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Numéro de référence | AT45DB021 | ||
Description | 2-Megabit 2.7-volt Only Serial DataFlash | ||
Fabricant | ATMEL Corporation | ||
Logo | |||
1 Page
Features
• Single 2.7V - 3.6V Supply
• Serial Interface Architecture
• Page Program Operation
– Single Cycle Reprogram (Erase and Program)
– 1024 Pages (264 Bytes/Page) Main Memory
• Two 264-Byte SRAM Data Buffers – Allows Receiving of Data
while Reprogramming of Non-Volatile Memory
• Internal Program and Control Timer
• Fast Page Program Time – 7 ms Typical
• 120 µs Typical Page to Buffer Transfer Time
• Low Power Dissipation
– 4 mA Active Read Current Typical
– 5 µA CMOS Standby Current Typical
• 5 MHz Max Clock Frequency
• Hardware Data Protection Feature
• Serial Peripheral Interface (SPI) Compatible – Modes 0 and 3
• CMOS and TTL Compatible Inputs and Outputs
• Commercial and Industrial Temperature Ranges
Description
The AT45DB021 is a 2.7-volt only, serial interface Flash memory suitable for in-sys-
tem reprogramming. Its 2,162,688 bits of memory are organized as 1024 pages of
264-bytes each. In addition to the main memory, the AT45DB021 also contains two
SRAM data buffers of 264-bytes each. The buffers allow receiving of data while a
page in the main memory is being reprogrammed. Unlike conventional Flash memo-
ries that are accessed randomly with multiple address lines and a parallel interface,
the DataFlash uses a serial interface to sequentially access its data. The simple serial
interface facilitates hardware layout, increases system reliability, minimizes switching
Pin Configurations
(continued)
PLCC
Pin Name Function
CS
SCK
SI
SO
WP
RESET
RDY/BUSY
Chip Select
Serial Clock
Serial Input
Serial Output
Hardware Page Write
Protect Pin
Chip Reset
Ready/Busy
SCK
SI
SO
NC
NC
NC
NC
NC
NC
5
6
7
8
9
10
11
12
13
29 WP
28 RESET
27 RDY/BUSY
26 NC
25 NC
24 NC
23 NC
22 NC
21 NC
Note: PLCC package pins 16
and 17 are DON’T CONNECT.
RDY/BUSY
RESET
WP
NC
NC
NC
VCC
GND
NC
NC
NC
NC
CS
SCK
SI
SO
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
TSOP Top View
Type 1
32 NC
31 NC
30 NC
29 NC
28 NC
27 NC
26 NC
25 NC
24 NC
23 NC
22 NC
21 NC
20 NC
19 NC
18 NC
17 NC
SOIC
GND
NC
NC
CS
SCK
SI
SO
NC
NC
NC
NC
NC
NC
NC
1
2
3
4
5
6
7
8
9
10
11
12
13
14
28 VCC
27 NC
26 NC
25 WP
24 RESET
23 RDY/BUSY
22 NC
21 NC
20 NC
19 NC
18 NC
17 NC
16 NC
15 NC
2-Megabit
2.7-volt Only
Serial
DataFlash®
AT45DB021
Rev. 0868B–07/98
1
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Pages | Pages 18 | ||
Télécharger | [ AT45DB021 ] |
No | Description détaillée | Fabricant |
AT45DB021 | 2-Megabit 2.7-volt Only Serial DataFlash | ATMEL Corporation |
AT45DB021-JC | 2-Megabit 2.7-volt Only Serial DataFlash | ATMEL Corporation |
AT45DB021-JI | 2-Megabit 2.7-volt Only Serial DataFlash | ATMEL Corporation |
AT45DB021-RC | 2-Megabit 2.7-volt Only Serial DataFlash | ATMEL Corporation |
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