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| 型号： | MAX9157EGJ+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 15/16页 |
| 文件大小： | 0K |
| 描述： | IC TXRX QUAD LVDS 32-TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 类型： | 收发器 |
| 驱动器/接收器数： | 4/4 |
| 规程： | LVDS |
| 电源电压： | 3 V ~ 3.6 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 32-WFQFN 裸露焊盘 |
| 供应商设备封装： | 32-TQFN-EP（5x5） |
| 包装： | 带卷 (TR) |
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
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX9157EHJ | 功能描述:缓冲器和线路驱动器 RoHS:否 制造商:Micrel 输入线路数量:1 输出线路数量:2 极性:Non-Inverting 电源电压-最大:+/- 5.5 V 电源电压-最小:+/- 2.37 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:MSOP-8 封装:Reel |
| MAX9157EHJ+ | 功能描述:LVDS 接口集成电路 Quad Bus LVDS Transceiver RoHS:否 制造商:Texas Instruments 激励器数量:4 接收机数量:4 数据速率:155.5 Mbps 工作电源电压:5 V 最大功率耗散:1025 mW 最大工作温度:+ 85 C 封装 / 箱体:SOIC-16 Narrow 封装:Reel |
| MAX9157EHJ+T | 功能描述:LVDS 接口集成电路 Quad Bus LVDS Transceiver RoHS:否 制造商:Texas Instruments 激励器数量:4 接收机数量:4 数据速率:155.5 Mbps 工作电源电压:5 V 最大功率耗散:1025 mW 最大工作温度:+ 85 C 封装 / 箱体:SOIC-16 Narrow 封装:Reel |
| MAX9157EHJ-T | 功能描述:缓冲器和线路驱动器 RoHS:否 制造商:Micrel 输入线路数量:1 输出线路数量:2 极性:Non-Inverting 电源电压-最大:+/- 5.5 V 电源电压-最小:+/- 2.37 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:MSOP-8 封装:Reel |
| MAX9158 | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:Quad Bus LVDS Transceiver in 44 QFN |
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