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LTC1955

Features: · Compatible with ISO7816-3 and EMV Electrical Specifications· Power Management and Control for Two Smart Cards· Control/Status Serial Port May be Daisy-Chained for Multicard Applications· Automatic Shutdown on Electrical Faults· Buck/Boost Charge Pump Generates 5V, 3V or 1.8V Outputs (S...

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SeekIC No. : 004401959 Detail

LTC1955: Features: · Compatible with ISO7816-3 and EMV Electrical Specifications· Power Management and Control for Two Smart Cards· Control/Status Serial Port May be Daisy-Chained for Multicard Applications·...

LTC1955 Data Sheet

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Part Number:
LTC1955
Supply Ability:
5000

Price Break

  • Qty
  • 1~5000
  • Unit Price
  • Negotiable
  • Processing time
  • 15 Days
Total Cost: $ 0.00

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Upload time: 2024/11/21

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Product Details

Description



Features:

· Compatible with ISO7816-3 and EMV Electrical Specifications
· Power Management and Control for Two Smart Cards
· Control/Status Serial Port May be Daisy-Chained for Multicard Applications
· Automatic Shutdown on Electrical Faults
· Buck/Boost Charge Pump Generates 5V, 3V or 1.8V Outputs (Smart Card Classes A, B and C)*
· Independent 5V/3V/1.8V Level Control for Both Cards
· Automatic Level Translation
· Supervisory Functions Prevent Smart Card Faults
· Low Operating Current: 250mA Typical
· Ultralow Shutdown Current
· >10kV ESD on Smart Card Pins
· Small 32-Pin 5mm × 5mm QFN Package


Application

· Handheld Payment Terminals
·Pay Telephones
· ATM Machines
· POS Terminals
· Computer Keyboards
· Multiple S.A.M. Sockets


Pinout

Connection Diagram


Specifications

VBATT, DVCC, CPO, FAULT,
UNDERV to GND .................................. 0.3V to 6.0V
PRES A/PRES B, DATA, RIN, SYNC, ASYNC,
LD, DIN, SCLK to GND .............0.3V to (DVCC + 0.3V)
I/O A ...................................... 0.3V to (VCCA + 0.3V)
I/O B ...................................... 0.3V to (VCCB + 0.3V)
IVCCA/IVCCB ....................................................... 80mA
VCCA/VCCB Short-Circuit Duration .................. Indefinite
Operating Ambient Temperature Range
    (Note 4) ............................................... 40 to 85
Storage Temperature Range ................... 65to 125


Description

The LTC®1955 provides all necessary supervisory and power control functions for two smart cards, two S.A.M. cards or a combination of S.A.M. and smart cards. It provides a charge pump for battery powered applications as well as all necessary level shifting circuitry.

The card voltages can be independently set to 1.8V, 3V or 5V. Both card interfaces include a card detection channel with automatic debounce circuitry. To reduce wiring costs, the LTC1955 interfaces to a microcontroller via a simple 4-wire serial interface. Multiple devices may be connected in daisy-chain fashion so that the number of wires to the card socket board is independent of the number of sockets. Status data is returned over the same interface.

Extensive security features ensure proper deactivation sequencing in the event of a supply fault or a smart card electrical fault. The smart card pins can withstand greater than 10kV ESD in-situ with no additional components. The LTC1955 is available in a small 5mm× 5mm QFN package.




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