S-34C04A Datasheet, PDF (20/22 Pages) Seiko Instruments Inc – FOR DIMM SERIAL PRESENCE DETECT

2-WIRE SERIAL E²PROM FOR DIMM SERIAL PRESENCE DETECT
S-34C04A
Rev.1.0_01_U
4. SDA pin and SCL pin noise suppression time
This IC includes a built-in low-pass filter at the SDA pin and the SCL pin to suppress noise. If the power supply
voltage is 2.2 V, noise with a pulse width of 75 ns or less can be suppressed.
For details of the assurable value, refer to noise suppression time (tl) in Table 8 in " AC Electrical
Characteristics".
400
300
Noise suppression time
(tI) max.
200
[ns]
100
0
1.5 2.0 2.5 3.0 3.5 4.0
Power supply voltage (VDD)
[V]
Figure 19 Noise Suppression Time for SDA Pin and SCL Pin
5. Operation when inputting stop condition during write
This IC does write operation only when it receives data of 1 byte or more and receives a stop condition immediately
after an acknowledge output.
Refer to Figure 20 for details.
Write valid
by stop condition
Write valid
by stop condition
Write valid
by stop condition
S
W
T
R
A
I
R DEVICE T
T SELECT CODE E
SDA
LINE
1 0 1 0 SA2 SA1 SA0 0
Write invalid
by stop condition
WORD ADDRESS (n)
DATA (n)
W7W6W5W4W3W2 W1W0 D7 D6 D5 D4 D3 D2 D1 D0
Write invalid
by stop condition
Write invalid
by stop condition
DATA (n + 1)
S
T
O
DATA (n + x) P
D7
D0 D7
D0
M
LRA
A
A
A
A
S
S/C
C
C
C
C
B
BWK
K
K
K
K
Figure 20 Write Operation by Inputting Stop Condition during Write
6. Command cancel by start condition
By a start condition, users are able to cancel command which is being input. However, users are not able to input a
start condition when this IC is outputting "L". 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.
20