AT24HC02B-PU Atmel, AT24HC02B-PU Datasheet - Page 9

• Manufacturer Part Number: AT24HC02B-PU
• Description: IC EEPROM 2KBIT 1MHZ 8DIP
• Manufacturer: Atmel

Specifications of AT24HC02B-PU

• Format - Memory: EEPROMs - Serial
• Memory Type: EEPROM
• Memory Size: 2K (256 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)
• Organization: 256 x 8
• Interface Type: 2-Wire
• Maximum Clock Frequency: 1 MHz
• Access Time: 900 ns
• Supply Voltage (max): 5.5 V
• Supply Voltage (min): 1.8 V
• Maximum Operating Current: 3 mA
• Maximum Operating Temperature: + 85 C
• Mounting Style: Through Hole
• Minimum Operating Temperature: - 40 C
• Operating Supply Voltage: 2.5 V, 3.3 V, 5 V
• Memory Configuration: 256 X 8
• Clock Frequency: 1MHz
• Supply Voltage Range: 1.8V To 5.5V
• Memory Case Style: DIP
• No. Of Pins: 8
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: AT24HC02B-10PU-1.8; AT24HC02B-10PU-1.8

Write Operations
Figure 9. Page Write
5134D–SEEPR–4/07
SDA LINE
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ADDRESS
DEVICE
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The eighth bit of the device address is the read/write operation select bit. A read opera-
tion is initiated if this bit is high, and a write operation is initiated if this bit is low.
Upon a compare of the device address, the EEPROM will output a “0”. If a compare is
not made, the chip will return to a standby state.
BYTE WRITE: A write operation requires an 8-bit data word address following the
device address word and acknowledgement. Upon receipt of this address, the EEPROM
will again respond with a “0” and then clock in the first 8-bit data word. Following receipt
of the 8-bit data word, the EEPROM will output a “0” and the addressing device, such as
a microcontroller, must terminate the write sequence with a stop condition. At this time,
the EEPROM enters an internally-timed write cycle, t
inputs are disabled during this write cycle, and the EEPROM will not respond until the
write is complete, see Figure 8 on page 9.
Figure 8. Byte Write
PAGE WRITE: The 2K EEPROM is capable of an 8-byte page write.
A page write is initiated the same as a byte write, but the microcontroller does not send
a stop condition after the first data word is clocked in. Instead, after the EEPROM
acknowledges receipt of the first data word, the microcontroller can transmit up to seven
(2K) more data words. The EEPROM will respond with a “0” after each data word
received. The microcontroller must terminate the page write sequence with a stop condi-
tion, see Figure 9.
The data word address lower three (2K) bits are internally incremented following the
receipt of each data word. The higher data word address bits are not incremented,
retaining the memory page row location. When the word address, internally generated,
reaches the page boundary, the following byte is placed at the beginning of the same
page. If more than eight (2K) data words are transmitted to the EEPROM, the data word
address will “roll over” and previous data will be overwritten.
A
C
K
WORD ADDRESS (n)
SDA LINE
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ADDRESS
DEVICE
DATA (n)
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A
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WORD ADDRESS
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K
DATA (n + 1)
WR
, to the nonvolatile memory. All
A
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K
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K
DATA
DATA (n + x)
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9