LTC1756EGN#PBF

Specialized Overview

The LTC1756EGN#PBF is a smart card interface IC compliant with ISO 7816-3 and EMV specifications. It features an internal buck-boost charge pump generating regulated 3V or 5V outputs for the smart card. The device operates within a 2.7V to 6.0V input voltage range, drawing 75mA typical active current and less than 2.5mA in shutdown. It includes dynamic pull-ups for fast signal rise times, soft-start functionality, and overtemperature protection. The component is housed in a 16-lead narrow plastic SSOP package.

Specialized Feature Summary

• Fully compliant with ISO 7816-3 and EMV standards including auxiliary I/O support
• Internal buck-boost charge pump provides regulated 3V or 5V supply
• High ESD protection rating exceeding 10kV on all smart card pins
• Dynamic pull-up circuits deliver fast signal rise times while minimizing static power consumption

Specialized Applications

• Handheld payment terminals
• Pay telephones
• ATMs
• Key chain readers
• Smart card readers

Specialized Procurement Notes

Verify the specific ordering suffix against official Analog Devices documentation to confirm package type and temperature grade. Ensure compatibility with system voltage requirements before procurement. Confirm availability through authorized distributors as supply status may vary. Cross-reference datasheet revisions to ensure design continuity.

Specialized Selection Notes

Select this model when a single-channel smart card interface is required without auxiliary I/O capabilities found in the LTC1755 variant. Verify that the 16-pin SSOP package fits the PCB layout constraints. Ensure the host microcontroller logic levels are compatible with the DVCC reference voltage provided by the VIN pin.

Specialized Part Context

This component belongs to the LTC1755/LTC1756 family of universal smart card interfaces. While the LTC1755 offers additional auxiliary I/O channels and configurable switch detection in a 24-pin package, the LTC1756 provides a simplified 16-pin solution optimized for space-constrained applications requiring standard smart card connectivity.

Specialized Replacement Considerations

LTC1755EGN#PBF (offers expanded I/O in 24-pin SSOP)

Specialized FAQ

How does the LTC1756 handle bidirectional data transmission?

The DATA pin supports half-duplex bidirectional transmission. The direction is established by the first side to drive a low signal; once established, transmission back to the input side is inhibited until both sides return high.

What determines the VCC output voltage level?

The 5V/3V input pin controls the output voltage. A valid high sets VCC to 5V, while a valid low sets it to 3V. This setting is latched on the falling edge of the PWR pin.

How is fault detection managed in the LTC1756?

The READY pin indicates fault conditions. If faults such as VCC underrange, overtemperature, or invalid CLK/RST levels occur, the device enters an Alarm state, causing the READY pin to go high.