參數(shù)資料
型號(hào): IDT728985JG
廠(chǎng)商: IDT, Integrated Device Technology Inc
文件頁(yè)數(shù): 1/13頁(yè)
文件大小: 0K
描述: IC DGTL SW 256X256 44-PLCC
標(biāo)準(zhǔn)包裝: 27
系列: 7200
類(lèi)型: 多路復(fù)用器
電路: 1 x 8:8
獨(dú)立電路: 1
電壓電源: 單電源
電源電壓: 4.75 V ~ 5.25 V
工作溫度: -40°C ~ 85°C
安裝類(lèi)型: 表面貼裝
封裝/外殼: 44-LCC(J 形引線(xiàn))
供應(yīng)商設(shè)備封裝: 44-PLCC(16.59x16.59)
包裝: 管件
其它名稱(chēng): 728985JG
800-1994-5
IDT728985JG-ND
1
2001 Integrated Device Technology, Inc.
APRIL 2001
TIME SLOT INTERCHANGE
DIGITAL SWITCH
256 x 256
IDT728985
DSC-5708/2
.UNCTIONAL BLOCK DIAGRAM
.EATURES:
256 x 256 channel non-blocking switch
Automatic signal identification (ST-BUS, GCI)
8 RX inputs — 32 channels at 64 Kbit/s per serial line
8 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
5V Power Supply
Operating Temperature Range -40
°°°°°C to +85°°°°°C
Available in 44-pin Plastic Leaded Chip Carrier (PLCC),
44-pin Plastic Quad Flatpack (PQFP) and 40-pin Plastic Dip
(P-DIP)
DESCRIPTION:
The IDT728985 is a ST-BUS/GCI compatible digital switch controlled by
a microprocessor. The IDT728985 can handle as many as 256, 64 Kbit/s input
and output channels. Those 256 channels are divided into 8 serial inputs and
outputs, each of which consists of 32 channels. The IDT728985 provides per-
channelvariableorconstantthroughputdelaymodesandmicroprocessorread
and write access to individual channels. As an important function of a digital
switch is to maintain sequence integrity and minimize throughput delay, the
IDT728985 is an ideal solution for most switching needs.
.UNCTIONAL DESCRIPTION
Frame sequence, constant throughput delay, and guaranteed minimum
delay are high priority requirements in today’s integrated data and multimedia
networks. The IDT728985 provides these functions on a per-channel basis
usingastandardmicroprocessorcontrolinterface. Eachoftheeightseriallines
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.
Supporting both GCI and ST-BUS formats, IDT728985 has incorporated an
internal circuit to automatically identify the polarity and format of the frame
synchronization.
A functional block diagram of the IDT728985 device is shown on page 1.
The serial streams operate continuously at 2.048 Mb/s and are arranged in
125
swideframeseachcontaining32,8-bitchannels. Eightinput(RX0-7)and
Microprocessor Interface
Control Register
Timing
Unit
RX0
RX1
RX2
RX3
RX4
RX5
RX6
RX7
TX0
TX1
TX2
TX3
TX4
TX5
TX6
TX7
ODE
F0i
C4i
VCC
CS
DS
R/
W A0/
A5
GND
CCO
DTA D0/
D7
5708 drw01
Receive
Serial Data
Streams
Data
Memory
Output MUX
Connection
Memory
Transmit
Serial Data
Streams
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