AT29C257-12

The AT29C257-12 is designed as 5V-only in-system programmable and erasable read only memory (PEROM). Its 256K of memory is organized as 32,768 words by 8bits. Manufactured with Atmel's advanced nonvolatile CMOS's technology, the device offers access times to 120ns with power dissipation of just 440mW.

It has many features. (1)Fast read access time 120ns. (2)Five volt only reprogramming. (3)Page program operation single sysle reprogram (erase and program) and internal address and data latches for 64bytes. (4)Fast program cycle times which would be 10ms. (5)Internal program control timer. (6)Low power dissipation which means 80mA active current and 300uA CMOS standby current. (7)Hardware and software data protection. (8)DATA polling for end or program detection. (9)High reliability CMOS technology. And so on.

Some absolute maximum ratings have been concluded into several points as follow. (1)Its temperature under bias would be from -55°C and max 125°C. (2)Its storage temperature range would be from -65°C to 150°C. (3)Its all input voltages (including NC pins) with respect to ground would be from -0.6V to 6.25V. (4)Its all output voltages with respect to ground would be from -0.6V to Vcc+0.6V. (5)Its voltage on OE with respect to ground would be from -0.6V to 13.5V. It should be noted that stresses above those listed in absolute maximum ratings may cause permanent damage to device.

Also some electrical characteristics are concluded as follow. (1)Its input load current would be max 10uA. (2)Its output leakage current would be max 10uA. (3)Its Vcc standby current CMOS would be max 300uA. (4)Its Vcc standby current TTL would be max 3mA. (5)Its Vcc active current would be max 50mA. (6)Its input low voltage would be max 0.8V. (7)Its input high voltage would be min 2.0V. (7)Its output low voltage would be max 0.45V. (8)Its output high voltage would be min 2.4V. (9)Its output high voltage CMOS would be min 4.2V. If you have any question or suggestion or want to know more information please contact us for details. Thank you!