参数资料
型号: ISL41334IRZ-T
厂商: Intersil
文件页数: 6/28页
文件大小: 0K
描述: TRANSISTOR ESD SGL/DUAL 40-QFN
产品培训模块: Solutions for Industrial Control Applications
标准包装: 1
类型: 收发器
驱动器/接收器数: 2/2
规程: RS232,RS422,RS485
电源电压: 4.5 V ~ 5.5 V
安装类型: 表面贴装
封装/外壳: 40-VFQFN 裸露焊盘
供应商设备封装: 40-QFN 裸露焊盘(6x6)
包装: 标准包装
产品目录页面: 1241 (CN2011-ZH PDF)
其它名称: ISL41334IRZ-TDKR
14
FN6202.3
November 21, 2007
RS-422 is typically a point-to-point (one driver talking to one
receiver on a bus), or a point-to-multipoint (multidrop)
standard that allows only one driver and up to 10 receivers
on each bus. Because of the one driver per bus limitation,
RS-422 networks use a two bus, full duplex structure for
bidirectional communication, and the Rx inputs and Tx
outputs (no tri-state required) connect to different busses, as
shown in Figure 10.
Conversely, RS-485 is a true multipoint standard, which
allows up to 32 devices (any combination of drivers- must be
tri-statable - and receivers) on each bus. Now bidirectional
communication takes place on a single bus, so the Rx inputs
and Tx outputs of a port connect to the same bus lines, as
shown in Figure 9. Each port set to RS-485 /422 mode
includes one Rx and one Tx.
RS-232 is a point-to-point, singled ended (signal voltages
referenced to GND) communication protocol targeting fairly
short (<150’, 46m) and low data rate (<1Mbps) applications.
Each port contains two transceivers (2 Tx and 2 Rx) in
RS-232 mode.
Protocol selection is handled via a logic pin (SELX) for each
port.
.
ISL81334, ISL41334 Advantages
These dual protocol ICs offer many parametric
improvements versus those offered on competing dual
protocol devices. Some of the major improvements are:
15kV Bus Pin ESD - Eases board level requirements
2.7V Diff VOUT - Better Noise immunity and/or distance
Full Failsafe RS-485 Rx - Eliminates bus biasing
Selectable RS-485 Data Rate - Up to 20Mbps, or slewrate
limited for low EMI and fewer termination issues
High RS-232 Data Rate - >460kbps
Lower Tx and Rx Skews - Wider, consistent bit widths
Lower ICC - Max ICC is 2x to 4x lower than competition
Flow-Thru Pinouts - Tx, Rx bus pins on one side/logic pins
on the other, for easy routing to connector/UART
Smaller (SSOP and QFN) and Pb-free Packaging.
FIGURE 9. TYPICAL HALF DUPLEX RS-485 NETWORK
FIGURE 10. TYPICAL RS-422 NETWORK
0.1
μF
+
D
R
VCC
GND
RA
RXEN *
DE
DY
Y
Z
+5V
RT
0.1
μF
+
D
R
VCC
GND
RO
RE
DE
DI
A/Y
B/Z
+5V
0.1
μF
+
D
VCC
GND
RO
RE
DE
DI
A/Y
B/Z
+5V
R
RT
ISL81334, ISL41334
GENERIC 1/2 DUPLEX 485 XCVR
Tx/Rx
* QFN ONLY
A
B
0.1
μF
+
D
R
VCC
GND
RA
DE
DY
B
A
+5V
0.1
μF
+
D
R
VCC
GND
RO
DI
A
Z
+5V
0.1
μF
+
VCC
GND
RO
RE
+5V
R
RT
ISL81334, ISL41334 (MASTER)
GENERIC 422 Rx (SLAVE)
GENERIC FULL DUPLEX 422 XCVR (SLAVE)
A
B
RT
Y
Z
Y
B
1k
Ω
OR NC
ISL81334, ISL41334
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