73S8010C Maxim, 73S8010C Datasheet - Page 10

• Manufacturer Part Number: 73S8010C
• Description: The 73S8010C is a single smart card interface IC, compliant to the electrical requirements of ISO 7816-3 and EMV 4
• Manufacturer: Maxim

3 Oscillator
The Teridian 73S8010C device has an on-chip oscillator that can generate the smart card clock using an
external crystal, connected between the XTALIN and XTALOUT pins, to set the oscillator frequency.
When the card clock signal is available from another source, it can be connected to the pin XTALIN, and
the pin XTALOUT should be left unconnected.
4 DC-DC Converter – Card Power Supply
An internal DC-DC converter provides the card power supply. This converter is able to provide either a
3 V or 5 V card voltage from the power supply applied on the V
controls the converter. Bit 2 of the Control register selects the card voltage.
The circuit is an inductive step-up converter/regulator. The external components required are 2 filter
capacitors on the power-supply input V
filter capacitor on the card power supply V
operation when V
input supply V
3.6 V, V
converter can provide current on V
The circuit provides over-current protection and limits I
sensed, the circuit initiates a deactivation sequence from the control logic and reports back to the host
controller a fault on the interrupt output INT.
Choice of the Inductor
The nominal inductor value is 10 H, rated for 400 mA. The inductor is connected between pin LIN (pin 5
in the SO package, pin 2 in the QFN package) and the V
optimized to meet a particular configuration (I
close as possible to the LIN pin of the IC.
Choice of the V
Depending on the applications, the requirements in terms of both V
currents that the interface must be able to provide to the card vary.
capacitors for each V
10
Specification
EMV 4.0
ISO-7816-3
CC
= 3 V) the circuit operates as a linear regulator. Depending on the inductor values, the voltage
DD
CC
is less than the set point for V
CC
Specification Requirement
Capacitor
is below a set point of 5.0 or 3.0 volts minus a comparator hysteresis voltage and the
Min V
Allowed During
Transient Current
CC
power supply configuration and applicable specification.
CC
4.5V
4.6V
Voltage
CC
Table 4: Choice of Vcc Capacitor
as high as 100 mA.
DD
(100 nF + 10 F, next to the LIN pin), an inductor, and an output
CC
. The circuit performs regulation by activating the step-up
Max Transient
Current Charge
CC_MAX
CC
. When V
30nA.s
20nA.s
). The inductor should be located on the PCB as
CC
DD
to 150 mA. When an over-current condition is
DD
voltage. The value of the inductor can be
is greater than the set point for V
DD
pin. The digital ISO-7816-3 sequencer
Capacitor Type
ESR < 100 m
X5R/X7R w/
CC
Table 4
minimum voltage and transient
Application
shows the recommended
Capacitor Value
3.3 F
1 F
CC
(V
Rev. 1.5
DD
=