DESCRIPTION
The Quad T1 and E1 Transceiver MCMs offer a high density packaging arrangement for the DS21352/DS21552 T1 Single-Chip Transceivers and the DS21354/DS21554 E1 Single-Chip Transceivers.

FEATURES
• Four (4) Completely Independent T1 or E1 Transceivers
   In One Small 27mm x 27mm Package
• Each Transceiver Contains a Short & Long Haul Line Interface
   Plus a Full Featured Framer with Alarm Detection/Generation,
   Elastic Stores, Hardware Based Signaling Support, Per DS0
   Channel Control and HDLC Controller
• Each Multi-Chip Module (MCM) Contains Four Die of:
   DS21352 (DS21Q352)
   DS21552 (DS21Q552)
   DS21354 (DS21Q354)
   DS21554 (DS21Q554)
• Selection Guide:
               Supply             Device
   T1        3.3V                 DS21Q352
   T1        5V                    DS21Q552
   E1        3.3V                 DS21Q354
   E1        5V                    DS21Q554  

• See the Specific DS21352/DS21552 and DS21354/DS21554
   Data Sheets for Details on their Feature Set and Operation
• All Four T1 or E1 Transceivers Can be Concatenated into a Single
   8.192MHz Backplane Data Stream
• IEEE 1149.1 JTAG-Boundary Scan Architecture
• DS21Q352/DS21Q552 and DS21Q354/DS21Q554 are Pin Compatible
   to Allow the Same Footprint to Support T1 and E1 Applications
• 256–lead MCM BGA package (27mm X 27mm)
• Low Power 5V CMOS or Low Power 3.3V CMOS with 5V
   Tolerant Input & Outputs