參數(shù)資料
型號(hào)： SP502CM
英文描述： Multi-Mode Serial Transceiver
中文描述： 多模式串行收發(fā)器
文件頁(yè)數(shù)： 12/32頁(yè)
文件大?。?/td> 345K
代理商： SP502CM
Rev. 7/21/03
SP502 Multi-Mode Serial Transceiver
12
Copyright 2003 Sipex Corporation
Pin Label
Mode:
RS-232
V.35
RS-422
RS-485
RS-449
EIA-530
RDEC
3
–RDEC
0
RD(a)
0000
0010
1110
0100
0101
1100
1101
Undefined
RS-232
V.35–
RS-422–
RS-485–
RS-422–
RS-422–
RD(b)
Undefined
15k
to GND
V.35+
RS-422+
RS-485+
RS-422+
RS-422+
RT(a)
Undefined
RS-232
V.35–
RS-422–
RS-485–
RS-422–
RS-422–
RT(b)
Undefined
15k
to GND
V.35+
RS-422+
RS-485+
RS-422+
RS-422+
CS(a)
Undefined
RS-232
RS-232
RS-422–
RS-485–
RS-422–
RS-422–
CS(b)
Undefined
15k
to GND
15k
to GND
RS-422+
RS-485+
RS-422+
RS-422+
DM(a)
Undefined
RS-232
RS-232
RS-422–
RS-485–
RS-422–
RS-422–
DM(b)
Undefined
15k
to GND
15k
to GND
RS-422+
RS-485+
RS-422+
RS-422+
RR(a)
Undefined
RS-232
RS-232
RS-422–
RS-485–
RS-422–
RS-422–
RR(b)
Undefined
15k
to GND
15k
to GND
RS-422+
RS-485+
RS-422+
RS-422+
IC(a)
Undefined
RS-232
RS-232
RS-422–
RS-485–
RS-423
RS-423
IC(b)
Undefined
15k
to GND
15k
to GND
RS-422+
RS-485+
15k
to GND
15k
to GND
SCT(a)
Undefined
RS-232
V.35–
RS-422–
RS-485–
RS-422–
RS-422–
SCT(b)
Undefined
15k
to GND
V.35+
RS-422+
RS-485+
RS-422+
RS-422+
Receivers
The
SP502
is equipped with seven (7) receivers
which can be programmed in six (6) different
modes of operation. One of the seven (7) receiv-
ers (RxT) is part of a half-duplex channel, which
means its inputs are shared with a driver
output, as shown in the Mode Diagrams. The
RxT receiver has its inputs internally connected
to the TT(a) and TT(b) pins. The select pin
labeled ST/TT enables either the TT-driver or
the ST-driver, but it does not disable the re-
ceiver. The RxT receiver is always connected to
the TT(a) and TT(b) pins. Any signal that is
received or transmitted on TT(a) and TT(b) will
trigger a TTL-output at the RxT pin.
Control for the mode selection is done via a 4–
bit control word that is independent from the
driver control word. The coding for the drivers
and receivers is identical. Therefore, if the modes
for the drivers and receivers are supposed to be
identical in the application, the control lines can
be tied together.
Like the drivers, the receivers are pre-arranged
for the specific requirements of the interface. As
the operating mode of the receivers is changed,
Table 2. SP502 Receivers
can operate up to 120kbps. The RS-232 drivers
are used in RS-232 mode for all signals, and also
in V.35 mode where they are used as the control
line signals.
The RS-423 drivers output a minimum of
±
3.6V
level single–ended signals (with 450
loading)
and can operate up to 120kbps. Open circuit
V
and V
measurements may exceed the
±
6V limitation of RS-423. The RS-423 drivers
are used in RS-449 and EIA-530 modes as RL
and LL outputs.
The third type of driver supports RS-485, which
is a differential signal that can maintain
±
1.5V
differential output levels with a worst case load
of 54
. The signal levels and drive capability of
the RS-485 drivers allow the drivers to also
support RS-422 requirements of
±
2V differen-
tial output levels with 100
loads. The RS-422
drivers are used in RS-449 and EIA-530 modes
as clock, data, and some control line signals.
The RS-485–type drivers are also used in the
V.35 mode. V.35 levels require
±
0.55V signals
with a load of 100
. In order to meet the voltage
requirements of V.35, external series resistors
with source impedance termination resistors
must be implemented to voltage divide the driver
outputs from 0 to +5V to 0 to +0.55V.
Figure 6
shows the values of the resistor network and
how to connect them. The termination network
also achieves the 50
to 150
source imped-
ance for V.35. For applications that require
V.11 signals for clock and data instead of V.35
levels, omit the external termination networks.
All of the differential drivers, RS-485, RS-422,
and V.35 can operate up to 5Mbps.
*TT(a) and TT(b) can be programmed as driver outputs or receiver inputs.
相關(guān)PDF資料
PDF描述
SP503 Multiprotocol Transceiver
SP503AN Application Note
SP503CF Multiprotocol Transceiver
SP503EB Application Note
SP503EF Multiprotocol Transceiver
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
SP503 制造商:EXAR 制造商全稱:EXAR 功能描述:Multiprotocol Transceiver
SP503AN 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:Application Note
SP503CF 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:Application Note
SP503CM-L 功能描述:總線收發(fā)器 Full Duplex RS-485 s RoHS:否 制造商:Fairchild Semiconductor 邏輯類型:CMOS 邏輯系列:74VCX 每芯片的通道數(shù)量:16 輸入電平:CMOS 輸出電平:CMOS 輸出類型:3-State 高電平輸出電流:- 24 mA 低電平輸出電流:24 mA 傳播延遲時(shí)間:6.2 ns 電源電壓-最大:2.7 V, 3.6 V 電源電壓-最小:1.65 V, 2.3 V 最大工作溫度:+ 85 C 封裝 / 箱體:TSSOP-48 封裝:Reel
SP503EB 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:Application Note
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