NXP Semiconductors TDA8034T/C1,118

Overview

TDA8034T/C1,118 from NXP Semiconductors is a smart card interface IC in SO16 package that provides regulated 5 V or 3 V supply, protected bidirectional I/O (C7), thermal/short-circuit protection, and ISO 7816-compliant clock/reset generation for synchronous/asynchronous cards. It integrates LDO regulation, ESD protection >6 kV, and automatic activation/deactivation sequences - deployed in bank card readers and EMV 4.2 payment terminals.

For engineers reviewing the TDA8034T/C1,118 datasheet, TDA8034T/C1,118 pinout, TDA8034T/C1,118 application, or TDA8034T/C1,118 equivalent, key selection criteria include VCC regulation accuracy (±5 %), CLK frequency support up to 20 MHz, built-in debouncing (4.5 ms), fault detection on VDDP/VDD drop, and compatibility with 3 V/5 V card voltage auto-detection via CMDVCCN timing.

Technical Context

The TDA8034T/C1,118 implements an integrated analog interface with dual-supply architecture: VDDP (5 V LDO input), VDD (3.3 V digital core), and VDD(INTF) (3.3 V interface rail). Its internal sequencer executes controlled activation/deactivation using timed transitions (e.g., tdeact = 35–250 µs), synchronized to internal oscillator frequencies of 100–200 kHz (shutdown) or 2–3.2 MHz (active).

It supports two clock sources - external clock up to 26 MHz on XTAL1 or crystal oscillator (2–26 MHz across XTAL1/XTAL2) - with automatic source detection and synchronous CLKDIV1-controlled division (1/2 fxtal or 1/4 fxtal for TDA8034T). The I/O transceiver uses active pull-up (7–11 kΩ to VCC) and limits card-side current to 15 mA at ≤1 MHz.

Key Specifications

Pinout & Package

Package: SO16 plastic small outline package (SOT109-1), 16-pin, 3.9 mm body width, lead pitch 1.27 mm.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar smart card interface applications.

Compared with SLB9670 and TDA8029T, the TDA8034T/C1,118 uniquely combines 3 V/5 V auto-sensing, integrated LDO, 20 MHz CLK generation, and >6 kV ESD in a single SO16 package - delivering full ISO 7816-3 compliance without external support circuitry.

Availability

TDA8034T/C1,118 is available at Aetrix Electronics and suitable for bank card readers, EMV payment terminals, and government ID verification systems requiring stable component supply, long-term lifecycle assurance, and automotive-grade reliability under −25 °C to +85 °C operation.

Supply support for TDA8034T/C1,118 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

NXP Semiconductors is a global semiconductor leader specializing in secure connectivity solutions for automotive, industrial, and identification markets, with deep expertise in smart card and secure element technologies.

The TDA8034T/C1,118 belongs to NXP's smart card interface product line, engineered specifically for EMV-compliant, low-cost, high-reliability contact-based payment and identity systems - emphasizing integrated protection, minimal external components, and seamless ISO 7816 interoperability.

FAQ

What is the maximum clock frequency supported by the TDA8034T/C1,118 on pin CLK?

The TDA8034T/C1,118 supports a maximum clock frequency of 20 MHz on pin CLK. This is achieved when configured in TDA8034T mode with CLKDIV1 LOW (1⁄4 fxtal) and fxtal = 26 MHz, or with CLKDIV1 HIGH (1⁄2 fxtal) and fxtal = 20 MHz. The device guarantees 45–55 % duty cycle and ≤16 ns rise/fall times (CL = 30 pF), meeting ISO 7816-3 timing requirements for high-speed card communication. The TDA8034T/C1,118 datasheet confirms fCLK ≤20 MHz under all operating conditions.

How does the TDA8034T/C1,118 automatically detect whether a smart card requires 3 V or 5 V supply?

The TDA8034T/C1,118 detects card voltage requirement by measuring the duration that pin CMDVCCN remains HIGH before its falling edge. If CMDVCCN stays HIGH for >30 ms, the device activates with VCC = 5 V; if <15 ms, it activates with VCC = 3 V. For intermediate durations (15–30 ms), a specific LOW-HIGH pulse sequence on CMDVCCN is required. This logic is implemented in hardware - no firmware involvement - ensuring deterministic, repeatable voltage selection per ISO 7816-3 Annex A. The TDA8034T/C1,118 performs this detection autonomously during every activation.

Does the TDA8034T/C1,118 support external clock input, and what are the voltage and frequency limits?

Yes, the TDA8034T/C1,118 supports external clock input on pin XTAL1, with frequency range 0–26 MHz and input voltage levels defined by VIL ≤0.3×VDD(INTF) and VIH ≥0.7×VDD(INTF). The device automatically detects external clock presence during each CMDVCCN falling edge and disables the internal crystal oscillator accordingly. Duty cycle must be 48–52 %, and the external clock must be stable before CMDVCCN goes LOW. This capability allows system designers to eliminate crystals and reduce bill-of-materials while maintaining precise timing control for the TDA8034T/C1,118.

What protection features does the TDA8034T/C1,118 provide for smart card contacts?

The TDA8034T/C1,118 provides comprehensive protection for all card contacts (C1–C7): thermal shutdown, short-circuit detection on VCC with ~120 mA threshold, ESD >6 kV HBM on I/O, RST, VCC, CLK, and PRESN, and overload filtering tolerant of 200 mA spikes (≤few ms). Faults trigger immediate automatic deactivation - pulling RST LOW, stopping CLK, and discharging VCC - without host MCU intervention. These protections are hardware-enforced and validated across −25 °C to +85 °C, making the TDA8034T/C1,118 suitable for unattended public terminals where card abuse or environmental stress is common.

Is the TDA8034T/C1,118 pin-compatible with other members of the TDA80xx family, such as the TDA8034AT/C1?

No, the TDA8034T/C1,118 is not pin-compatible with the TDA8034AT/C1. While both share identical SO16 packaging and pin numbering, their CLKDIV1 functionality differs: TDA8034T supports 1⁄2 fxtal or 1⁄4 fxtal division, whereas TDA8034AT supports fxtal or 1⁄2 fxtal. This functional difference means firmware must be adapted for clock configuration, and direct substitution may cause incorrect CLK frequency. The TDA8034T/C1,118 datasheet explicitly defines its division ratios and warns against interchangeability without validation - confirming it is a distinct variant within the family, not a drop-in replacement.