Pin-for-pin compatible -- with one external component swap -- with popular TDA8004 and TDA8024 devices, the mixed signal IC provides a stable, low-noise interface implemented as dedicated digital I/Os compliant with the ISO-7816 standard between any host microcontroller and a smart card. In operation, the new 73S8024R smart cart interface IC translates the digital signals from the host to analog signals recognized by the smart card, and vice versa. This device also provides a stable 3V or 5V VCC power source to the smart card from an on-chip low drop-out voltage regulator, yielding a 10x improvement in noise performance over other solutions in the marketplace that employ step-up DC-DC converters. Use of the LDO regulator also results in much smaller die size and fewer external components than the devices they are designed to replace, leading to lower the overall card interface costs, without requiring smart card terminal redesign. Doucet noted that the new TDK Semiconductor 73S8024R smart card interface IC would find immediate application in existing Set-Top Boxes, Digital TVs and Personal Video Recorders for conditional access to audio/video content, pay-per-view events or movies and other premium services. Smart Card Interfaces The new TDK Semiconductor 73S8024R smart card interface IC supports ISO-7816-3 and EMV-2000 (EMV4.0) electrical requirements and is the most protected device of its class in the market. Additional card protection features are provided to guard against hardware faults and guarantee emergency card deactivation in the event of card extraction, card over-current, supply voltage failure, LDO regulator failure and device overheating. Supply voltage fault can optionally be adjusted to match same operating voltage range as the host microcontroller. Other on-chip resources include a crystal oscillator and circuitry for card clock generation up to 20MHz; an LDO voltage regulator capable of supplying a high current of up to 90mA; and a complete set of buffers for data I/O. Only a single external capacitor is required for operation. Availability The new 73S8024R smart card interface IC is available off-the-shelf in a SO28 package and can be used as a pin-for-pin replacement in current designs using the TDA8004 and TDA8024.
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