(1 PC) DS21Q42T IC DALLAS SEMI TELECOM INTERFACE 128LQFP
Tax included.
THIS IS FOR (1 PC) OF DS21Q42T BY DALLAS SEMI
TELECOM INTERFACE 128LQFP
FEATURES
Four T1 DS1/ISDN-PRI/J1 framing
transceivers
All four framers are fully independent
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)
Programmable output clocks for Fractional T1
Fully independent transmit and receive
functionality
Integral HDLC controller with 64-byte buffers
configurable for FDL or DS0 operation
Generates and detects in-band loop codes from
1 to 8 bits in length including CSU loop codes
Pin compatible with DS21Q44 E1 enhanced
quad E1 framer
3.3V supply with 5V tolerant I/O; low-power
CMOS
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.
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 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.