AT45DB321D_07 Datasheet, PDF (2/55 Pages) ATMEL Corporation – 32-megabit 2.7-volt DataFlash

sequentially access its data. The simple sequential access dramatically reduces active pin
count, facilitates hardware layout, increases system reliability, minimizes switching noise, and
reduces package size. The device is optimized for use in many commercial and industrial appli-
cations where high-density, low-pin count, low-voltage and low-power are essential.
To allow for simple in-system reprogrammability, the AT45DB321D 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 AT45DB321D 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 Pinouts
Figure 2-1. MLF and CASON
Top View through Package
SI 1
SCK 2
RESET 3
CS 4
8 SO
7 GND
6 VCC
5 WP
Figure 2-3. DataFlash Card⁽¹⁾
Top View through Package
7654321
Note: 1. See AT45DCB004D Datasheet.
Figure 2-2. SOIC Top View
SI 1
SCK 2
RESET 3
CS 4
8 SO
7 GND
6 VCC
5 WP
Figure 2-4. TSOP Top View: Type 1
RDY/BUSY 1
RESET 2
WP 3
NC 4
NC 5
VCC 6
GND 7
NC 8
NC 9
NC 10
CS 11
SCK 12
SI 13
SO 14
28 NC
27 NC
26 NC
25 NC
24 NC
23 NC
22 NC
21 NC
20 NC
19 NC
18 NC
17 NC
16 NC
15 NC
Note: TSOP package is not recommended for new designs. Future die
shrinks will support 8-pin packages only.
2 AT45DB321D [Preliminary]
3597H–DFLASH–02/07