AT25256B-XHL-B Atmel, AT25256B-XHL-B Datasheet - Page 7

• Manufacturer Part Number: AT25256B-XHL-B
• Description: IC EEPROM 256KBIT 20MHZ 8TSSOP
• Manufacturer: Atmel

Specifications of AT25256B-XHL-B

• Format - Memory: EEPROMs - Serial
• Memory Type: EEPROM
• Memory Size: 256K (32K x 8)
• Speed: 5MHz, 10MHz, 20MHz
• Interface: SPI, 3-Wire Serial
• Voltage - Supply: 1.8 V ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 8-TSSOP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Figure 1-2.
2. Functional Description
8593C–SEEPR–8/09
SPI Serial Interface
The AT25128B/256B is designed to interface directly with the synchronous serial peripheral
interface (SPI) of the 6800 type series of microcontrollers.
The AT25128B/256B utilizes an 8-bit instruction register. The list of instructions and their opera-
tion codes are contained in . All instructions, addresses, and data are transferred with the MSB
first and start with a high-to-low CS transition.
Table 2-1.
Instruction Name
WREN
WRDI
RDSR
Instruction Set for the AT25128B/256B
Instruction Format
0000 X110
0000 X100
0000 X101
AT25128B/256B [Preliminary]
Operation
Set Write Enable Latch
Reset Write Enable Register
Read Status Register
AT25128B/256B
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