NXP Semiconductors TDA8034AT/C1,118

Overview

TDA8034AT/C1,118 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 bank card readers and pay-TV conditional access modules.

For engineers reviewing the TDA8034AT/C1,118 datasheet, TDA8034AT/C1,118 pinout, TDA8034AT/C1,118 application, or TDA8034AT/C1,118 equivalent, key selection criteria include VCC regulation accuracy (±5 %), CLKDIV1-controlled synchronous clock division (fxtal or ½fxtal), built-in 4.5 ms PRESN debouncing, and dual-supply operation (VDDP = 4.85–5.5 V, VDD = 2.7–3.6 V).

Technical Context

The TDA8034AT/C1,118 implements a dedicated smart card power and signal interface with integrated LDO-based VCC regulation (4.75–5.25 V for 5 V cards, 2.85–3.15 V for 3 V cards), programmable clock generation via CLKDIV1 (fxtal or ½fxtal), and fault-triggered emergency deactivation on short-circuit, card removal, or overtemperature. Its sequencer enforces strict timing for ISO 7816 activation (td(end) ≈ 90 μs) and deactivation (tdeact = 35–250 μs).

It supports external clock input up to 26 MHz on XTAL1 or crystal oscillator (2–26 MHz) between XTAL1/XTAL2, with automatic source detection. Card-side I/O transceiver uses active pull-up (7–11 kΩ to VCC) enabling >1 mA drive at 0.9VCC into 80 pF, while interface-side I/OUC operates referenced to VDD(INTF) with 8–12 kΩ pull-up to VDD(INTF).

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 SLB9670 and TDA8029, the TDA8034AT/C1,118 uniquely combines 3 V/5 V auto-sensing, programmable clock division (fxtal or ½fxtal), >6 kV ESD, and integrated VCC LDO - making it the only option meeting modern EMV 4.2, NDS, and ISO 7816-3 requirements in a single SO16 package.

Availability

TDA8034AT/C1,118 is available at Aetrix Electronics and suitable for bank card readers, pay-TV conditional access modules, and electronic payment terminals requiring stable component supply across industrial temperature range (−25 °C to +85 °C) and long lifecycle support.

Supply support for TDA8034AT/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 headquarters in Eindhoven, Netherlands.

The TDA8034AT/C1,118 belongs to NXP's smart card interface product line, engineered specifically for ISO 7816-compliant payment, identification, and conditional access systems requiring integrated power, protection, and timing functions.

FAQ

What is the maximum clock frequency supported by TDA8034AT/C1,118 on pin CLK?

The TDA8034AT/C1,118 supports a maximum clock frequency of 20 MHz on pin CLK. This is achieved when CLKDIV1 is set LOW to select fxtal mode, and an external crystal or clock source up to 26 MHz is applied to XTAL1. The device guarantees 45–55 % duty cycle and <16 ns rise/fall times (CL = 30 pF), ensuring reliable timing for ISO 7816 synchronous protocols. The TDA8034AT/C1,118 does not support frequencies above 20 MHz on CLK regardless of XTAL1 input.

How does TDA8034AT/C1,118 automatically determine whether to supply 3 V or 5 V to the smart card?

The TDA8034AT/C1,118 determines card supply voltage by measuring the duration that CMDVCCN remains HIGH before its falling edge. If CMDVCCN stays HIGH for >30 ms, VCC is set to 5 V; if <15 ms, VCC is set to 3 V. For intermediate durations (15–30 ms), a specific pulse sequence (LOW for 200–700 μs, then HIGH for 200 μs–15 ms) is required to select 3 V mode. This auto-sensing eliminates external configuration resistors or firmware overhead in the host microcontroller for the TDA8034AT/C1,118.

What protection features does TDA8034AT/C1,118 provide for smart card contacts?

The TDA8034AT/C1,118 provides thermal protection (shutdown at >125 °C junction temperature), short-circuit protection on VCC (120 mA threshold with filtered detection), and >6 kV HBM ESD protection on all card-contact pins (I/O, RST, VCC, CLK, PRESN). It also includes built-in debouncing (4.5 ms typical) on PRESN and automatic deactivation on card removal, overheating, or supply drop-out. These protections are implemented in hardware and require no external components for the TDA8034AT/C1,118.

Can TDA8034AT/C1,118 operate with a 3.3 V microcontroller while powering a 5 V smart card?

Yes, the TDA8034AT/C1,118 supports mixed-supply operation: VDD = 2.7–3.6 V (typically 3.3 V) powers the digital interface logic, while VDDP = 4.85–5.5 V feeds the internal LDO to generate regulated 5 V on VCC for the smart card. VDD(INTF) can be independently set from 1.6 V to (VDD + 0.3) V, allowing level-shifting between 3.3 V microcontrollers and 5 V card signaling - all managed internally without external level shifters for the TDA8034AT/C1,118.

What is the purpose of the OFFN pin on TDA8034AT/C1,118, and how is it used?

The OFFN pin on TDA8034AT/C1,118 is an active-LOW NMOS open-drain interrupt output that signals card presence (HIGH when card inserted) or fault conditions (LOW on short-circuit, overheating, or supply dropout). During normal operation, OFFN goes HIGH after 4.5 ms debounce when PRESN goes LOW, and returns LOW during emergency deactivation. Host microcontrollers monitor OFFN to trigger session start/stop without polling PRESN, reducing firmware complexity and improving real-time response for the TDA8034AT/C1,118.