AT25256W-10SI-2.7 Atmel, AT25256W-10SI-2.7 Datasheet - Page 9

• Manufacturer Part Number: AT25256W-10SI-2.7
• Description: IC EEPROM 256KBIT 3MHZ 8SOIC
• Manufacturer: Atmel

Specifications of AT25256W-10SI-2.7

• Format - Memory: EEPROMs - Serial
• Memory Type: EEPROM
• Memory Size: 256K (32K x 8)
• Speed: 2.1MHz, 3MHz
• Interface: SPI, 3-Wire Serial
• Voltage - Supply: 2.7 V ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 8-SOIC (5.3mm Width), 8-SOP, 8-SOEIAJ
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

Timing Diagrams (for SPI Mode 0 (0, 0))
Figure 3. Synchronous Data Timing
0872O–SEEPR–03/05
SCK
SO
CS
SI
V
V
V
V
V
V
V
V
OH
OL
IH
IH
IH
IL
IL
IL
t
CSS
HI-Z
The AT25128/256 is capable of a 64-byte page write operation. After each byte of data
is received, the six-low order address bits are internally incremented by one; the high-
order bits of the address will remain constant. If more than 64 bytes of data are transmit-
ted, the address counter will roll over and the previously written data will be overwritten.
The AT25128/256 is automatically returned to the write disable state at the completion
of a write cycle.
NOTE: If the device is not Write enabled (WREN), the device will ignore the Write
instruction and will return to the standby state, when CS is brought high. A new CS fall-
ing edge is required to reinitiate the serial communication.
Table 10. Address Key
t
SU
VALID IN
Don’t Care Bits
Address
A
t
N
WH
t
H
t
WL
t
V
AT25128
A
A
15
13
- A
- A
14
0
t
HO
t
CSH
AT25128/256
t
DIS
AT25256
t
A
HI-Z
CS
14
A
15
- A
0
9