GENERAL DESCRIPTION
The W27E257 is a high-speed, low-power Electrically Erasable and Programmable Read Only Memory organized as 32768 ´ 8 bits that operates on a single 5 volt power supply. The W27E257 provides an electrical chip erase function. This part was the same EPROM Writers utilities as the W27E256.

FEATURES
· High speed access time: 100/120/150 nS (max.)
· Read operating current: 15 mA (typ.)
· Erase/Programming operating current 1 mA (typ.)
· Standby current: 5 mA (typ.)
· Single 5V power supply
· +14V erase/+12V programming voltage
· Fully static operation
· All inputs and outputs directly TTL/CMOS compatible
· Three-state outputs
· Available packages: 28-pin 600 mil DIP and 32-pin PLCC