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EXAR

SP331 Datasheet Preview

SP331 Datasheet

Programmable Dual RS-232/RS-485 Transceiver

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SP331
Programmable Dual 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
TI4 1
SEL_B 2
TX4 3
TX3 4
VCC 5
TX1 6
TX2 7
GND 8
C1+ 9
V+ (VDD) 10
C2+ 11
C1– 12
C2– 13
V– (VSS) 14
28 TI3
27 TI2
26 TI1
25 SEL_C
24 SEL_A
23 SEL_D
22 RX4
21 RX3
20 RX2
19 RX1
18 RI4
17 RI3
16 RI2
15 RI1
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 speci-
fications. 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.
TYPICAL APPLICATIONS CIRCUIT
0.1µF
0.1µF
+5V
+5V
TTL/CMOS
TTL/CMOS
TTL/CMOS
TTL/CMOS
TTL/CMOS
TTL/CMOS
TTL/CMOS
TTL/CMOS
+5V
5
9 C1+
12 C1-
11 C2+
VCC
SP331
10
V+
V- 14
0.1µF
13 C2-
24
2
SEL A
SEL B
Vcc
400KΩ
26 TI1
27 TI2 Vcc
400KΩ
28 TI3
1 TI4
19 RX1
20 RX2
T1
T3
R1
0.1µF
23
SEL D
0V
TX2 7
TX1 6
TX4 3
TX3 4
RI2 16
15KΩ
RI1 15
15KΩ
RS-485
RS-485
RS-485
RS-485
RS-485
RS-485
21 RX3
22 RX4
8 GND
R3
RI4 18
15KΩ
RI3 17
15KΩ
25
SEL C
RS-485
RS-485
0V
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7017 • www.exar.com

SP331_100_012610




EXAR

SP331 Datasheet Preview

SP331 Datasheet

Programmable Dual RS-232/RS-485 Transceiver

No Preview Available !

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
Input Voltages
Logic............................-0.5V to (Vcc+0.5V)
Drivers.........................-0.5V to (Vcc+0.5V)
Receivers......................+/-30V @ ≤100mA
Driver Outputs..................................................+/-15V
Maximum Data Rate..........................8Mbps (Note 1)
Storage Temperature.......................-65˚C to +150˚C
Power Dissipation
28-pin WSOIC...................................1000mW
Package Derating:
28-pin WSOIC
øJA................................................40 °C/W
SPECIFICATIONS
Limits are specified at TA = 25°C and VCC = +5.0V unless otherwise noted.
PARAMETER
MIN. TYP. MAX.
Logic Inputs
VIL
VIH
LOGIC OUTPUTS
0.8
2.0
VOL
VOH
RS-232 DRIVER
0.4
2.4
DC Characteristics
HIGH Level Output
+5.0 +15.0
LOW Level Output
-15.0
-5.0
Open Circuit Voltage
-15
+15
Short Circuit Current
+/-100
Power Off Impedance
300
AC Characteristics
Slew Rate
30
Transistion Time
1.5
Maximum Data Rate
Propagation Delay tPHL
Propagation Delay tPLH
RS-232 RECEIVER
DC Characteristics
HIGH Threshold
LOW Threshold
Receiver Open Circuit Bias
Input Impedance
120 235
2
2
8
8
1.7 3.0
0.8 1.2
+2.0
357
UNITS CONDITIONS
Volts
Volts
Volts
Volts
IOUT = -3.2mA
IOUT = 1.0mA
Volts
Volts
Volts
mA
RL = 3kΩ, VIN = 0.8V
RL = 3kΩ, VIN = 2.0V
VOUT = 0V
VCC = 0V, VOUT = +/-2.0V
V/µs
µs
kbps
µs
µs
RL = 3kΩ, CL = 50pF; VCC = +5.0V,
TA @ 25°C
RL = 3kΩ, CL = 2500pF; between
+/-3V, TA @ +25°C
RL = 3kΩ, CL = 2500pF
Measured from 1.5V of VIN to 50%
of VOUT; RL = 3kΩ
Volts
Volts
Volts
kΩ
VIN = +15V to -15V
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7017 • www.exar.com

SP331_100_012610


Part Number SP331
Description Programmable Dual RS-232/RS-485 Transceiver
Maker EXAR
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SP331 Datasheet PDF






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