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參數(shù)資料
| 型號： | SP331 |
| 元件分類： | RS-232 |
| 英文描述： | 5V High-Speed RS-232 Transceivers with 0.1uF Capacitors |
| 中文描述： | 5V的高速RS - 232收發(fā)器與0.1uF電容 |
| 文件頁數(shù)： | 10/13頁 |
| 文件大?。?/td> | 169K |
| 代理商： | SP331 |
SP331DS/13
SP331 RS-232/RS-485 Serial Transceiver
10
Copyright 2000 Sipex Corporation
Drivers
The
SP331
has four independent RS-232 single-
ended drivers and two differential RS-485 driv-
ers. Control for the mode selection is done via
a four–bit control word. The drivers are pre-
arranged such that for each mode of operation
the relative position and functionality of the
drivers are set up to accommodate the selected
interface mode. As the mode of the drivers is
changed, the electrical characteristics will change
to support the requirements of clock, data, and
control line signal levels. Unused driver inputs
can be left floating; however, to ensure a desired
state with no input signal, pull–up resistors to
+5V or pull–down resistors to ground are sug-
gested. Since the driver inputs are both TTL or
CMOS compatible, any value resistor less than
100k
will suffice.
When in RS-232 mode, the single-ended RS-
232 drivers produce compliant RS-232E and
ITU V.28 signals. Each of the four drivers
output single-ended bipolar signals in access of
±
5V with a full load of 3k
and 2500pF applied
as specified. These drivers can also operate at
least 120kbps.
When programmed to RS-485 mode, the differ-
ential RS-485 drivers produce complaint RS-
485 signals. Each RS-485 driver outputs a uni-
polar signal on each output pin with a magnitude
of at least 1.5V while loaded with a worst case
of 54
between the driver's two output pins.
The signal levels and drive capability of the RS-
485 drivers allow the drivers to also comply
with RS-422 levels. The transmission rate for
the differential drivers is 10Mbps.
Receivers
The
SP331
has four single-ended receivers when
programmed for RS-232 mode and two differ-
ential receivers when programmed for RS-485
mode.
Control for the mode selection is done via a 4–
bit control word, as in the drivers. As the oper-
ating mode of the receivers is changed, the
electrical characteristics will change to support
the requirements of the appropriate serial stan-
dard. Unused receiver inputs can be left floating
without causing oscillation. To ensure a desired
state of the receiver output, a pull–up resistor of
100k
to +5V should be connected to the in-
verting input for a logic low, or the non–invert-
ing input for a logic high. For single-ended
receivers, a pull–down resistor to ground of 5k
is internally connected, which will ensure a
logic high output.
The RS-232 receiver has 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 receive signals up to 120kbps. RS-232
receivers are used in RS-232 mode for all signal
types include data, clock, and control lines of
the RS-232 serial port.
The differential 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. All of the differential
receivers can receive data up to 10Mbps.
Select Mode Pins
Similar to our SP500 family of multiprotocol
products, the
SP331
has the ability to change the
configuration of the drivers and receivers via a
4–bit switch. Referring to
Table 1
; RS-232
mode, RS-485 mode, or two different combina-
tions of RS-232/RS-485 can be configured us-
ing the SEL_A and SEL_B pins. The drivers
can be put into tri-state mode by using the
SEL_C and SEL_D pins. All receivers remain
active during any tri-state condition of the driv-
ers.
Loopback Mode
Loopback is invoked by asserting "xx11" into
the select pins. In RS-232/RS-485 or RS-485/
RS-232 loopback mode, the RS-232 driver out-
puts loop back into the RS-232 receiver inputs
and the RS-485 differential driver loops back
into the RS-485 receiver. During loopback, the
driver outputs and receiver inputs are discon-
nected from the outside world. The driver
outputs are in tri-state and the receiver inputs are
disabled. The input impedance of the receivers
during loopback is approximately 15k
to
ground.
相關PDF資料 |
PDF描述 |
|---|---|
| SP331CT | 5V High-Speed RS-232 Transceivers with 0.1uF Capacitors |
| SP331ET | 5V High-Speed RS-232 Transceivers with 0.1uF Capacitors |
| SP332 | 5V High-Speed RS-232 Transceivers with 0.1uF Capacitors |
| SP332CT | 5V High-Speed RS-232 Transceivers with 0.1uF Capacitors |
| SP332ET | 5V High-Speed RS-232 Transceivers with 0.1uF Capacitors |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| SP3-3-10 | 制造商:RHOMBUS-IND 制造商全稱:Rhombus Industries Inc. 功能描述:SP3 Series Mini-SIP Passive Delay Modules |
| SP331CT | 制造商:Rochester Electronics LLC 功能描述: 制造商:Exar Corporation 功能描述: |
| SP331CT/TR | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:Programmable Dual RS-232/RS-485 Transceiver |
| SP331CT-L | 功能描述:RS-232接口集成電路 RS232/422/RS485 Transceiver Multi RoHS:否 制造商:Exar 數(shù)據(jù)速率:52 Mbps 工作電源電壓:5 V 電源電流:300 mA 工作溫度范圍:- 40 C to + 85 C 安裝風格:SMD/SMT 封裝 / 箱體:LQFP-100 封裝: |
| SP331CT-L/TR | 功能描述:RS-232接口集成電路 Programmable RS-232/RS-485 RoHS:否 制造商:Exar 數(shù)據(jù)速率:52 Mbps 工作電源電壓:5 V 電源電流:300 mA 工作溫度范圍:- 40 C to + 85 C 安裝風格:SMD/SMT 封裝 / 箱體:LQFP-100 封裝: |
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