73S8024C

The Teridian 73S8024C device incorporates an ISO-7816-3 activation/deactivation sequencer that controls the card signals and it is a single smart card interface IC. 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. It provides full electrical compliance with ISO-7816-3, EMV 4.0 and NDS specifications 1: 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). Level shifters drive the card signals with the selected card voltage (3 V or 5 V), coming from an internal DC-DC converter. 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 features of 73S8024C can be summarized as (1)complies with ISO-7816-3, EMV 4.0 and NDS 1; (2)A DC-DC Converter provides 3V / 5V to the card from an external power supply input; (3)high-efficiency converter: > 80% @ V DD =3.3 V, V CC =5 V and I CC = 65 mA; (4)Up to 100 mA supplied to the card; (5)ISO-7816-3 Activation / Deactivation sequencer with emergency automated deactivation on card removal or fault detected by the protection circuitry; (6)protection includes 2 voltage supervisors which detect voltage drops on card V CC and on VDD; (7)the VDD power supplies can be externally adjusted; (8)true over-current detection (150 mA max.) voltage supervisor threshold value; (9)2 card detection inputs, 1 for each possible user polarity; (10)auxiliary I/O lines, for C4/C8 contact signals; (11)card clock up to 20 MHz; (12)3 digital inputs control the card activation / deactivation, card reset and card voltage; (13)4 digital inputs control the card clock (division rate and card clock stop modes); (14)1 digital output, interrupt to the system controller, allows the system controller to monitor the card presence and faults.; (15)crystal oscillator or host clock, up to 27 MHz; (16)power supply: VDD 2.7 V to 3.6 V; (17)power down mode; (18)6 kV ESD protection on the card interface; (19)Package: SO28:

The absolute maximum ratings of 73S8024C are (1)supply voltage VDD: -0.5 to 4.0 VDC; (2)input voltage for digital inputs: -0.3 to (V DD +0.5) VDC; (3)storage temperature : -60 °C to 150 °C; (4)pin voltage (except lin and card interface): -0.3 to (V DD +0.5) VDC; (5)pin voltage (LIN) : -0.3 to 6.0 VDC; (6)pin voltage (card interface): -0.3 to (V CC + 0.5) VDC; (7)ESD tolerance card interface pins: +/- 6 kV; (8)ESD tolerance other pins: +/- 2 kV .