DESCRIPTION The Teridian 73S8024C is a single smart card interface IC. It provides full electrical compliance with ISO-7816-3, EMV 4.0 and NDS specifications1. Interfacing with the system controller is done through the control bus, composed of digital inputs to control the interface, and one interrupt output to inform the system controller of the card presence and faults. Data exchange with the card is managed from the system controller using the I/O line (and eventually the auxiliary I/O lines). Hardware support for auxiliary I/O lines, C4 / C8 contacts, is provided. The card clock signal can be generated by an on-chip oscillator using an external crystal or by connection to a clock signal coming from the system controller. The Teridian 73S8024C device incorporates an ISO-7816-3 activation/deactivation sequencer that controls the card signals. Level shifters drive the card signals with the selected card voltage (3 V or 5 V), coming from an internal DC-DC converter. With its high-efficiency DC-DC converter, the Teridian 73S8024C is a cost-effective solution for any smart card reader application to be powered from a single 2.7 V to 3.6 V power supply. Emergency card deactivation is initiated upon card extraction or upon any fault generated by the protection circuitry. The fault can be a VDD (digital power supply) or a VCC (card power supply) failure, a card over-current, or
an over-heating fault.

FEATURES
• Card Interface:
 Complies with ISO-7816-3, EMV 4.0 and NDS1
 A DC-DC Converter provides 3V / 5V to the card from an external power supply input
 High-efficiency converter: > 80% @ VDD=3.3 V, VCC=5 V and ICC
 Up to 100 mA supplied to the card = 65 mA
 ISO-7816-3 Activation / Deactivation sequencer with emergency automated deactivation on card removal or fault detected by the protection circuitry
 Protection includes 2 voltage supervisors which detect voltage drops on card VCC and on VDD
 The Vpower supplies
DD
 True over-current detection (150 mA max.) voltage supervisor threshold value can be externally adjusted
 2 card detection inputs, 1 for each possible user polarity
 Auxiliary I/O lines, for C4/C8 contact signals
 Card clock up to 20 MHz