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| 型號： | MAX13451EAUD+ |
| 廠商： | Maxim Integrated Products |
| 文件頁數(shù)： | 6/17頁 |
| 文件大?。?/td> | 0K |
| 描述： | TXRX RS-485 14TSSOP |
| 產(chǎn)品培訓模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標準包裝： | 96 |
| 類型： | 收發(fā)器 |
| 驅(qū)動器/接收器數(shù)： | 1/1 |
| 規(guī)程： | RS485 |
| 電源電壓： | 4.5 V ~ 5.5 V |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 14-TSSOP （0.173"，4.40mm 寬）裸露焊盤 |
| 供應(yīng)商設(shè)備封裝： | 14-TSSOP-EP |
| 包裝： | 管件 |
RS-485 Transceivers with Integrated
100/120 Termination Resistors
MAX13450E/MAX13451E
14 _____________________________________________________________________________________
Thermal Shutdown
When the devices’ temperature goes over +150NC, the
termination resistor turns off, and the transmitter shuts
down while the receiver stays active.
Fail Safe
The MAX13450E guarantee a logic-high receiver output
when the receiver inputs are shorted or open, or when
they are connected to a terminated transmission line with
all drivers disabled. This is done by setting the receiver
input threshold between -50mV and -200mV. If the dif-
ferential receiver input voltage (A - B) is greater than
or equal to -50mV, RO is logic-high. If (A - B) is less
than or equal to -200mV, RO is logic-low. In the case
of a terminated bus with all transmitters disabled, the
receiver’s differential input voltage is pulled to 0V by the
termination resistor. With the receiver thresholds of the
MAX13450E, this results in RO being logic-high.
The MAX13451E has the same fail-safe receiver behavior
as the MAX13450E when the INV input is low. When the
INV input is high, RO is low under the fail-safe condition.
ESD Protection
As with all Maxim devices, ESD-protection structures
are incorporated on all pins to protect against elec-
trostatic discharges encountered during handling and
assembly. The driver outputs and receiver inputs of the
MAX13450E/MAX13451E have extra protection against
static electricity. The ESD structures withstand high ESD
in all states: normal operation, shutdown, and powered
down. After an ESD event, the MAX13450E/MAX13451E
keep working without latchup or damage.
ESD protection can be tested in various ways. The trans-
mitter outputs and receiver inputs of the MAX13450E/
MAX13451E are characterized for protection to the fol-
lowing limits:
Q30kV using the Human Body Model
Q15kV using the Air Gap Discharge Method specified
in IEC 61000-4-2
Q7kV using the Contact Discharge Method specified
in IEC 61000-4-2
ESD Test Conditions
ESD performance depends on a variety of conditions.
Contact Maxim for a reliability report that documents test
setup, test methodology, and test results.
Human Body Model
Figure 11a shows the Human Body Model, and Figure
11b shows the current waveform it generates when dis-
charged into a low impedance. This model consists of a
100pF capacitor charged to the ESD voltage of interest,
which is then discharged into the test device through a
1.5kI resistor.
IEC 61000-4-2
The IEC 61000-4-2 standard covers ESD testing and
performance of finished equipment. However, it does not
specifically refer to integrated circuits. The MAX13450E/
MAX13451E help equipment designs to meet IEC 61000-
4-2, without the need for additional ESD-protection
components. The major difference between tests done
using the Human Body Model and IEC 61000-4-2 is
higher peak current in IEC 61000-4-2 because series
resistance is lower in the IEC 61000-4-2 model. Hence,
the ESD withstand voltage measured to IEC 61000-4-2
is generally lower than that measured using the Human
Body Model. Figure 11c shows the IEC 61000-4-2 model,
and Figure 11d shows the current waveform for the IEC
61000-4-2 ESD Contact Discharge test.
Applications Information
Typical Applications
The MAX13450E transceiver is designed for full-duplex,
bidirectional data communications on point-to-point
or multipoint bus transmission lines (Figure 12). The
MAX13451E transceiver is designed for half-duplex,
bidirectional data communications on point-to-point or
multipoint bus transmission lines (Figure 13).
256 Transceivers on the Bus
The standard RS-485 receiver input impedance is one-
unit load, and the standard driver can drive up to 32-unit
loads. The MAX13450E/MAX13451E have a 1/8-unit load
receiver input impedance, allowing up to 256 transceiv-
ers to be connected in parallel on one communication
line. Any combination of these devices, as well as other
RS-485 transceivers with a total of 32-unit loads or fewer,
can be connected to the line.
Reduced EMI and Reflections
The MAX13450E/MAX13451E feature reduced slew-rate
drivers that minimize EMI and reduce reflections caused
by improperly terminated cables, allowing error-free data
transmission up to 500kbps.
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參數(shù)描述 |
|---|---|
| MAX13451EAUD+ | 功能描述:RS-485接口IC Full-Dplx RS485 20Msps 5V LD/Rc 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 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
| MAX13451EAUD+T | 功能描述:RS-485接口IC Full-Dplx RS485 20Msps 5V LD/Rc 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 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
| MAX1346BETX | 功能描述:ADC / DAC多通道 RoHS:否 制造商:Texas Instruments 轉(zhuǎn)換速率: 分辨率:8 bit 接口類型:SPI 電壓參考: 電源電壓-最大:3.6 V 電源電壓-最小:2 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-40 |
| MAX1346BETX+ | 功能描述:ADC / DAC多通道 12-Bit 4Ch 300ksps 5.25 Precision ADC RoHS:否 制造商:Texas Instruments 轉(zhuǎn)換速率: 分辨率:8 bit 接口類型:SPI 電壓參考: 電源電壓-最大:3.6 V 電源電壓-最小:2 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-40 |
| MAX1346BETX+T | 功能描述:ADC / DAC多通道 12-Bit 4Ch 300ksps 5.25 Precision ADC RoHS:否 制造商:Texas Instruments 轉(zhuǎn)換速率: 分辨率:8 bit 接口類型:SPI 電壓參考: 電源電壓-最大:3.6 V 電源電壓-最小:2 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-40 |
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