NXP Semiconductors TDA8034AT/C1,112

Overview

TDA8034AT/C1,112 from NXP Semiconductors is a smart card interface IC in SO16 package that provides regulated 3 V or 5 V card supply (VCC), protected bidirectional I/O (C7), and ISO 7816-compliant clock/reset generation up to 20 MHz. It integrates thermal/short-circuit protection, ESD >6 kV on card pins, and automatic activation/deactivation sequencing for secure payment terminals and bank card readers.

For engineers reviewing the TDA8034AT/C1,112 datasheet, TDA8034AT/C1,112 pinout, TDA8034AT/C1,112 application, or TDA8034AT/C1,112 equivalent, key selection criteria include VCC regulation accuracy (±5 %), CLKDIV1-selectable clock output (fxtal or ½fxtal), built-in debouncing (4.5 ms), and dual-supply operation (VDD = 2.7–3.6 V, VDDP = 4.85–5.5 V).

Technical Context

The TDA8034AT/C1,112 implements an integrated LDO-based VCC regulator with overload detection (~120 mA threshold) and filtered response to current spikes up to 200 mA. Its clock circuitry supports both external clock input (up to 26 MHz on XTAL1) and crystal oscillator (2–26 MHz), with automatic source detection triggered on each CMDVCCN falling edge.

It features dual-domain I/O transceivers: card-side I/O referenced to VCC (with 7–11 kΩ pull-up) and controller-side I/OUC referenced to VDD(INTF), enabling asymmetric voltage operation (e.g., VCC = 5 V, VDD(INTF) = 3.3 V). Activation/deactivation sequences are fully hardware-controlled with precise timing (tdeact = 35–250 µs) and fault-triggered emergency shutdown.

Key Specifications

Pinout & Package

Package: SO16 (SOT109-1), plastic small outline, 16 leads, 3.9 mm body width.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SLB9670TT2.0 and ST8024, the TDA8034AT/C1,112 uniquely combines 20 MHz programmable clock generation, hardware-based 4.5 ms debounce, and >6 kV HBM ESD on card pins - making it optimal for certified EMV 4.2 and Pay TV deployments requiring zero firmware overhead for card sequencing.

Availability

TDA8034AT/C1,112 is available at Aetrix Electronics and suitable for Pay TV conditional access modules, EMV payment terminals, and government eID readers requiring stable component supply across extended product lifecycles.

Supply support for TDA8034AT/C1,112 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 core expertise in smart card, NFC, and trusted execution technologies.

The TDA8034AT/C1,112 belongs to NXP's smart card interface product line, engineered specifically for ISO 7816-compliant reader designs requiring integrated power, protection, and timing - targeting high-reliability financial and identity applications.

FAQ

What is the maximum clock frequency supported by TDA8034AT/C1,112 on the CLK pin?

The TDA8034AT/C1,112 supports a maximum clock frequency of 20 MHz on the CLK pin. This is achieved when CLKDIV1 is set LOW to select fxtal mode, and the external crystal or clock input (XTAL1) operates at 20 MHz. The device guarantees 45–55 % duty cycle and ≤16 ns rise/fall times under 30 pF load, meeting ISO 7816-3 timing requirements for high-speed asynchronous protocols.

How does TDA8034AT/C1,112 automatically select between 3 V and 5 V card supply?

The TDA8034AT/C1,112 determines card voltage by measuring the duration of the HIGH state on CMDVCCN before its falling edge: if >30 ms, it activates at 5 V; if <15 ms, at 3 V. For intermediate durations (15–30 ms), a specific LOW-HIGH-LOW pulse sequence on CMDVCCN is required. This auto-selection is implemented entirely in hardware with no MCU firmware dependency.

Does TDA8034AT/C1,112 require external capacitors for VCC decoupling, and what values are specified?

Yes, the TDA8034AT/C1,112 requires two low-ESR multilayer ceramic capacitors for VCC decoupling: one 470 nF capacitor placed close to pin VCC, and one 220 nF capacitor placed near the card socket contact C1. These values are mandatory to meet ripple specification (<350 mV peak-to-peak, 20 kHz–200 MHz) and ensure stable 5 V or 3 V regulation under dynamic card load conditions.

What protection features are integrated into TDA8034AT/C1,112 for smart card reliability?

The TDA8034AT/C1,112 integrates thermal protection, short-circuit detection on all card contacts (C1–C8), >6 kV HBM ESD on card pins, and filtered overload detection (~120 mA threshold on VCC). It also includes a supply supervisor with POR and dropout detection on VDDP/VDD, plus hardware-enforced activation/deactivation sequences to prevent card damage during hot insertion or power loss.

Is TDA8034AT/C1,112 pin-compatible with the TDA8034T/C1 version?

No, the TDA8034AT/C1,112 is not pin-compatible with the TDA8034T/C1. While both share identical SO16 pinout and package, their CLKDIV1 functionality differs: TDA8034AT supports fxtal or ½fxtal outputs, whereas TDA8034T supports only ½fxtal or ¼fxtal. Substituting them requires firmware updates to CLKDIV1 control logic and validation of clock timing margins in the target application.