The MAX3421E USB peripheral/host controller contains the digital logic and analog circuitry necessary to implement a full-speed USB peripheral or a full-/low-speed host compliant to USB specification rev 2.0. A built-in transceiver features ±15kV ESD protection and programmable USB connect and disconnect. An internal serial interface engine (SIE) handles low-level USB
protocol details such as error checking and bus retries. The MAX3421E operates using a register set accessed by an SPI™ interface that operates up to 26MHz. Any SPI master (microprocessor, ASIC, DSP, etc.) can add USB peripheral or host functionality using the simple 3- or 4-wire SPI interface.
The MAX3421E makes the vast collection of USB peripherals available to any microprocessor, ASIC, or DSP when it operates as a USB host. For point-to-point
solutions, for example, a USB keyboard or mouse interfaced to an embedded system, the firmware that operates the MAX3421E can be simple since only a
targeted device is supported.
Internal level translators allow the SPI interface to run at a system voltage between 1.4V and 3.6V. USB-timed operations are done inside the MAX3421E with interrupts provided at completion so an SPI master does not need timers to meet USB timing requirements. The MAX3421E includes eight general-purpose inputs and
outputs so any microprocessor that uses I/O pins to implement the SPI interface can reclaim the I/O pins and gain additional ones.
The MAX3421E operates over the extended -40°C to +85°C temperature range and is available in a 32-pin TQFP package (5mm x 5mm) and a 32-pin TQFN package
(5mm x 5mm).
Key Features
Applications/Uses
Microprocessor-Independent USB Solution
Software Compatible with the MAX3420E USB Peripheral Controller with SPI Interface
Complies with USB Specification Revision 2.0 (Full-Speed 12Mbps Peripheral, Full-/Low-Speed 12Mbps/1.5Mbps Host)
Integrated USB Transceiver
Firmware/Hardware Control of an Internal D+ Pullup Resistor (Peripheral Mode) and D+/D- Pulldown Resistors (Host Mode)
Programmable 3- or 4-Wire, 26MHz SPI Interface
Level Translators and VL Input Allow Independent System Interface Voltage
Internal Comparator Detects VBUS for Self-Powered Peripheral Applications
ESD Protection on D+, D-, and VBCOMP
Interrupt Output Pin (Level- or Programmable-Edge) Allows Polled or Interrupt-Driven SPI Interface
Eight General-Purpose Inputs and Eight General-Purpose Outputs
Interrupt Signal for General-Purpose Input Pins, Programmable Edge Polarity
Intelligent USB SIE
Automatically Handles USB Flow Control and Double Buffering
Handles Low-Level USB Signaling Details
Contains Timers for USB Time-Sensitive Operations so SPI Master Does Not Need to Time Events
Space-Saving Lead-Free TQFP and TQFN Packages (5mm x 5mm)
Notes: **This pricing is BUDGETARY, for comparing similar parts. Prices are in
U.S. dollars and subject to change. Quantity pricing may vary
substantially and international prices may differ due to local
duties, taxes, fees, and exchange rates. For volume-specific prices
and delivery, please see the price and availability page
or contact an authorized distributor.
* Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.
Devices:
1-4
of
4
MAX3421E
Free Sample
Buy
Package:
TYPE PINS FOOTPRINT
DRAWING CODE/VAR *
Temp
RoHS/Lead-Free? Materials Analysis
MAX3421EETJ+
THIN QFN;32 pin;
Dwg: 21-0140L (PDF)
Use pkgcode/variation: T3255+4*
