參數(shù)資料
型號(hào)： SP503EF
英文描述： Multiprotocol Transceiver
中文描述： 多協(xié)議收發(fā)器
文件頁數(shù)： 12/29頁
文件大小： 641K
代理商： SP503EF
Date: 7/29/04
SP503 Multiprotocol Transceiver
12
Copyright 2004 Sipex Corporation
There are three basic types of receivers —
RS-232, RS-423, and RS-485. The RS-232
receiver is a single–ended input with a threshold
of 0.8V to 2.4V. The RS-232 receiver has an
operating voltage range of
±
15V and can re-
ceive signals up to 120kbps. RS-232 receivers
are used in RS-232 mode for all signal types, and
in V.35 mode for control line signals.
The RS-423 receivers are also single–ended but
have an input threshold as low as
±
200mV. The
input impedance is guaranteed to be greater than
4k
, with an operating voltage range of
±
7V.
The RS-423 receivers can operate up to 120kbps.
RS-423 receivers are used for the IC signal in
RS-449 and EIA-530 modes, as shown in
Table 2
.
The third type of receiver supports RS-485,
which is a differential interface mode. The
RS-485 receiver has an input impedance of
15k
and a differential threshold of
±
200mV.
Since the characteristics of an RS-422 receiver
are actually subsets of RS-485, the receivers for
RS-422 requirements are identical to the
RS-485 receivers. RS-422 receivers are used in
RS-449 and EIA-530 for receiving clock, data,
and some control line signals. The RS-485
receivers are also used for the V.35 mode. V.35
levels require the
±
0.55V signals with a load of
100
. In order to meet the V.35 input imped-
ance of 100
, the external termination network
of
Figure 6
must be applied. The threshold of the
V.35 receiver is
±
200mV. The V.35 receivers
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
SP503
has seven (7) independent receivers
which can be programmed for six (6) different
interface modes. One of the seven (7) receivers
(SCT) has an active–high enable control, as
shown in the Mode Diagrams.
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,
the electrical characteristics will change to sup-
port the requirements of clock, data, and control
line receivers.
Table 2
shows a summary of the
electrical characteristics of the receivers in the
different interface modes. Unused receiver in-
puts can be left floating without causing oscilla-
tion. To ensure a desired state of the receiver
output, a pull–up resistor of 100k
to +5V
should be connected to the inverting input for a
logic low, or the non–inverting input for a logic
high. For single-ended receivers, a pull–down
resistor to ground of 5k
is internally con-
nected, which will ensure a logic high output.
Table 2. SP503 Receivers
相關(guān)PDF資料
PDF描述
SP503EM Multiprotocol Transceiver
SP504 WAN Multi-Mode Serial Transceiver
SP504AN Application Note
SP504CF Application Note
SP504EB Evaluation Board Manual
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
SP503EF-L 制造商:Exar Corporation 功能描述:IC TRANSCEIVER MULTI MODE MQFP80 制造商:Exar Corporation 功能描述:IC, TRANSCEIVER, MULTI MODE, MQFP80
SP503EM 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:Multiprotocol Transceiver
SP503EM-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
SP503P 制造商:SII 制造商全稱:Seiko Instruments Inc 功能描述:LIQUID CRYSTAL DISPLAYS(STANDARD PRODUCTS)
SP504 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:WAN Multi-Mode Serial Transceiver
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