S-24C128C Datasheet, PDF (27/35 Pages) Seiko Instruments Inc – Write protect function during the low power supply voltage

Rev.4.0_02_H
2-WIRE SERIAL E²PROM
S-24C128C
8. Operation when input stop condition during input write data
The S-24C128C does the write operation only when it receives data of 1 byte or more and receives a stop condition
immediately after ACK output.
Refer to Figure 30 regarding details.
Write Enable
by stop condition
Write Enable
by stop condition
Write Enable
by stop condition
S
W
T
R
A
I
R DEVICE
T
T ADDRESS E
SDA
LINE
1 0 1 0 A2 A1 A0 0
UPPER
WORD ADDRESS (n)
x x W13
W8
Write Inhibition
by stop condition
LOWER
WORD ADDRESS (n)
DATA (n)
W7
W0 D7 D6 D5 D4 D3 D2 D1 D0
Write Inhibition
by stop condition
Write Inhibition
by stop condition
DATA (n+1)
S
T
O
DATA (n+x) P
D7
D0 D7
D0
M
LRA
A
A
A
A
A
S
S/C
C
C
C
C
C
B
BWK
K
K
K
K
K
Figure 30 Write Operation by Inputting Stop Condition during Write
9. Command cancel by start condition
By a start condition, users are able to cancel command which is being input. However, adjust the phase while the
S-24C128C is outputting “L” because users are not able to input a start condition. When users cancel the command,
there may be a case that the address will not be identified. Use random read for the read operation, not current
address read.
10. Precaution for use
Do not operate these ICs in excess of the absolute maximum ratings. Attention should be paid to the power supply
voltage, especially. The surge voltage which exceeds the maximum absolute ratings can cause latch-up and
malfunction. Perform operations after confirming the detailed operation condition in the data sheet.
Operations with moisture on the S-24C128C pins may occur malfunction by short-circuit between pins. Especially,
in occasions like picking the S-24C128C up from low temperature tank during the evaluation. Be sure that not
remain frost on the S-24C128C’s pins to prevent malfunction by short-circuit.
Also attention should be paid in using on environment, which is easy to dew for the same reason.
27