Microchip Technology AT83C24B-PRTUM

Overview

AT83C24B-PRTUM from Microchip Technology is a smart card reader interface IC with integrated DC/DC converter, supporting ISO 7816, EMV2000, and GSM standards. It delivers programmable card supply voltages (5V ±5%, 3V ±0.2V, 1.8V ±0.14V), features 8 kV+ ESD protection on card I/O pins, and operates from 3V to 5.5V input with 4–48 MHz clock support. It is used in EFT/POS terminals and set-top boxes for secure, low-power smart card management.

For engineers reviewing the AT83C24B-PRTUM datasheet, AT83C24B-PRTUM pinout, AT83C24B-PRTUM application, or AT83C24B-PRTUM equivalent, key selection considerations include TWI-configurable voltage programming, hardware-activated card power sequencing, automatic reset transition timing control, CVCC over-current detection, and dual-package availability (SO28/QFN28) with industrial temperature range (−40°C to +85°C).

Technical Context

The AT83C24B-PRTUM integrates a high-efficiency step-up converter (80–98% efficiency) enabling 5V card supply from 3V input, and supports synchronous cards via C4/C8 contacts with automatic activation/deactivation sequences. Its TWI interface allows up to 8 devices on one bus using programmable A2/A1/A0 address bits (0x40–0x4E write addresses).

It implements dual-mode clock control: software-controlled CRST/CCLK timing with ART (Automatic Reset Transition) for precise ATR delay measurement, and transparent mode linking A1/RST and A2/CK directly to CRST/CCLK. Power monitoring includes POR, PFD, and shutdown-triggered deactivation on VCC or CVCC fault.

Key Specifications

Pinout & Package

AT83C24B-PRTUM is available in SO28 (JEDEC MS-012) and QFN28 (5×5 mm, 0.5 mm pitch) packages. Both packages share identical pin functions and electrical characteristics.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SLB9670 and ST8020, the AT83C24B-PRTUM uniquely combines programmable card voltage generation, hardware-accelerated ART timing, and 8 kV+ card-side ESD in a single package - making it optimal for cost-constrained, standards-compliant contact-only readers where bill-of-material reduction and certification speed are critical.

Availability

AT83C24B-PRTUM is available at Aetrix Electronics and suitable for EFT/POS terminals, set-top box conditional access modules, and government ID card readers requiring stable component supply across long product lifecycles.

Supply support for AT83C24B-PRTUM 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

Microchip Technology is a global semiconductor company specializing in microcontrollers, analog devices, and security ICs, with broad expertise in secure transaction and embedded connectivity solutions.

The AT83C24B-PRTUM belongs to Microchip's Smart Card Interface family, designed specifically for low-power, standards-compliant smart card reader/writer applications in financial, broadcast, and identity markets.

FAQ

What is the minimum clock frequency required for AT83C24B-PRTUM operation?

The AT83C24B-PRTUM supports a clock input range of 4–48 MHz. For normal operation, 4 MHz is sufficient; however, the step-up converter requires a minimum of 7 MHz. Note that NDS-certified configurations (e.g., AT83C24NDS) mandate ≥18 MHz - but this requirement does not apply to the AT83C24B-PRTUM itself.

Does AT83C24B-PRTUM support both contact and contactless smart cards?

No. The AT83C24B-PRTUM is a contact-only smart card interface IC compliant with ISO 7816-3. It supports synchronous cards via C4 and C8 contacts but does not integrate ISO 14443 or any RF front-end circuitry. Contactless functionality requires a separate reader IC such as ST8020 or PN5180.

How does AT83C24B-PRTUM handle card power-down modes?

The AT83C24B-PRTUM supports card clock stop in high or low states via TWI command, enabling true ISO 7816 power-down. During stop mode, CVCC remains active, and the card enters low-power state. Automatic deactivation occurs on card extraction, over-current, or software SHUTDOWN - with controlled 7-step timing sequence.

Can AT83C24B-PRTUM be used in NDS-certified set-top boxes?

No - only the AT83C24NDS variant is NDS-approved. While the AT83C24B-PRTUM shares the same core architecture and most registers, it lacks the mandatory 18 MHz minimum clock requirement and specific capacitor constraints (e.g., 10 µF CVCC vs. 3.3 µF for NDS). Using AT83C24B-PRTUM in NDS systems voids certification.

What is the function of the CMDVCC pin on AT83C24B-PRTUM?

The CMDVCC pin on AT83C24B-PRTUM initiates hardware activation: a falling edge triggers automatic DC/DC startup, CVCC voltage selection (based on A0/3V), and CCLK/CRST enablement. It is not a power supply pin - it is a control signal tied to host GPIO and must be pulled high during idle to prevent unintended activation.