M27C800 is an 8 Mbit EPROM offered in the two ranges UV (ultra violet erase) and OTP (one time programmable). It is ideally suited for micro-processor systems requiring large data or program storage. It is organised as either 1 Mwords of 8 bit or 512 Kwords of 16 bit. The pin-out is compatible with the most common 8 Mbit Mask ROM. The FDIP42W (window ceramic frit-seal package) has a transparent lid which allows the user to ex- pose the chip to ultraviolet light to erase the bit pat- tern. A new pattern can then be written rapidly to the de- vice by following the programming procedure. For applications where the content is programmed only one time and erasure is not required, the M27C800 is offered in PDIP42, PLCC44 and SO44 packages.
The M27C800 is an 8 Mbit UV or OTP EPROM offered in FDIP42, PDIP42, PLCC44 and S044 packages. It is organized as either 1 Mword × 8 bits or 512 Kword × 16 bits and features a transparent lid for UV erasing. The device includes a two‑line control function (Chip Enable and Output Enable) to minimise power dissipation and prevent bus contention in memory arrays.
The datasheet details the electrical specifications, timing parameters, absolute maximum ratings, and recommended system decoupling. It also provides package mechanical dimensions, programming voltage and time, and standby mode behavior, along with a legal disclaimer from STMicroelectronics.
| Memory size | 8 Mbit (1 Mbyte × 8 or 512 Kbyte × 16) |
|---|---|
| Access time | 50 ns |
| Active current (8 MHz) | 70 mA |
| Stand‑by current | 50 µA |
| Programming voltage | 12.5 V ±0.25 V |
| Programming time | 50 µs per word |
| Ambient operating temperature | -40 °C to 125 °C |
| Storage temperature | -65 °C to 150 °C |
| Input/Output voltage range (except AQ) | -2 V to 7 V |
It consumes 70 mA of active current when running at 8 MHz.
A programming voltage of 12.5 V ±0.25 V is required.
The ambient operating temperature ranges from –40 °C to 125 °C, and the storage temperature from –65 °C to 150 °C.