Overview
| brand | Zhongyi | model | four thousand four hundred and forty-two |
| specifications | zero point eight four | Processing customization | yes |
| Product characteristics | 4442 contact type | Imported or not | yes |
| producing area | Shenzhen | Sensing distance | five |
| storage capacity | 1k | Power supply method | Passive card |
Product Details
Contact type 4442 chip card
(Other chips include: 4428, AT88SC102, AT24C02/04, AT88SC1608)
Product feature description: Intelligent tape write protection function and security logic
Capacity: 256 bytes
Product standard: ISO7816
Security feature: The initial password of the 4442 card for secure password transmission is ffffff
Password protected bytes
Irrevocable chip code
Working voltage and current: 5V10MA (domestic products have voltage working products of 2.7-5.5V)
Write/erase count: 100000 times
Each write/erase time: 2.5MS
Application scope: insurance, access control, electronic door locks, internet cafes, and other credit cards
SLE4442 is an encrypted storage IC chip with a capacity of 256 bytes. After verifying the correct password, the card can be read
Write operation.
1. Main features:
>256 * 8 bit EEPROM>Byte Direct Addressing
>The first 32 bytes of the low address can be used for write protection (solidification) operations.
>3-byte user password, password error count: 3 times
>Complies with ISO7816-3 synchronization protocol
>100000 fewer erasures
>Data retention period: 10 years
>Working voltage: 5V
>Large power supply current: 20mA
2. Confidentiality:
-All data must be readable and not writable until the password is verified to be correct.
-After verifying the correct password, data can be written or modified to modify the password.
-Error counter, with an initial value of 3. If there is a password verification error once, it will be subtracted by 1. If the counter value is 0, the card will automatically
Locked, data can only be read out and cannot be changed or password verified; If it is not zero, there is one
The secondary password verification is correct and can be restored to the initial value of 3.
-Each byte of the write protected area (the first 32 bytes) can be individually written protected. After being written protected, the content does not
It can be changed again (i.e. solidified data).
