Analog Devices Inc./Maxim Integrated DS8023-RJX+T&R

Overview

DS8023-RJX+T&R from Maxim Integrated is a smart card interface IC serving as an analog front-end between a host microcontroller and ISO 7816/EMV/GSM11-11 smart cards. It supports 5V, 3V, and 1.8V card voltages with integrated charge-pump power generation (5.0V ±5%, 80mA max), ultra-low stop-mode current (<10nA typ), and ±8kV IEC ESD protection on card interface pins - deployed in banking POS terminals, ATMs, and conditional access set-top boxes.

For engineers reviewing the DS8023-RJX+T&R datasheet, DS8023-RJX+T&R pinout, DS8023-RJX+T&R application, or DS8023-RJX+T&R equivalent, key selection considerations include its 28-pin TSSOP package, automatic activation/deactivation sequencer, flexible clock division (fXTAL/1, /2, /4, /8), and compatibility with TDA8024-based designs requiring minimal hardware changes.

Technical Context

The DS8023-RJX+T&R implements a dedicated internal sequencer for card activation (tACT = 160μs) and deactivation (tDEACT = 80μs), with synchronized voltage ramping and timing-controlled contact enablement. Its charge-pump architecture operates in 1x or 2x mode depending on VDDA and selected card voltage (e.g., 2x for VDDA < 5.8V when supplying 5V).

It integrates three identical bidirectional I/O transceivers (I/O, AUX1, AUX2) with 11kΩ internal pullups to VCC/VDD, active low-to-high pullup (tPU = 100ns), and ±15mA current limiting. Clock generation accepts external crystal (0–20MHz) or clock input at XTAL1, with CLKDIV1/CLKDIV2 selecting fXTAL/1, /2, /4, or /8 while guaranteeing ≥45% duty cycle and synchronous transitions.

Key Specifications

Pinout & Package

DS8023-RJX+T&R is housed in a 28-pin Thin Shrink Small Outline Package (TSSOP) with 0.65mm pitch, thermally enhanced for industrial temperature operation (−40°C to +85°C). Pin 1 is located at the top-left corner (marking dot adjacent), and the package is RoHS-compliant and lead(Pb)-free.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TDA8024 and SLE66Rxx, DS8023-RJX+T&R delivers unique value in ultra-low-power stop mode (<10nA), native 1.8V support, and hardware-sequenced activation - making it optimal for cost-sensitive, battery-aware, and multi-voltage smart card readers where host MCU retains full protocol control.

Availability

DS8023-RJX+T&R is available at Aetrix Electronics and suitable for banking POS terminals, automated teller machines, and conditional access set-top boxes requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.

Supply support for DS8023-RJX+T&R 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

Maxim Integrated (now part of Analog Devices) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, communications, and security applications.

The DS8023-RJX+T&R belongs to Maxim's smart card interface product line, designed specifically to simplify ISO 7816/EMV/GSM11-11 reader development with integrated power, protection, and timing - targeting secure transaction infrastructure.

FAQ

What is the primary function of the DS8023-RJX+T&R in a smart card system?

The DS8023-RJX+T&R serves as the analog front-end interface between a host microcontroller and ISO 7816-compliant smart cards. It provides regulated 5V/3V/1.8V card power, level-shifting for I/O, CLK, and RST signals, ESD protection, and hardware-sequenced activation/deactivation - eliminating the need for discrete power, protection, and timing components in the reader design.

How does the DS8023-RJX+T&R achieve ultra-low stop-mode current?

The DS8023-RJX+T&R enters stop mode when CMDVCC, 5V/3V, and 1_8V pins are all driven high while the card interface is inactive. In this state, all internal analog circuits-including the charge pump, oscillator, and voltage generators-are disabled, resulting in a typical current draw of less than 10nA, as confirmed in the datasheet's "Stop-Mode Current" specification.

Can the DS8023-RJX+T&R replace the NXP TDA8024 without hardware changes?

Yes - the DS8023-RJX+T&R is explicitly documented as usable "as a replacement for the TDA8024 with little or no application changes." Pin compatibility, identical 28-pin TSSOP/SO footprint, and matching functional blocks (e.g., CLK, RST, I/O, PRES) enable direct substitution; software updates may be needed only to enable 1.8V mode or stop mode.

What clock sources does the DS8023-RJX+T&R support, and how is frequency selected?

The DS8023-RJX+T&R supports either a 0–20MHz crystal across XTAL1/XTAL2 or an external clock signal applied to XTAL1. Frequency division (fXTAL/1, /2, /4, /8) is selected via the binary combination of CLKDIV1 and CLKDIV2 pins, as defined in Table 1 of the datasheet - enabling precise clock alignment with EMV and ISO 7816 timing requirements.

Does the DS8023-RJX+T&R provide built-in ESD protection, and what level is specified?

Yes - the DS8023-RJX+T&R integrates ±8kV minimum ESD protection per IEC 61000-4-2 on all card-facing interface pins (I/O, CLK, RST, AUX1, AUX2, VCC, CGND). This eliminates the need for external TVS diodes on the card connector side, reducing component count and board space while ensuring robustness against user-handling events.