FT121 - Full speed USB device controller

FT121 provides an SPI slave interface to the host processor.

* End of Life 22nd January 2018 - no recommended replacements

* End of Life 22nd January 2018 - no recommended replacements

The FTDI FT121 provides a cost and feature optimized USB full-speed device controller. The device provides an SPI slave interface to the host processor and has internal clocking allowing for space optimised designs. Offering USB connectivity with bulk, isochronous or interrupt endpoints, the device also includes USB battery charger detection for recharging battery operated devices over USB.

Key features:

  • USB 2.0 Full Speed compatible
  • SPI slave interface to host processor
  • Support for multiple interrupt modes to facilitate bulk and isochronous transfers
  • Fully autonomous DMA engines for fast data transfer
  • Integrated 2 kbytes of configurable endpoint buffer
  • Double buffer scheme for main endpoint improves data transfer rates.
  • Good USB connection indicator that blinks with USB transmit and receive activities.
  • Single power supply operation at 3.3V or 5V.
  • Internal 1.8V and 3.3V LDO regulators
  • Extended operating temperature range : -40°C to 85°C.
  • Available in Pb-free TSSOP-16 and QFN-16 packages (RoHS compliant).

For sales and technical development support from our in-house engineering team, please contact the Alpha Micro team.

  • USB 2.0 Full Speed compatible
  • High performance USB device controller with integrated SIE, endpoint buffer, transceiver and voltage regulators
  • Fully integrated clock generation with no external crystal required
  • Supports Serial Parallel interface (SPI) slave to external microcontroller
  • Supports up to 8 bi-directional endpoints with total 2K bytes endpoint buffer
  • Max packet size is 504 bytes for isochronous endpoint and 64 bytes for control/bulk/interrupt endpoint
  • Double buffer scheme for any endpoint increases data transfer throughput
  • Multiple interrupt modes to facilitate both bulk and isochronous transfers
  • USB Battery Charger detection allowing optimized charging profile
  • Integrated DP pull-up resistor for USB connection
  • Supports bus powered or self powered application
  • VCC power supply operation at 3.3V or 5V
  • Internal 1.8V and 3.3V LDO regulators
  • VCC IO level range from 1.8V to 3.3V
  • Integrated power-on-reset circuit
  • UHCI/OHCI/EHCI host controller compatible
  • -40°C to 85°C extended operating temperature range
  • Available in Pb-free TSSOP-16 and QFN-16 packages (RoHS compliant)

* End of Life 22nd January 2018 - no recommended replacements

Part Number Description Pack Size
FT121T-R 16-pin TSSOP single chip full speed USB device controller IC Reel of 2,500
FT121T-U
16-pin TSSOP single chip full speed USB device controller IC
Tube of 96
FT121Q-R
16-pin QFN single chip full speed USB device controller IC
Reel of 6,000

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Last updated: 21 May 2018