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Home > Products > Integrated Circuits (ICs) > Interface > Specialized

Analog Devices Inc./Maxim Integrated DS8313-RJX+

Name: DS8313-RJX+
Brand: Analog Devices Inc./Maxim Integrated
SKU: DS8313-RJX+
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: DS8313-RJX+

Manufacturer:: Analog Devices Inc./Maxim Integrated

Category:: Specialized

Package:: 28-TSSOP (0.173", 4.40mm Width)

Datasheet:: DS8313-RJX+.pdf

Description:: IC INTERFACE SPECIALIZED 28TSSOP

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Product details

Overview

The DS8313-RJX+ from Maxim Integrated is a smart card analog front-end IC designed to interface microcontrollers with ISO 7816-compliant 1.8V, 3V, and 5V smart cards-excluding AUX1/C4 and AUX2/C8 contacts. It delivers regulated VCC outputs (5V/80mA, 3V/65mA, 1.8V/30mA), supports flexible clock division (×1/2/4/8), and achieves ultra-low stop-mode current (<10nA). It is used in banking POS terminals and SIM card readers where low-power operation and multi-voltage support are critical.

For engineers reviewing the DS8313-RJX+ datasheet, DS8313-RJX+ pinout, DS8313-RJX+ application, or DS8313-RJX+ equivalent, key selection criteria include its dual-supply architecture (VDD + VDDA), absence of charge pump, presence-detect debounce timing (8ms typ), and compatibility with EMV 2000, GSM11-11, and ISO 7816 standards for secure transaction interfaces.

Technical Context

The DS8313-RJX+ implements an internal sequencer that autonomously manages smart card activation/deactivation-including controlled VCC ramp-up (t2 ≈ 1.5 × T, T ≈ 25µs), precise CLK enable timing (t4), and RST assertion (t5). Its voltage supervisor monitors VDD with hysteresis (VHYS2 = 50–150mV) and enforces a 220µs power-on reset pulse (tW).

It features dual-supply operation: VDD (2.7–6.0V) powers digital logic and host I/O transceivers, while VDDA (≥4.75V) supplies the analog card voltage generator. Clock generation accepts up to 20MHz crystal or external clock at XTAL1/XTAL2, with synchronous divider control via CLKDIV1/CLKDIV2 to produce CLK frequencies of fXTAL/8 to fXTAL.

Key Specifications

Parameter	Value and Actual Design Meaning
VDD Supply Range	2.7V to 6.0V - matches host MCU supply; enables direct level-shifting of I/OIN and control pins without external translators.
VDDA Supply Requirement	≥4.75V - required to generate accurate 5V card supply; insufficient VDDA causes VCC regulation failure per spec table.
VCC Output Capability	5V/80mA, 3V/65mA, 1.8V/30mA - sufficient for full-speed ISO 7816 Class A/B/C cards; overload detection triggers at ~120mA.
Stop-Mode Current	<10nA - achieved by disabling all analog circuits when CMDVCC, 5V/3V, and 1_8V are high; enables battery-powered PDA/laptop use.
ESD Protection	±8kV HBM on card I/O, CLK, RST, VCC - meets IEC 61000-4-2 Level 4 for robust field deployment in payment terminals.
CLK Timing Accuracy	Duty factor 45–55% - guaranteed across all divider settings and card voltages; satisfies ISO 7816-3 tCL and tCH requirements.
PRES Debounce Time	8ms typical - prevents false card-insertion detection due to mechanical switch bounce; configurable via trim option.

Pinout & Package

DS8313-RJX+ is housed in a 28-pin SOIC package (SO) with 0.3-inch body width and standard JEDEC MS-012AC footprint. Pin 18 is no-connect for DS8313 variants; all NC pins (1,2,5,7,8,9,12,13,27,28) must remain unconnected per datasheet.

Pin/Terminal	Circuit Role	Design Meaning
1,2	CLKDIV1, CLKDIV2	Binary-select inputs for CLK output frequency division (1,2,4,8×); asynchronous changes require ≥10ns delay between transitions.
3	5V/3V	Selects 5V or 3V card supply; overridden by 1_8V pin; logic-high = 5V, logic-low = 3V per Table 3.
4	1_8V	Active-high override for 1.8V card supply; takes precedence over 5V/3V; simultaneous high on 1_8V + 5V/3V + CMDVCC enters stop mode.
6,18	VDDA	Analog supply input; pin 18 is NC on DS8313-RJX+; must be ≥4.75V for stable 5V VCC generation.
10	PRES	Active-high card presence signal from reader switch; internally debounced (8ms typ); drives OFF interrupt after delay.
11	I/O	Smart card data line (contact C7); bidirectional transceiver with 11kΩ pullup to VCC; 15mA current limiting.
14	CGND	Dedicated smart card ground reference; decoupling capacitors for VCC must connect here-not to system GND.
15	CLK	Card clock output (contact C3); 0–10MHz, 45–55% duty cycle; slew rate 0.2V/ns (typ) for 1.8V cards.
16	RST	Card reset output (contact C2); driven low during activation/deactivation; supports 200μA load per spec.
17	VCC	Regulated smart card supply output; requires 100nF + 220nF ceramic decoupling to CGND (ESR < 100mΩ).
19	CMDVCC	Active-low command to initiate activation sequence; high state enables stop mode when 1_8V and 5V/3V are also high.
20	RSTIN	Host-provided reset input; controls RST output timing post-activation; must be low before t5 to avoid ATR corruption.
21	VDD	Digital supply input; powers internal logic, sequencer, and I/O transceivers; same voltage as host MCU.
22	GND	Digital ground reference; separate from CGND to prevent noise coupling into card interface.
23	OFF	Active-low fault/status interrupt; includes 24kΩ internal pullup to VDD; asserts low on short-circuit, overtemp, or card removal.
24,25	XTAL1, XTAL2	Crystal/clock input pair; supports up to 20MHz fundamental-mode crystal; XTAL1 accepts external clock if XTAL2 is grounded.
26	I/OIN	Host-to-DS8313 data line; pulled high to VDD via 11kΩ; master/slave arbitration with I/O ensures glitch-free level shifting.

Key Features

Feature	Design Value
Triple-Voltage Smart Card Supply Generation	Internally generates 5V/80mA, 3V/65mA, or 1.8V/30mA from single VDDA input-eliminates need for external LDOs in multi-standard readers.
Autonomous Activation/Deactivation Sequencer	Hardware-controlled timing (tACT = 50–220μs, tDEACT = 50–100μs) ensures ISO 7816-compliant power-up/down without host software overhead.
Integrated I/O Transceiver with Master-Slave Arbitration	Eliminates external bus switches; detects first falling edge to assign master role, enabling reliable half-duplex communication on shared I/O lines.
Ultra-Low-Power Stop Mode	<10nA quiescent current achieved by disabling all analog blocks-critical for portable devices requiring months of standby battery life.
Comprehensive Fault Monitoring	Detects VCC short-circuit, card removal during transaction, VDD dropout, overheating (TSD = +150°C), and VDDA undervoltage-triggers automatic deactivation.

Applications

Banking POS Terminals	Mobile SIM Card Readers
Use Scenario: Secure debit/credit card transactions at retail point-of-sale systems using EMV-compliant contact smart cards. IC Role / Device Role / Timing Role: Provides regulated 5V/3V/1.8V power, ISO 7816-compliant CLK/RST/I/O signaling, and fault-safe deactivation during card removal. Use Value: Enables single-chip support for legacy and modern smart cards without redesigning power or interface circuitry.	Use Scenario: Embedded SIM (eSIM) provisioning and authentication in portable diagnostic or IoT gateways. IC Role / Device Role / Timing Role: Interfaces host MCU to SIM card via C1–C8 contacts (excluding C4/C8), managing voltage selection and presence detection. Use Value: Reduces BOM count by integrating level shifters, regulators, and sequencer-cutting PCB area vs. discrete solutions.
ATM Card Readers	Secure Access Control Panels
Use Scenario: High-reliability card reading in automated teller machines operating 24/7 under varying ambient temperatures. IC Role / Device Role / Timing Role: Delivers robust 5V/80mA VCC with ±8kV HBM ESD protection and thermal shutdown at +150°C junction temperature. Use Value: Ensures uninterrupted operation during repeated card insertions and environmental stress without firmware intervention.	Use Scenario: Physical access control using contact-based smart cards in enterprise door entry systems. IC Role / Device Role / Timing Role: Manages card presence (PRES debounce), secure power sequencing, and tamper-resistant clock/data paths. Use Value: Prevents unauthorized access attempts via glitch injection by enforcing strict ISO 7816 timing windows (tCL/tCH).

Banking POS Terminals

Mobile SIM Card Readers

Use Scenario: Secure debit/credit card transactions at retail point-of-sale systems using EMV-compliant contact smart cards.

IC Role / Device Role / Timing Role: Provides regulated 5V/3V/1.8V power, ISO 7816-compliant CLK/RST/I/O signaling, and fault-safe deactivation during card removal.

Use Value: Enables single-chip support for legacy and modern smart cards without redesigning power or interface circuitry.

Use Scenario: Embedded SIM (eSIM) provisioning and authentication in portable diagnostic or IoT gateways.

IC Role / Device Role / Timing Role: Interfaces host MCU to SIM card via C1–C8 contacts (excluding C4/C8), managing voltage selection and presence detection.

Use Value: Reduces BOM count by integrating level shifters, regulators, and sequencer-cutting PCB area vs. discrete solutions.

ATM Card Readers

Secure Access Control Panels

Use Scenario: High-reliability card reading in automated teller machines operating 24/7 under varying ambient temperatures.

IC Role / Device Role / Timing Role: Delivers robust 5V/80mA VCC with ±8kV HBM ESD protection and thermal shutdown at +150°C junction temperature.

Use Value: Ensures uninterrupted operation during repeated card insertions and environmental stress without firmware intervention.

Use Scenario: Physical access control using contact-based smart cards in enterprise door entry systems.

IC Role / Device Role / Timing Role: Manages card presence (PRES debounce), secure power sequencing, and tamper-resistant clock/data paths.

Use Value: Prevents unauthorized access attempts via glitch injection by enforcing strict ISO 7816 timing windows (tCL/tCH).

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
DS8314-RJX+	Single VDDA supply only; reduced 5V card drive capability (no 80mA guarantee); pin-compatible but lower VCC current headroom.	Suitable for cost-sensitive designs where 5V card loading is ≤65mA; cannot replace DS8313-RJX+ in full-spec EMV terminals.	Select DS8314-RJX+ only if VDDA sourcing is constrained and 5V card current demand is confirmed ≤65mA.
TDA8024B	Legacy NXP device; requires external charge pump; higher active current (>1mA); no 1.8V support; different pinout and control logic.	Used in older banking hardware; lacks ultra-low stop mode and triple-voltage flexibility; not drop-in compatible.	Choose TDA8024B only for legacy board refreshes with unchanged layout; new designs should prioritize DS8313-RJX+'s integration and power savings.

Compared with DS8314-RJX+, DS8313-RJX+ provides full 80mA 5V card drive and dual-VDDA architecture for higher reliability; versus TDA8024B, it eliminates external components, adds 1.8V support, and reduces standby power by >5 orders of magnitude.

Availability

DS8313-RJX+ is available at Aetrix Electronics and suitable for banking POS terminals, ATM card readers, mobile SIM interfaces, and secure access control systems requiring stable component supply across industrial temperature ranges (–40°C to +85°C).

Supply support for DS8313-RJX+ 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 DS8313-RJX+ belongs to Maxim's smart card interface product line, engineered specifically for ISO 7816-compliant contact card readers requiring multi-voltage support, low-power operation, and autonomous power sequencing.

FAQ

What is the maximum crystal frequency supported by DS8313-RJX+?

The DS8313-RJX+ supports external crystals up to 20MHz connected across XTAL1 and XTAL2. This allows CLK output frequencies of up to 10MHz (fXTAL/2) or 20MHz (fXTAL) depending on CLKDIV1/CLKDIV2 settings, fully meeting ISO 7816-3 timing requirements for Class A, B, and C cards. The internal oscillator operates at 2.2–3.4MHz for auxiliary functions.

How does DS8313-RJX+ handle smart card voltage selection between 1.8V, 3V, and 5V?

The DS8313-RJX+ uses priority-based digital control: the 1_8V pin (active-high) overrides the 5V/3V pin. When 1_8V = high, VCC = 1.8V regardless of 5V/3V state. When 1_8V = low, 5V/3V = high selects 5V and 5V/3V = low selects 3V. Simultaneous high on 1_8V, 5V/3V, and CMDVCC forces stop mode-so sequencing must observe ≥100ns delay between control pin changes.

What is the purpose of the OFF pin on DS8313-RJX+ and how is it used?

The OFF pin on DS8313-RJX+ is an active-low interrupt output signaling card presence or fault conditions. When CMDVCC is high, OFF = high indicates card insertion (after 8ms debounce); when CMDVCC is low during a session, OFF = low signals faults like VCC short-circuit, card removal, or overtemperature. Host firmware uses OFF to trigger emergency deactivation or status polling without polling PRES or monitoring analog signals directly.

Can DS8313-RJX+ be used with 1.8V smart cards while powered from a 3.3V host system?

Yes. DS8313-RJX+ supports 1.8V smart cards when VDD = 3.3V (within 2.7–6.0V range) and VDDA ≥ 4.75V. Setting 1_8V = high configures the internal regulator to deliver 1.8V ±10% at up to 30mA to VCC. All I/O transceivers automatically level-shift between the 3.3V host domain and 1.8V card domain, satisfying ISO 7816-3 voltage thresholds for both sides.

What protection features does DS8313-RJX+ include for rugged deployment?

DS8313-RJX+ integrates ±8kV HBM ESD protection on all card-facing pins (I/O, CLK, RST, VCC), short-circuit and overcurrent detection on VCC (trips at ~120mA), thermal shutdown at +150°C, and VDD undervoltage lockout with hysteresis. These features ensure reliable operation in harsh environments like public payment kiosks or outdoor access panels without requiring external protection components.

DS8313-RJX+ Specifications

Product attributes: Attribute value

Manufacturer:: Analog Devices Inc./Maxim Integrated

Series:: -

Package/Case:: 28-TSSOP (0.173", 4.40mm Width)

Packaging:: Tube

Product Status:: Obsolete

Applications:: Smart Card

Interface:: Analog

Voltage - Supply:: 2.7V ~ 6V

Supplier Device Package:: 28-TSSOP

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

DS8313-RJX+ FAQ

1.How can I place an order for DS8313-RJX+ through Aetrix?

Please submit a Request for Quotation (RFQ) for DS8313-RJX+ on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for DS8313-RJX+ reliable?

The price and inventory of DS8313-RJX+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DS8313-RJX+ is usually 5 days.

3.What payment methods are accepted for DS8313-RJX+?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS8313-RJX+ transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for DS8313-RJX+?

DS8313-RJX+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your DS8313-RJX+ order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for DS8313-RJX+?

For technical support, including DS8313-RJX+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS8313-RJX+ requirements.

6.How does Aetrix verify that DS8313-RJX+ is sourced from the original manufacturer or authorized distributors?

All DS8313-RJX+ products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that DS8313-RJX+ meets industry standards.

7.What is the process for return or replacement of DS8313-RJX+?

All DS8313-RJX+ units undergo pre-shipment inspection (PSI). If there is an issue with DS8313-RJX+, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The DS8313-RJX+ part is unused and in its original packaging.

Return procedure for DS8313-RJX+:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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