इसी प्रकार केYTD439

• YTD418
  • 5.0V; IDNPHS ISDN basic access
• YTD421B
  • 5.0V; IDR ISDN driver/receiver LSI for the ISDN BRI S/T interface
• YTD421B-E
  • ISDN driver/receiver
• YTD423
  • ISDN BRI controller with B-ch HDLC controller
• YTD423
  • 0.3-7.0V; IHDLC2 ISDN BRI controller with B-ch HDLC controller
• YTD426B
  • 5.0V; ITCM ISDN U interface (TCM mode)
• YTD427
  • 5.0V; IAFE ISDN DSU analog front end
• YTD428
  • 5V DSU LSI for the ISDN terminal eguipment