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參數(shù)資料
| 型號： | IDT82P2521BH |
| 廠商： | IDT, Integrated Device Technology Inc |
| 文件頁數(shù)： | 80/147頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC LIU E1 21+1CH SHORT 640-PBGA |
| 標準包裝： | 5 |
| 類型： | 線路接口裝置（LIU） |
| 規(guī)程： | E1 |
| 電源電壓： | 3.135 V ~ 3.465 V |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 640-BGA 裸露焊盤 |
| 供應商設備封裝： | 640-PBGA-EP（31x31） |
| 包裝： | 托盤 |
| 其它名稱： | 82P2521BH |
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IDT82P2521
21(+1) CHANNEL HIGH-DENSITY E1 LINE INTERFACE UNIT
Functional Description
38
December 7, 2005
3.2.5
LINE DRIVER
The Line Driver can be set to High-Z for protection or in redundant
applications.
The following two ways will set the Line Driver to High-Z:
Setting the OE pin to low will globally set all the Line Drivers to
High-Z;
Setting the OE bit (b6, TCF0,...) to ‘0’ will set the corresponding
Line Driver to High-Z.
By these ways, the functionality of the internal circuit is not affected
and TTIPn and TRINGn will enter High-Z state immediately.
3.2.5.1 Transmit Over Current Protection
The Line Driver monitors the Transmit Over Current (TOC) on the
line interface. When TOC is detected, the driver’s output (i.e., output on
TTIPn/TRINGn) is determined by the THZ_OC bit (b4, TCF0,...). If the
THZ_OC bit (b4, TCF0,...) is ‘0’, the driver’s output current (peak to
peak) is limited to 100 mA; if the THZ_OC bit (b4, TCF0,...) is ‘1’, the
driver’s output will enter High-Z. TOC is indicated by the TOC_S bit (b4,
STAT0,...). A transition from ‘0’ to ‘1’ on the TOC_S bit (b4, STAT0,...) or
any transition (from ‘0’ to ‘1’ or from ‘1’ to ‘0’) on the TOC_S bit (b4,
STAT0,...) will set the TOC_IS bit (b4, INTS0,...) to ‘1’, as selected by the
TOC_IES bit (b4, INTES,...). When the TOC_IS bit (b4, INTS0,...) is ‘1’,
an interrupt will be reported by INT if not masked by the TOC_IM bit (b4,
TOC may be indicated by the TMFn pin. Refer to Section 3.4.7.2
TMFn Indication for details.
3.2.6
TX TERMINATION
The transmit line interface supports Transmit Differential mode and
Transmit Single Ended mode, as selected by the T_SING bit (b3,
TCF0,...). In Transmit Differential mode, both TTIPn and TRINGn are
used to transmit signals to the line side. In Transmit Single Ended mode,
only TTIPn is used to transmit signal.
The line interface can be connected with E1 120
twisted pair cable
or E1 75
coaxial cable.
The transmit impedance matching is realized by using internal
impedance matching or external impedance matching for each channel
in different applications.
3.2.6.1 Transmit Differential Mode
In Transmit Differential mode, different applications have different
impedance matching. For E1 applications, both Internal and External
Impedance Matching are supported.
Internal Impedance Matching circuit uses an internal programmable
resistor (IM) only.
External Impedance Matching circuit uses an external resistor (Rt)
only.
A twisted pair cable can be connected with a 1:2 (step up) trans-
former or without a transformer (transformer-less), while a coaxial cable
must be connected with a 1:2 transformer.
The T_TERM[2:0] bits (b2~0, TCF0,...) should be set according to
different cable conditions, whether a transformer is used, and what kind
of Impedance Matching is selected.
Table-7 lists the recommended impedance matching value in
one channel in different applications.
The transformer-less connection will offer a termination option with
reduced cost and board space. However, the waveform amplitude is not
standard compliant, and surge protection and common mode depres-
sion should be enhanced depending on equipment environment..
Table-7 Impedance Matching Value in Transmit Differential Mode
Cable Condition
Internal Impedance Matching
External Impedance Matching
T_TERM[2:0]
Rt
T_TERM[2:0]
Rt
E1 120
twisted pair (with transformer), PULS[3:0]=0001
010
0
111
10
E1 75
coaxial (with transformer), PULS[3:0]=0000
011
E1 120
twisted pair (transformer-less), PULS[3:0]=0001
110
(not supported)
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| IDT82P2521BHBLANK | 制造商:IDT 制造商全稱:Integrated Device Technology 功能描述:21(1) Channel High-Density E1 Line Interface Unit |
| IDT82P2521BHG | 功能描述:IC LIU E1 21+1CH SHORT 640-PBGA RoHS:是 類別:集成電路 (IC) >> 接口 - 驅動器，接收器，收發(fā)器 系列:- 標準包裝:250 系列:- 類型:收發(fā)器 驅動器/接收器數(shù):2/2 規(guī)程:RS232 電源電壓:3 V ~ 5.5 V 安裝類型:表面貼裝 封裝/外殼:16-TSSOP（0.173"，4.40mm 寬） 供應商設備封裝:16-TSSOP 包裝:帶卷 (TR) |
| IDT82P2521BHGBLANK | 制造商:IDT 制造商全稱:Integrated Device Technology 功能描述:21(1) Channel High-Density E1 Line Interface Unit |
| IDT82P2808 | 制造商:IDT 制造商全稱:Integrated Device Technology 功能描述:8(+1) Channel High-Density T1/E1/J1 Line Interface Unit |
| IDT82P2808BB | 功能描述:IC LIU T1/J1/E1 8+1CH 416-PBGA RoHS:否 類別:集成電路 (IC) >> 接口 - 驅動器，接收器，收發(fā)器 系列:- 標準包裝:1,000 系列:- 類型:收發(fā)器 驅動器/接收器數(shù):2/2 規(guī)程:RS232 電源電壓:3 V ~ 5.5 V 安裝類型:表面貼裝 封裝/外殼:16-SOIC（0.295"，7.50mm 寬） 供應商設備封裝:16-SOIC 包裝:帶卷 (TR) |
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