器件名称: W27C020M-12
功能描述: 256K X 8 ELECTRICALLY ERASABLE EPROM
文件大小: 160.89KB 共14页
简 介: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
+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
PIN CONFIGURATIONS
Vpp A16 A15 A12 A7 A6 A5 A4 A3 A2 A1 A0 Q0 Q1 Q2 GND 1 2 3 4 5 6 8 9 10 11 12 13 14 15 16 32 31 30 29 28 27 25 24 23 22 21 20 19 18 17 Vcc PGM A17 A14 A13 A8 A9 A11 OE A10 CE Q7 Q6 Q5 Q4 Q3
BLOCK DIAGRAM
PGM CE OE CONTROL OUTPUT BUFFER Q0
.
Q7
7 32-pin DIP 26
A0
.
A17 VCC GND VPP
CORE DECODER ARRAY
/ A A A V V P A 1 1 1 p c G 1 2 5 6 p c M 7 3 2 1 3 3 3 2 1 0 29 28 27 26 32-pin PLCC 25 24 23 1 1 1 1 1 2 22 5 6 7 8 9 0 21
PIN DESCRIPTION
SYMBOL A0A17 Q0Q7 CE OE PGM VPP VCC GND DESCRIPTION Address Inputs Data Inputs/Outputs Chip Enable Output Enable Program Enable Program/Erase Supply Voltage Power Supply Ground
A7 A6 A5 A4 A3 A2 A1 A0 Q0
4 5 6 7 8 9 10 11 12……
