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| 型号： | MAX13083EESD+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 7/24页 |
| 文件大小： | 0K |
| 描述： | IC TXRX RS485/422 14-SOIC |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 50 |
| 类型： | 收发器 |
| 驱动器/接收器数： | 1/1 |
| 规程： | RS422，RS485 |
| 电源电压： | 4.5 V ~ 5.5 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 14-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 14-SOIC |
| 包装： | 管件 |
| 产品目录页面： | 1408 (CN2011-ZH PDF) |
Detailed Description
The MAX13080E–MAX13089E high-speed transceivers
for RS-485/RS-422 communication contain one driver
and one receiver. These devices feature fail-safe circuit-
ry, which guarantees a logic-high receiver output when
the receiver inputs are open or shorted, or when they
are connected to a terminated transmission line with all
drivers disabled (see the
Fail-Safe section). The
MAX13080E/MAX13082E/MAX13083E/MAX13086E/
MAX13088E/MAX13089E also feature a hot-swap capa-
bility allowing line insertion without erroneous data trans-
fer (see the
Hot Swap Capability section). The
MAX13080E/MAX13081E/MAX13082E feature reduced
slew-rate drivers that minimize EMI and reduce reflec-
tions caused by improperly terminated cables, allowing
error-free data transmission up to 250kbps. The
MAX13083E/MAX13084E also offer slew-rate limits
allowing transmit speeds up to 500kbps. The
MAX13086E/MAX13087E/MAX13088Es’ driver slew
rates are not limited, making transmit speeds up to
16Mbps possible. The MAX13089E’s slew rate is selec-
table between 250kbps, 500kbps, and 16Mbps by dri-
ving a selector pin with a three-state driver.
The MAX13082E/MAX13088E are half-duplex transceivers,
while the MAX13080E/MAX13081E/ MAX13083E/
MAX13084E/MAX13086E/MAX13087E are full-duplex
transceivers. The MAX13089E is selectable between
half- and full-duplex communication by driving a selec-
tor pin (H/
F) high or low, respectively.
All devices operate from a single +5.0V supply. Drivers
are output short-circuit current limited. Thermal-shutdown
circuitry protects drivers against excessive power dissi-
pation. When activated, the thermal-shutdown circuitry
places the driver outputs into a high-impedance state.
Receiver Input Filtering
The receivers of the MAX13080E–MAX13084E, and the
MAX13089E when operating in 250kbps or 500kbps
mode, incorporate input filtering in addition to input
hysteresis. This filtering enhances noise immunity with
differential signals that have very slow rise and fall
times. Receiver propagation delay increases by 25%
due to this filtering.
Fail-Safe
The MAX13080E family guarantees 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 differential 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 receiv-
er’s differential input voltage is pulled to 0V by the termi-
nation. With the receiver thresholds of the MAX13080E
family, this results in a logic-high with a 50mV minimum
noise margin. Unlike previous fail-safe devices, the
-50mV to -200mV threshold complies with the ±200mV
EIA/TIA-485 standard.
Hot-Swap Capability (Except
MAX13081E/MAX13084E/MAX13087E)
Hot-Swap Inputs
When circuit boards are inserted into a hot or powered
backplane, differential disturbances to the data bus
can lead to data errors. Upon initial circuit board inser-
tion, the data communication processor undergoes its
own power-up sequence. During this period, the
processor’s logic-output drivers are high impedance
and are unable to drive the DE and
RE inputs of these
devices to a defined logic level. Leakage currents up to
±10A from the high-impedance state of the proces-
sor’s logic drivers could cause standard CMOS enable
inputs of a transceiver to drift to an incorrect logic level.
Additionally, parasitic circuit board capacitance could
cause coupling of VCC or GND to the enable inputs.
Without the hot-swap capability, these factors could
improperly enable the transceiver’s driver or receiver.
When VCC rises, an internal pulldown circuit holds DE
low and
RE high. After the initial power-up sequence,
the pulldown circuit becomes transparent, resetting the
hot-swap tolerable input.
Hot-Swap Input Circuitry
The enable inputs feature hot-swap capability. At the
input there are two NMOS devices, M1 and M2
(Figure 9). When VCC ramps from zero, an internal 7s
timer turns on M2 and sets the SR latch, which also
turns on M1. Transistors M2, a 500A current sink, and
M1, a 100A current sink, pull DE to GND through a
5k
Ω resistor. M2 is designed to pull DE to the disabled
state against an external parasitic capacitance up to
100pF that can drive DE high. After 7s, the timer
deactivates M2 while M1 remains on, holding DE low
against three-state leakages that can drive DE high. M1
remains on until an external source overcomes the
required input current. At this time, the SR latch resets
and M1 turns off. When M1 turns off, DE reverts to a
standard, high-impedance CMOS input. Whenever VCC
drops below 1V, the hot-swap input is reset.
For
RE there is a complementary circuit employing two
PMOS devices pulling
RE to VCC.
+5.0V, ±15kV ESD-Protected, Fail-Safe,
Hot-Swap, RS-485/RS-422 Transceivers
Maxim Integrated
15
MAX13080E–MAX13084E/
MAX13086E–MAX13089E
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX13083EESD+ | 功能描述:RS-422/RS-485 接口 IC Full Duplex 500Kbps 5V RS-422/485 LD/Rcv RoHS:否 制造商:Maxim Integrated 数据速率:1136 Kbps 工作电源电压:3 V to 5.5 V 电源电流:5.9 mA 工作温度范围:- 40 C to + 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-28 封装:Tube |
| MAX13083EESD+T | 功能描述:RS-422/RS-485 接口 IC Full Duplex 500Kbps 5V RS-422/485 LD/Rcv RoHS:否 制造商:Maxim Integrated 数据速率:1136 Kbps 工作电源电压:3 V to 5.5 V 电源电流:5.9 mA 工作温度范围:- 40 C to + 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-28 封装:Tube |
| MAX13083EESD-T | 功能描述:RS-422/RS-485 接口 IC RoHS:否 制造商:Maxim Integrated 数据速率:1136 Kbps 工作电源电压:3 V to 5.5 V 电源电流:5.9 mA 工作温度范围:- 40 C to + 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-28 封装:Tube |
| MAX13084EAPA | 功能描述:RS-422/RS-485 接口 IC RoHS:否 制造商:Maxim Integrated 数据速率:1136 Kbps 工作电源电压:3 V to 5.5 V 电源电流:5.9 mA 工作温度范围:- 40 C to + 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-28 封装:Tube |
| MAX13084EASA | 功能描述:RS-422/RS-485 接口 IC RoHS:否 制造商:Maxim Integrated 数据速率:1136 Kbps 工作电源电压:3 V to 5.5 V 电源电流:5.9 mA 工作温度范围:- 40 C to + 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-28 封装:Tube |
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