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

• Manufacturer Part Number: AT25256B-SSHL-B
• Description: EEPROM 256Kbit; SPI Bus High Spd; Mode 0 & 3
• Manufacturer: Atmel

Specifications of AT25256B-SSHL-B

• Memory Size: 256Kbit
• Memory Configuration: 32768 X 8
• Interface Type: Serial, SPI
• Clock Frequency: 3MHz
• Supply Voltage Range: 1.8V To 5.5V
• Memory Case Style: SOIC
• No. Of Pins: 8
• Rohs Compliant: Yes
• Density: 256Kb
• Organization: 32Kx8
• Access Time (max): 80ns
• Frequency (max): 5MHz
• Write Protection: Yes
• Data Retention: 100Year
• Operating Supply Voltage (typ): 2.5/3.3/5V
• Package Type: SOIC
• Operating Temp Range: -40C to 85C
• Supply Current: 10mA
• Operating Supply Voltage (min): 1.8V
• Operating Supply Voltage (max): 5.5V
• Operating Temperature Classification: Industrial
• Mounting: Surface Mount
• Pin Count: 8
• 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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