AT45DB642D-CNU-SL954 ATMEL [ATMEL Corporation], AT45DB642D-CNU-SL954 Datasheet - Page 4

• Manufacturer Part Number: AT45DB642D-CNU-SL954
• Description: 64-megabit 2.7-volt Dual-interface DataFlash
• Manufacturer: ATMEL [ATMEL Corporation]

Table 2-1.
4
Symbol
SER/BYTE
V
GND
V
GNDP
Figure 2-1.
CC
CCP
RDY/BUSY
SCK/CLK
RESET
GND
VCC
AT45DB642D
WP
NC
NC
NC
NC
NC
CS
SO
SI
Name and Function
Serial/8-bit Interface Control: The DataFlash may be configured to utilize either its serial port or
8-bit port through the use of the serial/8-bit control pin (SER/BYTE). When the SER/BYTE pin is
held high, the serial port (SI and SO) of the DataFlash will be used for all data transfers, and the
8-bit port (I/O7 - I/O0) will be in a high impedance state. Any data presented on the 8-bit port
while SER/BYTE is held high will be ignored. When the SER/BYTE is held low, the 8-bit port will
be used for all data transfers, and the SO pin of the serial port will be in a high impedance state.
While SER/BYTE is low, any data presented on the SI pin will be ignored. Switching between the
serial port and 8-bit port should only be done while the CS pin is high and the device is not busy
in an internally self-timed operation.
The SER/BYTE pin is internally pulled high; therefore, if the 8-bit port is never to be used, then
connection of the SER/BYTE pin is not necessary. In addition, if the SER/BYTE pin is not
connected or if the SER/BYTE pin is always driven high externally, then the 8-bit input/output pins
(I/O7-I/O0), the VCCP pin, and the GNDP pin should be treated as “no connect”.
Device Power Supply: The V
Operations at invalid V
Ground: The ground reference for the power supply. GND should be connected to the system
ground.
8-bit Port Supply Voltage: The VCCP pin is used to supply power for the 8-bit input/output pins
(I/O7-I/O0). The VCCP pin needs to be used if the 8-bit port is to be utilized; however, this pin
should be treated as “no connect” if the SER/BYTE pin is not connected or if the SER/BYTE pin is
always driven high externally.
8-bit Port Ground: The GNDP pin is used to provide ground for the 8-bit input/output pins (I/O7-
I/O0). The GNDP pin needs to be used if the 8-bit port is to be utilized; however, this pin should
be treated as “no connect” if the SER/BYTE pin is not connected or if the SER/BYTE pin is
always driven high externally.
Pin Configurations (Continued)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
TSOP Top View: Type 1
CC
voltages may produce spurious results and should not be attempted.
CC
pin is used to supply the source voltage to the device.
28
27
26
25
24
23
22
21
20
19
18
17
16
15
NC
NC
I/O7
I/O6
I/O5
I/O4
VCCP
GNDP
I/O3
I/O2
I/O1
I/O0
SER/BYTE
NC
Figure 2-2.
Note:
Figure 2-3.
1. See AT45DCB008D Datasheet.
DataFlash Card
CASON Top View through Package
RESET
SCK
CS
7 6 5 4 3 2 1
SI
1
2
3
4
8
7
6
5
(1)
SO
GND
VCC
WP
Asserted
State
Low
3542H–DFLASH–4/08
–
–
–
–
Ground
Ground
Power
Power
Type
Input