad PLCC/LCC land pattern with pin 1 at the notched corner matching the JEDEC orientation. For socketed retro-computing applications, use a quality machined-pin PLCC socket to avoid contact-resistance drift. Decouple VCC (pin 32) to GND (pin 14) with a 0.1 uF ceramic capacitor placed within a few millimeters of the package.
Информация о соответствии
Part predates RoHS/REACH (obsolete ceramic-package EPROM); no published compliance data found in provided sources.
