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PDF IZE4428 Data sheet ( Hoja de datos )
| Número de pieza | IZE4428 | |
| Descripción | 1K-byte EEPROM microcircuit | |
| Fabricantes | Integral | |
| Logotipo |  |
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IZE4428
1К-byte EEPROM microcircuit with function of protection for
writing and programmable secret code.
Microcircuit IZE4428 is designed to use in intellectual plastic cards. Sphere of application:
medical insurance, excess control systems, member cards, smart cards.
Features:
1024 x 8 - arrangement of EEPROM;
Byte - directed addressing;
Protection of memory writing;
1024 х 1 bit arrangement of memory protection ;
Response for reset;
Minimum 10000 cycles of erasure / writing ;
Information storage time - 5 years ;
Location 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
secret code (PSC);
Purpose of IC contact pads
CP
Symbol
Function
01 I/O Bidirectional data line (open drain )
02
CLK
clock rate input
03
RST
control input (reset )
04 Vcc supply voltage
05
GND
general
1
1 page  
IZE4428
Base commands of introduction Base enter commands
Byte l
Byte 2
Byte 3
Operation
S0 SI S2 S3 S4 S5 A8 A9 A0-A7
D0-D7
1 0 0 0 1 1 address address input data
writing and erasure with
bits bits
protection bit
1 10011
input data
writing and erasure
without protection bit
0 00011
data compared writing of protection bit
0 0 1 1 0 0 8 and 9 0-7
with data verification
have no value reading of 9 bit, data with
protection bit
0 11100
have no value reading of 8 bit, data
without protection bit
Commands of enter for PSC verification
byte l
byte 2 byte 3
S0 S1 S2 S3 S4 S5 A8 A9 A0-A7 D0-D7
0 1 0 0 1 1 1 1 253 mask bit
1 0 1 1 0 0 1 1 254 byte 1 ПСК
1 0 1 1 0 0 1 1 255 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
5 Page | ||
| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet IZE4428.PDF ] | |
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