HFC Series


4 S/T interfaces


8 S/T interfaces


 1 E1 (S2M) interface

Technology features

  • single 3.3V power supply
  • CMOS technology 3.3V, 5V tolerant on nearly all inputs
  • MQFP 208 package, 0.5mm pin pitch
  • RoHS and REACH compliant
  • Temperature Range and Soldering Reflow
  • MSL 3
  • Packed on JEDEC tray

HFC Series targets PC-based applications and comes with an integrated local-bus interface, mostly used for the connection to the PCI bus. In PCIe environments, a PCI-to-PCIe bridge chip can be used to adapt HFC Series.

HFC-4S and HFC-8S are a HDLC B- and D-channel controller with 4 resp. 8 integrated S/T interfaces. They can be used for ISDN basic rate lines. All channels are served fully duplex by FIFOs. Also implemented is a PCM128 / PCM64 / PCM30 highway interface and an universal external bus interface.


  • ICs of HFC Series have integrated HDLC controllers for all kinds of BRI equipment
  • A PCM128 / PCM64 / PCM30 interface for CODEC or inter-chip connection is also integrated
  • single chip ISDN-S/T-controller with B- and D-channel HDLC support
  • full I.430 ITU S/T ISDN support in TE and NT mode
  • 32 independent read and write HDLC-channels
    for e.g. 8 ISDN B-channels, 4 ISDN D-channels and 20 timeslots on the PCM interface
  • B-channel transparent mode independently selectable
  • up to 64 FIFOs; FIFO-size configurable
  • each FIFO can be assigned to an arbitrary channel of any S/T or PCM interface
  • PCM128 / PCM64 / PCM30 interface configurable to interface for inter-chip connection (e.g. external CODECs)
  • universal external bus interface configurable into PCI bus, ISA-PnP, PCMCIA or integrated 8 bit parallel microprocessor interface as well as SPI

It's all about the port granularity: The difference between ICs of HFC Series is based solely on the three types of integrated interfaces:


Block diagram for HFC-4S

Block diagram of HFC-8S

Block diagram of HFC-E1

Benefits of HFC Series

  1. Low power consumption
  2. Easy inter-chip connection to telecom ICs
  3. Fully digital chip architecture
  4. Excellent price
  5. Comprehensive software support