LTC1755 Datasheet | Linear Technology

Features s Fully ISO 7816-3 and EMV pliant (Including Auxiliary I/O Pins) s Buck-Boost Charge Pump Generates 3V or 5V s 2.7V to 6.0V Input Voltage Range (LTC1755) s Very Low Operating Current: 60µA s > 10k V ESD on All Smart Card Pins s Dynamic Pull-Ups Deliver Fast Signal Rise Times s Soft-Start Limits Inrush Current at Turn On s 3V ↔ 5V Signal Level Translators s Shutdown Current: < 1µA s Short-Circuit and Overtemperature Protected s Alarm Output Indicates Fault Condition s Multiple Devices May Be Paralleled for Multicard Applications (LTC1755) s Available in 16- and 24-Pin SSOP Packages U APPLICATIO S s Handheld Payment Terminals s Pay Telephones s ATMs s Key Chain Readers s Smart Card Readers LTC1755/LTC1756 Smart Card Interface DESCRIPTIO The LTC®1755/LTC1756 universal Smart Card interfaces are fully pliant 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 10k V 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 startup 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 pact portable systems. , LTC and LT are registered trademarks of Linear Technology Corporation. TYPICAL APPLICATIO SMART CARD PRESENT SWITCH C3 10µF GND VCC AUX1 SMART CARD AUX2 I/O 3.3V C2 10µF 1 PRES 5V/3V 2 PWR CARD 3 CS ALARM 4 NC/NO READY GND DVCC 6 VIN LTC1755 C -...