W27C020 Datasheet, PDF (1/14 Pages) Winbond – 256K X 8 ELECTRICALLY ERASABLE EPROM

Preliminary W27C020
256K × 8 ELECTRICALLY ERASABLE EPROM
GENERAL DESCRIPTION
The W27C020 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 W27C020
provides an electrical chip erase function.
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
• All inputs and outputs directly TTL/CMOS
compatible
• Three-state outputs
• Available packages: 32-pin 600 mil DIP and
PLCC
PIN CONFIGURATIONS
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
21
13
20
14
19
15
18
16
17
Vcc
PGM
A17
A14
A13
A8
A9
A11
OE
A10
CE
Q7
Q6
Q5
Q4
Q3
/
AAA V V P A
1 11 p c G1
2 5 6 p c M7
432133 3
A7
5
2 1 0 ₂₉
A14
A6
6
28
A13
A5
7
27
A8
A4
8
26
A9
A3
9 ^{32-pin PLCC} 25
A11
A2
10
A1
11
24
OE
23
A10
A0
12 _{1 1 1 1 1 1 2} 22
CE
Q0
13 4 5 6 7 8 9 0 21
Q7
Q QGQ QQQ
1 2 N3 4 5 6
D
PGM
CE
OE
CONTROL
A0
.
A17
VCC
GND
VPP
DECODER
Q0
OUTPUT
BUFFER
.
Q7
CORE
ARRAY
PIN DESCRIPTION
SYMBOL
A0−A17
Q0−Q7
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
Publication Release Date: September 1998
-1-
Revision A1