- 您現(xiàn)在的位置：買(mǎi)賣IC網(wǎng) > PDF目錄9526 > MAX9157EGJ+ (Maxim Integrated Products)IC TXRX QUAD LVDS 32-TQFN PDF資料下載
參數(shù)資料
| 型號(hào)： | MAX9157EGJ+ |
| 廠商： | Maxim Integrated Products |
| 文件頁(yè)數(shù)： | 15/16頁(yè) |
| 文件大?。?/td> | 0K |
| 描述： | IC TXRX QUAD LVDS 32-TQFN |
| 產(chǎn)品培訓(xùn)模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標(biāo)準(zhǔn)包裝： | 60 |
| 類型： | 收發(fā)器 |
| 驅(qū)動(dòng)器/接收器數(shù)： | 4/4 |
| 規(guī)程： | LVDS |
| 電源電壓： | 3 V ~ 3.6 V |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 32-WFQFN 裸露焊盤(pán) |
| 供應(yīng)商設(shè)備封裝： | 32-TQFN-EP（5x5） |
| 包裝： | 管件 |
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)當(dāng)前第15頁(yè)第16頁(yè)
MAX9157
Detailed Description
The MAX9157 is a four-channel, 200Mbps, 3.3V BLVDS
transceiver in 32-lead TQFP and QFN packages, ideal
for driving heavily loaded multipoint buses, typically 16
to 20 cards plugged into a backplane. The MAX9157
receivers accept a differential input and have a fail-safe
input circuit. The devices detect differential signals as
low as 100mV and as high as VCC.
The MAX9157 driver outputs use a current-steering
configuration to generate a 9.25mA to 17mA output
current. This current-steering approach induces less
ground bounce and no shoot-through current, enhanc-
ing noise margin and system speed performance. The
outputs are short-circuit current limited.
The MAX9157 current-steering output requires a resis-
tive load to terminate the signal and complete the trans-
mission loop. Because the devices switch the direction
of current flow and not voltage levels, the output volt-
age swing is determined by the value of the termination
resistor multiplied by the output current. With a typical
15mA output current, the MAX9157 produces a 405mV
output voltage when driving a bus terminated with two
54
resistors (15mA 27 = 405mV). Logic states are
determined by the direction of current flow through the
termination resistor.
Fail-Safe Receiver Inputs
The fail-safe feature of the MAX9157 sets the output
high when the differential input is:
Open
Undriven and shorted
Undriven and terminated
Without a fail-safe circuit, when the input is undriven,
noise at the input may switch the outputs and it may
appear to the system that data is being sent. Open or
undriven terminated input conditions can occur when a
cable is disconnected or cut, or when driver output is in
high impedance. A shorted input can occur because of
a cable failure.
When the input is driven with a differential signal with a
common-mode voltage of 0.05V to 2.4V, the fail-safe
circuit is not activated. If the input is open, undriven
and shorted, or undriven and parallel terminated, an
internal resistor in the fail-safe circuit pulls both inputs
above VCC - 0.3V, activating the fail-safe circuit and
forcing the outputs high (Figure 1).
Effect of Capacitive Loading
The characteristic impedance of a differential PC board
trace is uniformly reduced when equal capacitive loads
are attached at equal intervals (provided the transition
time of the signal being driven on the trace is longer
than the delay between loads). This kind of loading is
typical of multipoint buses where cards are attached at
1in or 0.8in intervals along the length of a backplane.
The reduction in characteristic impedance is approxi-
mated by the following formula:
ZDIFF-loaded = ZDIFF-unloaded
SQRT [Co / (Co + N
CL / L)]
where:
ZDIFF-unloaded = unloaded differential characteristic
impedance
Co = unloaded trace capacitance (pF/unit length)
CL = value of each capacitive load (pF)
N = number of capacitive loads
L = trace length
For example, if Co = 2.5pF/in, CL = 10pF, N = 18, L =
18in, and ZDIFF-unloaded = 120
, the loaded differen-
tial impedance is:
ZDIFF-loaded = 120
SQRT [2.5pF / (2.5pF + 18 x 10pF / 18in)]
ZDIFF-loaded = 54
In this example, capacitive loading reduces the charac-
teristic impedance from 120
to 54. The load seen by
Quad Bus LVDS Transceiver
8
_______________________________________________________________________________________
DO_+/RIN_+
VCC - 0.3V
D0_-/RIN_-
RO_
RIN2
VCC
RIN1
MAX9157
Figure 1. Internal Fail-Safe Circuit
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MS27467E23B2S | CONN PLUG 85POS STRAIGHT W/SCKT |
| V28A3V3M150BL | CONVERTER MOD DC/DC 3.3V 150W |
| MS27467T23A2S | CONN PLUG 85POS STRAIGHT W/SCKT |
| V28A3V3M150B3 | CONVERTER MOD DC/DC 3.3V 150W |
| MS27467E23A2S | CONN PLUG 85POS STRAIGHT W/SCKT |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX9157EGJ+ | 功能描述:LVDS 接口集成電路 Quad Bus LVDS Transceiver RoHS:否 制造商:Texas Instruments 激勵(lì)器數(shù)量:4 接收機(jī)數(shù)量:4 數(shù)據(jù)速率:155.5 Mbps 工作電源電壓:5 V 最大功率耗散:1025 mW 最大工作溫度:+ 85 C 封裝 / 箱體:SOIC-16 Narrow 封裝:Reel |
| MAX9157EGJ+T | 功能描述:LVDS 接口集成電路 Quad Bus LVDS Transceiver RoHS:否 制造商:Texas Instruments 激勵(lì)器數(shù)量:4 接收機(jī)數(shù)量:4 數(shù)據(jù)速率:155.5 Mbps 工作電源電壓:5 V 最大功率耗散:1025 mW 最大工作溫度:+ 85 C 封裝 / 箱體:SOIC-16 Narrow 封裝:Reel |
| MAX9157EGJ-T | 功能描述:LVDS 接口集成電路 Quad Bus LVDS Transceiver RoHS:否 制造商:Texas Instruments 激勵(lì)器數(shù)量:4 接收機(jī)數(shù)量:4 數(shù)據(jù)速率:155.5 Mbps 工作電源電壓:5 V 最大功率耗散:1025 mW 最大工作溫度:+ 85 C 封裝 / 箱體:SOIC-16 Narrow 封裝:Reel |
| MAX9157EHJ | 功能描述:緩沖器和線路驅(qū)動(dòng)器 RoHS:否 制造商:Micrel 輸入線路數(shù)量:1 輸出線路數(shù)量:2 極性:Non-Inverting 電源電壓-最大:+/- 5.5 V 電源電壓-最小:+/- 2.37 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Reel |
| MAX9157EHJ+ | 功能描述:LVDS 接口集成電路 Quad Bus LVDS Transceiver RoHS:否 制造商:Texas Instruments 激勵(lì)器數(shù)量:4 接收機(jī)數(shù)量:4 數(shù)據(jù)速率:155.5 Mbps 工作電源電壓:5 V 最大功率耗散:1025 mW 最大工作溫度:+ 85 C 封裝 / 箱體:SOIC-16 Narrow 封裝:Reel |
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。