To allow for simple in-system reprogrammability, the AT45DB321C does not require high input
voltages for programming. The device operates from a single power supply, 2.7V to 3.6V, for
both the program and read operations. The AT45DB321C is enabled through the chip select pin
(CS) and accessed via a three-wire interface consisting of the Serial Input (SI), Serial Output
(SO), and the Serial Clock (SCK).
All programming and erase cycles are self-timed.
2. Pin Configurations and Packages
Table 2-1.
Pin Name
CS
SCK
SI
SO
WP
RESET
RDY/BUSY
Pin Configurations
Function
Chip Select
Serial Clock
Serial Input
Serial Output
Hardware Page Write Protect Pin
Chip Reset
Ready/Busy
Figure 2-1.
TSOP Top View – Type 1
Figure 2-2.
CBGA Top View
Figure 2-3.
SOIC Top View
RDY/BUSY
RESET
WP
NC
NC
VCC
1
2
3
4
5
6
28
27
26
25
24
23
NC
NC
NC
NC
NC
NC
1
through Package
2 3 4 5
GND
NC
NC
CS
SCK
1
2
3
4
5
28
27
26
25
24
VCC
NC
NC
WP
RESET
GND
NC
NC
NC
CS
SCK
SI
SO
7
8
9
10
11
12
13
14
22
21
20
19
18
17
16
15
NC
NC
NC
NC
NC
NC
NC
NC
A
B
C
D
E
NC
NC
NC
NC
NC NC NC NC
SCK GND VCC NC
CS RDY/BSY WP NC
SO SI RESET NC
NC
NC
NC
NC
SI
SO
NC
NC
NC
NC
NC
NC
6
7
8
9
10
11
12
13
23
22
21
20
19
18
17
16
RDY/BUSY
NC
NC
NC
NC
NC
NC
NC
NC
14
15
NC
Figure 2-4.
DataFlash Card (1) Top View
through Package
Figure 2-5.
CASON – Top View
through Package
SI
1
8
SO
7 6 5 4 3 2 1
SCK
RESET
CS
2
3
4
7
6
5
G N D
V CC
W P
Note:
2
1. See AT45DCB004C Datasheet
AT45DB321C
3387M–DFLASH–2/08
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