Smart Card Interface ICs

General Description

The 73S8024RN is a single smart card interface IC, compliant to the electrical requirements of ISO-7816-3, EMV 4.0 (EMV2000) and NDS electrical specifications. It is available either in a standard SO28 package, or in a 32-pin QFN package (5 x 5 x 0.8mm), making it the smallest solution available today in the market. It can be used in conjunction with any host microcontroller that can support the smart card protocol layer. In its SO28 package option, the Teridian 73S8024RN is an advantageous replacement for the industry-standard device TDA8004 since it offers better performance and requires fewer external components.

A significant advantage of the 73S8024RN over existing IC solutions is the use of a Low Drop-Out (LDO) voltage regulator to generate the card power supply (VCC) from a nominal power supply source (VPC) of 5V (or 3V when using 3V cards only). Digital circuitry is separately powered by a digital power supply VDD, typically 3.3V, which is independent from the 5V supply of the LDO regulator. The LDO exhibits improved noise performance when compared to typical step-up converter based ICs, which generate a lot of undesired noise and ripple causing problems when trying to comply with applicable standards. The LDO architecture also allows the 73S8024RN to be the highest card current capable smart card interface IC available today in the market, with up to 90mA minimum provided to the card. Finally, the LDO regulator IC solution, with fewer external components, makes the 73S8024RN a more cost effective solution for high-volume smart card readers in consumer electronics applications such as set-top-boxes, digital TVs, or personal video recorders.


  • Card Interface
    Complies with ISO-7816-3, EMV 4.1
    Provides at least 90mA to the card
    LDO voltage regulator provides 3V / 5V to the card from an external power supply input
    ISO-7816-3 Activation / Deactivation sequencer
    Emergency card deactivation upon hardware fault:
  • Card removal
  • Voltage supervision faults: Detection of voltage drops on VCC (card), VDD
  • (digital) and VPC (regulator)
  • power supplies
  • Adjustable power supply (VDD) fault detection (2 resistors needed)
  • Card over-current (true current detection)
  • Die over-heating fault
    Card clock sop (high or low)
    2 card detection inputs, 1 for each possible user polarity
    Auxiliary I/O lines, for C4 / C8 contact signals
  • System Controller Interface
    3 Digital inputs control the card activation / deactivation, card reset and card voltage
    4 Digital inputs control the card clock (division rate and card clock stop modes)
    1 Digital output (interrupt) to the system controller, allows the system controller to monitor the card presence and faults
  • Power Supply
    LDO Regulator (VPC)
    4.75V to 5.5V (ISO7816/EMV 4.0)
    4.85V to 5.5V (NDS)
    Digital Interfacing (VDD): 2.7V to 5.5V
  • 6KV ESD Protection on the card interface
  • Package: SO28 or 32QFN