SP337EBCY-L [EXAR]
Line Transceiver, 3 Func, 3 Driver, 5 Rcvr, PDSO28, TSSOP-28;
| 型号： | SP337EBCY-L |
| 厂家： | 
EXAR CORPORATION |
| 描述： | Line Transceiver, 3 Func, 3 Driver, 5 Rcvr, PDSO28, TSSOP-28 驱动 光电二极管 接口集成电路 驱动器 |
| 文件： | 总18页 (文件大小：756K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
SP337E
3.3V TO 5V RS-232/RS-485/RS-422 MULTIPROTOCOL TRANSCEIVER
MARCH 2011
REV. 1.0.2
GENERAL DESCRIPTION
FEATURES
The SP337E is a dual mode serial transceiver
containing both RS-232 and RS-485/422 line drivers
and receivers. The RS-232 mode provides three
drivers and five receivers to support all eight signals
commonly used in the DB9 serial port connector
(3TX/5RX). In RS-485 mode the device features two
independent high speed RS-485/422 transmit and
receive channels (2TX/2RX). The default RS-485
configuration is full-duplex, but half-duplex operation
can be obtained by tying together the TX and RI pins,
and the TXEN and RXEN signals.
• 3.3V to 5V Single Supply Operation
• Robust +/-15kV ESD Protection
■ Human Body Model
• Max Data Rate of 15Mbps in RS-485 mode
and up to 1Mbps in RS-232 mode (SP337EU)
• 3 Drivers, 5 Receivers RS-232/V.28
• 2 Drivers, 2 Receivers RS-485/RS-422
■ Full-Duplex Configuration
The SP337E is pin compatible to Exar’s SP334.
■ 1/8th Unit Load, up to 256 receivers on bus
The SP337EB features a maximum data rate of
250kbps in RS-232 mode and a maximum data rate
of 15Mbps in RS-485. However, the SP337EU
features a maximum data rate of 1Mbps in RS-232
mode and a maximum data rate of 15Mbps in RS-485
mode.
• RS-485 Advanced Failsafe on Open, Short or
Terminated Lines
• Full Differential Driver Tri-State (Hi-Z) Control
• Receiver Output Tri-State Control
• WSOIC-28 or TSSOP-28 Package
The Exar-patented high efficiency charge pumps
(5,306,954) deliver true RS-232 driver output
voltages from a single power supply from 3.3V to 5V.
Charge pump outputs are self-monitored to minimize
power consumption. The SP337E requires only four
0.1μF capacitors for complete functionality.
TYPICAL APPLICATIONS
• Dual Protocol Serial Ports (RS-232 or RS-485)
• Industrial Computers
All RS-485 receivers or transceivers feature high
impedance inputs which allow up to 256 transceivers
on a single shared bus. When configured in RS-485
mode, each driver may be individually enabled or put
into tri-state, simplifying use on shared buses or for
bidirectional communication. The RS-485/422 drivers
can be disabled (high-Z output) by the TXEN enable
pin. The RS-232 receiver outputs can be disabled by
the RXEN enable pin.
• Industrial and Process Control Equipment
• Point-Of-Sales Equipment
• Networking Equipment
• HVAC Controls Equipment
• Building Security Equipment
All receivers have advanced failsafe protection to
prevent oscillation when inputs are un-connected. In
RS-232 mode, each receiver input has a 5kΩ pull-
down to ground. in RS-485 mode, receivers will
default to output logic 1 if inputs are floating, shorted,
or open but terminated.
All driver outputs and receiver inputs are protected
against ESD strikes up to +/-15,000 volts.
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • (510) 668-7000 • FAX (510) 668-7017 • www.exar.com
SP337E
3.3V TO 5V RS-232/RS-485/RS-422 MULTIPROTOCOL TRANSCEIVER
REV. 1.0.2
FIGURE 1. TYPICAL RS-232 AND RS-485 APPLICATION CIRCUITS
ORDERING INFORMATION
OPERATING TEMPERATURE
RANGE
PART NUMBER
PACKAGE
DEVICE STATUS
SP337EBCT-L
SP337EBCY-L
SP337EBET-L
SP337EBEY-L
SP337EUCT-L
SP337EUCY-L
SP337EUET-L
SP337EUEY-L
28-pin WSOIC
28-pin TSSOP
28-pin WSOIC
28-pin TSSOP
28-pin WSOIC
28-pin TSSOP
28-pin WSOIC
28-pin TSSOP
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
Active
Active
Active
Active
Active
Active
Active
Active
2
SP337E
REV. 1.0.2
3.3V TO 5V RS-232/RS-485/RS-422 MULTIPROTOCOL TRANSCEIVER
PIN DESCRIPTIONS
Pin Assignments
DESCRIPTION
PIN #
PIN NAME
TYPE
RS-232
RS-485/RS-422
T3 Driver TTL input
T3 Driver TTL input
1
TI3
Input
This pin has a 400k pull-up to Vcc in both RS-232 and RS-485 modes.
The pull-up is disabled in the SP337EU shutdown mode.
X*
Only RS-485 mode
2
TXEN
Input
This pin has a 400k pull-up to Vcc in both RS-232 and RS-485 modes.
The pull-up is disabled in the SP337EU shutdown mode.
3
TX4
TX3
Vcc
TX1
TX2
GND
C1+
V+
Output
Output
Power
Output
Output
Power
Pump
Pump
Pump
Pump
Pump
Pump
Input
X*
T3(Z) Inverting Output
4
T3 Driver Output
T3(Y) Non-Inverting Output
5
Power Supply Voltage, between 3.3V and 5V
6
T1 Driver Output
T2 Driver Output
T1(Y) Non-Inverting Output
T1(Z) Inverting Output
7
8
Ground
9
Positive Terminal of Positive Flying Capacitor
Vdd Storage Capacitor
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
C2+
C1-
C2-
V-
Positive Terminal of Negative Flying Capacitor
Negative Terminal of Positive Flying Capacitor
Negative Terminal of Negative Flying Capacitor
Vss Storage Capacitor
RI1
R1 Receiver Input, 5k pull-down
R1(B) Receiver Inverting Input
R1(A) Receiver Non-Inverting Input
R3(A) Receiver Non-Inverting Input
R3(B) Receiver Inverting Input
RI2
Input
R2 Receiver Input, 5k pull-down
R3 Receiver Input, 5k pull-down
R4 Receiver Input, 5k pull-down
RI3
Input
RI4
Input
RX1
RX2
RX3
RX4
RX5
RI5
Output
Output
Output
Output
Output
Input
R1 Receiver Output
R2 Receiver Output
X*
R3 Receiver Output
R4 Receiver Output
R5 Receiver Output
X*
X*
X*
R5 Receiver Input, 5k pull-down
RS232/RS485 Input
RXEN Input
Mode select, either RS-232 (low) or RS-485/422 (high) mode
Receiver enable for both RS-232 and RS-485/422 mode (Active low)
3
SP337E
3.3V TO 5V RS-232/RS-485/RS-422 MULTIPROTOCOL TRANSCEIVER
Pin Assignments
REV. 1.0.2
DESCRIPTION
PIN #
PIN NAME
TYPE
RS-232
RS-485/RS-422
T1 Driver Input
T1 Driver Input
27
TI1
Input
This pin has a 400k pull-up to Vcc in both RS-232 and RS-485 modes.
The pull-up is disabled in the SP337EU shutdown mode.
T2 Driver Input
X*
28
TI2
Input
This pin has a 400k pull-up to Vcc in both RS-232 and RS-485 modes.
The pull-up is disabled in the SP337EU shutdown mode.
*
Pins marked with an X in the above table are ignored or "don’t care" in the listed mode, provided
they do not exceed Vcc or go below ground. Some of these pins have a pull-up to Vcc which
remains active in both RS-232 and RS-485 mode, but is disabled in the SP337EU shutdown mode.
4
SP337E
REV. 1.0.2
3.3V TO 5V RS-232/RS-485/RS-422 MULTIPROTOCOL TRANSCEIVER
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 to the
specifications below is not implied. Exposure to absolute maximum rating conditions for extended periods of time may affect reliability and cause permanent
damage to the device.
Supply Voltage VCC
+6.0V
Receiver Input VIN (DC Input Voltage)
-16V to +16V
-0.3V to Vcc + 0.5V
-7.5V to +12.5V
Continuous
Input Voltage at TTL input Pins
Driver Output Voltage (from Ground)
Short Circuit Duration, TXout to GND
Storage Temperature Range
-65°C to + 150°C
+300°C
Lead Temperature (soldering, 10s)
Power Dissipation 28-pin SOIC-W
(derate 17mW/°C above +70°C)
938mW
657mW
Power Dissipation 28-pin TSSOP
(derate 12mW/°C above +70°C)
CAUTION:
ESD (Electrostatic Discharge) sensitive device. Permanent damage may occur on unconnected devices subject to high energy electrostatic fields. Unused
devices must be stored in conductive foam or shunts. Personnel should be properly grounded prior to handling this device. The protective foam should be
discharged to the destination socket before devices are removed.
ELECTRICAL CHARACTERISTICS
UNLESS OTHERWISE NOTED: VCC = +3.3V +/-5% OR +5.0V +/-5%, C1-C4 = 0.1μF; TA = TMIN TO TMAX.
TYPICAL VALUES ARE AT VCC = 3.3V, TA = +25OC.
SYMBOL
PARAMETERS
MIN.
TYP.
MAX. UNITS
CONDITIONS
DC CHARACTERISTICS
ICC
ICC
Supply Current (RS-232)
Supply Current (RS-485)
1.5
7.0
6.0
15
mA No Load, RS232/RS485 = 0V
mA No Load, RS232/RS485 = Vcc
Vcc Shutdown Current
(SP337EU only)
TXEN = 0V, RXEN = Vcc
(SP337EU only)
ICC
1.0
10.0
μA
TRANSMITTER and LOGIC INPUT PINS: Pins 1, 2, 25, 26, 27, 28
VIH
VIH
VIL
Logic Input Voltage HIGH
Logic Input Voltage HIGH
Logic Input Voltage LOW
Logic Input Leakage Current
Logic Input Pull-up Current
Logic Input Hysteresis
2.0
2.4
V
V
Vcc = 3.3V
Vcc = 5.0V
0.8
1.0
V
IIL
μA
μA
V
Input High (Vin = Vcc)
Input Low (Vin = 0V)
IPU
15.0
VHYS
0.5
RS-232 and RS-485/422 RECEIVER OUTPUTS: Pins 19, 20, 21, 22, 23
VOH
VOL
IOUT = 1.0mA
IOUT = -3.2mA
Vcc-0.6
Receiver Output Voltage HIGH
Receiver Output Voltage LOW
V
V
0.4
5
SP337E
3.3V TO 5V RS-232/RS-485/RS-422 MULTIPROTOCOL TRANSCEIVER
REV. 1.0.2
UNLESS OTHERWISE NOTED: VCC = +3.3V +/-5% OR +5.0V +/-5%, C1-C4 = 0.1μF; TA = TMIN TO TMAX.
TYPICAL VALUES ARE AT VCC = 3.3V, TA = +25OC.
SYMBOL
PARAMETERS
MIN.
TYP.
MAX. UNITS
CONDITIONS
IOSS
Receiver Output ShortCircuit Current
+/-40
+/-65
mA 0 < Vo < Vcc
IOZ
Receiver Output Leakage Current
+/-0.1 +/-1.5
Receivers Disabled
μA
SINGLE-ENDED RECEIVER INPUTS (RS-232)
Input Voltage Range
-15
0.6
0.8
+15
V
V
VCC = 3.3V
VCC = 5.0V
VCC = 3.3V
VCC = 5.0V
1.2
1.5
Input Threshold Low
Input Threshold HIGH
V
1.5
1.8
0.5
5
2.0
2.4
V
V
Input Hysteresis
Input Resistance
V
3
7
kΩ
DIFFERENTIAL RECEIVER INPUTS (RS-485 / RS-422)
RIN
VTH
Receiver Input Resistance
Receiver Differential Threshold
Receiver Input Hysteresis
96
kΩ -7V ≤ VCM ≤ +12V
-200
-125
30
-50
mV
ΔVTH
VCM = 0V
VIN = 12V
VIN = -7V
mV
μA
μA
125
IIN
Input Current
-100
SINGLE-ENDED DRIVER OUTPUTS (RS-232)
+/-5.0 +/-5.4
V
V
Output Loaded with 3kΩ to Gnd
No Load Output
VO
Output Voltage Swing
+/-7.0
+/-60
VO = 0V
Short Circuit Current
Power Off Impedance
mA
W
Vcc = 0V; VO = +/-2V
300
10M
DIFFERENTIAL DRIVER OUTPUTS (RS-485 / RS-422)
RL = 100Ω (RS-422), Figure 2
RL = 54Ω (RS-485), Figure 2
VCM = -7V, Figure 3
2
Vcc
Vcc
Vcc
Vcc
V
V
V
V
1.5
1.5
1.5
VOD
Differential Driver Output (Tx_Out)
VCM = +12V, Figure 3
Change In Magnitude of
Differential Output Voltage
ΔVOD
VOC
ΔVOC
IOSD
IO
RL = 54Ω or 100Ω, Figure 2
RL = 54Ω or 100Ω, Figure 2
RL = 54Ω or 100Ω, Figure 2
-0.2
+0.2
3
V
V
V
Driver CommonMode Output Voltage
Change In Magnitude of
0.2
Common Mode Output Voltage
Driver Output Short Circuit Current
Output Leakage Current
+/-250 mA V = +12V to -7V, Figure 4
TXEN = 0V or Shutdown,
+/-100
μA
VO = +12V to -7V
TIMING CHARACTERISTICS
6
SP337E
REV. 1.0.2
3.3V TO 5V RS-232/RS-485/RS-422 MULTIPROTOCOL TRANSCEIVER
UNLESS OTHERWISE NOTED: VCC = +3.3V +/-5% OR +5.0V +/-5%, C1-C4 = 0.1μF; TA = TMIN TO TMAX.
TYPICAL VALUES ARE AT VCC = 3.3V, TA = +25OC.
SYMBOL
PARAMETERS
MIN.
TYP.
MAX. UNITS
CONDITIONS
RS-232 (SP337EB ONLY) DATA RATE = 250kbps, ONE TRANSMITTER SWITCHING
Maximum Data Rate
Receiver Propagation Delay
Receiver Skew
250
kbps RL = 3kΩ, CL = 2500pF
tPHL, tPLH
100
800
ns
ns
CL = 150pF, Figures 20 and 21
CL = 150pF, Figures 20 and 21
⏐tPHL-tPLH
⏐
100
400
tPHL, tPLH
Driver Propagation Delay
Driver Skew
⏐tPHL-tPLH
⏐
ns
Receiver Output Enable time
Receiver Output Disable time
400
400
ns
ns
Vcc = 3.3V, RL = 3kΩ to 7kΩ,
CL = 150pF to 2500pF,
Figures 18 and 19
Transition-Region Slew Rate from
+3.0V to -3.0V or -3.0V to +3.0V
tTHL, TLH
t
4
30
V/μs
RS-232 (SP337EU ONLY) DATA RATE = 1Mbps, ONE TRANSMITTER SWITCHING
RL = 3kΩ, CL = 250pF
Maximum Data Rate
Receiver Propagation Delay
Receiver Skew
1
Mbps
ns
tPHL, tPLH
CL = 150pF, Figures 20 and 21
CL = 150pF, Figures 20 and 21
100
250
⏐tPHL-tPLH
⏐
100
ns
tPHL, tPLH
Driver Propagation Delay
⏐tPHL-tPLH
⏐
Driver Skew
150
400
400
ns
ns
ns
Receiver Output Enable time
Receiver Output Disable time
Vcc = 3.3V, RL = 3kΩ,
Transition-Region Slew Rate from
+3.0V to -3.0V or -3.0V to +3.0V
tTHL, TLH
t
50
V/μs
CL = 150pF, Figures 18 and 19
RS-485/RS-422 (SP337EB and SP337EU) DATA RATE = 15Mbps, ONE TRANSMITTER SWITCHING
RDIFF = 54Ω, CL = 50pF
Figures 5 and 6
Maximum Data Rate
15
20
60
15
Mbps
ns
Differential Output Propagation
Delay Time
tDPHL, tDPLH
120
25
tR, F
⏐tDPHL
tDPLH
t
Driver Rise and Fall Time
ns
Figures 5 and 6
-
Driver Propagation Delay Skew
10
ns
Figures 5 and 6
⏐
tDZH, tDZL
tDHZ, tDLZ
tPHL, tPLH
tZH
Driver Output Enable Time
400
400
150
200
200
200
200
ns
ns
ns
ns
ns
ns
ns
Figures 7, 8, 9 and 10
Figures 7, 8, 9 and 10
Figures 11 and 12
Figures 13 and 14
Figures 13 and 15
Figures 13 and 16
Figures 13 and 17
Driver Output Disable Time
Receiver Propagation Delay
Receiver Enable to Output High
Receiver Enable to Output Low
Receiver Output High to Disable
Receiver Output Low to Disable
80
100
100
100
100
tZL
tHZ
tLZ
7
SP337E
3.3V TO 5V RS-232/RS-485/RS-422 MULTIPROTOCOL TRANSCEIVER
REV. 1.0.2
UNLESS OTHERWISE NOTED: VCC = +3.3V +/-5% OR +5.0V +/-5%, C1-C4 = 0.1μF; TA = TMIN TO TMAX.
TYPICAL VALUES ARE AT VCC = 3.3V, TA = +25OC.
SYMBOL
PARAMETERS
MIN.
TYP.
MAX. UNITS
CONDITIONS
RS-485/RS-422 SHUTDOWN FEATURE APPLIES TO SP337EU ONLY
tDZZV
tDshutdwn
tRZZV
Shutdown to Driver Output Valid
Driver Time to Shutdown
100
100
400
100
400
800
ns
ns
ns
ns
Shutdown to Receiver Output Valid
Receiver Time to Shutdown
tRshutdwn
ESD PROTECTION
ESD Protection for TX and RI
+/-15
+/-2
kV
kV
Human Body Model
Human Body model
Pins 3, 4, 6, 7, 15, 16, 17, 18, 24
All Other Pins
FIGURE 2. RS-485 DRIVER DC TEST CIRCUIT
RL/2
RL/2
VOD
DI
T
VOC
V
CC
FIGURE 3. RS-485 DRIVER COMMON MODE LOAD TEST
DE = 3.3V
375Ω
375Ω
A
DI = 0 or Vcc
60Ω
Tx
VOD
B
VCM
8
SP337E
REV. 1.0.2
3.3V TO 5V RS-232/RS-485/RS-422 MULTIPROTOCOL TRANSCEIVER
FIGURE 4. RS-485 DRIVER OUTPUT SHORT CIRCUIT TEST
EN = 0 or Vcc
A
IOSD
DI = 0 or Vcc
D
B
-7V to +12V
V
FIGURE 5. RS-485 DRIVER PROPAGATION DELAY TEST CIRCUIT
RL
CL
A
54Ω 50pF
DI
Tx
VOD
B
3.3V
FIGURE 6. RS-485 DRIVER TIMING DIAGRAM
Vcc
Vcc/2
Vcc/2
DI
0V
B
tPLH
tPHL
1/2VO
1/2VO
VO
A
tDPLH
90%
10%
tDPHL
+
VO
VDIFF
VA –VB
90%
10%
tF
0V
–
VO
tR
tSKEW= |tDPLH-tDPHL
|
9
SP337E
3.3V TO 5V RS-232/RS-485/RS-422 MULTIPROTOCOL TRANSCEIVER
FIGURE 7. RS-485 DRIVER ENABLE AND DISABLE TEST CIRCUIT
REV. 1.0.2
A
B
S1
DI
Vcc
Tx
OUT
RL = 500Ω
CL = 50pF
GENERATOR
50Ω
FIGURE 8. RS-485 DRIVER ENABLE AND DISABLE TIMING DIAGRAM
Vcc
DE
Vcc/2
0
0
tDZH
0.25V
OUT
VOM = (VOL + Vcc)/2
tDHZ
FIGURE 9. RS-485 DRIVER ENABLE AND DISABLE TEST CIRCUIT 2
Vcc
RL = 500Ω
OUT
A
B
S1
DI
0
Tx
CL = 50pF
GENERATOR
50Ω
10
SP337E
REV. 1.0.2
3.3V TO 5V RS-232/RS-485/RS-422 MULTIPROTOCOL TRANSCEIVER
FIGURE 10. RS-485 DRIVER ENABLE AND DISABLE TIMING DIAGRAM 2
Vcc
Vcc/2
tDLZ
0
DE
tDZL
OUT
VOM = (VOL + Vcc)/2
VOL
0.25V
FIGURE 11. RS-485 RECEIVER PROPAGATION DELAY TEST CIRCUIT
A
OUT
VID
R
B
CL
15pF
RE
FIGURE 12. RS-485 RECEIVER PROPAGATION DELAY TIMING DIAGRAM
+1V
-1V
A
B
tPHL
tPLH
VOH
VOL
1.5V
OUT
11
SP337E
3.3V TO 5V RS-232/RS-485/RS-422 MULTIPROTOCOL TRANSCEIVER
FIGURE 13. RS-485 RECEIVER ENABLE AND DISABLE TIMES TEST CIRCUIT
REV. 1.0.2
OUT
S1
S2
S3
1.5V
Vcc
A
B
1kΩ
-1.5V
R
RE
CL= 15pF
GENERATOR
50Ω
FIGURE 14. RS-485 RECEIVER ENABLE AND DISABLE TIMES TIMING DIAGRAM 1
S1 is open, S2 is closed, S3 = 1.5V
3V
1.5V
RE
t
ZH
VOH
OUT
VOH /2
0V
FIGURE 15. RS-485 RECEIVER ENABLE AND DISABLE TIMES TIMING DIAGRAM 2
S1 is closed, S2 is open, S3 = -1.5V
3V
1.5V
RE
0V
t
ZL
VCC
VOL= VCC /2
OUT
VOL
12
SP337E
REV. 1.0.2
3.3V TO 5V RS-232/RS-485/RS-422 MULTIPROTOCOL TRANSCEIVER
FIGURE 16. RS-485 RECEIVER ENABLE AND DISABLE TIMES TIMING DIAGRAM 3
S1 is open, S2 is closed, S3 = 1.5V
3V
1.5V
RE
tHZ
0.25V
VOH
0V
OUT
FIGURE 17. RS-485 RECEIVER ENABLE AND DISABLE TIMES TIMING DIAGRAM 4
S1 is closed, S2 is open, S3 = -1.5V
3V
1.5V
RE
0V
t
LZ
VCC
OUT
0.25V
VOL
FIGURE 18. RS-232 DRIVER OUTPUT SLEW RATE TEST CIRCUIT
Tx
OUT
CL
GENERATOR
RL
50Ω
13
SP337E
3.3V TO 5V RS-232/RS-485/RS-422 MULTIPROTOCOL TRANSCEIVER
FIGURE 19. RS-232 DRIVER OUTPUT SLEW RATE TIMING DIAGRAM
REV. 1.0.2
3V
Input
OUT
1.5V
0
+3V
-3V
VOL
tTHL
tTLH
FIGURE 20. RS-232 RECEIVER PROPAGATION DELAY TEST CIRCUIT
Rx
OUT
CL
GENERATOR
50Ω
FIGURE 21. RS-232 RECEIVER PROPAGATION DELAY TIMING DIAGRAM
+3V
-3V
1.5V
Input
1.5V
tPLH
tPHL
VOH
VOL
OUT
50%
50%
14
SP337E
REV. 1.0.2
3.3V TO 5V RS-232/RS-485/RS-422 MULTIPROTOCOL TRANSCEIVER
SP337E Mode Configuration tables
TABLE 1: SP337EB
RS232/RS485
Low
TXEN
Ignored
Ignored
RXEN
Low
Operation
RS-232
Charge Pump
Driver and Receiver
Receivers Enabled
3T/5R
3T/5R
ON
ON
Low
High
RS-232
Receivers Disabled
(High-Z Output)
High
High
High
Low
High
Low
Low
High
High
RS-485/422
Full-Duplex
2T/2R
2T/2R
2T/2R
ON
ON
ON
Drivers Disabled
(High-Z Output);
Receivers Enabled
RS-485/422
Full-Duplex
Drivers Enabled;
Receivers Disabled
(High-Z Output)
RS-485/422
Full-Duplex
Drivers Disabled
(High Z output);
Receivers Disabled
(High Z output)
High
High
Low
RS-485/422
Full-Duplex
2T/2R
ON
Drivers Enabled;
Receivers Enabled
TABLE 2: SP337EU
RS232/RS485
Low
TXEN
Ignored
Ignored
RXEN
Low
Operation
Charge Pump
Driver and Receiver
Receivers Enabled
RS-232
3T/5R
3T/5R
ON
ON
Low
High
RS-232
Receivers Disabled
(High-Z Output)
High
High
High
Low
High
Low
Low
High
High
RS-485/422
Full-Duplex
2T/2R
2T/2R
2T/2R
ON
ON
Drivers Disabled
(High-Z Output);
Receivers Enabled
RS-485/422
Full-Duplex
Drivers Enabled;
Receivers Disabled
(High-Z Output)
RS-485/422
Full-Duplex
OFF
(Shutdown)
Drivers Disabled
(High Z output);
Receivers Disabled
(High Z output)
High
High
Low
RS-485/422
Full-Duplex
2T/2R
ON
Drivers Enabled;
Receivers Enabled
15
SP337E
3.3V TO 5V RS-232/RS-485/RS-422 MULTIPROTOCOL TRANSCEIVER
FIGURE 22. 28 PIN WSOIC PACKAGE OUTLINE DRAWING
REV. 1.0.2
16
SP337E
REV. 1.0.2
3.3V TO 5V RS-232/RS-485/RS-422 MULTIPROTOCOL TRANSCEIVER
FIGURE 23. 28 PIN TSSOP PACKAGE OUTLINE DRAWING
17
SP337E
3.3V TO 5V RS-232/RS-485/RS-422 MULTIPROTOCOL TRANSCEIVER
REV. 1.0.2
REVISION HISTORY
DATE
REVISION
1.0.0
DESCRIPTION
December 2010
December 2010
March 2011
Production Release.
1.0.1
Update ESD Information.
1.0.2
Correct Figure 1 RS-485 driver type error.
NOTICE
EXAR Corporation reserves the right to make changes to the products contained in this publication in order to
improve design, performance or reliability. EXAR Corporation assumes no responsibility for the use of any
circuits described herein, conveys no license under any patent or other right, and makes no representation that
the circuits are free of patent infringement. Charts and schedules contained here in are only for illustration
purposes and may vary depending upon a user’s specific application. While the information in this publication
has been carefully checked; no responsibility, however, is assumed for inaccuracies.
EXAR Corporation does not recommend the use of any of its products in life support applications where the
failure or malfunction of the product can reasonably be expected to cause failure of the life support system or
to significantly affect its safety or effectiveness. Products are not authorized for use in such applications unless
EXAR Corporation receives, in writing, assurances to its satisfaction that: (a) the risk of injury or damage has
been minimized; (b) the user assumes all such risks; (c) potential liability of EXAR Corporation is adequately
protected under the circumstances.
Copyright 2011 EXAR Corporation
Datasheet March 2011.
For technical support please email Exar’s Serial Technical Support group at: serialtechsupport@exar.com.
Reproduction, in part or whole, without the prior written consent of EXAR Corporation is prohibited.
18
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