TMS27C040 is 524288 by 8-bit UV erasable, TMS27PC040 is 524288 by 8-bit OTP erasable memories.
The document details the specifications for the TMS27C040 (UV erasable) and TMS27PC040 (one-time programmable) EPROMs. These devices are fabricated using CMOS technology, offering high speed and simple interface compatibility with MOS and bipolar circuits. They feature a 524,288-bit capacity organized as 65,536 words by 8 bits.
| Capacity | 524,288 by 8-bit (4194304-bit) |
|---|---|
| Supply Voltage (Read) | 5 V |
| Package Type | 32-Pin Dual In-Line Package / Plastic Leaded Chip Carrier |
| Access Time (10ns version) | 100 ns |
The manufacturer's code is 97 (Hex) and the device code is 50 (Hex).
No, logic lows programmed into an OTP PROM cannot be erased.