LTC1755 - Smart Card Interface


  • 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

Typical Application

LTC1755 Typical Application


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.


CAD Symbols and Footprints: The downloadable Zip file below contains the schematic symbol and PCB footprints.

For complete and up to date package information and drawings, please refer to our packaging page

Part Number Package Code Temp Package
LTC1755EGN#PBF SSOP-24 GN E 05-08-1641 (GN24) Yes
LTC1755EGN#TRPBF SSOP-24 GN E 05-08-1641 (GN24) Yes

Order Info

  • Part numbers ending in PBF are lead free. Solder plated terminal finish (SnPb) versions are non-standard and special terms and conditions and pricing applies if available. Please contact LTC marketing for information.
  • Part numbers containing TR or TRM are shipped in tape and reel or 500 unit mini tape and reel, respectively
  • Please refer to our general ordering information or the product datasheet for more details

Package Variations and Pricing

Part Number Package Temp Price
LTC1755EGN#PBF SSOP-24 E $2.95 $2.55 Yes
LTC1755EGN#TRPBF SSOP-24 E $2.65 Yes
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* The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Linear Technology sales office or authorized distributor.

Demo Boards

Linear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.

Click here to view our complete list of demo boards


  • Handheld Payment Terminals
  • Pay Telephones
  • Key Chain Readers
  • Smart Card Readers

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