ST8024LCDR

Specialized Overview

The ST8024LCDR is a smart card interface IC designed for asynchronous Class A, B, and C smartcards. It operates with a supply voltage range of 2.7 V to 6.5 V, supporting typical voltages of 3.3 V or 5 V. The device features a maximum clock frequency of 20 MHz and includes an integrated 26 MHz crystal oscillator. It provides three protected half-duplex bi-directional buffered I/O lines for card contacts C4, C7, and C8. The unit handles current spikes up to 20 MHz and offers thermal and short-circuit protection on all contacts. Maximum power dissipation is 560 mW, and it functions within a temperature range of -25 °C to 85 °C in a 28-pin SO package.

Specialized Feature Summary

• Integrated step-up converter generates regulated card supply voltage (VCC) from a separate 5 V ± 20% supply (VDDP).
• Enhanced electrostatic discharge (ESD) protection on the card side exceeding 6 kV.
• Automatic activation and deactivation sequences triggered by software or hardware events such as short-circuits or overheating.
• Built-in debounce functionality on card presence contacts.

Specialized Applications

• NDS conditional access systems
• EMV 4.2 payment systems
• ISO 7816 compliant devices
• GSM 11-11 compatible terminals

Specialized Procurement Notes

Verify the specific suffix against official documentation to confirm pinout and electrical characteristics, as variations exist within the family. Confirm RoHS compliance status through the manufacturer's latest datasheet or environmental declaration. Ensure the ordering quantity aligns with the tape and reel packaging requirements specified by STMicroelectronics for this surface-mount component.

Specialized Selection Notes

Select the ST8024LCDR when designing interfaces for asynchronous smartcards requiring Class A, B, or C compatibility. This part is suitable for applications needing integrated supply protection and control functions with minimal external components. Consider the 28-pin SO package constraints and the requirement for a separate 5 V supply for the step-up converter when evaluating system architecture.

Specialized Part Context

This component belongs to the ST8024L series of smart card interface ICs manufactured by STMicroelectronics. It serves as a low-cost analog interface solution positioned between the smartcard and the microcontroller. The device performs essential supply protection and control functions, simplifying the design of secure card reading systems while maintaining compatibility with major industry standards.

Specialized Replacement Considerations

The ST8024LCTR is noted as compatible with the ST8024LCDR, except for the Vth(ext)rise/fall value. Designers should verify these threshold differences if substituting parts to ensure signal integrity remains within acceptable limits for the specific application timing requirements.