參數(shù)資料
型號(hào)： MAX3441EAPA
廠商： MAXIM INTEGRATED PRODUCTS INC
元件分類： 通用總線功能
英文描述： 【15kV ESD-Protected, 【60V Fault-Protected, 10Mbps, Fail-Safe RS-485/J1708 Transceivers
中文描述： LINE TRANSCEIVER, PDIP8
封裝： 0.300 INCH, PLASTIC, MS-001AB, DIP-8
文件頁(yè)數(shù)： 15/20頁(yè)
文件大小： 368K
代理商： MAX3441EAPA
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 = t
RISE
/ (10 x 1.5ns/ft)
where t
RISE
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.
M
±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
相關(guān)PDF資料
PDF描述
MAX3442EAPA 【15kV ESD-Protected, 【60V Fault-Protected, 10Mbps, Fail-Safe RS-485/J1708 Transceivers
MAX3443EAPA 【15kV ESD-Protected, 【60V Fault-Protected, 10Mbps, Fail-Safe RS-485/J1708 Transceivers
MAX3444EAPA 【15kV ESD-Protected, 【60V Fault-Protected, 10Mbps, Fail-Safe RS-485/J1708 Transceivers
MAX3440EAPA 【15kV ESD-Protected, 【60V Fault-Protected, 10Mbps, Fail-Safe RS-485/J1708 Transceivers
MAX3440EASA 【15kV ESD-Protected, 【60V Fault-Protected, 10Mbps, Fail-Safe RS-485/J1708 Transceivers
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MAX3441EASA 功能描述:RS-485接口IC RoHS:否 制造商:Texas Instruments 數(shù)據(jù)速率:250 Kbps 工作電源電壓:3.3 V 電源電流:750 uA 工作溫度范圍:- 40 C to + 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube
MAX3441EASA+ 功能描述:RS-485接口IC 10Mbps Fail-Safe RS-485/J1708 Tcvr RoHS:否 制造商:Texas Instruments 數(shù)據(jù)速率:250 Kbps 工作電源電壓:3.3 V 電源電流:750 uA 工作溫度范圍:- 40 C to + 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube
MAX3441EASA+T 功能描述:RS-485接口IC 10Mbps Fail-Safe RS-485/J1708 Tcvr RoHS:否 制造商:Texas Instruments 數(shù)據(jù)速率:250 Kbps 工作電源電壓:3.3 V 電源電流:750 uA 工作溫度范圍:- 40 C to + 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube
MAX3441EASA-T 功能描述:RS-485接口IC RoHS:否 制造商:Texas Instruments 數(shù)據(jù)速率:250 Kbps 工作電源電壓:3.3 V 電源電流:750 uA 工作溫度范圍:- 40 C to + 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube
MAX3441EEPA 功能描述:RS-485接口IC RoHS:否 制造商:Texas Instruments 數(shù)據(jù)速率:250 Kbps 工作電源電壓:3.3 V 電源電流:750 uA 工作溫度范圍:- 40 C to + 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube
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