DS21FF42 Maxim Integrated Products, DS21FF42 Datasheet - Page 15

• Manufacturer Part Number: DS21FF42
• Description: IC FRAMER T1 4X4 16CH 300-BGA
• Manufacturer: Maxim Integrated Products

Specifications of DS21FF42

• Controller Type: T1 Framer
• Interface: Parallel/Serial
• Voltage - Supply: 2.97 V ~ 3.63 V
• Current - Supply: 300mA
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 300-BGA
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

4. DS21Q42 FEATURES
§ Four T1 DS1/ISDN–PRI/J1 framing
§ All four framers are fully independent
§ Each of the four framers contain dual two-
§ 8-bit parallel control port that can be used
§ Programmable output clocks for Fractional T1
§ Fully independent transmit and receive
§ Integral HDLC controller with 64-byte buffers.
§ Generates and detects in-band loop codes from
§ Pin compatible with DS21Q44 E1 Enhanced
§ 3.3V supply with 5V tolerant I/O; low power
§ Available in 128--pin TQFP package
§ IEEE 1149.1 support
DESCRIPTION
The DS21Q42 is an enhanced version of the DS21Q41B Quad T1 Framer. The DS21Q42 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 DS21Q42 are totally independent, they do not share a common framing synchronizer.
Also the transmit and receive sides of each framer are 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 T1 specifications including ANSI T1.403–1995, ANSI T1.231–1993,
AT&T TR 62411 (12–90), AT&T TR54016, and ITU G.704 and G.706.
5. DS21Q42 INTRODUCTION
The DS21Q42 is a superset version of the popular DS21Q41 Quad T1 framer offering the new features
listed below. All of the original features of the DS21Q41 have been retained and software created for the
original device is transferable to the DS21Q42.
transceivers
frame elastic store slip buffers that can connect
to asynchronous backplanes up to 8.192 MHz
directly on either multiplexed or
nonmultiplexed buses (Intel or Motorola)
functionality
Configurable for FDL or DS0 operation
1 to 8 bits in length including CSU loop codes
Quad E1 Framer
CMOS
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FUNCTIONAL DIAGRAM
FRAMER #0
FRAMER #1
Form atter
Transm it
FRAMER #2
Receive
Fram er
FRAMER #3
Control Port
Elastic
Elastic
Store
Store