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Analog Devices Inc./Maxim Integrated MAX3421EETJ+
- Part No.:
- MAX3421EETJ+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Controllers
- Package:
- 32-WFQFN Exposed Pad
- Datasheet:
-
MAX3421EETJ+.pdf
- Description:
- IC USB PERIPH/HOST CNTRL 32TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:253
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Product details
Overview
MAX3421EETJ+ from Maxim Integrated is a full-speed USB 2.0 peripheral/host controller IC with integrated transceiver and SPI interface, operating at up to 26MHz. It supports both peripheral (12Mbps) and host (12Mbps/1.5Mbps) modes, features ±15kV ESD protection on D+/D-/VBCOMP, and includes dual 64-byte FIFOs, eight GP inputs/outputs, and internal level translators for 1.4V–3.6V VL interface voltage. It enables USB connectivity in embedded microprocessor systems such as medical devices and industrial PLCs.
For engineers reviewing the MAX3421EETJ+ datasheet, MAX3421EETJ+ pinout, MAX3421EETJ+ application, or MAX3421EETJ+ equivalent, key selection criteria include its dual-mode USB operation, 32-pin TQFN-EP package with exposed pad, register-level compatibility with MAX3420E in peripheral mode, and support for isolated USB interfaces via programmable interrupt signaling and VBUS detection.
Technical Context
The MAX3421EETJ+ integrates a full-featured Serial Interface Engine (SIE) that autonomously handles USB protocol layers-including DATA0/DATA1 toggle management, SOF/EOP generation, error checking, and flow control-relieving the SPI master of timing-critical tasks. Its internal oscillator with 4× PLL generates the required 48MHz clock from a 12MHz crystal, enabling precise USB frame synchronization without external timers.
It implements dual-role USB functionality through configurable register sets: in peripheral mode, it mirrors the MAX3420E register map with added GPIO and interrupt enhancements; in host mode, it extends the map with 11 dedicated registers (R21–R31) for hub support, isochronous transfers, and endpoint control. The SIE manages double-buffered FIFOs (64-byte SNDFIFO/RCVFIFO) and automatic buffer synchronization across multi-packet transfers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| USB Compliance | USB 2.0 full-speed (12Mbps) peripheral and full-/low-speed (12/1.5Mbps) host - enables direct integration into standard USB 2.0 systems without protocol translation. |
| SPI Interface Speed | Up to 26MHz - supports high-throughput data transfer between host MCU and USB engine, reducing firmware latency in time-sensitive applications. |
| Operating Temperature | -40°C to +85°C - qualified for industrial and medical embedded environments requiring extended thermal reliability. |
| FIFO Architecture | Dual 64-byte double-buffered SNDFIFO and RCVFIFO - allows concurrent SPI data loading and USB packet transmission, improving real-time throughput. |
| ESD Protection | ±15kV HBM on D+, D-, VBCOMP - eliminates need for external TVS diodes in most board-level ESD designs, simplifying layout and BOM. |
| Logic Interface Voltage | VL = 1.4V to 3.6V - enables interoperability with low-voltage MCUs (e.g., 1.8V or 2.5V cores) while VCC remains at 3.3V for USB transceiver integrity. |
| Package | 32-pin TQFN-EP (5mm × 5mm) with exposed pad - provides thermal efficiency and compact footprint suitable for space-constrained embedded modules. |
Pinout & Package
MAX3421EETJ+ is housed in a 32-pin TQFN package (5mm × 5mm) with exposed thermal pad (EP) connected to GND. The package supports fine-pitch PCB assembly and enhanced thermal dissipation for sustained USB host operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 26–32 | GPIN0–GPIN7 | General-purpose inputs with internal VL-referenced pullups - provide flexible system monitoring (e.g., button states, sensor flags) without external biasing. |
| 4–11, 20 | GPOUT0–GPOUT7 | VL-referenced push-pull outputs - reclaim MCU I/O pins used for SPI and add auxiliary control signals (e.g., LED drivers, enable lines). |
| 13, 14, 15, 16 | SCLK, SS, MISO, MOSI | Standard 4-wire SPI interface - supports full-duplex or half-duplex (MOSI bidirectional) configuration to reduce MCU pin count. |
| 17 | GPX | Programmable multiplexed output - selectable among five internal signals (e.g., BUSACT, GPIN interrupts), enabling flexible interrupt routing without additional logic. |
| 18 | INT | Configurable edge- or level-triggered interrupt - signals USB events (e.g., packet completion, VBUS detect) to offload polling and improve system responsiveness. |
| 20, 21 | D-, D+ | Differential USB data lines with internal 1.5kΩ D+ pullup (peripheral) and 15kΩ D+/D− pulldowns (host) - eliminate external resistors for basic USB enumeration. |
| 22 | VBCOMP | VBUS comparator input - enables self-powered peripheral detection by monitoring 5V presence on USB upstream port, critical for battery-operated devices. |
| 23 | VCC | 3.3V supply for USB transceiver and core logic - requires local 1.0µF ceramic decoupling for stable high-speed signaling. |
| 24, 25 | XI, XO | 12MHz crystal oscillator terminals - support parallel-resonant crystal with ±0.25% tolerance; XO floats when XI driven externally. |
| 2, 3, 19 | VL, GND | Level-translator reference and ground - VL sets logic interface voltage; GND pins provide low-inductance return paths for analog/digital domains. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated USB Transceiver | Eliminates external PHY components and reduces BOM cost; built-in ±15kV ESD protection avoids discrete TVS diodes. |
| Intelligent Serial Interface Engine (SIE) | Handles all low-level USB protocol details - including SOF/EOP generation, DATA toggle, error recovery, and bus retries - freeing MCU firmware from timing-critical USB state machines. |
| Programmable D+/D− Pullup/Pulldown Resistors | Enables seamless mode switching: D+ pullup active in peripheral mode for enumeration; D+/D− pulldowns active in host mode per USB spec requirements. |
| Eight GP Inputs + Eight GP Outputs | Replaces MCU I/O pins consumed by SPI interface and adds system-level control capability - e.g., driving status LEDs or reading hardware switches without GPIO expansion. |
| VBUS Detection via VBCOMP | Allows self-powered peripherals to detect upstream power presence and enter suspend/resume states autonomously, meeting USB power management requirements. |
| Crystal Oscillator with 4× PLL | Derives precise 48MHz USB clock from low-cost 12MHz crystal - removes need for external clock generator and ensures compliance with USB timing jitter specifications. |
Applications
| Medical Infusion Pumps | Industrial PLC USB Host Port |
|---|---|
Use Scenario: An embedded infusion pump uses USB to connect to a clinical PC for firmware updates and log retrieval. IC Role / Device Role / Timing Role: MAX3421EETJ+ acts as a USB host controller, enumerating the PC as a CDC device and managing bulk transfers under strict real-time deadlines. Use Value: Its double-buffered 64-byte FIFOs and autonomous SIE ensure uninterrupted data streaming during motor actuation, preventing transfer stalls that could disrupt therapy delivery. |
Use Scenario: A programmable logic controller adds USB host capability to interface with USB-to-serial adapters for legacy RS-232 field devices. IC Role / Device Role / Timing Role: MAX3421EETJ+ serves as the USB host controller, handling low-speed (1.5Mbps) communication and automatic SOF/EOP framing for adapter enumeration. Use Value: Built-in 15kΩ D+/D− pulldowns and register-level hub support allow plug-and-play connection of multiple adapters without external resistor networks or hub ICs. |
| Portable Diagnostic Handheld | USB-Isolated Test Equipment |
Use Scenario: A battery-powered handheld ultrasound device connects to a PC via USB for image export and calibration data sync. IC Role / Device Role / Timing Role: MAX3421EETJ+ operates in peripheral mode, presenting itself as a custom USB device with vendor-specific descriptors and bulk endpoints. Use Value: VL interface voltage scaling down to 1.4V reduces active current draw from the MCU's 1.8V rail, extending battery life during prolonged imaging sessions. |
Use Scenario: High-voltage test equipment isolates its USB interface using optocouplers to protect the host PC from transient surges. IC Role / Device Role / Timing Role: MAX3421EETJ+ functions as a peripheral controller with NAK-based flow control, allowing optoisolator latency without violating USB timing constraints. Use Value: Its SIE-managed NAK handshaking permits arbitrary SPI interface delay - enabling use of low-cost, slow optocouplers while maintaining full USB 2.0 compliance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar USB peripheral/host controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX3420EETJ+ | Peripheral-only USB controller; lacks host-mode registers (R21–R31), no SOF/EOP generation, no hub or isochronous support. | Restricted to embedded USB peripheral roles (e.g., HID devices); cannot serve as USB host for peripherals like keyboards or flash drives. | Select MAX3420EETJ+ only when host functionality is unnecessary and cost reduction is prioritized over feature flexibility. |
| USB3300-EZK | USB 2.0 transceiver only (no SIE or SPI interface); requires external MCU with USB stack; no integrated FIFOs or register set. | Demands full USB protocol implementation in firmware; unsuitable for resource-constrained MCUs lacking USB stack memory or processing headroom. | Choose USB3300-EZK only when existing MCU has mature USB host/peripheral stack and design requires maximum PHY-level control over signaling. |
Compared with MAX3420EETJ+, the MAX3421EETJ+ adds full host capability and dual-mode flexibility; compared with USB3300-EZK, it delivers complete offload of USB protocol handling and eliminates firmware stack dependencies - making it optimal for MCUs with limited RAM/Flash or no native USB support.
Availability
MAX3421EETJ+ is available at Aetrix Electronics and suitable for medical diagnostics, industrial automation, and portable instrumentation requiring stable component supply, RoHS-compliant packaging, and long-term industrial temperature operation.
Supply support for MAX3421EETJ+ 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 and mixed-signal ICs for industrial, medical, and communications applications.
The MAX3421E product line was designed to bring USB 2.0 host and peripheral functionality to resource-constrained microcontrollers via simple SPI, eliminating the need for complex USB stacks or dedicated USB-capable MCUs.
FAQ
What USB speeds does the MAX3421EETJ+ support in host and peripheral modes?
The MAX3421EETJ+ supports full-speed USB 2.0 (12Mbps) in peripheral mode and both full-speed (12Mbps) and low-speed (1.5Mbps) in host mode. Its internal SIE automatically selects the appropriate speed based on device descriptor negotiation and handles all timing-critical aspects including SOF (full-speed) or EOP (low-speed) frame markers at 1ms intervals - ensuring compliance without MCU intervention.
How does the MAX3421EETJ+ handle USB enumeration in peripheral mode?
In peripheral mode, the MAX3421EETJ+ uses its internal 1.5kΩ D+ pullup resistor (programmable via USBCTL register) to signal attachment to the host. Its SIE automatically responds to SET_ADDRESS, GET_DESCRIPTOR, and other standard control requests using the EP0 64-byte control FIFO and SETUP 8-byte FIFO - enabling full enumeration without MCU firmware parsing USB descriptors.
Can the MAX3421EETJ+ operate with a 1.8V microcontroller interface?
Yes. The MAX3421EETJ+ supports VL interface voltages from 1.4V to 3.6V. When VL = 1.8V, its SPI pins (SCLK, MOSI, MISO, SS), GPIN/GPOUT, and INT operate at 1.8V logic levels, while VCC remains at 3.3V to power the USB transceiver - enabling direct interfacing with 1.8V-core MCUs without level shifters.
What is the role of the GPX pin on the MAX3421EETJ+?
The GPX pin on the MAX3421EETJ+ is a programmable multiplexed output controlled by PINCTL (R17) and MODE (R27) register bits. It can be configured to output one of five internal signals - including BUSACT, GPIN interrupt flags, or RSMREQIRQ - providing flexible interrupt routing and reducing the need for external logic or additional MCU pins in complex USB systems.
Does the MAX3421EETJ+ require an external crystal, and what are the tolerance requirements?
Yes, the MAX3421EETJ+ requires a 12MHz parallel-resonant crystal connected between XI and XO pins. The datasheet specifies ±0.25% frequency tolerance to ensure USB frame timing accuracy and meet USB 2.0 full-speed jitter requirements. External load capacitors must be selected per crystal manufacturer recommendations, typically 12–18pF.
MAX3421EETJ+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package/Case:
- 32-WFQFN Exposed Pad
- Programmable:
- Not Verified
- Protocol:
- USB
- Function:
- Controller
- Interface:
- SPI
- Standards:
- USB 2.0
- Voltage - Supply:
- 3V ~ 3.6V
- Current - Supply:
- 15mA
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 32-TQFN (5x5)
- Grade:
- -
- Qualification:
- -
MAX3421EETJ+ FAQ
1.How can I place an order for MAX3421EETJ+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX3421EETJ+ 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 MAX3421EETJ+ reliable?
The price and inventory of MAX3421EETJ+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX3421EETJ+ is usually 5 days.
3.What payment methods are accepted for MAX3421EETJ+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX3421EETJ+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX3421EETJ+?
MAX3421EETJ+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX3421EETJ+ 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 MAX3421EETJ+?
For technical support, including MAX3421EETJ+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX3421EETJ+ requirements.
6.How does Aetrix verify that MAX3421EETJ+ is sourced from the original manufacturer or authorized distributors?
All MAX3421EETJ+ 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 MAX3421EETJ+ meets industry standards.
7.What is the process for return or replacement of MAX3421EETJ+?
All MAX3421EETJ+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX3421EETJ+, 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 MAX3421EETJ+ part is unused and in its original packaging.
Return procedure for MAX3421EETJ+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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