73S8023C-IM/F Maxim Integrated Products, 73S8023C-IM/F Datasheet - Page 8

• Manufacturer Part Number: 73S8023C-IM/F
• Description: IC SMART CARD INTERFACE 32-QFN
• Manufacturer: Maxim Integrated Products
• Type: Smart Card Interfacer

Specifications of 73S8023C-IM/F

• Controller Type: Smart Card Interface
• Interface: *
• Voltage - Supply: 2.7 V ~ 3.6 V
• Current - Supply: 4.9mA
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 32-VFQFN Exposed Pad
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

73S8023C Data Sheet
3 Oscillator
The 73S8023C device has an on-chip oscillator that can generate the smart card clock using an external
crystal (connected between the pins XTALIN and XTALOUT) 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. Signal CLKOUT is the buffered version of the signal on XTALIN.
4 DC-DC Converter – Card Power Supply
An internal DC-DC converter provides the card power supply. This converter is able to provide either 3 V
or 5 V card voltage from the power supply applied on the V
controls the converter. Card voltage selection is carried out by the digital input 5V/#V.
The circuit is an inductive step-up converter/regulator. The external components required are 2 filter
capacitors on the power-supply input V
output filter capacitor on the card power supply V
step-up operation when V
and the input supply V
(V
Depending on the inductor values, the voltage 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 OFF.
Choice of the inductor
The nominal inductor value is 10 µH, rated for 400 mA. The inductor is connected between LIN (pin 2)
and the V
(I
Choice of the V
Depending on the applications, the requirements in terms of both the V
transient currents that the interface must provide to the card are different.
recommended capacitors for each V
8
CC_MAX
DD
= 3.6 V, V
EMV 4.1
ISO-7816-3
NDS
). The inductor should be located on the PCB as close as possible to the LIN pin of the IC.
Specification
DD
supply voltage. The inductor value can be optimized to meet a particular configuration
CC
CC
=3 V) the circuit operates as a linear regulator.
capacitor
Specification Requirement
DD
is less than the set point for V
Transient Current
CC
Min V
Allowed During
is below a set point of 5.0 or 3.0 volts minus a comparator hysteresis voltage
4.65 V
4.6 V
4.5 V
Table 1: Choice of VCC Pin Capacitor
CC
Voltage
CC
DD
power supply configuration and applicable specification.
(next to the LIN pin, 100 nF + 10 µF), an inductor, and an
Current Charge
Max Transient
CC
. The circuit performs regulation by activating the
30 nAs
20 nAs
40 nAs
CC
CC
. When V
to 150 mA. When an over-current condition is
DD
pin. The digital ISO-7816-3 sequencer
ESR < 100 mΩ
DD
X5R/X7R w/
Capacitor
is greater than the set point for V
CC
Type
minimum voltage and the
Table 1
Application
CC
shows the
as high as 100 mA.
Capacitor
3.3 µF
3.3 µF
Value
1 µF
DS_8023C_019
Rev. 1.5
CC