M27C1001-10B1

M27C1001-10B1 is a 1‑Mbit ultraviolet‑erasable EPROM. It stores firmware as 128K × 8 data with a parallel bus: 8 data lines (D0–D7) and 17 address lines (A0–A16). It operates from a 5V supply for normal reads; programming requires a higher programming voltage (VPP, typically around 12–13V) during a programming cycle. The device is non‑volatile and must be erased with UV light through the chip’s window before re‑programming. The “-10B1” suffix denotes a specific speed grade and package variant; exact timing (tAA) and package type (e.g., 28‑pin DIP or SOIC) should be checked in the datasheet. Common use cases include storing legacy firmware for microcontrollers or boot code in systems that rely on epoxy/UV‑erasable PROMs. Safety: handle with appropriate EPROM programmers and UV shielding.

Equivalents are other 28-pin, 1 Mbit EPROMs (128K × 8) with identical pinout and timing. Common cross-references: AM27C1001 (AMD), AT27C1001 (Atmel), F27C1001 (Fujitsu). ST’s M27C1001 family parts are interchangeable with those, if speed grade (-10) and package match. Always verify exact pinout and voltage in the datasheets; programming/erase methods may differ.

Concise features of M27C1001-10B1:
- 1 Mbit total capacity (128 Kbytes) organized as 128K × 8
- Parallel 8-bit data bus; 17 address lines (A0–A16)
- 28-pin package (DIP/SOIC)
- 5V supply (typical Vcc 4.5–5.5V)
- UV-erasable CMOS EPROM (reprogrammable after UV erase)
- Control inputs: CE, OE, WE
- Speed grade: -10B1 (typical access time ~120–150 ns, varies by lot)
- Pin-compatible with other 27C/27C1x devices for straightforward replacement
Note: Erasing requires UV exposure; programming done with an EPROM programmer.

- Manufacturer: STMicroelectronics (ST).
- What kind of company: A Franco-Italian multinational semiconductor and electronics company that designs, develops, and manufactures integrated circuits and related components.

Common application areas for the M27C1001-10B1 are:
- Embedded systems: firmware/storage for microcontrollers/CPUs (boot code and app logic)
- Automotive: ECUs, body/powertrain control modules
- Consumer electronics: set-top boxes, DVD/Blu-ray players, TVs, audio gear
- Industrial/instrumentation: PLCs, controllers, data loggers
- Networking/telecom: routers, modems, switches, embedded firmware
- Prototyping and legacy designs: ROM replacement and firmware development
Note: M27C1001 is a 1-Mbit parallel UV-EPROM used for non-volatile firmware storage.

28-pin DIP (PDIP) package.