KK4428 Datasheet, PDF (7/9 Pages) KODENSHI KOREA CORP. – 1К-byte EEPROM microcircuit with function of protection for writing and programmable secret code.

KK4428
RST
CLK
I/O
tRE
tH
Data introduction
td3
td4
Removal of data or
verification of PSC
0
1
23
0
1
td5
tL
td1`
td2
Stable
data
Figure 3 - Data introduction, removal of data and verification of programmable secret code
RST
Data
introduction
CLK
0 1 23 0 1 2
E/W
Active
(internal signal)
I/O
S0 S1 D7
Programming
99 102
tE
199 202
tW
Figure 4 - programming: erasure and writing