DESCRIPTION
The Teridian 73S8009C is a versatile power management and single smart card interface circuit that is ideally suited for smart card reader products that are battery and/or USB bus-powered. In addition to its EMV 4.1 and ISO-7816-3 compliant smart card-to-host interface circuitry; it provides control, conversion, and regulation of power for a companion host processor circuit and power for the smart card. The 73S8009C can operate from a single 2.7 V to 6.5 V source supply, or a combination of battery power (4.0 V to 6.5 V) and USB power (4.4 V to 5.5 V).
The 73S8009C supports 5 V, 3 V, and 1.8 V smart cards. The smart card signals for RST, CLK, IO, and auxiliary signals AUX1 and AUX2 are level-shifted to the selected VCC value. Although the host controller is required to handle the detailed signal timing for activation and de-activation under normal conditions, the 73S8009C blocks any spurious signals on CLK, RST and IO during power-up (as VCC rises) and power-down. The 73S8009C contains two handshaking signals for the controller: OFF indicates that a card is present, and RDY indicates that VCC is at an acceptable value. The 73S8009C will perform emergency deactivation upon card removal, voltage faults, or over-current events
The power management circuitry of the 73S8009C allows operation from a wide range of voltages from multiple sources. VPC is converted by using an inductive, step-up power converter to the intermediate voltage, VP. VP is used by linear voltage regulators and switches to create the voltages VDD and as required, VCC. VDD is used by the 73S8009C and is also made available for the companion controller circuit or other external circuits. The VBAT and VBUS pins provide inputs from alternate power sources as required. An internal switch in the 73S8009C acts as a single-pole, double-throw switch that selects either VBAT or VBUS to be connected to VPC. When the voltage on VBUS is zero, VBAT is connected to VPC. When voltage is applied to VBUS, the switch selects VBUS as the source for power.
When power is supplied by VPC or VBAT, the 73S8009C is controlled by the ON_OFF pin in the manner of a “push-on/push-off” button action. The OFF_REQ and OFF_ACK signals provide handshaking and control of the power “off” function by the controller. A SPST momentary switch to ground connected to ON_OFF is all that is required for power control. Alternatively, the “off” state can be initiated from the host controller through OFF_ACK. When the 73S8009C is “off,” the current is less than 1 μA.
When power is supplied via the VBUS pin, the 73S8009C is unconditionally in the “power-on” state regardless of the action of the ON/OFF switch or OFF_ACK signal. Power supply current operating from the VBUS power when VCC is off is less than 500 μA to conform to USB “SUSPEND” requirements.

APPLICATIONS
• Handheld PINpad smart card readers for e-commerce, secure login, e-health, Gov’t ID and loyalty
• Point of Sales & Transaction Terminals
• General Purpose Smart Card Readers

ADVANTAGES
• Ideally suited to USB bus-powered applications
 Ideal for combo bus-powered and/or self-powered systems
 Automatic battery switchover in bus powered systems
• Very low-power mode (sub-μA) with push-button ON/OFF switch input with de-bounce
• Provides 3.3 V / 40 mA power to external circuitry (host processor or peripheral circuits)
• The inductor-based DC-DC converter provides higher current and efficiency than usual charge-pump capacitor-based converters:
 Ideal for battery-powered applications

FEATURES
• Smart card Interface:
• Complies with ISO-7816-3 and EMV 4.1 and derivative standards
• A DC-DC Converter provides 1.8 V/3 V/5 V to the card from a wide range of external power supply inputs
• Provides up to 65 mA to the card
• ISO-7816-3 Card emergency deactivation sequencer
• 2 voltage supervisors detect voltage drops on the VCC (card) and VDD (digital) power supplies
• Card over-current detection 150 mA max.
• 2 card detection inputs, 1 for either user polarity
• Auxiliary I/O lines for synchronous and ISO-7816-12 USB card support
• Card CLK clock frequency up to 20 MHz
• 6 kV ESD and short circuit protection on the card interface
• System Controller Interface:
• 5 Signal images of the card signals (RSTIN, CLKIN, I/OUC, AUX1UC and AUX2UC)
• 2 Inputs activate and select the card voltage (CMDVCC% and CMDVCC#)
• 2 Outputs, interrupt to the system controller (OFF and RDY), to inform the system controller of the card presence / faults and status of the interface
• 1 Chip Select input
• 2 Handshaking signals for proper shutdown sequencing of all output supply voltages (OFF_REQ, OFF_ACK)
• ON/OFF Main System Switch:
• Input for an SPST momentary switch to ground
• DC-DC Converter:
• Step-up converter
• Generates an intermediary voltage VP
• Requires a single 10 μH Inductor
• System Power Supply requirements:
• When using VBUS: Standard USB +5 input (range +4.4 V to 5.5 V)
• When using VBAT: 4.0 V to 6.5 V
• When using VPC: 2.7 V to 6.5 V
• Automated detection of voltage presence - Priority on VBUS over VBAT
• Power Supply Output:
• VDD supply output available to power up external circuitry: 3.3 V ±0.3 V, 40 mA
• Industrial temperature range
• Small format QFN package
• RoHS compliant (6/6) lead-free package