LTC1755

PRODUCTION

LTC1755

Smart Card Interface

PRODUCTION

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Part Models 2

1ku List Price Starting From $3.75

Features

Fully ISO 7816-3 and EMV Compliant (Including Auxiliary I/O Pins)
Buck-Boost Charge Pump Generates 3V or 5V
2.7V to 6.0V Input Voltage Range (LTC1755)
Very Low Operating Current: 60µA
>10kV ESD on All Smart Card Pins
Dynamic Pull-Ups Deliver Fast Signal Rise Times
Soft-Start Limits Inrush Current at Turn On
3V ↔ 5V Signal Level Translators
Shutdown Current: <1µA
Short-Circuit and Overtemperature Protected
Alarm Output Indicates Fault Condition
Multiple Devices May Be Paralleled for Multicard Applications (LTC1755)
Available in 16- and 24-Pin SSOP Packages

Additional Details

The LTC1755/LTC1756 universal Smart Card interfaces are fully compliant with ISO 7816-3 and EMV specifications. The parts provide the smallest and simplest interface circuits between a host microcontroller and general purpose Smart Cards.

An internal charge pump DC/DC converter delivers regulated 3V or 5V to the Smart Card, while on-chip level shifters allow connection to a low voltage controller. All Smart Card contacts are rated for 10kV ESD, eliminating the need for external ESD protection devices.

Input voltage may range from 2.7V to 6.0V, allowing direct connection to a battery. Internal soft-start mitigates start-up problems that may result when the input power is provided by another regulator. Multiple devices may be paralleled and connected to a single controller for multicard applications.

Battery life is maximized by 60µA operating current and 1µA shutdown current. The narrow SSOP packages minimize PCB area for compact portable systems.

Applications

Handheld Payment Terminals
Pay Telephones
Key Chain Readers
Smart Card Readers