AT24C256B-PU Atmel, AT24C256B-PU Datasheet - Page 7

• Manufacturer Part Number: AT24C256B-PU
• Description: IC EEPROM 256KBIT 1MHZ 8DIP
• Manufacturer: Atmel

Specifications of AT24C256B-PU

• Format - Memory: EEPROMs - Serial
• Memory Type: EEPROM
• Memory Size: 256K (32K x 8)
• Speed: 400kHz, 1MHz
• Interface: I²C, 2-Wire Serial
• Voltage - Supply: 1.8 V ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 8-DIP (0.300", 7.62mm)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Figure 4-3.
Figure 4-4.
Figure 4-5.
Note:
5279C–SEEPR–3/09
SCL
SDA
SDA OUT
SDA
SCL
SDA IN
1. The write cycle time t
SCL
WORDn
Software Reset
Bus Timing
Write Cycle Timing
Start bit
t
SU.STA
8th BIT
SOFTWARE RESET: After an interruption in protocol, power loss or system reset, any 2-wire
part can be protocol reset by following these steps: (a) Create a start bit condition, (b) clock 9
cycles, (c) create another start bit followed by stop bit condition as shown below. The device is
ready for next communication after above steps have been completed.
WR
1
is the time from a valid stop condition of a write sequence to the end of the internal clear/write cycle.
t
ACK
HD.STA
t
t
F
LOW
2
t
AA
CONDITION
Dummy Clock Cycles
t
STOP
HIGH
3
t
HD.DAT
t
LOW
t
wr
8
(1)
t
t
SU.DAT
DH
CONDITION
9
START
Start bit
AT24C256B
t
R
t
SU.STO
Stop bit
t
BUF
7