X24001 Datasheet, PDF (4/13 Pages) Xicor Inc. – Identi™PROM

X24001
Programming Operation
Programming of the X24001 is performed one byte at a
time. After each byte is written, a delay equal to the write
cycle time of 5ms must be observed before initiating the
next write cycle.
The sequence of operations is: first raise the SCL pin to
V_PGM and generate a HIGH to LOW transition of SDA
(programming mode start). This is followed by eight bits
of data containing the program command bits, four
address bits and two don’t care bits, immediately fol-
lowed by the 8-bit data byte.
The timing of the operation conforms to the standard
A.C. timing requirements and follows the sequence
shown below. After generating the Programming Mode
start condition the SCL HIGH level can be either V_IH
or V_PGM.
Figure 3. Programming Sequence
Factory Programming Service
The X24001 can be programmed with customer specific
data prior to shipment. The data programmed can be in
two forms: static data pattern where there is no change
in the data in a group of devices or sequential data, such
as a base number incremented by one for each device
tested and shipped.
Customers requiring one of these services should con-
tact their local sales office for ordering procedures and
service charges.
VPGM
SCL
VIH
SDA
S
T
A
R
T
0 1 A3 A2 A1 A0 XX XX D7 D6 D5 D4 D3 D2 D1 D0
3830 FHD F05.1
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