Enhanced Quad E1 Framer

Please check latest availability status for a specific part variant.


The DS21Q44 E1 is an enhanced version of the DS21Q43 quad E1 framer. The DS21Q44 contains four framers that are configured and read through a common microprocessor-compatible parallel port. Each framer consists of a receive framer, receive elastic store, transmit formatter, and transmit elastic store. All four framers in the DS21Q44 are totally independent; they do not share a common framing synchronizer. The transmit and receive sides of each framer are also totally independent. The dual two-frame elastic stores contained in each of the four framers can be independently enabled and disabled as required. The device fully meets all of the latest E1 specifications including CCITT/ITU G.704, G.706, G.962, and I.431 as well as ETS 300 011 and ETS 300 233.
DS21Q44: Functional Diagram DS21Q44: Functional Diagram Enlarge+

Key Features

  • Four E1 (CEPT or PCM-30)/ISDN-PRI framing transceivers
  • All four framers are fully independent; transmit and receive sections of each framer are fully independent
  • Frames to FAS, CAS, CCS, and CRC4 formats
  • Each of the four framers contain dual twoframe elastic-store slip buffers that can connect to asynchronous backplanes up to 8.192MHz
  • 8-bit parallel control port that can be used directly on either multiplexed or nonmultiplexed buses (Intel or Motorola)
  • Easy access to Si and Sa bits
  • Extracts and inserts CAS signaling
  • Large counters for bipolar and code violations, CRC4 code word errors, FAS word errors, and E-bits
  • Programmable output clocks for Fractional E1, per channel loopback, H0 and H12 applications
  • Integral HDLC controller with 64-byte buffers configurable for Sa bits or DS0 operation
  • Detects and generates AIS, remote alarm, and remote multiframe alarms
  • Pin compatible with DS21Q42 enhanced quad T1 framer
  • 3.3V supply with 5V tolerant I/O; low-power CMOS
  • Available in 128-pin TQFP package
  • IEEE 1149.1 support
Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C  

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.

Quality Management System >
Environmental Management System >


Related Resources

Belle Isle 2020
05/29/2020 - 05/31/2020, Detroit, MI
2020 Detroit Grand Prix - Chevrolet Detroit Grand Prix presented by Lear Fast Facts The Chevrolet Detroit Grand Prix presented by Lear was hosted on Belle Isle, May 29 - 30 2020. The event featured the cars of the NTT IndyCar Series, the IMSA WeatherTech SportsCar Championship and the Trans Am Series presented by Pirelli. The weekend is collectively referred to as the Chevrolet Detroit Grand Prix presented by Lear and it once again featured the Chevrolet Dual in Detroit IndyCar doubleheader.