STMicroelectronics ST8034ATDT

Overview

ST8034ATDT 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 5 V/3 V card supply (VCC), integrated crystal oscillator or external clock input, and synchronous 20 MHz card clock generation via CLKDIV pin. It delivers thermal/short-circuit protection on all card contacts and supports automatic card activation/deactivation sequences in set-top box and banking readers.

For engineers reviewing the ST8034ATDT datasheet, ST8034ATDT pinout, ST8034ATDT application, or ST8034ATDT equivalent, key selection criteria include VCC slew rate control (0.055–0.300 V/µs), dual-supply monitoring (VDD, VDDP, VDD(INTF)), OFF interrupt signaling, I/OUC microcontroller data line with 10 kΩ pull-up, and SO16 package compatibility for legacy smartcard reader designs.

Technical Context

The ST8034ATDT integrates an internal LDO-based VCC generator with controlled rise/fall times and overload detection, supporting 5 V or 3 V smartcard supply with glitch-immune voltage supervision on VDD, VDDP, and VDD(INTF) pins. Its clock circuit accepts either a 1–20 MHz crystal across XTAL1/XTAL2 or an external clock at XTAL1, with frequency division configured by the CLKDIV pin.

It implements a half-duplex buffered I/O line (C7) with 9 kΩ internal pull-up to VCC, non-inverted RST output driven by RSTIN, and debounced card presence detection at PRES. Emergency deactivation triggers on VCC short, card removal, or overheating - all monitored independently of host MCU control.

Key Specifications

Pinout & Package

ST8034ATDT uses a 16-lead SOIC package (3.9 × 9.9 mm body) with standard JEDEC MS-012AC footprint. 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 ST8034TDT, ST8034ATDT adds CLKDIV flexibility for dynamic clock scaling; compared with ST8034PQR, it trades 1.8 V support and QFN size for SO16 manufacturability and fixed 5 V/3 V simplicity - making it optimal for established, volume production readers.

Availability

ST8034ATDT is available at Aetrix Electronics and suitable for set-top box readers, EMV banking terminals, and electronic identification systems requiring stable component supply across multi-year production cycles.

Supply support for ST8034ATDT 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, Switzerland, designing and manufacturing microcontrollers, analog ICs, and smart power devices for industrial, automotive, and consumer markets.

The ST8034 series belongs to ST's secure interface product line, engineered specifically for ISO 7816-compliant smartcard readers in pay-TV, banking, and identity applications - emphasizing integration, certification readiness, and long-term supply stability.

FAQ

What is the maximum card clock frequency supported by ST8034ATDT?

The ST8034ATDT supports a maximum card clock frequency of 20 MHz, generated either from an internal crystal oscillator (1–20 MHz crystal on XTAL1/XTAL2) or an external clock source applied to XTAL1. Frequency division is controlled synchronously via the CLKDIV pin, ensuring glitch-free transitions between divisors without disrupting card communication.

Does ST8034ATDT support 1.8 V smartcards?

No, ST8034ATDT does not support 1.8 V smartcards. It provides selectable 5 V or 3 V VCC output only. The 1.8 V option is exclusive to the ST8034P variant, which includes the VCC_SEL pin for tri-state voltage selection. For 1.8 V compatibility, ST8034PQR in QFN16 package must be used instead.

How does the ST8034ATDT handle card removal during operation?

Upon card removal, ST8034ATDT detects the loss of card presence via the debounced PRES pin and initiates an emergency deactivation sequence: VCC is ramped down with controlled slew rate, CLK and RST are disabled, and the OFF pin asserts low to notify the host MCU. This sequence occurs autonomously without MCU intervention and includes thermal and short-circuit protection throughout.

Can ST8034ATDT operate with an external clock instead of a crystal?

Yes, ST8034ATDT can accept an external clock signal applied to the XTAL1 pin while leaving XTAL2 unconnected. The internal oscillator circuit bypasses the crystal path and uses the external signal directly. Clock frequencies from 1 MHz to 20 MHz are supported, and CLKDIV remains fully functional to divide this input synchronously for the card clock output.