73S8024RN
Low-Cost Smart Card Interface
DATA SHEET
Rev. 2 1
DESCRIPTION
The 73S8024RN is a single smart card (ICC) interface IC
that can be controlled by a dedicated control bus. The
73S8024RN has been designed to provide full electrical
compliance with ISO 7816-3, EMV 4.0 (EMV2000) and
NDS specifications.
Interfacing with the system controller is done through a
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.
The card clock can be generated by an on-chip oscillator
using an external crystal or by connection to a clock
signal.
The 73S8024RN incorporates an ISO 7816-3
activation/deactivation sequencer that controls the card
signals. Level-shifters drive the card signals with the
selected card voltage (3V or 5V), coming from an internal
Low Drop-Out (LDO) voltage regulator. This LDO
regulator is powered by a dedicated power supply input
V
PC
. Digital circuitry is separately powered by a digital
power supply V
DD
.
With its embedded LDO regulator, the 73S8024RN is a
cost effective solution for any application where a 5V
(typically -5% +10%) power supply is available.
Hardware support for auxiliary I/O lines, C4 / C8 contacts,
is provided*.
Emergency card deactivation is initiated upon card
extraction or upon any fault generated by the protection
circuitry. The fault can be a card over-current, a V
DD
(digital power supply)**, a V
PC
(regulator power supply), a
V
CC
(card power supply) or an over-heating fault.
The card over-current circuitry is a true current detection
function, as opposed to V
CC
voltage drop detection, as
usually implemented in ICC interface ICs.
The V
DD
voltage fault has a threshold voltage that can be
adjusted with an external resistor or resistor network. It
allows automated card deactivation at a customized V
DD
voltage threshold value. It can be used, for instance, to
match the system controller operating voltage range.
APPLICATIONS
• Set-Top-Box Conditional Access and Pay-per-
View
• Point of Sales and Transaction Terminals
• Control Access and Identification
* Pins/functions not available on 20-pin QFN package.
** User V
DD_FLT
threshold configuration not available on
20-pin QFN package.
ADVANTAGES
• Traditional step-up converter is replaced by a LDO
regulator:
Greatly reduced power dissipation
Fewer external components are required
Better noise performance
High current capability (90mA supplied to the card)
• SO28 package is pin-to-pin compatible with
industry-standard TDA8004 and TDA8024
• Card clock STOP (high and low) mode
• Small format (4x4x0.85mm) 20QFN package option
• True card over-current detection
FEATURES
• Card Interface:
Complies with ISO 7816-3, EMV 4.0, and NDS
An LDO voltage regulator provides 3V / 5V to the
card from an external power supply input
Provides at least 90mA to the card
ISO 7816-3 Activation / Deactivation sequencer with
emergency automated deactivation on card removal
or fault detected by the protection circuitry
Protection includes 3 voltage supervisors that detect
voltage drops on V
CC
(card), V
DD
(digital)**, and V
PC
(regulator) power supplies
The V
DD
voltage supervisor threshold value can be
externally adjusted**
Over-current detection 150mA max
Card clock stop high or low*
2 card detection inputs, 1 for each possible user
polarity
Auxiliary I/O lines, for C4 / C8 contact signals*
Card CLK clock frequency up to 20MHz
• System Controller Interface:
3 D
igital inputs control the card activation /
deactivation, card reset and card voltage
4 Digital inputs control the card clock (division rate
and card clock stop modes)
1 Digital output, interrupt to the system controller,
allows the system controller to monitor the card
presence and faults.
Crystal oscillator or host clock, up to 27MHz
• Regulator Power Supply:
4.75V to 5.5V (EMV 4.0)
4.85V to 5.5V (NDS)
• Digital Interfacing: 2.7V to 5.5V
• ±6kV ESD Protection on the card interface
• Package: SO28, 20QFN or 32QFN
