- 您現(xiàn)在的位置：買(mǎi)賣(mài)IC網(wǎng) > PDF目錄1916 > DS3254N+ (Maxim Integrated Products)IC LIU DS3/E3/STS-1 144-CSBGA PDF資料下載
參數(shù)資料
| 型號(hào)： | DS3254N+ |
| 廠(chǎng)商： | Maxim Integrated Products |
| 文件頁(yè)數(shù)： | 21/71頁(yè) |
| 文件大?。?/td> | 0K |
| 描述： | IC LIU DS3/E3/STS-1 144-CSBGA |
| 產(chǎn)品培訓(xùn)模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標(biāo)準(zhǔn)包裝： | 160 |
| 類(lèi)型： | 線(xiàn)路接口裝置（LIU） |
| 驅(qū)動(dòng)器/接收器數(shù)： | 4/4 |
| 規(guī)程： | IEEE 1149.1 |
| 電源電壓： | 3.135 V ~ 3.465 V |
| 安裝類(lèi)型： | 表面貼裝 |
| 封裝/外殼： | 144-BGA，CSPBGA |
| 供應(yīng)商設(shè)備封裝： | 144-TECSBGA（13x13） |
| 包裝： | 托盤(pán) |
第1頁(yè)第2頁(yè)第3頁(yè)第4頁(yè)第5頁(yè)第6頁(yè)第7頁(yè)第8頁(yè)第9頁(yè)第10頁(yè)第11頁(yè)第12頁(yè)第13頁(yè)第14頁(yè)第15頁(yè)第16頁(yè)第17頁(yè)第18頁(yè)第19頁(yè)第20頁(yè)當(dāng)前第21頁(yè)第22頁(yè)第23頁(yè)第24頁(yè)第25頁(yè)第26頁(yè)第27頁(yè)第28頁(yè)第29頁(yè)第30頁(yè)第31頁(yè)第32頁(yè)第33頁(yè)第34頁(yè)第35頁(yè)第36頁(yè)第37頁(yè)第38頁(yè)第39頁(yè)第40頁(yè)第41頁(yè)第42頁(yè)第43頁(yè)第44頁(yè)第45頁(yè)第46頁(yè)第47頁(yè)第48頁(yè)第49頁(yè)第50頁(yè)第51頁(yè)第52頁(yè)第53頁(yè)第54頁(yè)第55頁(yè)第56頁(yè)第57頁(yè)第58頁(yè)第59頁(yè)第60頁(yè)第61頁(yè)第62頁(yè)第63頁(yè)第64頁(yè)第65頁(yè)第66頁(yè)第67頁(yè)第68頁(yè)第69頁(yè)第70頁(yè)第71頁(yè)
DS3251/DS3252/DS3253/DS3254
28 of 71
9.4 Waveshaping, Line Build-Out, Line Driver
The waveshaping block converts the transmit clock, positive data, and negative data signals into a single AMI
signal with the waveshape required for interfacing to DS3/E3/STS-1 lines. Table 9-A through Table 9-E and Figure
9-1 show the waveform template specifications and test parameters.
Because DS3 and STS-1 signals must meet the waveform templates at the cross-connect through any cable length
from 0 to 450ft, the waveshaping circuitry includes a selectable LBO feature. For cable lengths of 225ft or greater,
the TLBO pin (hardware mode) or the TLBO configuration bit in the TCR register (CPU bus mode) should be low.
When TLBO is low, output pulses are driven onto the coaxial cable without any preattenuation. For cable lengths
less than 225ft, TLBO should be high to enable the LBO circuitry. When TLBO is high, pulses are preattenuated by
the LBO circuitry before being driven onto the coaxial cable. The LBO circuitry provides attenuation that mimics the
attenuation of 225ft of coaxial cable.
The transmitter line driver can be disabled and the TXP and TXN outputs tri-stated by asserting the
TTS input or
the TTS configuration bit in the TCR register. Powering down the transmitter through the TPD configuration bit in
the TCR register (CPU bus mode) also tri-states the TXP and TXN outputs.
9.5 Interfacing to the Line
The transmitter interfaces to the outgoing DS3/E3/STS-1 coaxial cable (75
) through a 2:1 step-down transformer
connected to the TXP and TXN pins. Figure 2-1 shows the arrangement of the transformer and other
recommended interface components. Table 14-A specifies the required characteristics of the transformer.
9.6 Transmit Driver Monitor
The transmit driver monitor compares the amplitude of the transmit waveform to thresholds VTXMIN and VTXMAX. If
the amplitude is less than VTXMIN or greater than VTXMAX for approximately 32 MCLK cycles, then the monitor
activates the
TDM output pin (hardware mode or CPU bus mode) or sets the TDM status bit in the SR register and
optionally activates the
INT output (CPU bus mode). When the transmitter is tri-stated, the transmit driver monitor is
also disabled.
Note that the transmit driver monitor can be affected by reflections caused by shorts and opens on the line. A short
at a distance less than a few inches (~11 inches for FR4 material) can introduce inverted reflections that reduce the
outgoing pulse amplitude below the VTXMIN threshold and thereby activate the TDM pin and/or TDM status bit.
Similarly an open circuit a similar distance away can introduce noninverted reflections that increase the outgoing
amplitude above the VTXMAX threshold and thereby activate TDM and/or TDM. Shorts and opens at larger distances
away from TXP/TXN can also activate
TDM and/or TDM, but this effect is data-pattern dependent.
9.7 Transmitter Power-Down
To minimize power consumption when the transmitter is not being used, assert the TPD configuration bit in the
TCR register (CPU bus mode only). When the transmitter is powered down, the TXP and TXN pins are put in a
high-impedance state and the transmit amplifiers are powered down.
9.8 Transmitter Jitter Generation (Intrinsic)
The transmitter meets the jitter generation requirements of all applicable standards, with or without the jitter
attenuator enabled.
9.9 Transmitter Jitter Transfer
Without the jitter attenuator enabled in the transmit side, the transmitter passes jitter through unchanged. With the
jitter attenuator enabled in the transmit side, the transmitter meets the jitter transfer requirements of all applicable
telecommunication standards in Table 1-A. See Figure 10-1.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| DS33M33N+ | IC MAPPER ETHERNET 256CSBGA |
| DS33R11+CJ2 | IC ETH TXRX T1/E1/J1 256-BGA |
| DS33R41+ | IC TXRX ETHERNET MAP 400-BGA |
| DS33W11DK+ | IC MAPPING ETHERNET 256-CSBGA |
| DS33Z11+UNUSED | IC ETHERNET MAPPER 169-CSBGA |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DS3254N# | 功能描述:網(wǎng)絡(luò)控制器與處理器 IC Quad DS3/E3/STS-1 Line Interface Unit RoHS:否 制造商:Micrel 產(chǎn)品:Controller Area Network (CAN) 收發(fā)器數(shù)量: 數(shù)據(jù)速率: 電源電流（最大值）:595 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PBGA-400 封裝:Tray |
| DS3254N+ | 功能描述:網(wǎng)絡(luò)控制器與處理器 IC Quad DS3/E3/STS-1 Line Interface Unit RoHS:否 制造商:Micrel 產(chǎn)品:Controller Area Network (CAN) 收發(fā)器數(shù)量: 數(shù)據(jù)速率: 電源電流（最大值）:595 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PBGA-400 封裝:Tray |
| DS3254NA3 | 制造商:Maxim Integrated Products 功能描述:QUAD ENH DS3/E3 LIU REV A3 IND - Rail/Tube |
| DS3256 | 功能描述:網(wǎng)絡(luò)控制器與處理器 IC X6 T3/E3 Line Interface Unit RoHS:否 制造商:Micrel 產(chǎn)品:Controller Area Network (CAN) 收發(fā)器數(shù)量: 數(shù)據(jù)速率: 電源電流（最大值）:595 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PBGA-400 封裝:Tray |
| DS3256N | 功能描述:網(wǎng)絡(luò)控制器與處理器 IC X6 T3/E3 Line Interface Unit RoHS:否 制造商:Micrel 產(chǎn)品:Controller Area Network (CAN) 收發(fā)器數(shù)量: 數(shù)據(jù)速率: 電源電流（最大值）:595 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PBGA-400 封裝:Tray |
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。