SIPEX SP331CT

®
SP331
Programmable RS-232/RS-485 Transceiver
■ +5V Only Operation
■ Software Programmable RS-232 or
RS-485 Selection
■ Four RS-232 Transceivers in RS-232
Mode
■ Two RS-485 Full-Duplex Transceivers
in RS-485 Mode
■ Two RS-232 Transceivers and One
RS-485 Transceiver in Dual Mode
■ Self-Testing Loopback Mode
■ Full Driver Tri-State (Hi-Z) Control
■ Ideal for RS-232 to RS-485 conversion
DESCRIPTION…
The SP331 is a programmable RS-232 and/or RS-485 transceiver IC. The SP331 contains four
drivers and four receivers when selected in RS-232 mode; and two drivers and two receivers
when selected in RS-485 mode. The SP331 also contains a dual mode which has two RS-232
drivers/receivers plus one differential RS-485 driver/receiver.
The RS-232 transceivers can typically operate at 230kbps while adhering to the RS-232
specifications. The RS-485 transceivers can operate up to 10Mbps while adhering to the RS-485
specifications. The SP331 includes a self-test loopback mode where the driver outputs are
internally configured to the receiver inputs. This allows for easy diagnostic serial port testing
without using an external loopback plug. The RS-232 and RS-485 drivers can be disabled
(High-Z output) by controlling a set of four select pins.
SP331DS/13
1
2
3
4
5
6
7
8
9
10
11
12
13
14
SP331
TI4
SEL_B
TX4
TX3
VCC
TX1
TX2
GND
C1+
V+ (VDD)
C2+
C1–
C2–
V– (VSS)
28
27
26
25
24
23
22
21
20
19
18
17
16
15
TI3
TI2
TI1
SEL_C
SEL_A
SEL_D
RX4
RX3
RX2
RX1
RI4
RI3
RI2
RI1
SP331 RS-232/RS-485 Serial Transceiver
1
© Copyright 2000 Sipex Corporation
ABSOLUTE MAXIMUM RATINGS
These are stress ratings only and functional operation
of the device at these ratings or any other above those
indicated in the operation sections of the specifications
below is not implied. Exposure to absolute maximum
rating conditions for extended periods of time may
affect reliability.
VCC...........................................................................+7V
Storage Temperature..........................-65˚C to +150˚C
Power Dissipation
28-pin Plastic DIP...........................1000mW
28-pin Plastic SOIC.......................1000mW
Package Derating:
28-pin Plastic DIP
øJA....................................................40 °C/W
28-pin Plastic SOIC
øJA....................................................40 °C/W
SPECIFICATIONS
Typically 25°C @ Vcc = +5V unless otherwise noted.
MIN.
LOGIC INPUTS
VIL
VIH
LOGIC OUTPUTS
VOL
VOH
RS-232 DRIVER
DC Characteristics
HIGH Level Output
LOW Level Output
Open Circuit Voltage
Short Circuit Current
Power Off Impedance
TYP.
SP331DS/13
0.4
Volts
Volts
+15
–5.0
+15
±100
Volts
Volts
Volts
mA
Ω
30
V/µs
1.5
µs
300
Transition Time
AC Characteristics
Maximum Data Rate
Propagation Delay
tPHL
tPLH
RS-485 DRIVER
DC Characteristics
Open Circuit Voltage
Differential Output
Volts
Volts
2.4
+5.0
–15.0
–15
120
235
2
2
8
8
1.7
1.2
3.0
0.8
3
5
120
235
+2.0
7
CONDITIONS
IOUT= -3.2mA
IOUT= 1.0mA
RL=3kΩ, VIN=0.8V
RL=3kΩ, VIN=2.0V
VOUT = 0V
Vcc = 0V, Vout = ±2.0V
kbps
RL=3kΩ, CL= 50pF
VCC = +5.0V, TA @ +25°C
RL=3kΩ, CL=2500pF ;
between ±3V, TA @ +25°C
RL=3kΩ, CL=2500pF
µs
µs
Measured from 1.5V of VIN
to 50% of VOUT; RL=3kΩ
Volts
Volts
Volts
kΩ
VIN = +15V to –15V
kbps
0.25
0.25
1.5
UNITS
0.8
2.0
AC Characteristics
Slew Rate
Maximum Data Rate
Propagation Delay
tPHL
tPLH
RS-232 RECEIVER
DC Characteristics
HIGH Threshold
LOW Threshold
Receiver Open Circuit Bias
Input Impedance
MAX.
1
1
6.0
5.0
µs
µs
Volts
Volts
SP331 RS-232/RS-485 Serial Transceiver
2
Measured from 50% of VIN
to 1.5V of VOUT.
RL=54Ω, CL=50pF
© Copyright 2000 Sipex Corporation
SPECIFICATIONS
Typically 25°C @ Vcc = +5V unless otherwise noted.
MIN.
RS-485 DRIVER
Balance
Common-Mode Output
Output Current
Short Circuit Current
AC Characteristics
Maximum Data Rate
Output Transition Time
Propagation Delay
tPHL
tPLH
Driver Output Skew
RS-485 RECEIVER
DC Characteristics
Inputs
Common Mode Range
Receiver Sensitivity
Input Impedance
AC Characteristics
Maximum Data Rate
Propagation Delay
tPHL
tPLH
Differential Receiver Skew
ENVIRONMENTAL
Operating Temperature
Commercial (..C..)
Industrial (..E..)
Storage Temperature
SP331DS/13
MAX.
UNITS
±0.2
3.0
±250
Volts
Volts
mA
mA
30
50
Mbps
ns
80
80
10
120
120
20
ns
ns
ns
RL=54Ω
Rise/fall time, 10%–90%
See Figures 2 & 4
RDIFF=54Ω, CL1=CL2=100pF
RDIFF=54Ω, CL1=CL2=100pF
per Figure 4, tSKEW = | tDPLH - tDPHL|
Volts
Volts
kΩ
–7V ≤ VCM ≤ +12V
–7V ≤ VCM ≤ +12V
28.0
10
–7.0
12
±0.2
15
+12.0
±0.3
10
ENABLE TIMING
RS-485 Driver
Enable Time
Enable to Low
Enable to High
Disable Time
Disable From Low
Disable From High
POWER REQUIREMENTS
Supply Voltage VCC
Supply Current ICC
No Load (Tx Disabled)
No Load (RS-232 Mode)
No Load (RS-485 Mode)
TYP.
|VT| - |VT|
RL=54Ω
Terminated in –7V to +10V
Mbps
130
130
10
200
200
20
ns
ns
ns
90
90
150
150
ns
ns
80
80
120
120
ns
ns
+4.75
+5.25
10
15
7
0
–40
–65
CONDITIONS
See Figures 3 & 5
CL=15pF, S1 Closed
CL=15pF, S2 Closed
See Figures 3 & 5
CL=15pF, S1 Closed
CL=15pF, S2 Closed
Volts
15
30
20
mA
mA
mA
+70
+85
+150
°C
°C
°C
SP331 RS-232/RS-485 Serial Transceiver
3
See Figures 2 & 6
RDIFF=54Ω, CL1=CL2=100pF
RDIFF=54Ω, CL1=CL2=100pF
tSKEW = | tPLH – tPHL |; RDIFF=54Ω,
CL1=CL2=100pF
SEL_A ➨ SEL_D = "0001"
SEL_A ➨ SEL_D = "0000"
SEL_A ➨ SEL_D = "1100"
© Copyright 2000 Sipex Corporation
RECEIVER INPUT GRAPH
RS-485 RECEIVER
+1.0mA
–7V
–3V
+6V
+12V
1 Unit Load
Maximum Input Current
versus Voltage
–0.6mA
TEST CIRCUITS
A
CL1
R
DI
VOD
A
RL
RO
B
R
A
B
CL2
VOC
15pF
B
Figure 1. Driver DC Test Load Circuit
Output
Under
Test
500Ω
Figure 2. Driver/Receiver Timing Test Circuit
S1
VCC
CL
S2
Figure 3. Driver Timing Test Load #2 Circuit
SP331DS/13
SP331 RS-232/RS-485 Serial Transceiver
4
© Copyright 2000 Sipex Corporation
SWITCHING WAVEFORMS
f ≥ 1MHz; tR ≤ 10ns; tF ≤ 10ns
+3V
1.5V
DRIVER INPUT
0V
B
DRIVER
OUTPUT
1.5V
tPLH
tPHL
VO 1/2VO
1/2VO
A
tDPLH
DIFFERENTIAL VO+
OUTPUT 0V
VA – VB VO–
tDPHL
tF
tR
tSKEW = |tDPLH - tDPHL|
Figure 4. Driver Propagation Delays
f = 1MHz; tR < 10ns; tF < 10ns
+3V
1.5V
DE
0V
1.5V
tZL
tLZ
5V
2.3V
A, B
VOL
VOH
A, B
2.3V
0V
Output normally LOW
0.5V
Output normally HIGH
0.5V
tZH
tHZ
Figure 5. Driver Enable and Disable Times
f = 1MHz; tR ≤ 10ns; tF ≤ 10ns
V0D2+
A–B
0V
VOH
RECEIVER OUT
VOL
0V
INPUT
V0D2–
1.5V
1.5V
OUTPUT
tPHL
tPLH
Figure 6. Receiver Propagation Delays
SP331DS/13
SP331 RS-232/RS-485 Serial Transceiver
5
© Copyright 2000 Sipex Corporation
TTL
Input
Driver
Output
Figure 7. Typical RS-232 Driver Output
SP331DS/13
Figure 8. Typical RS-485 Driver Output
SP331 RS-232/RS-485 Serial Transceiver
6
© Copyright 2000 Sipex Corporation
1
2
3
4
5
6
7
8
9
10
11
12
13
14
SP331
TI4
SEL_B
TX4
TX3
VCC
TX1
TX2
GND
C1+
V+ (VDD)
C2+
C1–
C2–
V– (VSS)
28
27
26
25
24
23
22
21
20
19
18
17
16
15
TI3
TI2
TI1
SEL_C
SEL_A
SEL_D
RX4
RX3
RX2
RX1
RI4
RI3
RI2
RI1
Figure 9. SP331 Pinout
+5V
9
0.1µF
0.1µF
0V
0V
C1+
12 C111
C2+
13
C224
SEL A
2
SEL B
+5V
5
VCC
5
9
SP331
V+
V-
10
0.1µF
0.1µF
14
0.1µF
0.1µF
+5V
23
0V
SEL D
+5V
Vcc
Vcc
TX1 6
T1
TTL/CMOS
RS-232
27 TI2
Vcc
TX2 7
TTL/CMOS
T2
TTL/CMOS
400KΩ
TTL/CMOS
28 TI3
TX3 4
T3
RS-232
TTL/CMOS
Vcc
TTL/CMOS
400KΩ
TTL/CMOS
1 TI4
SP331
V-
SEL D
Vcc
TX4 3
T4
TI2
RS-232
28 TI3
1
20
TTL/CMOS
TX1 6
Vcc
19 RX1
RI1 15
R1
TTL/CMOS
TX3 4
RI2 16
R1
TTL/CMOS
RI2 16
RS-232
TTL/CMOS
R2
5KΩ
TTL/CMOS
21 RX3
RI3 17
R3
22
RX4
8 GND
RS-485
RS-485
15KΩ
RI1 15
RS-485
15KΩ
R3
RS-485
15KΩ
RI3 17
5KΩ
20 RX2
RS-485
RS-485
T3
RX2
21 RX3
RS-232
RS-485
TX4 3
RI4 18
TTL/CMOS
0V
T1
TI4
19 RX1
23
TX2 7
26 TI1
27
14
0.1µF
400KΩ
RS-232
0.1µF
V+
400KΩ
26 TI1
400KΩ
TTL/CMOS
10
12 C111
C2+
13
C224
SEL A
2
SEL B
400KΩ
TTL/CMOS
VCC
C1+
RS-485
15KΩ
SEL C
25
0V
RS-232
5KΩ
TTL/CMOS
22 RX4
RI4 18
R4
RS-232
5KΩ
8
GND
SEL C
25
0V
Figure 10. Typical Operating Circuit
SP331DS/13
SP331 RS-232/RS-485 Serial Transceiver
7
© Copyright 2000 Sipex Corporation
FUNCTION TABLE FOR SELECT PINS
A
B
C
D
MODE
0
0
0
0
0
0
0
0
0
0
1
1
0
1
0
1
RS-232
RS-232
RS-232
RS-232
FUNCTION
0
0
0
0
1
1
1
1
0
0
1
1
0
1
0
1
RS-232/RS-485
RS-232/RS-485
RS-232/RS-485
RS-232/RS-485
T1 and T2 active RS-232; T3 tri-state RS-485
T1 and T2 tri-state RS-232; T3 active RS-485
T1 and T2 active RS-232; T3 tri-state RS-485
RS-232 (2ch) / RS-485 (1ch) Loopback
1
1
1
1
0
0
0
0
0
0
1
1
0
1
0
1
RS-485/RS-232
RS-485/RS-232
RS-485/RS-232
RS-485/RS-232
T1 active RS-485; T2 and T3 active RS-232
T1 tr-state RS-485; T3 active RS-232; T4 active RS232
All RS-485 and RS-232 drivers tri-state
RS-485 (1ch) / RS-232 (2ch) Loopback
1
1
1
1
1
1
1
1
0
0
1
1
0
1
0
1
RS-485
RS-485
RS-485
RS-485
All four RS-232 drivers active
All four RS-232 drivers tri-state
All four RS-232 drivers tri-state
RS-232 (4ch) Loopback
T1 and T3 active RS-485
T1 tri-state RS-485; T3 active RS-485
T1 active RS-485; T3 tri-state RS-485
RS-485 (2ch) Loopback
Table 1. Mode Function Table. (Refer to Control Logic Confirmations for Block Diagrams)
THEORY OF OPERATION
The SP331 is made up of four separate circuit
blocks — the charge pump, drivers, receivers,
and decoder. Each of these circuit blocks is
described in more detail below.
+5V, the voltage potential across capacitor C2
is now 10V.
Phase 2
— VSS transfer — Phase two of the clock connects the negative terminal of C2 to the VSS
storage capacitor and the positive terminal of C2
to ground, and transfers the generated –l0V to
C3. Simultaneously, the positive side of capacitor C 1 is switched to +5V and the negative side
is connected to ground.
Charge–Pump
The charge pump is a Sipex–patented design
(U.S. 5,306,954) and uses a unique approach
compared to older less efficient designs. The
charge pump still requires four external
capacitors, but uses a four–phase voltage
shifting technique to attain symmetrical 10V
power supplies. Figure 15(a) shows the
waveform found on the positive side of capcitor
C2, and Figure 15(b) shows the negative side of
capcitor C2. There is a free–running oscillator
that controls the four phases of the voltage
shifting. A description of each phase follows.
Phase 3
— VDD charge storage — The third phase of the
clock is identical to the first phase — the charge
transferred in C1 produces –5V in the negative
terminal of C1, which is applied to the negative
side of capacitor C2. Since C2+ is at +5V, the
voltage potential across C2 is l0V.
Phase 1
— VSS charge storage —During this phase of
the clock cycle, the positive side of capacitors
C1 and C2 are initially charged to +5V. Cl+ is
then switched to ground and charge on C1– is
transferred to C2–. Since C2+ is connected to
SP331DS/13
Phase 4
— VDD transfer — The fourth phase of the
clock connects the negative terminal of C2 to
ground and transfers the generated l0V across
C2 to C4, the VDD storage capacitor. Again,
SP331 RS-232/RS-485 Serial Transceiver
8
© Copyright 2000 Sipex Corporation
simultaneously with this, the positive side of
capacitor C1 is switched to +5V and the negative
side is connected to ground, and the cycle begins
again.
VCC = +5V
C4
+5V
+
C1
–
C2
–5V
+
–
–
+
+
–
VDD Storage Capacitor
Since both V+ and V– are separately generated
from VCC in a no–load condition, V+ and V– will
be symmetrical. Older charge pump approaches
that generate V– from V+ will show a decrease
in the magnitude of V– compared to V+ due to
the inherent inefficiencies in the design.
VSS Storage Capacitor
C3
–5V
Figure 11. Charge Pump Phase 1.
VCC = +5V
C4
+
+
C1
C2
–
–
+
–
+
–
The clock rate for the charge pump typically
operates at 15kHz. The external capacitors must
be 0.1µF with a 16V breakdown rating.
VDD Storage Capacitor
VSS Storage Capacitor
C3
–10V
External Power Supplies
For applications that do not require +5V only,
external supplies can be applied at the V+ and
V– pins. The value of the external supply voltages must be no greater than ±l0V. The current
drain for the ±10V supplies is used for RS-232.
For the RS-232 driver the current requirement
will be 3.5mA per driver. The external power
supplies should provide a power supply sequence of :+l0V, then +5V, followed by –l0V.
Figure 12. Charge Pump Phase 2.
VCC = +5V
C4
+5V
C1
+
–
C2
–5V
+
–
–
+
+
–
VDD Storage Capacitor
VSS Storage Capacitor
C3
–5V
Figure 13. Charge Pump Phase 3.
VCC = +5V
C4
+10V
C1
+
–
C2
+
–
–
+
+
–
VDD Storage Capacitor
VSS Storage Capacitor
C3
Figure 14. Charge Pump Phase 4.
+10V
a) C2+
GND
GND
b) C2-10V
Figure 15. Charge Pump Waveforms
SP331DS/13
SP331 RS-232/RS-485 Serial Transceiver
9
© Copyright 2000 Sipex Corporation
without causing oscillation. To ensure a desired
state of the receiver output, a pull–up resistor of
100kΩ to +5V should be connected to the inverting input for a logic low, or the non–inverting input for a logic high. For single-ended
receivers, a pull–down resistor to ground of 5kΩ
is internally connected, which will ensure a
logic high output.
Drivers
The SP331 has four independent RS-232 singleended drivers and two differential RS-485 drivers. Control for the mode selection is done via
a four–bit control word. The drivers are prearranged 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 suggested. Since the driver inputs are both TTL or
CMOS compatible, any value resistor less than
100kΩ will suffice.
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 15kΩ and a differential threshold
of ±200mV. Since the characteristics of an RS422 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.
When in RS-232 mode, the single-ended RS232 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 3kΩ and 2500pF applied
as specified. These drivers can also operate at
least 120kbps.
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 combinations of RS-232/RS-485 can be configured using 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 drivers.
When programmed to RS-485 mode, the differential RS-485 drivers produce complaint RS485 signals. Each RS-485 driver outputs a unipolar signal on each output pin with a magnitude
of at least 1.5V while loaded with a worst case
of 54Ω between the driver's two output pins.
The signal levels and drive capability of the RS485 drivers allow the drivers to also comply
with RS-422 levels. The transmission rate for
the differential drivers is 10Mbps.
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 outputs 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 disconnected 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 15kΩ to
ground.
Receivers
The SP331 has four single-ended receivers when
programmed for RS-232 mode and two differential 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 operating mode of the receivers is changed, the
electrical characteristics will change to support
the requirements of the appropriate serial standard. Unused receiver inputs can be left floating
SP331DS/13
SP331 RS-232/RS-485 Serial Transceiver
10
© Copyright 2000 Sipex Corporation
SP331 CONTROL LOGIC CONFIGURATION (Refer to Table 1)
SEL A
SEL B
SEL C
SEL D
0
0
0
0
0
0
0
1
26 TI1
TX1 6
T1
27 TI2
TX2 7
T2
28 TI3
0
0
1
0
0
1
0
0
0
1
0
1
26 TI1
19 RX1
R1
20 RX2
R2
21 RX3
R3
RI1 15
28 TI3
T3
RI2 16
19 RX1
22 RX4
TX4 3
R1
20 RX2
R2
R4
TX2 7
1
1
0
1
TX1 6
26 TI1
T1
TX2 7
RI1 15
19 RX1
R1
TX4 3
RI2 16
RI1 15
19 RX1
R1
RI2 16
RI2 16
21 RX3
RI4 18
T3
TX4 3
T4
R3
RI3 17
R3
TX3 4
28 TI3
1 TI4
1
1
1
0
TX3 4
T3
RI1 15
RI3 17
21 RX3
1
1
0
0
TX1 6
T1
TX3 4
TX4 3
T4
1
0
1
0
TX2 7
T2
28 TI3
1 TI4
1
0
0
1
26 TI1
TX3 4
T3
1
0
0
0
TX1 6
T1
27 TI2
0
1
1
0
RI4 18
RI3 17
RI3 17
21 RX3
22 RX4
R4
R3
RI4 18
RI4 18
SP331 LOOPBACK (Refer to Table 1)
SEL A
SEL B
SEL C
SEL D
0
0
1
1
26 TI1
27 TI2
28 TI3
T1
T2
T3
0
1
1
1
TX1 6
TX2 7
26 TI1
19 RX1
20 RX2
21 RX3
T4
R1
R2
R3
28 TI3
TX3 4
T3
SP331DS/13
R4
TX4 3
TX4 3
RI1 15
19 RX1
TX1 6
T1
20 RX2
TX2 7
26 TI1
TX1 6
T1
TX2 7
T3
TX4 3
R1
R2
28 TI3
1 TI4
RI1 15
RI1 15
R1
RI2 16
19 RX1
RI1 15
R1
RI2 16
RI2 16
RI3 17
R3
TX3 4
TX4 3
T4
21 RX3
RI3 17
TX3 4
T3
19 RX1
RI2 16
1
1
1
1
TX2 7
T2
21 RX3
22 RX4
26 TI1
TX3 4
28 TI3
1 TI4
TX1 6
T1
27 TI2
1
0
1
1
RI4 18
RI4 18
R3
21 RX3
22 RX4
R4
SP331 RS-232/RS-485 Serial Transceiver
11
RI3 17
RI4 18
RI3 17
R3
RI4 18
© Copyright 2000 Sipex Corporation
PACKAGE: 28-PIN PLASTIC
SMALL OUTLINE (SOIC)
E
H
D
A
Ø
e
B
A1
L
DIMENSIONS (Inches)
Minimum/Maximum
(mm)
SP331DS/13
28–PIN
A
0.093/0.104
(2.352/2.649)
A1
0.004/0.012
(0.102/0.300)
B
0.013/0.020
(0.330/0.508)
D
0.698/0.706
(17.73/17.93)
E
0.291/0.299
(7.402/7.600)
e
0.050 BSC
(1.270 BSC)
H
0.394/0.419
(10.00/10.64)
L
0.016/0.050
(0.406/1.270)
Ø
0°/8°
(0°/8°)
SP331 RS-232/RS-485 Serial Transceiver
12
© Copyright 2000 Sipex Corporation
ORDERING INFORMATION
Model
Temperature Range
Package Types
SP331CT ........................................................................... 0°C to +70°C .................................................................................. 28-pin Plastic SOIC
SP331ET ........................................................................ -40°C to +85°C .................................................................................. 28-pin Plastic SOIC
Please consult the factory for pricing and availability on a Tape-On-Reel option.
Corporation
SIGNAL PROCESSING EXCELLENCE
Sipex Corporation
Headquarters and
Sales Office
22 Linnell Circle
Billerica, MA 01821
TEL: (978) 667-8700
FAX: (978) 670-9001
e-mail: [email protected]
Sales Office
233 South Hillview Drive
Milpitas, CA 95035
TEL: (408) 934-7500
FAX: (408) 935-7600
Sipex Corporation reserves the right to make changes to any products described herein. Sipex does not assume any liability arising out of the
application or use of any product or circuit described hereing; neither does it convey any license under its patent rights nor the rights of others.
SP331DS/13
SP331 RS-232/RS-485 Serial Transceiver
13
© Copyright 2000 Sipex Corporation