M27V400

Note: 1. Except for the rating "Operating Temperature Range", stresses above those listed
              in  the Table " Absolute Maximum Ratings" may cause permanent damage to the device.
              These are stress ratings only and operation of the device at these or any other conditions
              above those indicated in the Operating sections of this specification is not implied. Exposure 
              to Absolute Maximum Rating conditions for extended periods may affect device reliability. 
              Refer  also to the STMicroelectronics SURE Program and other relevant quality documents.
         2. Minimum DC voltage on Input or Output is 0.5V with possible undershoot to 2.0V for a period
             less than 20ns. Maximum DC voltage on Output is V_CC +0.5V with possible overshoot to V_CC +2V
             for a period  less than 20ns.
        3. Depends on range.

The M27V400 is an 4 Mbit EPROM offered in the two ranges UV (ultra violet erase) and OTP (one time programmable). It is ideally suited for microprocessor systems requiring large data or program storage. It is organised as either 512 Kwords of 8  bit or 256 Kwords of 16 bit. The pin-out is compatible with the most common 4 Mbit Mask ROM.

The FDIP40W  (window ceramic frit-seal package) has a transparent lid which allows the user to expose the chip to ultraviolet light to erase the bit pattern.

A new pattern can then be written rapidly to the device by following the programming procedure.

For applications where the content is programmed only one time and erasure is not required, the M27V400 is offered in PDIP40 package.