IS24C128A
IS24C256A
Figure 4. Data Validity Protocol
SCL
SDA
Data Change
Data Stable
Data Stable
Figure 5. Slave Address
BIT 7 6 5 4 3 2 1 0
1 0 1 0 A2 A1 A0 R/W
ISSI ®
Figure 6. Byte Write
S
W
T
R
S
A
R
Device
I
T
T
O
T Address E Word Address
Word Address
Data
P
SDA
A
A
A
A
Bus
Activity
C*t
C
C
C
K
K
K
K
M
L
M
S
B
S
B
S
B
R/W
* = Don't care bit
t = Don't care bit for IS24C128A
Figure 7. Page Write
S
W
T
R
A
R
Device
I
T
T Address E Word Address (n) Word Address (n)
Data (n)
SDA
A
A
A
A
Bus
C*t
C
C
C
Activity
K
K
K
K
M
L
S
S
B
B
R/W
* = Don't care bit
t = Don't care bit for IS24C128A
Data (n+1)
A
C
K
S
T
O
Data (n+63) P
A
C
K
Integrated Silicon Solution, Inc. — www.issi.com — 1-800-379-4774
7
ADVANCEDINFORMATION Rev. 00B
06/27/06