73S8023C
Smart Card Interface
Simplifying System Integration™
DATA SHEET
April 2009
Rev. 1.5 © 2009 Teridian Semiconductor Corporation 1
DESCRIPTION
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 card clock 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.
The 73S8023C requires only a single 2.7 V to 3.6 V power
supply, and features a high-efficiency embedded DC-DC
converter. 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…).
ADVANTAGES
• Supports both synchronous and asynchronous smart
cards
• Replacement for TDA8002, with up to 600 mW in
power savings (@ EMV ICCmax condition) !
• The inductor-based DC-DC converter provides higher
current and efficiency
Ideal for battery-powered applications
Suitable for high current cards and SAMs: (100 mA
max)
Single 2.7 V to 3.6 V power supply allows removal
of 5 V from the system
• Power down mode: 2 µA typical
• Package: Small Format (5x5mm) 32-QFN
FEATURES
• Card Interface:
Complies with ISO-7816-3, EMV 4.0
A DC-DC Converter provides 3V / 5V to the card
from an external power supply input
High-efficiency converter: > 80% @ V
DD
=3.3 V,
V
CC
=5 V and I
CC
Up to 100 mA supplied to the card
= 65 mA
ISO-7816-3 Activation / Deactivation sequencer
with emergency automated deactivation
Protection includes 2 voltage supervisors which
detect voltage drops on card V
CC
and on V
DD
The V
power supply
DD
True over-current detection (150 mA max.)
voltage supervisor threshold value can be
externally adjusted
2 card detection inputs, 1 for either possible switch
configuration
Full support of synchronous cards
• System Controller Interface:
3 Digital inputs control the card activation /
deactivation, card reset and card voltage
3 Digital inputs control the card clock (division rate
and card clock source selection)
1 Digital output, interrupt to the system controller,
allows the system controller to monitor the card
presence and faults
1 Power down digital input (places the 73S8023C
in a very low-power mode (card deactivated)
1 Chip select digital input for parallel operation of
several 73S8023C ICs.
1 External clock input (STROBE), used for
synchronous operation
1 Digital output clock, buffered version of signal on
XTALIN
Crystal oscillator or host clock (XTALIN), up to
27 MHz
• Power Supply: V
DD
• 6 kV ESD Protection on the card interface
2.7 V to 3.6 V
APPLICATIONS
• Point of Sales and Transaction Terminals
• Payphones
• Set-Top-Boxes, DVD / HDD Recorders
• Payment card interfaces in portable devices (PDAs,
mobile phones…)
