S-93A46A Datasheet, PDF (14/34 Pages) Seiko Instruments Inc – CMOS SERIAL E2PROM

CMOS SERIAL E²PROM
S-93A46A/56A/66A
Rev.2.1_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.
When the clocks more than the specified number 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
SK
DI
DO
1 2 3 4 5 6 7 8 9 10
<1> ^{0 0 0} 1
Hi-Z
D15
4Xs
t_CDS
25
Verify
Standby
D0
t_SV
t_PR
busy
ready
t_HZ1
Hi-Z
Figure 10 Chip Write Timing (S-93A46A)
t_CDS
CS
Verify
Standby
SK
1 2 3 4 5 6 7 8 9 10 11 12
27
DI
<1> ^{0 0 0} 1
6Xs
DO
Hi-Z
D15
D0
t_SV
t_PR
busy
ready
t_HZ1
Hi-Z
Figure 11 Chip Write Timing (S-93A56A/66A)
14
Seiko Instruments Inc.