Recommended for new projects

- In mass production
- Available from stock in volumes


  • Integrated PCI bus interface
  • Low power consumption
  • Easy inter-chip connection to telecom ICs
  • Fully digital chip architecture
  • Excellent lead times
  • Competitive price
  • Comprehensive software support


The HFC-4S is a HDLC B- and D-channel controller with 4 integrated S/T HDLC Basic Rate Interface controllers for all kinds of BRI equipment, such as High performance ISDN PC cards, ISDN PABX for BRI, VoIP gateways / VoIP routers and many other applications. All channels are served fully duplex by deep FIFOs.

Also implemented is a PCM128 / PCM64 / PCM30 highway interface and an integrated universal external bus interface that can be configured to PCI, ISA Plug and Play, PCMCIA, parallel microprocessor interface or SPI.


Technology Element Details
S/T interfaces 4
Bus interfaces PCI, PCMCIA, SPI, 8 bit parallel
CODEC or inter-chip connection PCM128 / PCM64 / PCM30, H.100
Technology features CMOS 3.3 V technology, 5 V tolerant on nearly all inputs
Package MQFP 208