NXP Semiconductors has developed the MIFARE Classic MF1S50 to be used in a contactless smart card according to ISO/IEC 14443 Type A.
The MIFARE Classic 1K MF1S50 IC is used in applications like public transport ticketing and can also be used for various other applications.
Anticollision
An intelligent anticollision function allows to operate more than one card in the field simultaneously. The anticollision algorithm selects each card individually and ensures that the execution of a transaction with a selected card is performed correctly without interference from another card in the field.
Simple integration and user convenience
The MF1S50 is designed for simple integration and user convenience which allows complete ticketing transactions to be handled in less than 100 ms.
Security
• Manufacturer programmed 7-byte UID or 4-byte NUID identifier for each device
• Random ID support
• Mutual three pass authentication (ISO/IEC DIS 9798-2)
• Individual set of two keys per sector to support multi-application with key hierarchy
Features and benefits
EEPROM
> Contactless transmission of data and supply energy
> Operating distance up to 100 mm depending on antenna geometry and reader configuration
> Operating frequency of 13.56 MHz > Data transfer of 106 kbit/s
> Data integrity of 16-bit CRC, parity, bit coding, bit counting
> Anticollision
> Typical ticketing transaction time of < 100 ms (including backup management)
> 1 kB, organized in 16 sectors of 4 blocks (one block consists of 16 byte)
> User definable access conditions for each memory block
> Data retention time of 10 years
> Write endurance 100000 cycles
Applications
> Public transportation
> Access management
> Electronic toll collection
> Car parking
> School and campus cards
> Employee cards
> Internet cafés
> Loyalty

Proximity card readers provide versatility. You are able to put them to use anywhere on the pc, office table or entrance of the building. A lot of the proximity card readers use rechargeable batteries, and some have a very battery back system. As regarding almost all of the access control systems, you can customize proximity card readers to support passwords and NFC CARD usernames.