s-24c04bphal Seiko Instruments Inc., s-24c04bphal Datasheet - Page 10

• Manufacturer Part Number: s-24c04bphal
• Description: 2-wire Cmos Serial E2prom
• Manufacturer: Seiko Instruments Inc.

3. Data transfer
4. Acknowledgment
10
2-WIRE CMOS SERIAL E
S-24C04BPHAL
Changing the SDA line while the SCL line is “L” allows the data to be transferred.
A start or stop condition is recognized when the SDA line changes while the SCL line is “H”.
8 bits of data are transferred in succession. The device on the system bus that receives the data changes
the SDA line to “L” during the 9th clock cycle and outputs the acknowledge signal to inform that it has
received the data.
The device does not output the acknowledge signal while the E
(E
(E
(Master output)
2
2
PROM output)
PROM input)
SDA
SCL
SDA
SCL
SDA
Start condition
2
PROM
Figure 8 Acknowledge Output Timing
t
SU. DAT
Figure 7 Data Transfer Timing
1
Seiko Instruments Inc.
t
HD. DAT
2
PROM is being rewritten.
8
t
AA
Acknowledge
output
9
t
DH
Rev.3.0
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