Document
Preliminary W27C020M
256K × 8 ELECTRICALLY ERASABLE EPROM
GENERAL DESCRIPTION
The W27C020M is a high speed, low power Electrically Erasable and Programmable Read Only Memory organized as 262144 × 8 bits that operates on a single 5 volt power supply. The W27C020M provides an electrical chip erase function.The W27C020M is designed to be used in 3.3V I/O bus interface enviornment.
FEATURES
• High speed access time: 70/90/120 nS (max.)
• Read operating current: 30 mA (max.) • Erase/Programming operating current:
30 mA (max.) • Standby current: 1 mA (max.) • Single 5V power supply
PIN CONFIGURATIONS
• +14V erase/+12V programming voltage • Fully static operation • Output level : 3.3V compatible output • All inputs and outputs directly TTL/CMOS
compatible • Three-state outputs • Available packages: 32-pin 600 mil DIP and
PLCC
BLOCK DIAGRAM
Vpp A16 A15 A12 A7 A6 A5 A4 A3 A2 A1 A0 Q0 Q1 Q2 GND
1 32 2 31 3 30 4 29 5 28 6 27 7 32-pin DIP 26 8 25 9 24 10 23 11 22 12 2.