M27C256B-90B1 Datasheet PDF - ST Microelectronics

●DESCRIPTION

●The M27C256B is a 256 Kbit EPROM offered in the two ranges UV (ultra violet erase) and OTP (one time programmable). It is ideally suited for microprocessor systems and is organized as 32,768 by 8 bits.

●The FDIP28W (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 to the device by following the programming procedure.

●For applications where the content is programmed only one time and erasure is not required, the M27C256B is offered in PDIP28, PLCC32 and TSOP28 (8 x 13.4 mm) packages.

●■ 5V ± 10% SUPPLY VOLTAGE in READ OPERATION

●■ ACCESS TIME: 45ns

●■ LOW POWER CONSUMPTION:

●   – Active Current 30mA at 5MHz

●   – Standby Current 100µA

●■ PROGRAMMING VOLTAGE: 12.75V ± 0.25V

●■ PROGRAMMING TIME: 100µs/word

●■ ELECTRONIC SIGNATURE

●   – Manufacturer Code: 20h

●   – Device Code: 8Dh