s-93c46a Seiko Instruments Inc., s-93c46a Datasheet - Page 8

• Manufacturer Part Number: s-93c46a
• Description: Cmos Serial E2prom
• Manufacturer: Seiko Instruments Inc.

CS
SK
DI
DO
2. Write (WRITE, ERASE, WRAL, ERAL)
volatile memory when CS goes low at the completion of the specified clock input.
93C46A/56A/66A, it is easy to VERIFY the completion of the write operation in order to minimize the write cycle by setting
CS to high and checking the DO pin, which is low during the write operation and high after its completion. This VERIFY
procedure can be executed over and over again.
When DO outputs high after completion of the write operation or if it is in the high-impedence state (Hi-Z), the input of
instructions is available. Even if the DO pin remains high, it will enter the high-impedence state upon the recognition of a
high of DI (start-bit) attached to the rising edge of an SK pulse. (see Figure 3).
There are four write instructions, WRITE, ERASE, WRAL, and ERAL. Each automatically begins writing to the non-
The write operation is completed in 10 ms (t
Because all SK and DI inputs are ignored during the write operation, any input of instruction will also be disregarded.
DI input should be low during the VERIFY procedure.
1
1
1
2
0
3
A
7
4
Hi-Z
A
6
5
A
5
6
A
4
7
A
3
8
A
2
9
A
10
1
A
11
0
0
12
Figure 6
D
15
13
D
Seiko Instruments Inc.
14
14
D
PR
13
Max.), and the typical write period is less than 5 ms. In the S-
Read Timing (S-93C66A)
24
25
D
2
A
26
7
D
A
1
6
A
27
D
5
A
0
4
A
28
D
3
15
A
2
29
A
D
1
14
A
0
+1
D
13
40
41
D
CMOS SERIAL E
2
42
A
D
7
A
1
6
43
A
D
5
0
A
S-93C46A/56A/66A
4
44
A
D
15
3
A
2
45
D
A
14
1
A
0
D
+2
13
2
PROM
Hi-Z
7