4x3 Twelve Channel E1 Framer / 4x4 Sixteen Channel E1 Framer

Please check latest availability status for a specific part variant.


The 4 x 4 and 4 x 3 MCMs offer a high-density packaging arrangement for the DS21Q44 E1 enhanced quad framer. Either three (DS21FT44) or four (DS21FF44) silicon die of these devices is packaged in a multichip module (MCM) with the electrical connections as shown in Figure 1-1.

All of the functions available on the DS21Q44 are also available in the MCM packaged version. However, in order to minimize package size, some signals have been deleted or combined. These differences are detailed in Table 1-1. In the 4 x 3 (FT) version, the fourth quad framer is not populated and thus all the signals to and from this fourth framer are absent and should be treated as no connects (NC). Table 2-1 lists all of the signals on the MCM and it also lists the absent signals for the 4 x 3.

The availability of both a 12-channel and a 16-channel version allow the maximum framer density with the lowest cost.
DS21FF44, DS21FT44: Functional Diagram DS21FF44, DS21FT44: Functional Diagram Enlarge+

Key Features

  • 16 or 12 completely independent E1 framers in one small 27mm x 27mm package
  • Each multichip module (MCM) contains either four (FF) or three (FT) DS21Q44 die
  • Each quad framer can be concatenated into a single 8.192MHz backplane data stream
  • IEEE 1149.1 JTAG-Boundary Scan Architecture
  • DS21FF44 and DS21FT44 are pin compatible with DS21FF42 and DS21FT42, respectively, to allow the same footprint to support T1 and E1 applications
  • 300-pin MCM BGA 1.27mm pitch package (27mm x 27mm)
  • Low-power 3.3V CMOS with 5V tolerant input and outputs
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

16-Bit, 5.9Gsps Interpolating and Modulating RF DAC with JESD204B Interface

  • Simplifies RF Design and Enables New Wireless Communication Architectures
  • Direct RF Synthesis of 600MHz Bandwidth Up to 2.8GHz
  • Highly Flexible and Configurable

Electronics in Vehicles (ELIV) 2019
10/16/2019 - 10/17/2019, Bonn, Germany
The international VDI Congress ELIV (Electronics In Vehicles) is THE event for all experts in the field of electrical and electronical car engineering and integration of mechanical and electronical systems.