DS21FT40

Features:

•  Twelve (12) completely independentE1 Framers in one small 27 mm x 27 mmPackage
•  Each Multi-Chip Module (MCM) ContainsThree DS21Q44 Quad E1 Framer Die
•  Each Quad Framer can be concatenated intoa Single 8.192 MHz Backplane Data Stream
•  300pin MCM 1.27 mm pitch BGA package(27 mm X 27 mm)
•  Low Power 3.3V CMOS with 5V TolerantInput & Outputs


Specifications

Voltage on Any Non-Supply Pin Relative to Ground................. 1.0V to +5.5V
Supply Voltage .........................................................................3V to +3.63V
Operating Temperature for DS21FT40 ......................................  ...0ºC to 70
Operating Temperature for DS21FT40N ..................................40ºC to +85
Storage Temperature ...........................................................55ºC to +125
Soldering Temperature ...........................................................See J-STD-020A


Description

The DS21FT40 MCM offers a high density packaging arrangement for the DS21Q44 E1 Enhanced QuadFramer. Three DS21Q44 silicon die are packaged in a Multi-Chip Module (MCM) with the electricalconnections as shown in Figure 1-1. The DS21FT40 is closely related to the DS21FT44. Most of thefunctions of the DS21FT44 are available on the DS21FT40. The differences are listed in Table 1-1.Table 2-1 lists all of the signals on the MCM.

The DS21Q44 E1 Framer is an enhanced version of the DS21Q43 Quad E1 Framer. Each DS21Q44 diecontains four framers that are configured and read through a common microprocessor-compatible parallelport. Each framer consists of a receive framer, receive elastic store, transmit formatter and transmitelastic store. All four framers in the DS21Q44 are totally independent, they do not share a commonframing synchronizer. Also, the transmit and receive sides of each framer are totally independent. Thedual two-frame elastic stores contained in each of the four framers can be independently enabled anddisabled as required. The device fully meets all of the latest E1 specifications including CCITT/ITUG.704, G.706, G.962, and I.431 as well as ETS 300 011 and ETS 300 233.