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參數(shù)資料
| 型號： | ISL3333IRZ-T |
| 廠商： | INTERSIL CORP |
| 元件分類： | Buffer和線驅(qū)動 |
| 英文描述： | 3.3V, ±15kV ESD Protected, Two Port, Dual Protocol (RS-232/RS-485) Transceivers; Temperature Range: -40°C to 85°C; Package: 40-QFN T&R |
| 中文描述： | DUAL LINE TRANSCEIVER, PQCC40 |
| 封裝： | 6 X 6 MM, ROHS COMPLIANT, PLASTIC, QFN-40 |
| 文件頁數(shù)： | 6/26頁 |
| 文件大?。?/td> | 946K |
| 代理商： | ISL3333IRZ-T |
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14
FN6362.0
May 27, 2008
Typical Application
RS-232 to RS-485 Converter
The ISL3332, ISL3333 are ideal for implementing a single IC
2-wire (Tx Data, Rx Data) protocol converter, because each
port can be programmed for a different protocol. Figure 8
illustrates the simple connections to create a single
transceiver RS-232 to RS-485 converter. Depending on the
RS-232 data rate, using an RS-422 bus as an RS-232
“extension cord” can extend the transmission distance up to
4000’ (1220m). A similar circuit on the other end of the cable
completes the conversion to/from RS-232.
Detailed Description
Each of the two ISL333X ports supports dual protocols:
RS-485/422, 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 signaling, coupled with
RS-485’s requirement for an 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-485/422
maximum distance of 4000’ (1220m). It is important to note
that the ISL333X don’t follow the RS-485 convention
whereby the inverting I/O is labeled “B/Z”, and the non
inverting I/O is “A/Y”. Thus, in the application diagrams
below the 333X 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 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.
26
VCC
Y1
Z1
DY1
DZ1
0.1F
+
0.1F
+
0.1F
22
23
6
7
1
2
3
15
V+
V-
C1+
C1-
C2+
C2-
+
0.1F
28
27
RA1
A1
4
5k
Ω
RB1
B1
525
5k
Ω
C1
C2
+C3
C4
GND
+3.3V
+ 0.1F
14
SEL1
ON/OFF
8
20
VCC
24
R
D
NOTE: PINOUT FOR SSOP
Y2
Z2
DY2 19
11
10
DE2 18
VCC
D
RA2
A2
13
B2
12
17
R
SEL2
9
VCC
RS-232 IN
RS-232 OUT
RS-485 IN
RS-485 OUT
NC
FIGURE 8. SINGLE IC RS-232 TO RS-485 CONVERTER
TxD
RxD
FIGURE 9. TYPICAL HALF DUPLEX RS-485 NETWORK
0.1F
+
D
R
VCC
GND
RA
RXEN *
DE
DY
Y
Z
+3.3V
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
ISL333X
GENERIC 1/2 DUPLEX 485 XCVR
Tx/Rx
* QFN ONLY
A
B
ISL3332, ISL3333
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| ISL3333IRZ-T7A | 功能描述:IC TXRX RS232/485 DL 2PRT 40QFN RoHS:是 類別:集成電路 (IC) >> 接口 - 驅(qū)動器，接收器，收發(fā)器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:- 類型:發(fā)射器 驅(qū)動器/接收器數(shù):4/0 規(guī)程:RS422，RS485 電源電壓:4.75 V ~ 5.25 V 安裝類型:表面貼裝 封裝/外殼:16-SOIC（0.154"，3.90mm 寬） 供應(yīng)商設(shè)備封裝:16-SOIC 包裝:帶卷 (TR) |
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| ISL34340 | 制造商:Intersil Corporation 功能描述: |
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