S-93C46B Datasheet, PDF (17/45 Pages) Seiko Instruments Inc – CMOS SERIAL E2PROM

Rev.4.3_00
CMOS SERIAL E²PROM
S-93C46B/56B/66B
4. 4 Writing to chip (WRAL)
To write the same 16-bit data to the entire memory address space, change CS to high, and then
input the WRAL instruction, an address, and 16-bit data following the start bit. Any address can be
input. The write operation starts when CS goes low. There is no need to set the data to 1 before
writing. If the clocks more than the specified number have been input, the clock pulse monitoring
circuit cancels the WRAL instruction. For details of the clock pulse monitoring circuit, refer to “„
Function to Protect Against Write due to Erroneous Instruction Recognition”.
CS
tCDS
Verify
Standby
SK
1 2 3 4 5 6 7 8 9 10
25
DI
<1> 0 0 0 1
DO
Hi-Z
D15
4Xs
D0
tSV
tPR
Busy
Ready
tHZ1
Hi-Z
Figure 14 Chip Write Timing (S-93C46B)
CS
SK
DI
DO
1 2 3 4 5 6 7 8 9 10 11 12
<1> 0 0 0 1
D15
6Xs
Hi-Z
tCDS
27
Verify
Standby
D0
tSV
t PR
Busy
Ready
t HZ1
Hi-Z
Figure 15 Chip Write Timing (S-93C56B, S-93C66B)
Seiko Instruments Inc.
17