W29C040-90B

The W29C040-90B is a 4-megabit, 5-volt only CMOS page mode EEPROM organized as 512K ´ 8 bits.The device can be written (erased and programmed) in-system with a standard 5V power supply.

Features of the W29C040-90B are:(1)single 5-volt write (erase and program) operations;(2)fast page-write operations;(3)fast chip-erase operation: 50 mS;(4)two 16 KB boot blocks with lockout;(5)typical page write (erase/program) cycles:1K/10K (typ.);(6)read access time: 90/120 nS;(7)software and hardware data protection;(8)low power consumption;(9)automatic write (erase/program) timing with internal VPP generation;(10)end of write (erase/program) detection;(11)latched address and data;(12)all inputs and outputs directly TTL compatible;(13)JEDEC standard byte-wide pinouts;(14)available packages: TSOP and PLCC.

The limiting avlues of the W29C040-90B can be summarized as:(1):the parameter is power supply voltage to Vss potential,the rating is -0.5 to +7.0,the unit is V;(2):the parameter is operating temperature,the rating is 0 to +70,the unit is ;(3):the parameter is storage temperature,the rating is -65 to +150,the unit is ;(4):the parameter is D.C. voltage on any pin to ground potential except A9,the rating is -0.5 to VDD +1.0,the unit is V;(5):the parameter is transient voltage (<20 nS ) on any pin to ground potential,the rating is -1.0 to VDD +1.0,the unit is V;(6):the parameter is voltage on A9 and OE pin to ground potential,the rating is -0.5 to 12.5,the unit is V.