参数资料
| 型号： | MAX3444EESA+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 7/19页 |
| 文件大小： | 0K |
| 描述： | IC TXRX J1708 8-SOIC |
| 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： | 1/1 |
| 规程： | J1708 |
| 电源电压： | 4.75 V ~ 5.25 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SOIC |
| 包装： | 带卷 (TR) |
In general, a transmitter’s rise time relates directly to
the length of an unterminated stub, which can be dri-
ven with only minor waveform reflections. The following
equation expresses this relationship conservatively:
Length = tRISE / (10 x 1.5ns/ft)
where tRISE is the transmitter’s rise time.
For example, the MAX3442E’s rise time is typically
800ns, which results in excellent waveforms with a stub
length up to 53ft. A system can work well with longer
unterminated stubs, even with severe reflections, if the
waveform settles out before the UART samples them.
RS-485 Applications
The MAX3440E–MAX3443E transceivers provide bidi-
rectional data communications on multipoint bus trans-
mission lines. Figures 13 and 14 show a typical network
applications circuit. The RS-485 standard covers line
lengths up to 4000ft. To minimize reflections and
reduce data errors, terminate the signal line at both
ends in its characteristic impedance, and keep stub
lengths off the main line as short as possible.
J1708 Applications
The MAX3444E is designed for J1708 applications. To
configure the MAX3444E, connect DE and RE to GND.
Connect the signal to be transmitted to TXD. Terminate
the bus with the load circuit as shown in Figure 15. The
drivers used by SAE J1708 are used in a dominant-
mode application. DE is active low; a high input on DE
places the outputs in high impedance. When the driver is
disabled (TXD high or DE high), the bus is pulled high by
external bias resistors R1 and R2. Therefore, a logic level
high is encoded as recessive. When all transceivers are
idle in this configuration, all receivers output logic high
because of the pullup resistor on A and pulldown resistor
on B. R1 and R2 provide the bias for the recessive state.
C1 and C2 combine to form a 6MHz lowpass filter, effec-
tive for reducing FM interference. R2, C1, R4, and C2
combine to form a 1.6MHz lowpass filter, effective for
reducing AM interference. Because the bus is untermi-
nated, at high frequencies, R3 and R4 perform a
pseudotermination. This makes the implementation more
flexible, as no specific termination nodes are required at
the ends of the bus.
MAX3440E–MAX3444E
±15kV ESD-Protected, ±60V Fault-Protected,
10Mbps, Fail-Safe RS-485/J1708 Transceivers
______________________________________________________________________________________
15
5.00MHz
500kHz/div
0
20dB/div
2V/div
Figure 11. Driver Output Waveform and FFT Plot of MAX3443E
Transmitting a 125kHz Signal
5.00MHz
500kHz/div
0
20dB/div
2V/div
Figure 12. Driver Output Waveform and FFT Plot of MAX3442E
Transmitting a 125kHz Signal
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相关代理商/技术参数 |
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| MAX3444ESA | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| MAX34451ETN+ | 功能描述:电压监测器/监控器 PMBUS 16Ch V/I Monitor RoHS:否 制造商:Texas Instruments 监测电压数:2 监测电压:Adjustable 输出类型:Open Drain 欠电压阈值: 过电压阈值: 准确性:1 % 工作电源电压:1.5 V to 6.5 V 工作电源电流:1.8 uA 最大工作温度:+ 125 C 封装 / 箱体:SON-6 安装风格:SMD/SMT |
| MAX34451ETN+T | 制造商:Maxim Integrated Products 功能描述:PMBUS 16-CHANNEL V/I MONITOR & 12-C - Tape and Reel 制造商:Maxim Integrated Products 功能描述:IC MONITOR PMBUS 16CH V/I TQFN 制造商:Maxim Integrated Products 功能描述:PMBUS 16Ch V/I Monitor |
| MAX34451EVKIT# | 功能描述:电源管理IC开发工具 KIT FOR PMBUS V/I MONITOR & SEQUENCER RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
| MAX34460ETM+ | 功能描述:电压监测器/监控器 12Chl PMBus System Manager RoHS:否 制造商:Texas Instruments 监测电压数:2 监测电压:Adjustable 输出类型:Open Drain 欠电压阈值: 过电压阈值: 准确性:1 % 工作电源电压:1.5 V to 6.5 V 工作电源电流:1.8 uA 最大工作温度:+ 125 C 封装 / 箱体:SON-6 安装风格:SMD/SMT |
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