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PDF IZ4428 Data sheet ( Hoja de datos )
| Número de pieza | IZ4428 | |
| Descripción | Intelligent 1024 byte EEPROM with write protect function & security logic | |
| Fabricantes | IK Semiconductor | |
| Logotipo |  |
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m IZ4428
U.co1К-byte EEPROM microcircuit with function of protection for
t4writing and programmable secret code.
heeMicrocircuit IZ4428 is designed to use in intellectual plastic cards. Sphere of application:
Smedical insurance, excess control systems, member cards, smart cards.
.DataFeatures:
ww1024 x 8 - arrangement of EEPROM;
w Byte - directed addressing;
Protection of memory writing;
1024 х 1 bit arrangement of memory protection ;
mResponse for reset;
oMinimum 10000 cycles of erasure / writing ;
Information storage time - 5 years ;
.cLocation of contact pads and serial interface in accordance with ISO 7816 standard;
Data in memory can be changed only after introduction of correct 2-byte programmable
Usecret code (PSC);
t4Purpose of IC contact pads
eeCP Symbol
h01 I/O
02 CLK
S03 RST
ta04 Vcc
www.Da05 GND
Function
Bidirectional data line (open drain )
clock rate input
control input (reset )
supply voltage
general
www.DataSheet4U.com
1 page  
Response for reset
IZ4428
Reset can be supplied at any time during microcircuit operates. After reset during 32-clock
pulses to the line I/O, contents of first 4 bytes of memory are read.
System of commands
Base commands of introduction Base enter commands
Byte l
S0 SI S2 S3 S4 S5 A8 A9
1 0 0 0 1 1 address
bits
1 10011
Byte 2
A0-A7
address
bits
0 00011
0 0 1 1 0 0 8 and 9
0-7
0 11100
Byte 3
Operation
D0-D7
input data
writing and erasure with
protection bit
input data
writing and erasure
without protection bit
data compared writing of protection bit
with data verification
have no value reading of 9 bit, data with
protection bit
have no value reading of 8 bit, data
without protection bit
Commands of enter for PSC verification
byte l
byte 2
S0 S1 S2 S3 S4 S5 A8 A9 A0-A7
0 1 0 0 1 1 1 1 253
1 0 1 1 0 0 1 1 254
1 0 1 1 0 0 1 1 255
byte 3
D0-D7
mask bit
byte 1 ПСК
byte 2 ПСК
operation
writing of error counter
verification of the first byte PSC
verification of the second byte PSC
In erased state memory cells shall be read as logic "1". After operation of writing memory
cells shall be read as logic "0".
There are three kind of operations of writing /erasure, that are implemented automatically
by the microcircuit:
-erasure and following writing (duration is 203 timing pulses CLK, f=20 kHz);
-only writing, if no one of the 8 bit in addressed byte requires to be turned from "0" into "1
(duration is 103 timing pulses CLK, f=20 kHz);
-only erasure - if there are no turns from "1" into "0" in addressed byte (duration is 103
timing pulses CLK, f=20 kHz).
5 Page | ||
| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet IZ4428.PDF ] | |
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