S-93C86B Datasheet, PDF (13/34 Pages) Seiko Instruments Inc – CMOS SERIAL E2PROM

Rev.2.2_00
CMOS SERIAL E²PROM
S-93C86B
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 11 12 13 14
<1> 0 0 0 1
D15
8Xs
Hi-Z
t_CDS
29
Verify
Standby
D0
t_SV
t_PR
busy
ready
t_HZ1
Hi-Z
Figure 8 Chip Write Timing
4.5 Erasing chip (ERAL)
To erase the data of the entire memory address space, set all the data to 1, change CS to high, and
then input the ERAL instruction and an address following the start bit. Any address can be input.
There is no need to input data. The chips erase operation starts when CS goes low. When the
clocks more than the specified number have been input, the clock pulse monitoring circuit cancels
the ERAL instruction. For details of the clock pulse monitoring circuit, refer to “„ Function to
Protect Against Write due to Erroneous Instruction Recognition”.
CS
tCDS
SK
1 2 3 4 5 6 7 8 9 10 11 12 13
Verify
Standby
DI
<1> 0
0 10
8Xs
DO
tSV
busy _ready
tPR
tHZ1
Hi-Z
Figure 9 Chip Erase Timing
Seiko Instruments Inc.
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