BLASI – IC 27C256-90F6 erasable DIL
BLASI – IC 27C256‑90F6 erasable DIL is a 256‑Kbit (32 KB) ultraviolet‑erasable programmable read‑only memory (EPROM) in a 28‑pin Dual In‑Line (DIP) package, used by BLASI to store firmware or configuration data for certain controllers or modules. The “erasable DIL” refers to the windowed ceramic or plastic DIP package that allows the chip to be wiped with UV light and then reprogrammed for different BLASI firmware versions or parameter sets. It operates at 5 V, has a 90 ns access time, and is typically mounted on the main BLASI PCB where older microcontroller‑based logic or boot code is stored.
Product Details
The BLASI‑labeled IC 27C256‑90F6 follows the standard 27C256 EPROM architecture: 32,768 addresses by 8 bits, giving 256 Kbit of non‑volatile memory, organized as a byte‑wide PROM for an 8‑bit or 16‑bit BLASI‑type microcontroller or older SAIA‑style processor. The 90F6 suffix indicates a 90 ns access speed variant, which is fast enough for real‑time BLASI control logic, timing sequences, and safety interlocks stored in the chip. The DIL “windowed” ceramic or plastic package exposes the die to short‑wave UV light, allowing a BLASI‑type EPROM eraser to clear the entire contents so the chip can be reused with updated firmware or different parameter sets.
In BLASI panels this erasable DIL EPROM is usually socketed on the main BLASI control board, so it can be removed and replaced without soldering. That makes it suitable for prototyping, field‑upgrades, or production changes where firmware versions are tweaked for different door types, barrier geometries, or safety levels. Because the 27C256 is a CMOS EPROM, it draws relatively little current (a few tens of mA active, tens of µA standby), which suits long‑term BLASI outdoor or indoor‑entrance applications. By using the BLASI – IC 27C256‑90F6 erasable DIL, BLASI can keep control logic in a compact, reprogrammable, non‑volatile memory while still supporting legacy hardware platforms that do not use modern flash or EEPROM‑based microcontrollers.
Article No: 8460055
Additional information
| Brand | BLASI |
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