S-93C46B_1 Datasheet, PDF (16/50 Pages) Seiko Instruments Inc – 3-WIRE SERIAL E2PROM

3-WIRE SERIAL E²PROM
S-93C46B/56B/66B
Rev.7.0_00
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”.
t_CDS
CS
Verify
Standby
SK
1 2 3 4 5 6 7 8 9 10
25
DI
c ^{0 00} 1
High-Z
DO
D15
4Xs
D0
t_SV
t_PR
t_HZ1
busy
ready
High-Z
Figure 15 Chip Write Timing (S-93C46B)
t_CDS
CS
Verify
Standby
SK
1 2 3 4 5 6 7 8 9 10 11 12
27
DI
c 0 00 1
6Xs
High-Z
DO
D15
D0
t_SV
t_PR
t_HZ1
busy
ready
High-Z
Figure 16 Chip Write Timing (S-93C56B, S-93C66B)
16
Seiko Instruments Inc.