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W49F020 Datasheet Preview

W49F020 Datasheet

256K x 8 CMOS FLASH MEMORY

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Preliminary W49F020
256K × 8 CMOS FLASH MEMORY
GENERAL DESCRIPTION
The W49F020 is a 2-megabit, 5-volt only CMOS flash memory organized as 256K × 8 bits. The device
can be programmed and erased in-system with a standard 5V power supply. A 12-volt VPP is not
required. The unique cell architecture of the W49F020 results in fast program/erase operations with
extremely low current consumption (compared to other comparable 5-volt flash memory products). The
device can also be programmed and erased using standard EPROM programmers.
FEATURES
Single 5-volt operations:
5-volt Read
5-volt Erase
5-volt Program
Fast Program operation:
Byte-by-Byte programming: 50 µS (max.)
Fast Erase operation: 100 mS (typ.)
Fast Read access time: 70/90 nS
Endurance: 1K/10K cycles (typ.)
Twenty-year data retention
Hardware data protection
One 8K byte Boot Block with Lockout
protection
Low power consumption
Active current: 25 mA (typ.)
Standby current: 20 µA (typ.)
Automatic program and erase timing with
internal VPP generation
End of program or erase detection
Toggle bit
Data polling
Latched address and data
TTL compatible I/O
JEDEC standard byte-wide pinouts
Available packages: 32-pin DIP and 32-pin
TSOP and 32-pin-PLCC
Publication Release Date: October 1999
- 1 - Revision A1




Winbond

W49F020 Datasheet Preview

W49F020 Datasheet

256K x 8 CMOS FLASH MEMORY

No Preview Available !

Preliminary W49F020
PIN CONFIGURATIONS
NC
A16
A15
A12
A7
A6
A5
A4
A3
A2
A1
A0
DQ0
DQ1
DQ2
GND
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
32-pin
DIP
32
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
VDD
WE
A17
A14
A13
A8
A9
A11
OE
A10
CE
DQ7
DQ6
DQ5
DQ4
DQ3
AAA V / A
1 1 1 N DW 1
2 5 6 CDE 7
4 3 2 1 32 31 30
A7
A6
A5
A4
A3
A2
A1
A0
DQ0
5 29
6 28
7 27
8 32-pin 26
9 PLCC 25
10 24
11 23
12 22
13 21
14 15 16 17 18 19 20
A14
A13
A8
A9
A11
OE
A10
CE
DQ7
DDGDDDD
QQN QQQQ
12D3456
A11
A9
A8
A13
A14
A17
WE
VDD
NC
A16
A15
A12
A7
A6
A5
A4
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
32-pin
TSOP
32 OE
31 A10
30 CE
29 DQ7
28 DQ6
27 DQ5
26 DQ4
25 DQ3
24 GND
23 DQ2
22 DQ1
21 DQ0
20 A0
19 A1
18 A2
17 A3
BLOCK DIAGRAM
VDD
VSS
CE
OE
WE
A0
.
.
A17
W49F020
CONTROL
DECODER
OUTPUT
BUFFER
DQ0
..
DQ7
MAIM MEMORY
248K BYTES
BOOT BLOCK
8K BYTES
3FFFF
02000
01FFF
00000
PIN DESCRIPTION
SYMBOL
A0A17
DQ0DQ7
CE
OE
WE
VDD
GND
NC
PIN NAME
Address Inputs
Data Inputs/Outputs
Chip Enable
Output Enable
Write Enable
Power Supply
Ground
No Connection
-2-


Part Number W49F020
Description 256K x 8 CMOS FLASH MEMORY
Maker Winbond
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W49F020 Datasheet PDF






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