27C512-10 - 512Kbit (64Kx8) 100ns CMOS EPROM | Texas Instruments
MPN： 27C512-10 ✗ 停產27C512-10 概覽
An EPROM (Erasable Programmable Read-Only Memory) is a non-volatile semiconductor memory that retains programmed data without power. In the broader memory hierarchy, it sits within read-only memory (ROM) devices, under the memory IC category, alongside EEPROM and Flash. OTP EPROMs cannot be electrically erased; the 27C512-10 is programmed once via a +12.5V programming voltage and permanently retains its contents, which historically made it the standard firmware-storage device for embedded systems.
Key features of the 27C512-10 include a single +5V power supply with a standard +/-10% tolerance, fast 100 ns access time in the -10 speed grade (the Macronix and TI families also offered 45/55/70/90/120/150 ns options), completely static operation requiring no clocks or refresh, and full TTL input/output compatibility. Typical CMOS standby current is around 20 uA (per the ST 27C512 family data), keeping power consumption low in battery-backed or low-duty-cycle systems.
Architecturally, the device is organized as 65,536 words of 8 bits, addressed by 15 address lines (A0-A14) with 8 bidirectional tri-state data lines (Q0-Q7). Chip enable (/E) and output enable (/G) controls provide simple bus interfacing, and the JEDEC-approved 28-pin pinout ensures cross-vendor socket compatibility with parts such as the ST M27C512, Macronix MX27C512, and Winbond W27C512.
Typical applications include firmware and BIOS storage in embedded controllers, retrocomputing and arcade board repairs, automotive engine-control ROMs (SST 27SF512 variants are still used as 27C512 drop-ins in ECM tuning), industrial equipment upgrades, and educational breadboard computer projects. The 100 ns access time supports zero-wait-state operation on many 8-bit and 16-bit microprocessor buses.
A key design consideration: programming requires VPP of +12.5V per the datasheet, and OTP parts cannot be erased - verify firmware thoroughly on a windowed UV-erase sample or use an EEPROM/Flash drop-in (such as the Winbond W27C512) during development.
This page synthesizes distributor pricing context, drop-in alternatives, pinout data, and practical design notes for an otherwise hard-to-source obsolete part - information not consolidated in any single manufacturer datasheet.
直接替換替代品，適用於 27C512-10 — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： 27C512-10 （相同外形與佔位） — 差異在於 Package, Memory Type, Erase Method, Organization, Memory Size.
27C512-15FA
✅ 直接替換聯絡詢價
查看資料表 →27C512-20
✅ 直接替換聯絡詢價
查看資料表 →27C512-25-X
✅ 直接替換聯絡詢價
查看資料表 →M27C512-10F1
✅ 直接替換📋 參考替代品（不在目錄中）
MX27C512-10
✅ 直接替換📋 參考替代品（不在目錄中）
W27C512-70
✅ 直接替換📋 參考替代品（不在目錄中）
SST27SF512
✅ 直接替換📋 參考替代品（不在目錄中）
27C512-10 最大額定值與電氣特性
| 記憶體容量 | 512 Kbit |
| 組織 | 64K x 8 |
| 記憶體類型 | OTP EPROM (CMOS) |
| Access Time (Speed Grade -10) | 100 ns |
| Supply Voltage (VCC) | +5 V with +/-10% tolerance |
| Programming Voltage (VPP) | +12.5 V |
| Standby Current | 20 uA typical (CMOS standby) |
| Operating Mode | Totally static operation |
| 介面 | Parallel, TTL compatible |
| Address Lines | 15 (A0-A14) |
| Data Lines | 8 (Q0-Q7), tri-state outputs |
| Control Signals | /E (chip enable), /G (output enable) |
| Pinout Standard | JEDEC-approved 28-pin EPROM pinout |
| 封裝 | 28-pin DIP |
| 安裝類型 | Through Hole |
| Erase Method | One-Time Programmable (not erasable) |
| RoHS 狀態 | unknown |
27C512-10 腳位配置
| 腳位 1 | A15/VPP — Address line 15 / programming voltage (+12.5V) during programming |
| 腳位 2 | A12 — Address input |
| 腳位 3 | A7 — Address input |
| 腳位 4 | A6 — Address input |
| 腳位 5 | A5 — Address input |
| 腳位 6 | A4 — Address input |
| 腳位 7 | A3 — Address input |
| 腳位 8 | A2 — Address input |
| 腳位 9 | A1 — Address input |
| 腳位 10 | A0 — Address input |
| 腳位 11 | Q0 — Data output, tri-state |
| 腳位 12 | Q1 — Data output, tri-state |
| 腳位 13 | Q2 — Data output, tri-state |
| 腳位 14 | GND — Ground |
| 腳位 15 | Q3 — Data output, tri-state |
| 腳位 16 | Q4 — Data output, tri-state |
| 腳位 17 | Q5 — Data output, tri-state |
| 腳位 18 | Q6 — Data output, tri-state |
| 腳位 19 | Q7 — Data output, tri-state |
| 腳位 20 | /E — Chip enable (active low) |
| 腳位 21 | A10 — Address input |
| 腳位 22 | /G — Output enable (active low) |
| 腳位 23 | A11 — Address input |
| 腳位 24 | A9 — Address input (A9/VPP function during programming per JEDEC 28-pin EPROM convention) |
| 腳位 25 | A8 — Address input |
| 腳位 26 | A13 — Address input |
| 腳位 27 | A14 — Address input |
| 腳位 28 | VCC — +5V power supply |
典型應用
27C512-10 適用於 6 應用s: Embedded Firmware Storage, Retrocomputing and Arcade Board Repair, Automotive ECM Chip Tuning, Industrial Equipment Service and Upgrades, Character Generators and Lookup Tables, Educational Breadboard Computers.
Embedded Firmware Storage
The 27C512-10 stores boot firmware and application code in embedded microprocessor systems. Its 64Kx8 organization matches the 64 KB address windows of classic 8-bit CPUs such as the Z80, 6502, and 8051 families, while the 100 ns access time supports zero-wait-state operation on 8-16 MHz buses. Because it is OTP, code is immutable in the field, which suits safety-relevant or tamper-sensitive firmware. Designers place it directly on the CPU data/address bus using the /E and /G controls for chip select and read gating, with ~20 uA standby current keeping idle power low in battery-backed controllers.
推薦
Retrocomputing and Arcade Board Repair
Vintage computers, game consoles, and arcade PCBs from the 1980s-90s commonly use 27C512 sockets for game ROMs and BIOS images. The JEDEC 28-pin pinout of the 27C512-10 matches these sockets exactly, and the 100 ns speed comfortably covers the access requirements of original 68000 and Z80 based hardware. Repair technicians dump the original ROM image, verify it, and burn a replacement onto a fresh OTP chip or a W27C512/SST27SF512 EEPROM drop-in when iterative testing is needed. Using genuine-speed parts avoids subtle timing failures such as corrupted graphics or boot hangs in marginal sockets.
推薦
Automotive ECM Chip Tuning
OBD-I era engine control modules (notably GM applications) use a 27C512-compatible socket for the calibration (fuel/spark map) chip. The SST27SF512 became the de facto tuning chip because it fits the same DIP-28 footprint yet can be re-programmed for each tuning iteration, whereas a genuine 27C512-10 is single-use. When installing a 27C512-10, the tuner must set the correct start-of-device address (e.g., 8000 hex for a 27C256 image, C000 hex for 27C128) and program the +12.5V VPP algorithm correctly. The 100 ns grade is a safe choice for stock ECM clock speeds.
推薦
Industrial Equipment Service and Upgrades
Legacy PLCs, CNC controllers, test instruments, and motor drives frequently carry 27C512 firmware chips. When a control board fails or a firmware patch must be applied, the OTP 27C512-10 lets service engineers burn the exact validated image with no risk of accidental erasure in the field - a property maintenance teams value over Flash. The 5V-only supply and TTL-compatible parallel interface integrate directly into 1980s-90s logic (74-series buses) without level shifting, and the totally static operation adds no timing complexity. Keeping OTP stock on hand shortens MTTR for boards that original vendors no longer support.
推薦
Character Generators and Lookup Tables
Beyond code storage, EPROMs excel as hardware lookup tables: video character generators, sine/cosine tables for DDS, CRC/generation-polyline tables, and keyboard-decoder matrices. The 27C512-10 provides 65,536 addressable bytes, letting designers map a 15-bit input vector to an 8-bit output in a single 100 ns access - effectively a combinational function of 15 inputs realized in one chip. Address lines A0-A14 receive the input vector while /G gates the tri-state outputs onto the data bus. Because content is fixed at programming time, the lookup behavior is deterministic and immune to bit-rot from power cycling.
推薦
Educational Breadboard Computers
Hobbyist and university builds such as 6502/Z80 breadboard microcomputer courses use the 27C512 to hold monitor firmware and test programs. The community consensus (e.g., Ben Eater-style projects) is that larger 27C512 chips are often cheaper and more available than smaller 27C256/27C128 parts; designers simply map or tie the highest address lines and adjust the start-of-device address in the programmer. The 100 ns -10 grade eliminates wait-state concerns on slow educational clock rates, and the through-hole DIP-28 package is breadboard-friendly. TL866-class USB programmers handle the +12.5V programming algorithm directly.
推薦
推薦產品摘要
工程參考資料，適用於 27C512-10 — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | 27C512-15FA | M27C512-10F1 | MX27C512-10 | W27C512-70 | SST27SF512 |
|---|---|---|---|---|---|---|
| Package | 28-pin DIP | 28-pin DIP - same | 28-CDIP windowed - same JEDEC footprint | 28-pin DIP - same | 28-pin DIP - same | 28-pin DIP - same |
| Brand | Texas Instruments | Texas Instruments | STMicroelectronics | Macronix | Winbond | Microchip Technology |
| Access Time | 100 ns | 150 ns | 100 ns | 100 ns | 70 ns | 70 ns |
| Memory Technology | OTP EPROM (CMOS) | OTP EPROM | UV EPROM (windowed, erasable) | OTP EPROM | EEPROM (electrically erasable) | Flash |
| Organization | 64K x 8 (512 Kbit) | 64K x 8 | 64K x 8 | 64K x 8 | 64K x 8 | 64K x 8 |
| Supply Voltage | +5V +/-10% | +5V +/-10% | +5V | +5V (5V-only) | +5V | +5V |
| Re-programmable | No (OTP) | No (OTP) | Yes (UV erase) | No (OTP) | Yes (electrical erase) | Yes (electrical erase) |
主要差異化特點
- Fast 100 ns access time (對比27C512-15FA)
- Data immutability (OTP) (對比W27C512-70)
- CMOS low standby power (對比M27C512-10F1)
- Re-programmability trade-off (對比SST27SF512)
設計說明
The 27C512-10 is one-time programmable - there is no undo. Always validate the firmware image and the programming algorithm (including the +12.5V VPP level and timing) on a UV-erasable M27C512-10F1 or an electrically erasable W27C512 development chip before burning OTP units for production. Note also that pin 24 (A9) serves double duty during programming on this JEDEC pinout; a programmer configured for the wrong family can apply VPP to the wrong pin and destroy the device.
Verify bus timing margin against the actual -10 datasheet AC parameters before assuming zero-wait-state operation: 100 ns access time plus address-valid-to-setup, /E and /G propagation delays, and output-float times must fit inside your CPU read cycle. For 12-16 MHz 8-bit designs, 100 ns typically fits; for faster buses or heavily loaded address lines (large capacitance from multiple memory chips), add a wait state or move to a faster grade. Decouple VCC with 0.1 uF ceramic close to the socket, since CMOS EPROMs draw transient current on each output transition.
When laying out a universal EPROM socket (27C256/27C512/27C010), route the highest address pins and VPP-capable pins (pin 1, pin 24, pin 28 area) to jumper-selectable nets so the same PCB accepts multiple densities. Tie unused 27C512 address lines (A15 on pin 1 when emulating a 27C256 image) low or to a selector. Keep address/data traces short and roughly equal length for clean timing; the through-hole DIP-28 also allows a ZIF socket for development benches, which avoids socket-wear on production boards.
合規資訊
Part predates RoHS (2006); original production almost certainly used leaded solder. No compliance statements found in provided data.
