參數(shù)資料
型號(hào)： ISL41387IRZ-T
廠商： Intersil
文件頁數(shù)： 5/27頁
文件大?。?/td> 0K
描述： IC TXRX DUAL PROTOCAL ESD 40-QFN
產(chǎn)品培訓(xùn)模塊： Solutions for Industrial Control Applications
標(biāo)準(zhǔn)包裝： 1
類型： 收發(fā)器
驅(qū)動(dòng)器/接收器數(shù)： 2/2
規(guī)程： RS232，RS422，RS485
電源電壓： 4.5 V ~ 5.5 V
安裝類型： 表面貼裝
封裝/外殼： 40-VFQFN 裸露焊盤
供應(yīng)商設(shè)備封裝： 40-QFN 裸露焊盤（6x6）
包裝： 標(biāo)準(zhǔn)包裝
其它名稱： ISL41387IRZ-TDKR
13
FN6201.3
November 21, 2007
Detailed Description
The ISL81387, ISL41387 port supports dual protocols:
RS-485, RS-422, and RS-232. RS-485 and RS-422 are
differential (balanced) data transmission standards for use in
high speed (up to 20Mbps) networks, or long haul and noisy
environments. The differential signalling, coupled with
RS-485’s requirement for extended common mode range
(CMR) of +12V to -7V make these transceivers extremely
tolerant of ground potential differences, as well as voltages
induced in the cable by external fields. Both of these effects
are real concerns when communicating over the RS-485,
RS-422 maximum distance of 4000’ (1220m). It is important
to note that the ISL81387, ISL41387 don’t follow the RS-485
convention whereby the inverting I/O is labelled “B/Z”, and
the non-inverting I/O is “A/Y”. Thus, in the following
application diagrams, the 1387 A/Y (B/Z) pins connect to the
B/Z (A/Y) pins of the generic RS-485, RS-422 ICs.
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 9. Tx and Rx enables aren’t required, so
connect RXEN and DEN to VCC through a 1kΩ resistor.
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 8. A port set to RS-485, RS-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.
A port contains two transceivers (2 Tx and 2 Rx) in RS-232
mode.
Protocol selection is handled via the 485/232 logic pin.
FIGURE 8. TYPICAL HALF DUPLEX RS-485 NETWORK
FIGURE 9. TYPICAL RS-422 NETWORK
0.1
μF
+
D
R
VCC
GND
RA
RXEN *
DEN
DY
Y
Z
+5V
RT
0.1F
+
D
R
VCC
GND
RO
RE
DE
DI
A/Y
B/Z
+5V
0.1F
+
D
VCC
GND
RO
RE
DE
DI
A/Y
B/Z
+5V
R
RT
ISL81387, ISL41387
GENERIC 1/2 DUPLEX 485 XCVR
Tx/Rx
*QFN ONLY,
CONNECT RXEN TO GND
A
B
0.1
μF
+
D
R
VCC
GND
RA
DEN
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
ISL81387 (MASTER)
GENERIC 422 Rx (SLAVE)
GENERIC FULL DUPLEX 422 XCVR (SLAVE)
A
B
RT
Y
Z
Y
B
1k
Ω
RXEN
ISL81387, ISL41387
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