±15kV ESD-Protected USB Transceivers in UCSP with USB Detect

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The MAX3344E/MAX3345E USB transceivers convert logic-level signals to USB signals, and USB signals to logic-level signals. An internal 1.5kΩ USB pullup resistor supports full-speed (12Mbps) USB operation. The MAX3344E/MAX3345E provide built-in ±15kV ESD-protection circuitry on the USB I/O pins, D+ and D-, and VCC.

The MAX3344E/MAX3345E operate with logic supply voltages as low as 1.65V, ensuring compatibility with low-voltage ASICs. The suspend mode lowers supply current to less than 40µA. An enumerate function allows devices to logically disconnect while plugged in. The MAX3344E/MAX3345E are fully compliant with USB specification 1.1, and full-speed operation under USB specification 2.0.

The MAX3344E/MAX3345E have a USB detect that monitors the USB bus for insertion and signals this event. The MAX3344E USB_DET threshold is between 3.6V (min) and 4V (max), while the MAX3345E USB_DET threshold is between 1V (min) and 2.8V (max).

The MAX3344E/MAX3345E are available in the miniature 4 x 4 UCSP™, as well as the small 16-pin TSSOP, and are specified over the extended temperature range, -40°C to +85°C.
MAX3344E, MAX3345E: Typical Operating Circuit MAX3344E, MAX3345E: Typical Operating Circuit Enlarge+

Key Features

  • ±15kV ESD Protection On D+ and D-
  • Comply with USB Specification 1.1 (Full Speed 2.0)
  • Separate VP and VM Inputs/Outputs
  • VL Down to 1.65V Allows Connection with Low-Voltage ASICs
  • Enumerate Input—Allows USB Connection through Software
  • USB Detect Function
    • 3.6V (min) to 4V (max)—MAX3344E
    • 1V (min) to 2.8V (max)—MAX3345E
  • Allow Single-Ended or Differential Logic I/O
  • Internal Linear Regulator Allows Direct Powering from the USB
  • Internal Pullup Resistor for Full-Speed Operation
  • Three-State Outputs
  • No Power-Supply Sequencing Required
  • Driver Active in Suspend Mode
  • Available in Miniature Chip-Scale Package


  • Cell Phones
  • Data Cradles
  • Digital Cameras
  • Information Appliances
  • MP3 Players
  • PC Peripherals
  • PDAs

See parametric specs for USB Transceivers (8)

Part NumberVL
Supports USB SpeedInternal USB Pullup ResistorESD Protect.
(1.5kΩ)(See Notes)
MAX3344E 1.65 to 3.6Full-SpeedYes154.0 to 5.5
UCSP (B)/16
$1.65 @1k
UCSP (B)/16
$1.64 @1k

Pricing 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 and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

MAX3345EEVKIT: Evaluation Kit for the MAX3344E, MAX3345E
Request Reliability Report for: MAX3345E 
Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C   Material Composition  

Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

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