STMicroelectronics ST8034TDT

Overview

ST8034TDT from STMicroelectronics is a 16-pin smartcard interface IC compliant with ISO 7816 and EMV™ 4.3 standards, providing complete analog card control including programmable VCC (5 V or 3 V), integrated crystal oscillator or external clock input, and thermal/short-circuit protection on all card contacts. It delivers controlled VCC rise/fall times (0.055–0.300 V/µs), supports up to 20 MHz card clock frequency, and operates across –25 °C to +85 °C for banking and pay-TV readers.

For engineers reviewing the ST8034TDT datasheet, ST8034TDT pinout, ST8034TDT application, or ST8034TDT equivalent, this device serves as a fully integrated, single-chip solution for secure microcontroller-to-smartcard interfacing - requiring no external voltage regulators, clock buffers, or protection diodes in standard implementations.

Technical Context

The ST8034TDT integrates an LDO-based VCC generator with glitch-immune overload detection, dual-supply supervision (VDD, VDDP, VDD(INTF)), and synchronous CLKDIV-controlled clock division enabling precise 20 MHz card clock generation. Its internal I/O transceiver features a 9 kΩ pull-up to VCC and ESD-hardened card-side pins (8 kV HBM).

It implements automatic activation/deactivation sequences triggered by CMDVCC, with emergency shutdown on VDD/VDDP/VDD(INTF) undervoltage, card take-off, or thermal fault. The OFF pin provides debounced status signaling to the host MCU, while RSTIN directly drives non-inverted RST output to the card.

Key Specifications

Pinout & Package

ST8034TDT uses a 16-lead SOIC package (3.9 × 9.9 mm body, 1.27 mm pitch) with exposed pad not connected. Pin functions are defined per Table 2 of ST's DocID024587 Rev 4.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ST8034ATDT, ST8034TDT simplifies clock configuration with binary-only CLKDIV (/1, /2, /4, /8), reducing firmware complexity; unlike MAX3232ESE+, it delivers full ISO 7816 analog layer functionality - making it the only drop-in capable replacement among listed parts.

Availability

ST8034TDT is available at Aetrix Electronics and suitable for banking terminals, pay-TV set-top boxes, and identification access systems requiring stable component supply across extended product lifecycles.

Supply support for ST8034TDT 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

STMicroelectronics is a global semiconductor leader headquartered in Geneva, specializing in automotive, industrial, and smartcard interface solutions with over 30 years of secure transaction IC expertise.

The ST8034 series belongs to ST's dedicated smartcard analog interface product line, engineered specifically to replace multi-component discrete designs in EMV™-certified payment and identity systems.

FAQ

What is the maximum allowable VDDP voltage when operating ST8034TDT in 3 V VCC mode?

Per Table 7 in DocID024587 Rev 4, VDDP must be between 3.0 V and 5.5 V when VCC = 3 V. The minimum valid value is 3.0 V, and exceeding 5.5 V risks permanent damage per absolute maximum ratings (Table 4). Operation at 4.5 V is typical for margin and thermal headroom.

Can ST8034TDT drive a 20 MHz clock directly to the card without external components?

Yes - ST8034TDT generates up to 20 MHz card clock internally using its integrated oscillator (with external crystal) or accepts external clock via XTAL1. No buffer, level shifter, or termination resistor is required; CLK output drives C3 contact directly per ISO 7816-3 timing specs.

How does the OFF pin behave during card insertion and removal?

OFF is an active-low, open-drain interrupt output with internal 20 kΩ pull-up to VDD(INTF). It asserts low on card insertion (after PRES debounce), remains low during active use, and pulses low again during emergency deactivation (e.g., VCC short or thermal fault), per Figure 14 and Section 6.7.

Is external decoupling required on the VCC pin, and what values are specified?

Yes - two low-ESR ceramic capacitors are mandatory: 100 nF ±20% (up to 330 nF ±20%) placed close to the ST8034TDT, plus a bulk capacitor of 160–530 nF total (Table 7, CVCC). This ensures stable VCC regulation and meets EMV™ transient response requirements during current pulses.