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參數(shù)資料
| 型號： | AT49F020-90JI |
| 廠商： | ATMEL CORP |
| 元件分類： | DRAM |
| 英文描述： | 2-Megabit 256K x 8 5-volt Only CMOS Flash Memory |
| 中文描述： | 256K X 8 FLASH 5V PROM, 90 ns, PQCC32 |
| 封裝： | PLASTIC, MS-016AE, LCC-32 |
| 文件頁數(shù)： | 1/10頁 |
| 文件大?。?/td> | 84K |
| 代理商： | AT49F020-90JI |
1
Features
Single Voltage Operation
– 5V Read
– 5V Reprogramming
Fast Read Access Time - 55 ns
Internal Program Control and Timer
8K bytes Boot Block With Lockout
Fast Erase Cycle Time - 10 seconds
Byte By Byte Programming - 50
μ
s/Byte
Hardware Data Protection
DATA Polling For End Of Program Detection
Low Power Dissipation
– 50 mA Active Current
– 100
μ
A CMOS Standby Current
Typical 10,000 Write Cycles
Description
The AT49F020 is a 5-volt-only in-system Flash Memory. Its 2 megabits of memory is
organized as 262,144 words by 8 bits. Manufactured with Atmel’s advanced nonvola-
tile CMOS technology, the device offers access times to 55 ns with power dissipation
of just 275 mW over the commercial temperature range. When the device is dese-
lected, the CMOS standby current is less than 100
μ
A.
To allow for simple in-system reprogrammability, the AT49F020 does not require high
input voltages for programming. Five-volt-only commands determine the read and
programming operation of the device. Reading data out of the device is similar to
reading from an EPROM. Reprogramming the AT49F020 is performed by erasing the
entire 2 megabits of memory and then programming on a byte by byte basis. The byte
programming time is a fast 50
μ
s. The end of a program cycle can be optionally
detected by the DATA polling feature. Once the end of a byte program cycle has been
detected, a new access for a read or program can begin. The typical number of pro-
gram and erase cycles is in excess of 10,000 cycles.
2-Megabit
(256K x 8)
5-volt Only
CMOS Flash
Memory
AT49F020
0567B-A–8/97
Pin Configurations
Pin Name
Function
A0 - A17
Addresses
CE
Chip Enable
OE
Output Enable
WE
Write Enable
I/O0 - I/O7
Data Inputs/Outputs
NC
No Connect
DIP Top View
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
32
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
NC
A16
A15
A12
A7
A6
A5
A4
A3
A2
A1
A0
I/O0
I/O1
I/O2
GND
VCC
WE
A17
A14
A13
A8
A9
A11
OE
A10
CE
I/O7
I/O6
I/O5
I/O4
I/O3
PLCC Top View
5
6
7
8
9
10
11
12
13
29
28
27
26
25
24
23
22
21
A7
A6
A5
A4
A3
A2
A1
A0
I/O0
A14
A13
A8
A9
A11
OE
A10
CE
I/O7
4
3
2
1
3
3
3
1
1
1
1
1
1
2
I
I
G
I
I
I
I
A
A
A
N
V
W
A
TSOP Top View
Type 1
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
32
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
A11
A9
A8
A13
A14
A17
WE
VCC
NC
A16
A15
A12
A7
A6
A5
A4
OE
A10
CE
I/O7
I/O6
I/O5
I/O4
I/O3
GND
I/O2
I/O1
I/O0
A0
A1
A2
A3
(continued)
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| AT49F020-90PC | 2-Megabit 256K x 8 5-volt Only CMOS Flash Memory |
| AT49F020-90PI | 2-Megabit 256K x 8 5-volt Only CMOS Flash Memory |
| AT49F020-90TC | 2-Megabit 256K x 8 5-volt Only CMOS Flash Memory |
| AT49F020-90TI | 2-Megabit 256K x 8 5-volt Only CMOS Flash Memory |
| AT49F020-55JC | 2-Megabit 256K x 8 5-volt Only CMOS Flash Memory |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AT49F020-90PC | 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:2-Megabit 256K x 8 5-volt Only CMOS Flash Memory |
| AT49F020-90PI | 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:2-Megabit 256K x 8 5-volt Only CMOS Flash Memory |
| AT49F020-90TC | 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:2-Megabit 256K x 8 5-volt Only CMOS Flash Memory |
| AT49F020-90TI | 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:2-Megabit 256K x 8 5-volt Only CMOS Flash Memory |
| AT49F040 | 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:4-Megabit 512K x 8 5-volt Only CMOS Flash Memory |
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