General Description

The MAX3420E contains the digital logic and analog

circuitry necessary to implement a full-speed USB

peripheral compliant to USB specification rev 2.0. A

built-in full-speed transceiver features ±15kV ESD pro-

tection and programmable USB connect and discon-

nect. An internal SIE (serial-interface engine) handles

low-level USB protocol details such as error checking

and bus retries. The MAX3420E operates using a regis-

ter set accessed by an SPI interface that operates up to

26MHz. Any SPI master (microprocessor, ASIC, DSP,

etc.) can add USB functionality using the simple 3- or

4-wire SPI interface.

Internal level translators allow the SPI interface to run at

a system voltage between 1.71V and 3.6V. USB timed

operations are done inside the MAX3420E with inter-

rupts provided at completion so an SPI master does not

need timers to meet USB timing requirements. The

MAX3420E includes four 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 MAX3420E operates over the extended -40°C to

+85°C temperature range and is available in a 32-pin

TQFP package (7mm x 7mm) and a space-saving 24-

pin TQFN package (4mm x 4mm).

Applications

Features

♦ Microprocessor-Independent USB Solution

♦ Complies with USB Specification Revision 2.0

(Full-Speed Operation)

♦ Integrated Full-Speed USB Transceiver

♦ Firmware/Hardware Control of an Internal D+

Pullup Resistor

♦ Programmable 3- or 4-Wire 26MHz SPI Interface

System Interface Voltage

Self-Powered Applications

♦ ESD Protection on D+, D-, and VBCOMP

♦ Interrupt Output Pin (Level or Programmable

Edge) Allows Polled or Interrupt-Driven SPI

Interface

♦ Intelligent USB Serial Interface Engine (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

♦ Built-In Endpoint FIFOs:

EP0: CONTROL (64 Bytes)

EP1: OUT, Bulk or Interrupt, 2 x 64 Bytes

(Double-Buffered)

EP2: IN, Bulk or Interrupt, 2 x 64 Bytes

(Double-Buffered)

EP3: IN, Bulk or Interrupt (64 Bytes)

♦ Double-Buffered Data Endpoints Increase

Throughput by Allowing the SPI Master to

Transfer Data Concurrently with USB Transfers

Over the Same Endpoint

♦ SETUP Data Has Its Own 8-Byte FIFO, Simplifying

Firmware

♦ Four General-Purpose Inputs and Four General-

Purpose Outputs

♦ Space-Saving TQFP and TQFN Packages

USB Peripheral Controller

with SPI Interface

________________________________________________________________ Maxim Integrated Products

1

19-3781; Rev 0; 8/05

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at

1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

Cell Phones

PC Peripherals

Microprocessors and

DSPs

Custom USB Devices

Cameras

Desktop Routers

PLCs

Set-Top Boxes

PDAs

MP3 Players

Instrumentation

PART

TEMP RANGE

PIN-

PACKAGE

PACKAGE

CODE

MAX3420EECJ -40°C to +85°C

32 TQFP

7mm x 7mm x

1.4mm

C32-1

MAX3420EETG* -40°C to +85°C

24 TQFN

4mm x 4mm x

0.8mm

T2444-4

Ordering Information

*Future product—contact factory for availability.