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SP331 Datasheet Preview

SP331 Datasheet

Programmable Dual RS-232/RS-485 Transceiver

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SP331
Programmable Dual RS-232/RS-485 Transceiver
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 transceiv-
ers 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
FEATURES
■■ +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
Ordering Information - Back Page
+5V
0.1µF
0.1µF
+5V
+5V
TTL/CMOS
TTL/CMOS
TTL/CMOS
TTL/CMOS
TTL/CMOS
TTL/CMOS
TTL/CMOS
TTL/CMOS
5
9 C1+
12 C1-
11 C2+
VCC
10
SP331
V+
V- 14
0.1µF
13 C2-
24
2
SEL A
SEL B
Vcc
400KΩ
26 TI1
27 TI2 Vcc
400KΩ
28 TI3
T1
T3
1 TI4
19 RX1
R1
20 RX2
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
REV 1.0.1
1/13




MaxLinear

SP331 Datasheet Preview

SP331 Datasheet

Programmable Dual RS-232/RS-485 Transceiver

No Preview Available !

SP331
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(1)
Storage Temperature..................................-65˚C to +150˚C
Power Dissipation
28-pin WSOIC.............................. 1000mW
Package Derating
28-pin WSOIC
ѲJA................................................. 40˚C/W
NOTE:
1. Exceeding the maximum data rate of 8Mbps at TA = 85˚C may permanently
damage the device.
Electrical Characteristics
Limits are specified at TA = 25°C and VCC = +5.0V unless otherwise noted.
PARAMETER
Logic Inputs
MIN.
TYP.
MAX.
UNITS
VIL
VIH
Logic Outputs
0.8 V
2.0 V
VOL
VOH
RS-232 Driver
0.4 V
2.4 V
DC Characteristics
HIGH Level Output
LOW Level Output
Open Circuit Voltage
Short Circuit Current
Power Off Impedance
AC Characteristics
Slew Rate
+5.0
-15.0
-15
300
+15.0
-5.0
+15
±100
30
V
V
V
mA
V/µs
Transistion Time
1.5 µs
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
kbps
2 8 µs
2 8 µs
1.7 3.0
V
0.8 1.2
V
+2.0 V
3 5 7 kΩ
CONDITIONS
IOUT = -3.2mA
IOUT = 1.0mA
RL = 3kΩ, VIN = 0.8V
RL = 3kΩ, VIN = 2.0V
VOUT = 0V
VCC = 0V, VOUT = ±2.0V
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
VIN = +15V to -15V
REV 1.0.1
2/13


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






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