BL7442LV Datasheet, PDF (1/10 Pages) SHANGHAI BELLING CO., LTD. – Low voltage Intelligent 2K bits EEPROM

BL7442LV Low voltage
Intelligent 2K bits EEPROM
Description
BL7442LV is a IC Card chip (module) made
by 1.2um CMOS EERPOM process. It has
256 byte EEPROM with logical encryption and
function. It can be operated at low
voltage.BL7442LV has two types, type A and
type B.
Features
Figure 1
• 256 x 8 bit EEPROM organization
• Byte-wise addressing
• Irreversible byte-wise write protection of lowest 32 addresses (Byte 0 ……31)
• 32 x1 bit organization of protection memory
• Two-wire link protocol
• End of processing indicated at data output
• Answer-to-Reset according to ISO standard 7816-3(B type)
• EEPROM programming time 2.5 ms per byte for both Erasing and writing
• Minimum of 100,000 write/erase cycles
• Data retention time :>10 years
• Contacts configuration and serial interface according to ISO 7816 standard (synchronous
transmission)
• BL7442LV A type: Data can only be read(include Answer-to-Reset )and changed after entry
of the correct 3-byte Programmable security code
• BL7442LV B type: Data can only be changed after entry of the correct 3-byte Programmable
security code
Pin Description
Pin No.
1
2
3
4
5
6
7
8
Parameter
C1
C2
C3
C4
C5
C6
C7
C8
Symbol
Vdd
RST
CLK
N.C.
GND
NC
I/O
NC
Function Description
Supply Voltage
Reset signal
Clock input
Not connected
Ground
Not connected
Bidirectional data line (open drain)
Not connected
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Total 10 Pages
8/16/2006