The TMS27C128 and TMS27PC128 are 131,072-bit erasable and programmable read-only memories. They have a single 5V power supply, are pin compatible with existing 128K MOS ROMs, PROMs, and EPROMs, have fully TTL compatible inputs/outputs, and feature maximum access/minimum cycle times.
This datasheet describes the TMS27C128 series of 131,072-bit ultraviolet-light erasable, electrically programmable read-only memories (EPROMs) and the TMS27PC128 series of one-time electrically programmable read-only memories (PROMs). Both devices utilize power-saving CMOS technology and are pin-compatible with existing 128K MOS ROMs, PROMs, and EPROMs.
| Organization | 16K x 8 |
|---|---|
| Power Supply | Single 5-V |
| Access Time (27C128-12) | 120 ns |
| Access Time (27C/PC128-15) | 150 ns |
| Access Time (27C/PC128-20) | 200 ns |
| Access Time (27C/PC128-25) | 250 ns |
| Active Power Dissipation | 158 mW |
| Standby Power Dissipation | 1.4 mW |
| Latchup Immunity | 250 mA |
The TMS27C128 is UV erasable, while the TMS27PC128 is one-time programmable.
Programming requires a 12-13 V supply (Vpp) in addition to the 5-V supply.
The nominal programming time is two seconds using the SNAP! Pulse algorithm.
The manufacturer code is 97 and the device code is 83.