TDA8004AT/C1,112

Specialized Overview

The TDA8004AT/C1,112 is a complete analog interface for asynchronous 3 V or 5 V smart cards. It performs supply, protection, and control functions between the card and microcontroller with minimal external components. The IC features an integrated step-up converter for VCC generation, powered separately by a 5 V ± 10% supply (VDDP). It provides three protected half-duplex bidirectional buffered I/O lines (C4, C7, C8) and regulates VCC to 5 V or 3 V ± 5%. A 26 MHz integrated crystal oscillator supports clock generation up to 20 MHz via division factors of 1, 2, 4, or 8. The device operates within an ambient temperature range of -25 °C to +85 °C and is housed in an SO28 package.

Specialized Feature Summary

• Integrated step-up converter for generating regulated card supply voltage from a separate power rail
• Three specifically protected half-duplex bidirectional buffered I/O lines for card contact communication
• Built-in 26 MHz crystal oscillator with synchronous frequency division capabilities for clock generation
• Automatic activation and deactivation sequences triggered by software commands or hardware fault detection

Specialized Applications

• IC card readers for banking systems
• Electronic payment terminals
• Identification devices
• Pay TV set-top boxes

Specialized Procurement Notes

Verify component authenticity through authorized NXP Semiconductors distributors or certified partners. Request original manufacturer documentation and traceability records to confirm compliance with ISO 7816 standards. Ensure storage conditions meet specified humidity and temperature limits to prevent moisture sensitivity damage prior to soldering.

Specialized Selection Notes

Confirm that the system design accommodates the separate VDDP supply requirement for the internal step-up converter. Verify that the microcontroller logic levels align with the VDD supply voltage range of 2.7 V to 6.5 V. Ensure adequate decoupling capacitors with low ESR are placed near the IC pins to maintain signal integrity and meet ripple specifications.

Specialized Part Context

This component belongs to the TDA80xx series of contact smart card interface ICs from NXP Semiconductors. It serves as a foundational analog interface solution for managing power and data exchange with ISO/IEC 7816 compliant smart cards. The series is widely utilized in secure access and payment applications requiring robust card presence detection and fault protection.

Specialized Replacement Considerations

The TDA8024AT is documented as a direct replacement for the TDA8004AT. Verify pin compatibility and electrical parameter alignment before substitution.