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SP301 数据表(PDF) 5 Page - Sipex Corporation

部件名 SP301
功能描述  RS-232/RS-422 Line Drivers/Receivers
Download  18 Pages
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制造商  SIPEX [Sipex Corporation]
网页  http://www.sipex.com
标志 SIPEX - Sipex Corporation

SP301 数据表(HTML) 5 Page - Sipex Corporation

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Corporation
SIGNAL PROCESSING EXCELLENCE
Figure 1. Isolating SP301/302 From Ground;
a) Single SP301/302; b) Multiple SP301/302
VDD
GND
VCC
VEE
2N2222
VEE
3.3kΩ
3.3kΩ
VDD
GND
VCC
VEE
Q3
Q4
SP301/302
SP301/302
VCC
VDD
Figure 2. Typical Circuit
SOIC packages for operation over the commercial
temperature range.
VDD
GND
VCC
VEE
2N2222
VEE
VDD
3.3kΩ
3.3kΩ
Q3
Q4
SP301/302
VCC
a)
b)
circuitry. If the potential exists for momentary
shorts to voltages greater than
±20V, it is recom-
mended that a 220
Ω 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 inter-
nally 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 SP301/302 transmitter output occupies a
data transmission line with other RS-232 de-
vices 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
Ω. This can
be easily achieved as shown in Figure 1a, where
an external transistor is used as a switch to
USING THE SP301/302
POWER SUPPLIES
The SP301/SP302 require
±12V and +5V for
full RS-232 and RS-422 operation. The
±12V
supplies set up the RS-232
±9V voltage swings,
and the +5V is used for the internal logic that
formats the communications mode and controls
the loopback function. The supply voltages can
be decreased to as low as
±7V for V
DD and VEE,
and 4.0V for V
CC. Under these supply condi-
tions, derated performance can be expected.
POWER SUPPLY SEQUENCING
There are two requirements for power supply
sequencing for the SP301/302. The first is that
V
DD is always greater than VCC. The second is
that when the part is powered up, V
DD must be
applied 20ms before V
CC.
GENERAL USAGE
RS232 Operation
The SP301 and SP302 are fully compliant
RS-232 devices. Their outputs are fully pro-
tected against shorts to
±20V with no external
RIB1
ROB1
TOB1
TIB1
RIA1
ROA1
TOA1
TIA1
SELECT A = 1
SELECT B = 0
LOOPBACK = 1
TOA2
RIA2
TOB2
TIB2
RIB2
ROB2
VDD
GND
VCC
VEE
2N2222
VCC
3.3kΩ
3.3kΩ
Q3
Q4
SP302
VEE
VDD


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