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IDT72V8988 Datasheet(PDF) 1 Page - Integrated Device Technology

Part No. IDT72V8988
Description  3.3 VOLT TIME SLOT INTERCHANGE DIGITAL SWITCH 128 x 128
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Maker  IDT [Integrated Device Technology]
Homepage  http://www.idt.com
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IDT72V8988 Datasheet(HTML) 1 Page - Integrated Device Technology

 
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1
AUGUST 2003
3.3 VOLT TIME SLOT INTERCHANGE
DIGITAL SWITCH
128 x 128
IDT72V8988
2003 Integrated Device Technology, Inc. All rights reserved. Product specifications subject to change without notice.
DSC-5704/5
IDT and the IDT logo are registered trademarks of Integrated Device Technology, Inc. The ST-BUSis a trademark of Mitel Corp.
FUNCTIONAL BLOCK DIAGRAM
Microprocessor Interface
Control Register
Timing
Unit
RX0
RX1
RX2
RX3
TX0
TX1
TX2
TX3
ODE
F0i
C4i
VCC
CS
DS
R/
W A0/
A5
GND
DTA D0/
D7
5704 drw01
Data
Memory
Output MUX
Connection
Memory
Receive
Serial Data
Streams
Transmit
Serial Data
Streams
FEATURES:
••••• 128 x 128 channel non-blocking switch
••••• Automatic signal identification (ST-BUS®, GCI)
••••• 4 RX inputs—32 channels at 64 Kbit/s per serial line
••••• 4 TX outputs—32 channels at 64 Kbit/s per serial line
••••• Three-state serial outputs
••••• Microprocessor Interface (8-bit data bus)
••••• Frame Integrity for data applications
••••• 3.3V Power Supply
••••• Available in 44-pin Plastic Leaded Chip Carrier (PLCC), and
44-pin Plastic Quad Flatpack (PQFP)
••••• Operating Temperature Range -40
°°°°°C to +85°°°°°C
••••• 3.3V I/O with 5V Tolerant Inputs
DESCRIPTION:
The IDT72V8988 is an ST-BUS®/GCI compatible digital switch controlled
by a microprocessor. The IDT72V8988 can handle as many as 128, 64 Kbit/s
input and output channels. Those 128 channels are divided into 4 serial inputs
andoutputs,eachofwhichconsistsof32channels.TheIDT72V8988provides
per-channelvariableorconstantthroughputdelaymodesandmicroprocessor
readandwriteaccesstoindividualchannels. Asanimportantfunctionofadigital
switch is to maintain sequence integrity and minimize throughput delay, the
IDT72V8988 is an ideal solution for most switching needs.
FUNCTIONAL DESCRIPTION
Frame sequence, constant throughput delay, and guaranteed minimum
delay are high priority requirements in today’s integrated data and multimedia
networks. The IDT72V8988 provides these functions on a per-channel basis
using a standard microprocessor control interface. Each of the four serial lines
is designed to switch 64 Kbit/s PCM or N x 64 Kbit/s data.
InProcessorMode,themicroprocessorcanaccesstheinputandoutputtime
slots to control other devices such as ISDN transceivers and trunk interfaces.
SupportingbothGCIandST-BUS® formats,IDT72V8988hasincorporatedan
internal circuit to automatically identify the polarity and format of the frame
synchronization.
A functional block diagram of the IDT72V8988 device is shown on page 1.
The serial streams operate continuously at 2.048 Mb/s and are arranged in
125
µswideframeseachcontaining32,8-bitchannels. Fourinput(RX0-3)and


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