73S8023C

The 73S8023C requires only a single 2.7 V to 3.6 V power supply which features a high-efficiency embedded DC-DC converter and the lock signal can be generated by an on-chip oscillator using an external crystal or by connecting an external clock signal. The 73S8023C device incorporates an ISO-7816-3 activation/deactivation sequencer that controls the card signals. Emergency card deactivation is initiated upon card extraction or upon any fault generated by the protection circuitry. This architecture, plus a Power Down digital input that allow placing the IC in a very low-power mode making the 73S8023C particularly suitable for low-power applications (cell-phones, PDAs, payphones, hand-held POS terminals.). The Teridian 73S8023C is a low-power, high efficiency, single smart card interface IC suitable for 3V and 5V cards. It provides full electrical compliance with ISO- 7816-3 and EMV 4.0 (EMV2000) specifications. Hardware support for any type of synchronous cards (memory cards) is provided. 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). A chip select input allows multiple 73S8023C ICs to share the same control bus. When chip select is set low, the host microcontroller inputs are latched and outputs are taken to a high impedance state.

The features of 73S8023C can be summarized as (1)complies with ISO-7816-3, EMV 4.0; (2)A DC-DC converter provides 3V / 5V to the card from an external power supply input; (3)high-efficiency converter: > 80% @ VDD =3.3 V, VCC =5 V and ICC= 65 mA; (4)up to 100 mA supplied to the card; (5)ISO-7816-3 activation / deactivation sequencer with emergency automated deactivation; (6)protection includes 2 voltage supervisors which detect voltage drops on card V CC and on V DD power supply; (7)the VDD voltage supervisor threshold value can be externally adjusted; (8)true over-current detection (150 mA max.); (9)2 card detection inputs, 1 for either possible switch configuration; (10)full support of synchronous cards; (11)3 digital inputs control the card activation / deactivation, card reset and card voltage; (12)3 digital inputs control the card clock (division rate and card clock source selection); (13)1 digital output, interrupt to the system controller, allows the system controller to monitor the card presence and faults; (14)1 Power down digital input (places the 73S8023C in a very low-power mode (card deactivated); (15)1 chip select digital input for parallel operation of several 73S8023C ICs.; (16)1 External clock input (STROBE), used for synchronous operation; (17)1 Digital output clock, buffered version of signal on XTALIN; (18)crystal oscillator or host clock (XTALIN), up to 27 MHz; (19) power supply: VDD2.7 V to 3.6 V; (20) 6 kV ESD Protection on the card interface:

The absolute maximum ratings of 73S8023C are (1)supply voltage V DD : -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 .