SIPEX SP302CT

SP301/302
Corporation
SIGNAL PROCESSING EXCELLENCE
RS-232/RS-422 Line Drivers/Receivers
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RS-232 and RS-422 on One Chip
Multiple Drivers and Receivers
Software-selectable Modes
Loopback for Self-Testing
Short-circuit Protected
24-pin Single-width DIP or SOIC
Package
DESCRIPTION…
The SP301 and SP302 are proprietary single-chip devices that contain both RS-232 and RS-422
protocol line drivers and receivers. Their configuration may be changed at any time by logic levels
on two control lines. In any configuration, both the SP301 and SP302 fully meet the requirements
of the EIA RS-232D and RS-422 data communication standards. A loopback test mode is
provided.The SP301 and SP302 are available in 24-pin single width plastic, and 28-pin SOIC
packages for commercial and industrial temperature range operation.
TOB1
TOB2
TOA1 TOA2
RIB1
RIB2
RIA1 RIA2
VDD
VCC
VEE
GND SELECT
A
B
SP302
LOOP–
BACK
TIB1
Corporation
SIGNAL PROCESSING EXCELLENCE
TIB2
TIA1
ROB1
ROB2
ROA1
51
SPECIFICATIONS
(TMIN ≤ TA ≤ TMAX and nominal supply voltages unless otherwise noted)
PARAMETER
RS-232 DRIVER
TTL Input Level
VIL
VIH
High Level Output
Low Level Output
Short Circuit Current
Loopback Output Voltage
Slew rate
Transition Time
Maximum Transmission Rate
RS-232 RECEIVER
Input Voltage Range
Input High Threshold
Input Low Threshold
Input Impedance
TTL Output Level
VOL
VOH
Maximum Receiving Rate
RS-422 DRIVER
TTL Input Level
V
V
High Level Output
Low Level Output
Differential Output
IL
IH
MIN.
TYP.
0
2.0
+5.0
MAX.
0.8
-5.0
±30
-1.5
30
3
200
+15
+2.5
+1.35
7
0
2.0
2.75
0.8
V
V
V
V
V
V
mA
µA
ns
kbps
6.0
1.0
±2
±6
±100
±500
400
±7
±15
+0.2
0.4
EE
52
±120
7
5
11
V
V
V
kΩ
V
V
kbps
OH
CC
V
V
V
V
mA
V
V/µs
µs
0.4
2.4
200
OL
DD
CONDITIONS
RL = 3kΩ, VIN = 0.8V
RL = 3kΩ, VIN = 2.0V
VOUT = 0V
RL = 3kΩ, VEE = -12.0V; Note 1
CL = 50pF, RL = 3kΩ; TA= 25°C
VOUT from +3V to -3V or
-3V to +3V
kbps
-15
+1.75
+0.75
3
Short Circuit Current
Output Current
Transition Time
Maximum Transmission Rate 1,000
RS-422 RECEIVER
Common Mode Range
Differential Input
Differential Input Threshold
-0.2
Input Voltage Hysteresis
30
Input Resistance
3
TTL Output Level
V
V
2.4
Maximum Receiving Rate
1,000
Short Circuit Output Current
POWER REQUIREMENTS
V = +12V, ±10%
V = +5V; ±10%
V = -12V, ±10%
ENVIRONMENTAL
Operating Temperature
-CS, –CT
0
-MR
-55
Storage Temperature
-65
UNITS
V
V
V
mV
kΩ
V
V
kbps
mA
15
7
20
mA
mA
mA
+70
+125
+150
°C
°C
°C
Note 6
Positive-going
Negative-going
VSS ≤ VIN ≤ V DD
VCC = +4.75V, IOUT = +1.6mA
VCC = +4.75V, IOUT = -0.5mA
I = -20mA
I = +20mA
R = 100Ω
R =∞
Note 2
-0.25V ≤ V ≤ 6V; power off
R = 100Ω, C = 15pF; Note 3
OH
OL
L
L
O
L
L
Note 4
Note 4 and 6
T = 25°C
V = 0V; T = 25°C
-7V ≤ V ≤ +7V
A
CM
A
CM
V = +4.75V, I
V = +4.75V, I
V
CC
OUT
CC
OUT
OUT
= +1.6mA
= -0.5mA
= 0V
Note 5
Note 5
Note 5
Corporation
SIGNAL PROCESSING EXCELLENCE
Notes:
1.
2.
3.
4.
5.
6.
In Loop-back mode
Only one output drive pin per package will be shorted at any time
From 10% to 90% of steady-state
This is an absolute maximum rating; normal operating levels are V < 5V
Outputs unloaded; Inputs tied to GND; T = +25°C; V = 0V; LB=0
Typical SP302 current drains under full load are:
18mA (+12V), 10mA (-12V) and 7mA (+5V) in RS-232 mode only;
5mA (+12V), 7mA (-12V) and 56mA (+5V) in RS-422 mode only;
12mA (+12V), 14mA (-12V) and 31mA (+5V) in RS-232 and RS-422 modes;
RS-232 loads 3kΩ, 2500pF, 20kHz; RS-422 outputs across 100Ω, 500kHz.
In Loopback mode, the external voltage input to the receiver must not exceed ± 10V, otherwise
the loopback test may be adversely affected.
IN
A
IL
TYPICAL PERFORMANCE CURVES
RS-232 Driver
T IN
RS-232 Receiver
5V
GND
10V
RIN
5V
GND
–5V
T OUT
ROUT 5V
GND
GND
–10V
20kHz
20kHz
RS-422 Driver
RS-422 Receiver
2V
RIN
TIN
GND
TOUT 5V
GND
ROUT 5V
GND
–5V
500kHz
Corporation
SIGNAL PROCESSING EXCELLENCE
2V
GND
–2V
500kHz
53
PIN ASSIGNMENTS
VDD (+12V) 1
RIA2 2
RIA1 3
TOB1 8
TOB2 9
20 TIA
19 LB
18 N.C.
17 TIB
16 N.C.
RIB1 10
RIB2 11
15 ROB
14 N.C.
GND 12
13 VEE (-12V)
28 VCC (+5V)
27 N.C.
26 ROA
25 N.C.
24 N.C.
23 TIA
22 LB
21 N.C.
20 TIB
TOA2 4
TOA1 5
SELECT A 6
SELECT B 7
TOB1 8
TOB2 9
15 VEE (-12V)
GND 14
17 ROB
FEATURES…
The SP301 and SP302 are proprietary singlechip devices that contain both RS-232 and RS422 protocol line drivers and receivers. They
differ only in the total number of line drivers and
receivers of each protocol that may be active at
any given time. Their configuration may be
changed at any time by logic levels on two
control lines. In any configuration, both the
SP301 and SP302 fully meet the requirements
of the EIA RS-232D and RS-422 data communication standards.
20 TIA1
19 LB
18 N.C.
17 TIB1
16 TIB2
15 ROB1
13 VEE (-12V)
VDD (+12V) 1
RIA2 2
RIA1 3
N.C. 4
TOA2 5
TOA1 6
SELECT A 7
SELECT B 8
TOB1 9
21 TIA2
14 ROB2
GND 12
16 N.C.
18 N.C.
23 ROA2
22 ROA1
RIB1 10
RIB2 11
TOB2 10
N.C. 11
RIB1 12
RIB2 13
19 N.C.
24 VCC (+5V)
28 VCC (+5V)
27 ROA2
26 ROA1
25 N.C.
24 TIA2
SP302CT
SP301CT
VDD (+12V) 1
RIA2 2
RIA1 3
N.C. 4
TOA2 5
TOA1 6
SELECT A 7
SELECT B 8
TOB1 9
TOB2 10
N.C. 11
RIB1 12
RIB2 13
GND 14
21 N.C.
VDD (+12V) 1
RIA2 2
RIA1 3
SP302CS/MR
SELECT A 6
SELECT B 7
22 ROA
SP301CS/MR
TOA2 4
TOA1 5
24 VCC (+5V)
23 N.C.
23 TIA1
22 LB
21 N.C.
20 TIB1
19 TIB2
18 N.C.
17 ROB1
16 ROB2
15 VEE (-12V)
The RS-422 receivers convert the EIA RS-422
differential input signals into non-inverted TTL
output logic levels. Receiver input filtering provides excellent high frequency noise immunity.
Input pulses with widths less than 1µs are completely ignored. The RS-232 receivers have the
additional feature of voltage hysteresis, which
helps eliminate spurious output transitions that
might result from low amplitude noise voltages
during slower-speed signal transitions.
The RS-232 line driver circuits convert TTL
logic level inputs into inverted RS-232 output
signals. The RS-422 line drivers convert TTL
logic levels into RS-422 differential output signals. The RS-422 line driver outputs feature
high source and sink current capability. All line
drivers are internally protected against short
circuits on their outputs.
A loopback test mode is provided that puts the
driver outputs to a high impedance tri-state
level, and routes the driver outputs to their
associated receiver inputs. In this configuration,
the signal path is non-inverting from the TTL
driver input to the receiver TTL output. This
operating mode allows the controlling system to
perform diagnostic self-test of the RS-232/RS422 driver/receiver circuitry at speeds up to
3,000 bits per second.
The RS-232 receivers convert the EIA RS-232
input signals to inverted TTL output logic levels.
The SP301 and SP302 are available in 24-pin
single–width (0.300") plastic DIP and 28-pin
54
Corporation
SIGNAL PROCESSING EXCELLENCE
VDD
VDD
VCC
VCC
SP301/302
3.3kΩ
VEE
GND
VEE
3.3kΩ
2N2222
Q4
Q3
a)
b)
VDD
VDD
3.3kΩ
VCC
VCC
SP301/302
GND
VEE
VDD
VCC
VEE
SP301/302
GND
3.3kΩ
VEE
2N2222
Q3
Q4
Figure 1. Isolating SP301/302 From Ground;
a) Single SP301/302; b) Multiple SP301/302
SOIC packages for operation over the commercial
temperature range.
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 VDD and V EE,
and 4.0V for VCC. Under these supply conditions, derated performance can be expected.
POWER SUPPLY SEQUENCING
There are two requirements for power supply
sequencing for the SP301/302. The first is that
VDD is always greater than VCC. The second is
that when the part is powered up, VDD must be
applied 20ms before VCC.
GENERAL USAGE
RS232 Operation
The SP301 and SP302 are fully compliant
RS-232 devices. Their outputs are fully protected against shorts to ±20V with no external
Corporation
SIGNAL PROCESSING EXCELLENCE
circuitry. If the potential exists for momentary
shorts to voltages greater than ±20V, it is recommended that a 220Ω 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 SP301/302 transmitter output occupies a
data 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 standards require that with no power applied to the
device, the impedance from a transmitter output
to ground must be greater than 300Ω. This can
be easily achieved as shown in Figure 1a, where
an external transistor is used as a switch to
VDD
VDD
3.3kΩ
VCC
VCC
VEE
VEE
SELECT A = 1
GND
3.3kΩ
SP302
2N2222
Q3
Q4
SELECT B = 0
LOOPBACK = 1
TIB1
TOB1
TIB2
TOB2
TIA1
TOA1
ROB1
RIB1
ROB2
RIB2
TOA2
ROA1
RIA1
RIA2
Figure 2. Typical Circuit
55
isolate an SP301/302 from ground in the poweroff condition. With VDD 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 SP301/302s can be connected as shown
in Figure 1b.
RS-422 OPERATION
The SP301 and SP302 are fully compliant
RS-422 devices when operating in the RS-422
mode. Baud rate and drive capability have been
balanced to provide as much versatility as possible. The SP301 and SP302 are both guaranteed for a 1Mbps data rate, supplying ±2V
minimum into a 100Ω load. Short circuit protection for the RS-422 operating mode is the same
as in the RS-232 mode. The driver outputs can
be shorted to ground for an infinite duration,
with a maximum current of ±100mA.
The RS-422 receivers accept differential signals
at a 1Mbps rate, and translate them to a noninverted TTL output. The receivers are specified with a ±15V differential input voltage,
56
which means that to operate normally, the difference betweeen the voltages at the inputs
cannot exceed ±15V. The common mode voltage is specified as ±7V. This identifies the
midpoint of the range about which the differential input must lie so that the receiver can detect
a change of state. Within this ±7V range, the
receivers will recognize a change in state with a
±200mV differential threshold voltage. Since
the RS-232 and RS-422 inputs are shared, all
receiver inputs are protected to ±30V to guard
against inadvertently applying an RS-232 signal
to an input that is configured for RS-422. Figure
2 shows a typical circuit for the SP301/302. In
this case the SP302 is shown configured for one
(1) duplex RS-422 and two (2) duplex RS-232
communication paths.
CONFIGURING THE SP301/302
Figures 3, 5 and 6 show the various combinations of simultaneous RS-232 and RS-422 operation that can be achieved with the SP301.
Similarly, Figures 4, 7 and 8 show the various
combinations for the SP302. Each of these configurations are software selectable by logic level
on the SELECT A and SELECT B control lines.
Configuration can be changed “on-the-fly”.
Corporation
SIGNAL PROCESSING EXCELLENCE
FIGURE 3: SP301 CONTROL LOGIC CONFIGURATION
SELECTION
LOGIC VALUE
LOGIC VALUE
LOGIC VALUE
LOGIC VALUE
SELECT A:
SELECT B:
0
0
0
1
1
0
1
1
NON–
LOOPBACK
(LB = 1)
RIA1
TOA1
RIB1
TOB1
ROA
TIA
ROB
TIB
RIA1
TOA1
RIB2
RIB1
TOB1
TOB2
ROA
TIA
ROB
TIB
LOOPBACK
(LB=0)
RIA1
TOA*1
RIB1
TOB*1
ROA
Corporation
TOA1
TOA2
TIA
RIB1
ROB
TOB1
RIA2
RIA1
ROA
TOA1
TOA2
RIB2
RIB1
TOB1
TOB2
TIB
ROA
TIA
ROB
TIB
ROA
RIA2
RIA1
ROA
RIA2
RIA1
ROA
TIA
TOA*1
TOA*2
TIA
TOA*1
TOA*2
TIA
ROB
RIB2
RIB1
ROB
TIB
TOB*1
TOB*2
TIB
TIA
TOA*1
ROB
RIB2
RIB1
ROB
TIB
TOB*1
TOB*2
TIB
RS-232 DRIVER
* Tri–state Output
SIGNAL PROCESSING EXCELLENCE
RIA1
RIA2
RIA1
RS-232 RECEIVER
RIB1
TOB*1
RS-422 RECEIVER
RS-422 DRIVER
57
FIGURE 4: SP302 CONTROL LOGIC CONFIGURATION
SELECTION
LOGIC VALUE
LOGIC VALUE
LOGIC VALUE
LOGIC VALUE
SELECT A:
SELECT B:
0
0
0
1
1
0
1
1
NON–
LOOPBACK
(LB = 1)
RIA2
ROA2
RIA2
ROA2
RIA1
ROA1
RIA1
ROA1
TOA1
TOA2
RIB2
RIB1
LOOPBACK
(LB=0)
TIA1
TIA2
ROB2
ROB1
TOB1
TIB1
TOB2
TIB2
TOA2
RIB2
RIB1
TOB1
TOB2
RIA2
ROA2
RIA2
RIA1
ROA1
RIA1
TIA1
TIA2
ROB1
TIB1
TIA1
TOA*2
TIA2 TOA*2
TIA2
RIB1
ROB1
TOB1
TIB1
TOB2
TIB2
RS-232 DRIVER
* Tri–state Output
TOA1
TOA2
TIA1
RIB2
ROB2
RIB1
ROB1
TOB1
TIB1
TOB2
TIB2
RIA2
ROA1 RIA1
TIA1 TOA*1
ROB2
RIA2
RIA1
ROA1
RIB2
RIB1
ROB1
TOB*1
TOB*2
TIB1
RS-232 RECEIVER
TOA*1
TOA*2
ROA1
TOA1
TOA2
TIA1
RIB2
RIB1
TOB1
TOB2
ROA2
TOA*1
RIB2
58
TOA1
RIA2
RIA1
RIA2
RIA1
ROA1
ROB1
TIB1
ROA1
TOA*1
TIA1 TOA*
2
RIB2
ROB2
RIB1
ROB1
TOB1
TIB1
TOB2
TIB2
TIA1
RIB2
RIB1
ROB1
TOB*1
TOB*2
TIB1
RS-422 RECEIVER
RS-422 DRIVER
Corporation
SIGNAL PROCESSING EXCELLENCE
FIGURE 5: SP301 CONFIGURATIONS
Two-Channel Full Duplex RS-232
Two independent channels of RS-232 line driver
and two channels of RS-232 receiver.
One-Channel Full Duplex RS-232 &
One-Channel Full Duplex RS-422
A single RS-232 line driver and receiver, and a
single RS-422 line driver and receiver.
TIA
TOA1
TIA
TOA1
TIB
TOB1
ROA
RIA1
RS-232 LINE DRIVERS
RS-232 LINE DRIVER & RECEIVER
RS-232 RECEIVERS
RS-422 LINE DRIVER & RECEIVER
ROA
RIA1
TOB1
TIB
TOB2
RIB1
ROB
RIB1
ROB
RIB2
SELECT A = 0
SELECT B = 0
LB = 1
SELECT A = 0
SELECT B = 1
LB = 1
Corporation
SIGNAL PROCESSING EXCELLENCE
59
FIGURE 6: SP301 CONFIGURATIONS
One-Channel Full Duplex RS-232 &
One-Channel Full Duplex RS-422
Opposite Drivers
Two-Channel Full Duplex RS-422
Two RS-422 line drivers and two RS-422
receivers.
A single RS-232 line driver and receiver, and a
single RS-422 line driver and receiver. At first
glance, this is the same configuration as that in
Figure 5. Note however that functions are activated on the opposite channels as that of those in
Figure 1b.
TOA1
TIA
TOA2
RIA1
ROA
TOA1
TIA
TOA2
TOB1
TIB
TOB2
RIA2
RS-422 LINE DRIVER & RECEIVER
RS-422 LINE DRIVERS
RS-232 LINE DRIVER & RECEIVER
RS-422 RECEIVERS
TOB1
TIB
RIA1
ROA
RIA2
RIB1
ROB
RIB1
ROB
RIB2
60
SELECT A = 1
SELECT A = 1
SELECT B = 0
SELECT B = 1
LB = 1
LB = 1
Corporation
SIGNAL PROCESSING EXCELLENCE
FIGURE 7: SP302 CONFIGURATIONS
Four-Channel Duplex RS-232
Four independent channels of RS-232 line driver
and four channels of RS-232 receiver.
Two-Channel Duplex RS-232 &
One-Channel Duplex RS-422
Two RS-232 line drivers and receivers, and a
single RS-422 line driver and receiver.
TIA1
TOA1
TIA1
TOA1
TIA2
TOA2
TIA2
TOA2
TIB1
TOB1
RS-232 LINE DRIVERS
RS-232 RECEIVERS
TIB2
TOB2
RIA1
ROA1
RIA2
RS-232 LINE DRIVERS
RS-232 RECEIVERS
ROA2
RIA1
RIA2
ROA2
TOB2
RS-422 LINE DRIVER
RS-422 RECEIVER
RIB1
ROB1
RIB2
ROB2
TOB1
TIB1
ROA1
RIB1
RIB2
ROB1
SELECT A = 0
SELECT B = 1
LB = 1
SELECT A = 0
SELECT B = 0
LB = 1
Corporation
SIGNAL PROCESSING EXCELLENCE
61
FIGURE 8: SP302 CONFIGURATIONS
Two-Channel Duplex RS-232 &
One-Channel Duplex RS-422
Opposite Drivers
Two-Channel Duplex RS-422
Two RS-422 line drivers and two RS-422
receivers.
Two RS-232 line drivers and receivers, and a
single RS-422 line driver and receiver. At first
glance, this is the same configuration in Figure
7. Note however that functions are activated on
the opposite channels.
TOB1
TIB1
TIA1
TOB2
TIB2
TIB1
TOA1
TOA2
TOB1
TOB2
RS-232 LINE DRIVERS
RS-422 LINE DRIVERS
RS-232 RECEIVER
RIB1
ROB1
RS-422 RECEIVERS
ROA1
RIB2
ROB2
RIA1
RIA2
RIB1
ROB1
RIB2
TOA1
TIA1
TOA2
SELECT A = 1
SELECT B = 1
RS-422 LINE DRIVER
RS-422 RECEIVER
ROA1
LB = 1
RIA1
RIA2
SELECT A = 1
SELECT B = 0
LB = 1
62
Corporation
SIGNAL PROCESSING EXCELLENCE
LOOPBACK
Both the SP301 and SP302 have a function called
loopback, which is essentially a chip self-test. However, by connecting system test loops with the inputs
and outputs of the SP301/302, a system-level diagnostic can be run on power-up or on command. The
test loops can be enabled and disabled allowing both
system test and operation with the same components.
A maximum data rate for loopback of 3kbps is
recommended.Loopbackisapin-programmablefunction, activated by a logic low on the LB pin (19). As
SP301 CONFIGURATIONS IN LOOPBACK MODE
Two -Channel Full Duplex RS-232
TOA1
TIA
One-Channel Full Duplex RS-232 &
One-Channel Full Duplex RS-422
TOA1
TIA
10k
10k
TIB
TOB1
RS-232 LINE DRIVERS
VEE
RS-232 LINE DRIVER
RS-232 RECEIVER
RS-232 RECEIVERS
ROA
RIA1
ROB
RIB1
SELECT A = 0
RIA1
ROA
VEE
10k
10k
TOB2
TIB
TOB1
SELECT B = 0
LB = 1
10k
10k
VEE
RS-422 LINE DRIVER
RS-422 RECEIVER
RIB1
ROB
RIB2
SELECT A = 0
SELECT B = 1
LB = 0 (ACTIVE)
Corporation
SIGNAL PROCESSING EXCELLENCE
63
shown in these figures, the loopback function
internally connects the driver outputs to the
corresponding receiver inputs, and switches the
output pin to a resistive divider of 10kΩ nominal
impedance from VEE to ground. Receiver outputs are left active for signal verification.
During loopback, the receiver inputs are tied to
ground via a 5kΩ pulldown resistor. To minimize loopback errors, the receiver inputs must
be limited to ±10V swings.
SP301 CONFIGURATIONS IN LOOPBACK MODE
One-Channel Full Duplex RS-232 &
One-Channel Full Duplex RS-422
Opposite Drivers
VEE
Two-Channel Full Duplex RS-422
10k
VEE
10k
TOA2
10k
10k
TOB1
TIB
TIA
TOB2
TOA1
10k
10k
10k
10k
VEE
RS-422 LINE DRIVER
RS-422 RECEIVER
RS-422 LINE DRIVER
RS-422 RECEIVER
VEE
RIB2
ROB
RIA1
RIB1
ROA
RIA2
10k
VEE
10k
TIA
TOA2
TOB1
TIB
TOA1
10k
10k
RS-232 LINE DRIVER
64
10k
RS-422 LINE DRIVER
RS-422 RECEIVER
RS-232 RECEIVER
RIB1
ROB
10k
VEE
VEE
RIA2
ROA
RIA1
SELECT A = 1
SELECT A = 1
SELECT B = 0
SELECT B = 1
LB = 0 (ACTIVE)
LB = 0 (ACTIVE)
Corporation
SIGNAL PROCESSING EXCELLENCE
SP302 CONFIGURATIONS IN LOOPBACK MODE
Four-Channel Duplex RS-232
Two-Channel Duplex RS-232 &
One-Channel Duplex RS-422
TOA1
TIA1
10k
RS-232 LINE DRIVER
10k
VEE
10k
RS-232 RECEIVER
ROA1
10k
VEE
TIB1
RIA1
TOB2
TOB1
10k
TIA2
TOA2
VEE
RS-422 LINE DRIVER
10k
RS-232 LINE DRIVER
10k
VEE
RS-422 RECEIVER
ROB1
RIB1
RIB2
RS-232 RECEIVER
ROA2
10k
RIA2
TOA1
TIA1
TOB1
TIB1
10k
10k
RS-232 LINE DRIVER
10k
VEE
RS-232 RECEIVER
ROA1
RS-232 RECEIVER
ROB1
RS-232 LINE DRIVER
10k
VEE
RIA1
RIB1
TOA2
TIA2
TOB2
TIB2
10 k
10k
RS-232 LINE DRIVER
10k
VEE
RS-232 LINE DRIVER
VEE
RS-232 RECEIVER
ROA2
RS-232 RECEIVER
10k
RIA2
RIB2
ROB2
SELECT A = 0
SELECT B = 1
SELECT A = 0
LB = 0 (ACTIVE)
SELECT B = 0
LB = 0 (ACTIVE)
Corporation
SIGNAL PROCESSING EXCELLENCE
65
SP302 CONFIGURATIONS IN LOOPBACK MODE
Two-Channel Duplex RS-422
Two-Channel Duplex RS-232 &
One-Channel Duplex RS-422
Opposite Drivers
TIB2
10k
TOB2
VEE
10k
10k
TIB1
TOB1
10k
VEE
TIB1
TOB2
TOB1
10k
10k
RS-232 LINE DRIVERS
VEE
10k
10k
RS-422 RECEIVERS
RS-232 RECEIVERS
ROB2
RIB2
ROB1
RIB1
RIB1
ROB1
RIB2
10k
VEE
10k
TIA1
VEE
10k
10k
TIA1
10k
TOA2
RS-422 LINE DRIVERS
RS-422 RECEIVERS
10k
VEE
RS-422 RECEIVER
ROA1
TOA2
TOA1
TOA1
RS-422 LINE DRIVER
VEE
RS-422 LINE DRIVERS
ROA1
10k
VEE
RIA1
RIA2
10k
RIA1
SELECT A = 1
RIA2
SELECT B = 1
LB = 0 (ACTIVE)
SELECT A = 1
SELECT B = 0
LB = 0 (ACTIVE)
66
Corporation
SIGNAL PROCESSING EXCELLENCE
ORDERING INFORMATION
Max # of Duplex Channels
Model
RS232
RS422
Temperature
Package
SP301CS .......... 2 ........................ 2 ............. 0°C to +70°C .......................... 24-pin single–width plastic DIP
SP301CT .......... 2 ........................ 2 ............. 0°C to +70°C ........................................................ 28-pin SOIC
SP301ES .......... 2 ........................ 2 ......... -40°C to +85°C .......................... 24-pin single–width plastic DIP
SP301ET .......... 2 ........................ 2 ......... -40°C to +85°C ........................................................ 28-pin SOIC
SP302CS ..........
SP302CT ..........
SP302ES ..........
SP302ET ..........
Corporation
SIGNAL PROCESSING EXCELLENCE
4 ........................ 2
4 ........................ 2
4 ........................ 2
4 ........................ 2
............. 0°C to +70°C .......................... 24-pin single–width plastic DIP
............. 0°C to +70°C ........................................................ 28-pin SOIC
......... -40°C to +85°C .......................... 24-pin single–width plastic DIP
......... -40°C to +85°C ........................................................ 28-pin SOIC
67
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68
Corporation
SIGNAL PROCESSING EXCELLENCE