DS21458 Datasheet, PDF (1/270 Pages) Dallas Semiconductor – Quad T1/E1/J1 Transceivers

DS21455/DS21458
Quad T1/E1/J1 Transceivers
www.maxim-ic.com
GENERAL DESCRIPTION
The DS21455 and DS21458 are quad monolithic
devices featuring independent transceivers that
can be software configured for T1, E1, or J1
operation. Each is composed of a line interface
unit (LIU), framer, HDLC controllers, and a
TDM backplane interface, and is controlled via
an 8-bit parallel port configured for Intel or
Motorola bus operations. The DS21455* is a
direct replacement for the older DS21Q55 quad
MCM device. The DS21458, in a smaller
package (17mm CSBGA) and featuring an
improved controller interface, is software
compatible with the older DS21Q55.
*The JTAG function on the DS21455/DS21458 is a single
controller for all four transceivers, unlike the DS21Q55, which has
a JTAG controller-per-transceiver architecture.
APPLICATIONS
Routers
Channel Service Units (CSUs)
Data Service Units (DSUs)
Muxes
Switches
Channel Banks
T1/E1 Test Equipment
ORDERING INFORMATION
PART
DS21455
DS21455N
DS21458
DS21458N
TEMP RANGE
0°C to +70°C
-40°C to +85°C
0°C to +70°C
-40°C to +85°C
PIN-PACKAGE
256 BGA
(27mm x 27mm)
256 BGA
(27mm x 27mm)
256 CSBGA
(17mm x 17mm)
256 CSBGA
(17mm x 17mm)
DALLAS is a registered trademark of Dallas Semiconductor Corp.
MAXIM is a registered trademark of Maxim Integrated Products, Inc.
FEATURES
Four Independent Transceivers, Each Having
the Following Features:
§ Complete T1 (DS1)/ISDN-PRI/J1
Transceiver Functionality
§ Complete E1 (CEPT) PCM-30/ISDN-
PRI Transceiver Functionality
§ Short- and Long-Haul Line Interface for
Clock/Data Recovery and Waveshaping
§ CMI Coder/Decoder
§ Crystal-Less Jitter Attenuator
§ Fully Independent Transmit and Receive
Functionality
§ Dual HDLC Controllers
§ On-Chip Programmable BERT Generator
and Detector
§ Internal Software-Selectable Receive-
and Transmit-Side Termination Resistors
for 75Ω/100Ω/120Ω T1 and E1
Interfaces
§ Dual Two-Frame Elastic-Store Slip
Buffers that can Connect to
Asynchronous Backplanes Up to
16.384MHz
§ 16.384MHz, 8.192MHz, 4.096MHz, or
2.048MHz Clock Output Synthesized to
Recovered Network Clock
§ Programmable Output Clocks for
Fractional T1, E1, H0, and H12
Applications
§ Interleaving PCM Bus Operation
§ 8-Bit Parallel Control Port, Multiplexed
or Nonmultiplexed, Intel or Motorola
§ IEEE 1149.1 JTAG-Boundary Scan
§ 3.3V Supply with 5V Tolerant Inputs and
Outputs
§ DS21455 Directly Replaces DS21Q55
§ Signaling System 7 (SS7) Support
§ RAI-CI, AIS-CI Support
Note: Some revisions of this device may incorporate deviations from published specifications known as errata. Multiple revisions of any device
may be simultaneously available through various sales channels. For information about device errata, click here: www.maxim-ic.com/errata.
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REV: 040804