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NM24C65 Datasheet(PDF) 6 Page - Fairchild Semiconductor

Part # NM24C65
Description  64K-Bit Extended 2-Wire Bus Interface Serial EEPROM with Write Protect
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Manufacturer  FAIRCHILD [Fairchild Semiconductor]
Direct Link  http://www.fairchildsemi.com
Logo FAIRCHILD - Fairchild Semiconductor

NM24C65 Datasheet(HTML) 6 Page - Fairchild Semiconductor

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NM24C65 Rev. C.3
Write Cycle Timing
ACKNOWLEDGE
Acknowledge is a software convention used to indicate successful
data transfers. The transmitting device, either master or slave, will
release the bus after transmitting eight bits. During the ninth clock
cycle the receiver will pull the SDA line LOW to acknowledge that
it received the eight bits of data. Refer to
Figure 4.
The NM24C65xxx device will always respond with an acknowl-
edge after recognition of a start condition and its slave address. If
Write Cycle Timing (Figure 1)
SDA
SCL
STOP
CONDITION
START
CONDITION
WORD n
8th BIT
ACK
tWR
SDA
SCL
DATA STABLE
DATA
CHANGE
SDA
SCL
START
BIT
STOP
BIT
DS500042-4
DS500042-5
Data Validity (Figure 2)
Definition of Start and Stop (Figure 3)
DS500042-6
both the device and a WRITE operation have been selected, the
NM24C65xxx will respond with an acknowledge after the receipt
of each subsequent eight bit word.
In the READ mode the NM24C65xxx slave will transmit eight bits
of data, release the SDA line and monitor the line for an acknowl-
edge. If an acknowledge is detected and no stop condition is
generated by the master, the slave will continue to transmit data.
If an acknowledge is not detected, the slave will terminate further
data transmissions and await the stop condition to return to the
standby power mode.
SCL FROM
MASTER
Data Output
from Transmitter
Data Output
from Receiver
START
Acknowledge
18
9
Acknowledge Response from Receiver (Figure 4)
DS500042-7


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