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參數(shù)資料
| 型號： | SP334ET |
| 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)： | 10/12頁 |
| 文件大?。?/td> | 155K |
| 代理商： | SP334ET |
SP334DS/10
Programmable RS-232/RS-485 Transceiver
10
Copyright 2000 Sipex Corporation
outputs. The drivers can only be tri-stated in
RS-485 mode. The drivers are always active in
RS-232 mode.
The receiver outputs can also be tri-stated by
use of the RXEN pin. A logic LOW will enable
the receiver outputs and a logic HIGH will
tri-state the outputs. The receiver tri-state
capability is offered for both RS-232 and
RS-485 modes. The input impedance if the
receivers during tri-state is at least 12k
.
Applications
The
SP334
allows the user flexibility in having
a RS-232 or RS-485 serial port without using
two different discrete active ICs.
Figure 18
shows a connection to a standard DB-9 RS-232
connector. In RS-485 mode, the
SP334
is a full
duplex transceiver, however, a half duplex
configuration can be made by connecting the
driver outputs to the receiver inputs.
25
12
11
14
+5V
GND
CTS
TxD
RTS
0.1
μ
F
0.1
μ
F
VCC
V+
V–
DTR
RxD
T1
T2
T3
R1
TX1
TX2
TX3
RI1
TI1
TI2
TI3
RX1
RX5
RX4
RX3
RX2
RI5
RI4
RI3
RI2
19
15
4
5
6
7
8
10
0.1
μ
F
0.1
μ
F
C1+
C1-
C2+
C2-
9
13
23
22
21
20
16
RS232/RS485
27
28
1
400K
Vcc
400K
Vcc
400K
Vcc
0V
DSR
DCD
RI
17
18
24
5K
5K
5K
5K
SP334
R2
R3
5K
R4
R5
RXEN
26
1
9
5
6
TxD
CTS
DTR
RI
SG
RTS
RxD
DSR
DCD
Figure 18. SP334 Configuration to a DB-9 Serial Port
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 RS485, the
receivers for RS-422 requirements are identical
to the RS-485 receivers. All of the differential
receivers can receive data up to 10Mbps.
Enable Pins
The
SP334
drivers can be enabled by use of the
TXEN pin. A logic HIGH will enable the driver
outputs and a logic LOW will tri-state the
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| SP334ET-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: |
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