SP330E
RS-232/RS-485/RS-422 TRANSCEIVER WITH 1.65V-5.5V INTERFACE
May 2018
Rev. 1.0.1
GENERAL DESCRIPTION
FEATURES
The SP330 is an advanced multiprotocol transceiver
supporting RS-232, RS-485, and RS-422 serial
standards and featuring a variable low voltage logic
interface, down to 1.65V. Full operation requires only
four external charge pump capacitors.
Robust ESD Protection:
The RS-485/RS-232 mode pin selects RS-485 mode
when high, and RS-232 mode when low. In RS-485
mode the HALF/FULL pin configures the transceiver
as either half or full duplex.
■
±15kV IEC 61000-4-2 Air Gap Discharge
■
± 8kV IEC 61000-4-2 Contact Discharge
■
±15kV Human Body Model (HBM)
20Mbps RS-485 and 1Mbps RS-232 Data Rates
Pin-Selectable 250kbps Slew Limiting
Single Supply Operation from +3V to +5.5V
1.65V to 5.5V Logic Interface VL pin
The high speed drivers operate up to 20Mbps in RS485/422 modes, and up to 1Mbps in RS-232 mode.
All drivers can be slew limited to 250kbps in any
mode to minimize electromagnetic interference (EMI)
by setting the dedicated SLEW pin low.
2 Drivers, 2 Receivers RS-232/V.28
1 Driver, 1 Receiver RS-485/422
All transmitter outputs and receiver inputs feature
robust electrostatic discharge (ESD) protection to
±15kV IEC 61000-4-2 Airgap, ±15kV Human Body
Model (HBM) and ±8kV IEC 61000-4-2 Contact. Each
receiver output has full fail-safe protection to avoid
system lockup, oscillation, or indeterminate states by
defaulting to logic-high output level when the inputs
are open, shorted, or terminated but undriven. No
external biasing resistors are required.
■
Full or Half Duplex Configuration
■
1/8th Unit Load, up to 256 receivers on bus
RS-485/422 Enhanced Receiver Fail-safe for open,
shorted, or terminated but idle inputs
10nA Shutdown Supply Current (typical)
Small 24 TSSOP package
The RS-232 receiver inputs include a 5k pull-down
to ground when in RS-232 mode. The RS-485/422
receiver inputs are high impedance (>96k), allowing
up to 256 devices on a single communication bus
(1/8th unit load).
TYPICAL APPLICATIONS
Software Programmable Serial Ports
(RS-232, RS-422, RS-485)
Industrial and Single Board Computers
Industrial and Process Control Equipment
The SP330 operates from a single power supply,
either 3.3V or 5V, with low idle current. The shutdown
mode consumes less than 1µA in low power standby
operation with RS-232 receivers enabled.
Point-Of-Sale Equipment
HVAC Controls and Networking Equipment
Building Security and Automation
ORDERING INFORMATION(1)
PART NUMBER
SP330EEY-L
SP330EEY-L/TR
SP330EEY-0A-EB
OPERATING TEMPERATURE RANGE
LEAD-FREE
PACKAGE
-40°C to +85°C
Yes(2)
24-pin TSSOP
SP330E Evaluation Board
NOTES:
1.
Refer to www.exar.com/SP330E for most up-to-date Ordering Information.
2.
Visit www.exar.com for additional information on Environmental Rating.
1
PACKAGING METHOD
Tube
Tape and Reel
SP330E
RS-232/RS-485/RS-422 TRANSCEIVER WITH 1.65V-5.5V INTERFACE
REV. 1.0.1
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
-0.3V to +6.0V
Logic Interface Voltage VL
VL VCC
Voltage at TTL Input Pins
-0.3V to +6.0V
Receiver Input Voltage (from Ground)
±18V
Driver Output Voltage (from Ground)
±18V
Short Circuit Duration, TX out to Ground
Continuous
Storage Temperature Range
-65°C to +150°C
Lead Temperature (soldering, 10s)
+300°C
Power Dissipation 24-pin TSSOP
(derate 26.0mW/°C above +70°C)
900mW
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.
ESD RATINGS
HBM - Human Body Model (TX Output & RX Input Pins)
±15kV
HBM - Human Body Model (all other pins)
± 3kV
IEC 61000-4-2 Airgap Discharge (TX Output & RX Input Pins)
±15kV
IEC 61000-4-2 Contact Discharge (TX Output & RX Input Pins)
± 8kV
2
SP330E
RS-232/RS-485/RS-422 TRANSCEIVER WITH 1.65V-5.5V INTERFACE
REV. 1.0.1
ELECTRICAL CHARACTERISTICS
UNLESS OTHERWISE NOTED:
VCC = +3.0V to +5.5V, C1-C4 = 0.1µF; TA = TMIN to TMAX. Typical values are at VL = VCC = 3.3V, TA = +25°C.
SYMBOL
PARAMETERS
MIN.
TYP.
MAX.
UNITS
CONDITIONS
1
2.5
mA
No load, Idle inputs,
RS-485/RS-232 = 0V
DC CHARACTERISTICS
ICC
Supply Current (RS-232)
ICC
Supply Current (RS-485/422)
1.8
4.5
mA
No load, Idle inputs,
RS-485/RS-232 = VCC
ICC
Vcc Shutdown Current
0.01
1
µA
SHDN = 0V, Receiver inputs
open or grounded
TRANSMITTER and LOGIC INPUTS (PINS 11 - 14 & 18 - 20)
VL
VIL
Logic Input Voltage Low
VIH
Logic Input Voltage High
IINL
Logic Input Leakage Current
±0.01
±1
µA
IINPD
Logic Input Pulldown Current
10
50
µA
VHYS
Logic Input Hysteresis
200
3
2VL
V
V
3
RE pin 18, VIN = VL
mV
RS-232 and RS-485/422 RECEIVER OUTPUTS (PINS 8 & 9)
VOL
Receiver Output Voltage Low
VOH
Receiver Output Voltage High
IOSS
Receiver Output Short Circuit Current
IOZ
Receiver Output Leakage Current
0.4
VL-0.6
3
V
IOUT = 1.5mA
V
IOUT = -1.5mA
±20
±85
mA
±0.05
±1
µA
0 VO VL
0 VO VL,
Receivers disabled
SP330E
RS-232/RS-485/RS-422 TRANSCEIVER WITH 1.65V-5.5V INTERFACE
REV. 1.0.1
ELECTRICAL CHARACTERISTICS (Continued)
UNLESS OTHERWISE NOTED:
VCC = +3.0V to +5.5V, C1-C4 = 0.1µF; TA = TMIN to TMAX. Typical values are at VCC = 3.3V, TA = +25°C.
SYMBOL
PARAMETERS
MIN.
TYP.
MAX.
UNITS
+15
V
CONDITIONS
RS-232 SINGLE-ENDED RECEIVER INPUTS (PINS 16 & 17)
VIN
Input Voltage Range
VIL
Input Threshold Low
VIH
Input Threshold High
VHYS
Input Hysteresis
RIN
Input Resistance
-15
0.6
1.2
V
VCC = 3.3V
0.8
1.5
V
VCC = 5.0V
1.5
2.0
V
VCC = 3.3V
1.8
2.4
V
VCC = 5.0V
0.5
3
5
V
7
k
-15V VIN +15V
RS-232 SINGLE-ENDED TRANSMITTER OUTPUTS (PINS 6 & 7)
VOUT
Output Voltage Swing
±5.0
±5.5
V
Outputs loaded with 3k to Gnd
ROFF
Output Power Off Impedance
300
10M
VCC = 0V, VOUT = ±2V
ISC
Output Short Circuit Current
IO
Output Leakage Current
±30
4
±60
mA
±125
µA
VOUT = 0V
SHDN = 0V, VOUT = ±9V,
VCC = 0V or 5.5V
SP330E
RS-232/RS-485/RS-422 TRANSCEIVER WITH 1.65V-5.5V INTERFACE
REV. 1.0.1
ELECTRICAL CHARACTERISTICS (Continued)
UNLESS OTHERWISE NOTED:
VCC = +3.0V to +5.5V, C1-C4 = 0.1µF; TA = TMIN to TMAX. Typical values are at VCC = 3.3V, TA = +25°C.
SYMBOL
PARAMETERS
MIN.
TYP.
MAX.
UNITS
CONDITIONS
RS-485/422 DIFFERENTIAL RECEIVER INPUTS (A,B)
RIN
Receiver Input Resistance
IIN
Receiver Input Current
VTH
VTH
Receiver Differential
Threshold Voltage
k
-7V VCM +12V
125
µA
VIN = +12V
-100
µA
VIN = -7V
-50
mV
-7V VCM +12V
96
-200
Receiver Input Hysteresis
-125
25
mV
RS-485/422 DIFFERENTIAL DRIVER OUTPUTS (Y, Z)
VOD
VOD
VCM
VCM
IOSD
IO
Differential Driver Output
1.5
VCC
V
RL = 54 (RS-485), Figure 4
1.5
VCC
V
-7V VCM +12V, Figure 5
2
VCC
V
RL = 100 (RS-422), Figure 4
0.2
V
RL = 54 or 100, Figure 4
3
V
RL = 54 or 100, Figure 4
0.2
V
RL = 54 or 100, Figure 4
±250
mA
-7V VY or VZ +12V, Figure 6
µA
DE = 0V or SHDN = 0V,
VY or VZ = -7V or +12V,
Change In Magnitude of
Differential Output Voltage
Driver Common Mode Output Voltage
Change In Magnitude of
Common Mode Output Voltage
Driver Output Short Circuit Current
Driver Output Leakage Current
±125
VCC = 0V or 5.5V
5
SP330E
RS-232/RS-485/RS-422 TRANSCEIVER WITH 1.65V-5.5V INTERFACE
REV. 1.0.1
TIMING CHARACTERISTICS
UNLESS OTHERWISE NOTED:
VCC = +3.0V to +5.5V, C1-C4 = 0.1µF; TA = TMIN to TMAX. Typical values are at VCC = 3.3V, TA = +25°C.
SYMBOL
PARAMETERS
MIN.
TYP.
MAX.
UNITS
CONDITIONS
ALL MODES
tENABLE
tSHUTDOWN
Enable from Shutdown
1000
ns
Enable to Shutdown
1000
ns
RS-232, DATA RATE = 250kbps (SLEW = 0V), ONE TRANSMITTER SWITCHING
Maximum Data Rate
tRHL, tRLH
Receiver Propagation Delay
tRHL-tRLH
Receiver Propagation Delay Skew
tDHL, tDLH
Driver Propagation Delay
tDHL-tDLH
Driver Propagation Delay Skew
tSHL, tSLH
Transition Region Slew Rate from
+3.0V to -3.0V or -3.0V to +3.0V
tSHL, tSLH
Transition Region Slew Rate from
+3.0V to -3.0V or -3.0V to +3.0V
250
kbps
100
ns
100
1400
600
ns
RL = 3k, CL = 1000pF
CL = 150pF, Figure 7
ns
RL = 3k, CL = 2500pF,
ns
Figure 8
VCC = +3.3V, RL = 3k to 7k,
6
30
V/µs
CL = 150pF to 2500pF,
TA = 25°C, Figure 8
VCC = +3.3V, RL = 3k to 7k,
4
30
V/µs
CL = 150pF to 2500pF,
Figure 8
RS-232, DATA RATE = 1Mbps (SLEW = VCC), ONE TRANSMITTER SWITCHING
Maximum Data Rate
Mbps RL = 3k, CL = 250pF
1
tRHL, tRLH
Receiver Propagation Delay
tRHL-tRLH
Receiver Propagation Delay Skew
tDHL, tDLH
Driver Propagation Delay
tDHL-tDLH
Driver Propagation Delay Skew
tSHL, tSLH
Transition Region Slew Rate from
+3.0V to -3.0V or -3.0V to +3.0V
13
Transition Region Slew Rate from
+3.0V to -3.0V or -3.0V to +3.0V
24
tSHL, tSLH
100
ns
100
300
150
ns
CL = 150pF, Figure 7
ns
RL = 3k, CL = 1000pF,
ns
Figure 8
VCC = +3.3V, RL = 3k to 7k,
150
V/µs
CL = 150pF to 1000pF,
Figure 8
VCC = +3.3V, RL = 3k to 7k,
150
V/µs
CL = 150pF to 1000pF,
TA = 25°C, Figure 8
6
SP330E
RS-232/RS-485/RS-422 TRANSCEIVER WITH 1.65V-5.5V INTERFACE
REV. 1.0.1
TIMING CHARACTERISTICS (Continued)
UNLESS OTHERWISE NOTED:
VCC = +3.0V to +5.5V, C1-C4 = 0.1µF; TA = TMIN to TMAX. Typical values are at VCC = 3.3V, TA = +25°C.
SYMBOL
PARAMETERS
MIN.
TYP.
MAX.
UNITS
CONDITIONS
RS-485/RS-422, DATA RATE = 250kbps (SLEW = 0V), ONE TRANSMITTER SWITCHING
Maximum Data Rate
tRPHL, tRPLH
Receiver Propagation Delay
tRPHL-tRPLH
Receiver Propagation Delay Skew
tDPHL, tDPLH
Driver Propagation Delay
tDPHL-tDPLH
Driver Propagation Delay Skew
tDR, tDF
Driver Rise and Fall Time
250
kbps
50
500
300
650
150
ns
10
ns
1000
ns
100
ns
1200
ns
RL = 54, CL = 50pF
CL = 15pF, Figure 9
RL = 54, CL = 50pF,
Figure 10
tRZH, tRZL
Receiver Output Enable Time
200
ns
tRHZ, tRLZ
Receiver Output Disable Time
200
ns
tDZH, tDZL
Driver Output Enable Time
1000
ns
RL = 500, CL = 50pF,
tDHZ, tDLZ
Driver Output Disable Time
200
ns
Figure 12
CL = 15pF, Figure 11
RS-485/RS-422, DATA RATE = 20Mbps (SLEW = VCC), ONE TRANSMITTER SWITCHING
Maximum Data Rate
tRPHL, tRPLH
Receiver Propagation Delay
tRPHL-tRPLH
Receiver Propagation Delay Skew
tDPHL, tDPLH
Driver Propagation Delay
tDPHL-tDPLH
Driver Propagation Delay Skew
tDR, tDF
Mbps RL = 54, CL = 50pF
20
50
30
10
Driver Rise and Fall Time
150
ns
10
ns
100
ns
10
ns
20
ns
CL = 15pF, Figure 9
RL = 54, CL = 50pF,
Figure 10
tRZH, tRZL
Receiver Output Enable Time
200
ns
tRHZ, tRLZ
Receiver Output Disable Time
200
ns
tDZH, tDZL
Driver Output Enable Time
200
ns
RL = 500, CL = 50pF,
tDHZ, tDLZ
Driver Output Disable Time
200
ns
Figure 12
7
CL = 15pF, Figure 11
SP330E
RS-232/RS-485/RS-422 TRANSCEIVER WITH 1.65V-5.5V INTERFACE
REV. 1.0.1
PIN DESCRIPTIONS
Pin
Name
RS-232
RS-485 Full Duplex
RS-485 Half Duplex
1
C1+
Charge pump cap 1 positive lead, 0.1µF
2
VL
Logic Supply for TTL Inputs and Outputs, VL = +1.65V to +5.5V or tie to VCC
3
VCC
Main Supply, VCC = +3.0V to +5.5V, bypass to ground with 1.0µF
4
C1-
Charge pump cap 1 negative lead
5
GND
Ground
6
T1OUT, B/Z
Transmitter 1 Output
Z Driver Neg Output
B/Z Neg Input/Output
7
T2OUT, A/Y
Transmitter 2 Output
Y Driver Pos Output
A/Y Pos Input/Output
8
R1OUT
Receiver 1 Output
X
X
9
R2OUT, RO
Receiver 2 Output
Receiver TTL Output
Receiver TTL Output
10
11
SHDN
Low power shutdown mode when low
12
SLEW
Data rate limited to 250kbps when low
13
RS-485/RS-232
0
1
1
14
HALF/FULL
X
0
1
15
GND
16
R2IN, A
Receiver 2 Input
A Pos Receiver Input
X
17
R1IN, B
Receiver 1 Input
B Neg Receiver Input
X
18
RE
X
Receiver enabled when low
19
T2IN, DE
Transmitter 2 Input
Driver enabled when high
20
T1IN, DI
Transmitter 1 Input
Driver TTL Input
21
V-
Charge pump negative supply, 0.1µF from ground
22
C2-
Charge pump cap 2 negative lead
23
C2+
Charge pump cap 2 positive lead, 0.1µF
24
V+
Charge pump positive supply, 0.1µF to ground
Ground
8
SP330E
RS-232/RS-485/RS-422 TRANSCEIVER WITH 1.65V-5.5V INTERFACE
REV. 1.0.1
SUGGESTED DB9 CONNECTOR PINOUT
DB9
Pin
RS-232
RS-485
Full Duplex
2
RXD
RX+
3
TXD
TX-
RS-485
Half Duplex
1
Data-
4
5
Ground
6
7
RTS
TX+
8
CTS
RX-
9
9
Data+
SP330E
RS-232/RS-485/RS-422 TRANSCEIVER WITH 1.65V-5.5V INTERFACE
REV. 1.0.1
BLOCK DIAGRAMS
FIGURE 1. RS-232 MODE
V+
C1+
C1
0.1µF
1
VL
Cc
1.0µF
2
VCC
3
24
SP330
C2+
24 pin TSSOP
RS-232
C2-
23
V-
4
21
GND
5
T2OUT
R1OUT
R2OUT
6
7
8
9
C2
0.1µF
22
C1-
T1OUT
C3
0.1µF
20
T1
19
T2
R1
R2
5kΩ
17
5kΩ
16
15
_____
SHDN
11
14
_____
SLEW
______
RS-485/RS-232
12
13
Pin 18 has a 300k internal pull-down (not shown).
10
T2IN
18
GND
10
T1IN
R1IN
R2IN
C4
0.1µF
SP330E
RS-232/RS-485/RS-422 TRANSCEIVER WITH 1.65V-5.5V INTERFACE
REV. 1.0.1
FIGURE 2. RS-485 FULL DUPLEX MODE
C1+
C1
0.1µF
V+
1
VL
SP330
C2+
VCC
24 pin TSSOP
RS-485 Full Duplex
C2-
2
Cc
1.0µF
24
3
23
V-
4
21
D
GND
5
Y
RO
C2
0.1µF
22
C1-
Z
C3
0.1µF
6
20
19
7
18
8
17
R
9
16
GND
10
15
_____
SHDN
____
HALF/FULL
_____
SLEW
______
RS-485/RS-232
11
14
12
13
Pin 18 has a 300k internal pull-down (not shown).
11
DI
DE
__
RE
B
A
C4
0.1µF
SP330E
RS-232/RS-485/RS-422 TRANSCEIVER WITH 1.65V-5.5V INTERFACE
REV. 1.0.1
FIGURE 3. RS-485 HALF DUPLEX MODE
C1+
C1
0.1µF
V+
1
Cc
1.0µF
24
VL
SP330
C2+
VCC
24 pin TSSOP
RS-485 Half Duplex
C2-
2
3
23
V-
4
21
D
GND
5
A/Y
6
RO
20
19
7
8
C2
0.1µF
22
C1-
B/Z
C3
0.1µF
18
R
9
17
16
GND
10
15
_____
SHDN
____
HALF/FULL
_____
SLEW
______
RS-485/RS-232
11
14
12
13
Pin 18 has a 300k internal pull-down (not shown).
12
DI
DE
__
RE
C4
0.1µF
SP330E
RS-232/RS-485/RS-422 TRANSCEIVER WITH 1.65V-5.5V INTERFACE
REV. 1.0.1
TEST CIRCUITS
FIGURE 4. RS-485/422 DIFFERENTIAL DRIVER OUTPUT VOLTAGE
Z
DI = 0V or VL
D
RL
2
VOD
VCM
RL
2
Y
DE = VL
FIGURE 5. RS-485/422 DIFFERENTIAL DRIVER OUTPUT VOLTAGE OVER COMMON MODE
Z
375Ω
DI = 0V or VL
D
VOD
VCM
60Ω
375Ω
Y
DE = VL
FIGURE 6. RS-485/422 DRIVER OUTPUT SHORT CIRCUIT CURRENT
Z
DI = 0V or VL
IOSD
D
-7V to +12V
Y
DE = 0V or VL
13
V
SP330E
RS-232/RS-485/RS-422 TRANSCEIVER WITH 1.65V-5.5V INTERFACE
REV. 1.0.1
FIGURE 7. RS-232 RECEIVER PROPAGATION DELAY
VIN
VOUT
Rx
CL
VIN
+3V
1.5V
1.5V
-3V
tRHL
tRLH
VL
2
VL
2
VOH
VOUT
VOL
FIGURE 8. RS-232 DRIVER PROPAGATION DELAY
VIN
VOUT
Tx
RL
VIN
VL
0V
VL
2
CL
VL
2
tDHL
tDLH
+3V
VOUT
0V
-3V
tSHL
0V
tSLH
14
SP330E
RS-232/RS-485/RS-422 TRANSCEIVER WITH 1.65V-5.5V INTERFACE
REV. 1.0.1
FIGURE 9. RS-485/422 RECEIVER PROPAGATION DELAY
B
RO
R
CL
A
RE = 0V
B
+1V
0V
-1V
A
tRPLH
tRPHL
VOH
VL
2
RO
VL
2
VOL
FIGURE 10. RS-485/422 DRIVER PROPAGATION DELAY AND RISE/FALL TIMES
Z
DI
VOD
D
RL
CL
Y
DE = VL
DI
VL
0V
Z
VL
2
VL
2
tDPLH
tSKEW = |tDPHL – tDPLH|
tDPHL
VOD
Y
VOD
(VY - VZ)
VOD+
0V
VOD-
90%
90%
10%
10%
tDR
15
tDF
SP330E
RS-232/RS-485/RS-422 TRANSCEIVER WITH 1.65V-5.5V INTERFACE
REV. 1.0.1
FIGURE 11. RS-485/422 RECEIVER OUTPUT ENABLE/DISABLE TIMES
B
RO
R
RE
A
RE
VL
0V
VL
2
RL
CL
VL
2
VA = VCC
VB = 0V
tRZH
VOH
tRHZ
VOH
2
RO
0V
VOH - 0.25V
VL
B
RL
RO
R
RE
VL
0V
VA = 0V
VB = VCC
VL
2
VL
2
tRZL
VL
RO
VOL
CL
RE
A
tRLZ
VL + VOL
2
VOL + 0.25V
16
SP330E
RS-232/RS-485/RS-422 TRANSCEIVER WITH 1.65V-5.5V INTERFACE
REV. 1.0.1
FIGURE 12. RS-485/422 DRIVER OUTPUT ENABLE/DISABLE TIMES
Z
Testing Z: DI = 0V
VOUT
D
Testing Y: DI = VL
DE
DE
VL
VL
2
0V
RL
Y
VL
2
tDZH
VOH
VOUT
CL
tDHZ
VOH + VOL
2
VOL
VOH - 0.25V
VCC
Z
RL
Testing Z: DI = VL
VOUT
D
Testing Y: DI = 0V
DE
DE
VL
0V
VL
2
VL
2
tDZL
VOH
VOUT
VOL
CL
Y
tDLZ
VOH + VOL
2
VOL + 0.25V
17
SP330E
RS-232/RS-485/RS-422 TRANSCEIVER WITH 1.65V-5.5V INTERFACE
REV. 1.0.1
PRODUCT SUMMARY
The SP330 is an advanced multiprotocol transceiver supporting RS-232, RS-485, and RS-422 serial
standards. The multiple configuration modes allow all three protocols to be used interchangeably over a single
cable or connector with no additional switching components. Full operation requires only four external charge
pump capacitors.
ENHANCED FAILSAFE
The enhanced failsafe feature of the SP330 guarantees a logic-high receiver output when the receiver inputs
are open, shorted, or terminated but idle/undriven. The enhanced failsafe interprets 0V differential as a logic
high with a minimum 50mV noise margin, while maintaining compliance with the EIA/TIA-485 standard of
±200mV. No external biasing resistors are required, further easing the usage of multiple protocols over a single
connector.
±15kV ESD PROTECTION
ESD protection structures are incorporated on all pins to protect against electrostatic discharges encountered
during handling and assembly. The bus pins (driver outputs and receiver inputs) have extra protection
structures, which have been tested up to ±15kV without damage. These structures withstand high ESD in all
states: normal operation, in shutdown, and when powered off.
ESD protection is be tested in various ways. MaxLinear uses the following methods to qualify the protection
structures designed into SP330:
±8kV using IEC 61000-4-2 Contact Discharge
±15kV using IEC 61000-4-2 Airgap Discharge
±15kV using the Human Body Model (HBM)
The IEC 61000-4-2 standard is more rigorous than HBM, resulting in lower voltage levels compared with HBM
for the same level of ESD protection. Because IEC 61000-4-2 specifies a lower series resistance, the peak
current is higher than HBM. The SP330 has passed both HBM and IEC 61000-4-2 testing without damage.
VARIABLE LOGIC LEVEL VOLTAGE
The SP330 includes a VL pin which reduces the logic level thresholds to interface with processors operating at
reduced supply voltages. This pin should be connected to the supply voltage of the processor or UART block,
or can be connected to VCC for typical logic levels.
18
SP330E
RS-232/RS-485/RS-422 TRANSCEIVER WITH 1.65V-5.5V INTERFACE
REV. 1.0.1
TRUTH TABLES
TABLE 1: RS-232 TX TRUTH TABLE
INPUTS
OUTPUTS
SHDN
RS-485/RS-232
DI/T1IN, DE/T2IN
Z(B)/T1OUT, Y(A)/T2OUT
0
X
X
1/8th unit load
1
0
0
1
1
0
1
0
1
1
X
RS-485 Mode
TABLE 2: RS-232 RX TRUTH TABLE
INPUTS
OUTPUTS
SHDN
RS-485/RS-232
B/R1IN, A/R2IN
R1OUT, RO/R2OUT
X
0
0
1
X
0
1
0
X
0
Inputs open
1
X
1
X
R1OUT High-Z,
RO/R2OUT in RS-485 Mode
19
SP330E
RS-232/RS-485/RS-422 TRANSCEIVER WITH 1.65V-5.5V INTERFACE
REV. 1.0.1
TABLE 3: RS-485/422 TX TRUTH TABLE
INPUTS
OUTPUTS
SHDN
RS-485/RS-232
DE/T2IN
DI/T1IN
Z(B)/T1OUT
Y(A)/T2OUT
0
X
X
X
1/8th unit load
1/8th unit load
1
1
0
X
1/8th unit load
1/8th unit load
1
1
1
0
1
0
1
1
1
1
0
1
X
0
X
X
RS-232 Mode
TABLE 4: RS-485/422 RX TRUTH TABLE
INPUTS
OUTPUT
RS-485/RS-232
SHDN
HALF/FULL
RE
(A-B)
(Y-Z)
RO/R2OUT
1
0
X
X
X
X
High-Z
1
1
0
0
-50mV
X
1
1
1
0
0
-200mV
X
0
1
1
0
0
Floating
X
1
1
1
1
0
X
-50mV
1
1
1
1
0
X
-200mV
0
1
1
1
0
X
Floating
1
1
1
X
1
X
X
High-Z
0
X
X
X
X
X
RS-232 Mode
20
SP330E
RS-232/RS-485/RS-422 TRANSCEIVER WITH 1.65V-5.5V INTERFACE
REV. 1.0.1
MECHANICAL DIMENSIONS
FIGURE 13. TSSOP 24 DRAWING
TOP VIEW
BOTTOM VIEW
SIDE VIEW - 1
©
©
SIDE VIEW - 2
TERMINAL DETAILS
Drawing No.: POD-00000058
Revision: D
21
SP330E
RS-232/RS-485/RS-422 TRANSCEIVER WITH 1.65V-5.5V INTERFACE
RECOMMENDED LAND PATTERN AND STENCIL
FIGURE 14. TSSOP 24
TYPICAL RECOMMENDED LAND PATTERN
TYPICAL RECOMMENDED STENCIL
Drawing No.: POD-00000058
Revision: D
22
REV. 1.0.1
SP330E
RS-232/RS-485/RS-422 TRANSCEIVER WITH 1.65V-5.5V INTERFACE
REV. 1.0.1
REVISION HISTORY
DATE
REVISION
DESCRIPTION
Nov 2013
1.0.0
Production Release
May 2018
1.0.1
Update to MaxLinear logo. Update format and ordering information. Update ESD
protection / ratings table.
Corporate Headquarters:
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Suite 100
San Jose, CA 95131
Carlsbad, CA 92008
Tel.: +1 (669) 265-6100
Tel.:+1 (760) 692-0711
Fax: +1 (669) 265-6101
Fax: +1 (760) 444-8598
Email: serialtechsupport@exar.com
www.maxlinear.com
www.exar.com
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