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參數(shù)資料
| 型號(hào)： | SP304CS |
| 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)： | 5/12頁 |
| 文件大?。?/td> | 143K |
| 代理商： | SP304CS |
81
Corporation
SIGNAL PROCESSING EXCELLENCE
RIB
1
ROB
1
TOB
1
TIB
1
RIA
1
ROA
1
TOA
1
TIA
1
SELECT A = 1
SELECT B = 0
LOOPBACK = 1
TOA
2
RIA
2
TOB
2
TIB
2
RIB
2
ROB
2
V
DD
GND
V
CC
V
EE
2N2222
V
CC
3.3K‰
3.3K‰
Q
3
Q
4
SP304
V
EE
V
DD
Figure 2. Typical Circuit
transmission line with other RS-232 devices
which are not powered by the same power
supplies, it is possible that a device that is not
powered will have a low impedance path to
ground at its driver output. The RS-232 stan-
dards require that with no power applied to the
device, the impedance from a transmitter output
to ground must be greater than 300
. This can
be easily achieved as shown in
Figure 1a
, where
an external transistor is used as a switch to
isolate an
SP304
from ground in the power off
condition. With V
turned on, the transistor
switch is on, connecting ground (GND) for the
device to the circuit ground. In a power-off
condition, this transistor is switched off, thus
isolating the unit from circuit ground, and thereby
leaving the driver in a high impedance state.
Multiple
SP304s
can be connected as shown in
Figure 1b
.
RS-422 OPERATION
The
SP304
is a fully compliant RS-422 device
when operating in the RS-422 mode. Baud rate
and drive capability have been balanced to pro-
vide as much versatility as possible. The
SP304
is both guaranteed for a 1Mbps data rate,
V
DD
GND
V
CC
V
EE
2N2222
V
EE
V
DD
3.3k‰
3.3k‰
Q
3
Q
4
SP304
V
CC
V
DD
GND
V
CC
V
EE
2N2222
V
EE
3.3k‰
3.3k‰
V
DD
GND
V
CC
V
EE
Q
3
Q
4
SP304
SP304
V
CC
V
DD
Figure 1. Isolating the SP304 from Ground.
a) Single SP304
b) Multiple SP304
+4.0V for V
. Under these supply conditions,
derated performance can be expected.
POWER SUPPLY SEQUENCING
There are no special power–up sequencing re-
quirements for the
SP304
.
GENERAL USAGE
RS-232 Operation
The
SP304
is a fully compliant RS-232 device.
Its outputs are fully protected against shorts to
±
20V with no external circuitry. If the potential
exists for momentary shorts to voltages greater
than
±
20V, it is recommended that a 220
resistor be wired in series with each driver
output. This will limit any damage from the
higher short-circuit current from these higher
voltage potentials. Voltage clamps such as back-
to-back Zener diodes can be used to clamp the
driver outputs to “safe” levels. Short circuit
current to ground is internally limited, and can
therefore be sustained infinitely. Under normal
operating conditions, the drivers can typically
source 7mA at
±
5V output, which exceeds the
minimum RS-232 standards requirement.
If an
SP304
transmitter output occupies a data
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| SP304CT | 5V High-Speed RS-232 Transceivers with 0.1uF Capacitors |
| SP304ES | 5V High-Speed RS-232 Transceivers with 0.1uF Capacitors |
| SP304ET | 5V High-Speed RS-232 Transceivers with 0.1uF Capacitors |
| SP3075EEN | 15kV ESD-Protected, 3.3V, 1/8 Load, Failsafe RS-485/RS422 Transceivers |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SP304CT | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:RS-232/RS-422 Line Drivers/Receivers |
| SP304ES | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:RS-232/RS-422 Line Drivers/Receivers |
| SP304ET | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:RS-232/RS-422 Line Drivers/Receivers |
| SP3050 | 制造商:LITTELFUSE 制造商全稱:Littelfuse 功能描述:Low Capacitance Diode Array for ESD and Surge Protection |
| SP3050_11 | 制造商:LITTELFUSE 制造商全稱:Littelfuse 功能描述:TVS Diode Arrays |
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