SP3222EB / SP3232EB
Data Sheet
True +3.0V to +5.5V RS-232 Transceivers
General Description
Features
The SP3222EB and SP3232EB series are RS-232
transceiver solutions intended for portable or hand-held
applications such as notebook or laptop computers. The
SP3222EB / SP3232EB series has a high-efficiency,
charge-pump power supply that requires only 0.1µF
capacitors in 3.3V operation. This charge pump allows the
SP3222EB / SP3232EB series to deliver true RS-232
performance from a single power supply ranging from
3.0V to 5.5V. The SP3222EB / SP3232EB are 2-driver /
2-receiver devices. The ESD tolerance of the SP3222EB /
SP3232E devices is over ±15kV for both Human Body
Model and IEC61000-4-2 Air discharge test methods. The
SP3222EB device has a low-power shutdown mode
where the devices’ driver outputs and charge pumps are
disabled. During shutdown, the supply current falls to less
than 1µA.
■
■
■
■
■
Meets true EIA / TIA-232-F standards from a 3.0V to
5.5V power supply
250kbps transmission rate under load
1μA low power shutdown with receivers active
(SP3222EB)
Interoperable with RS-232 down to a 2.7V power source
Enhanced ESD specifications:
±15kV Human Body Model
±15kV IEC61000-4-2 Air Discharge
±8kV IEC61000-4-2 Contact Discharge
Ordering Information - page 18
Selection Table
Table 1: Selection Table
Power Supplies
RS-232
Drivers
RS-232
Receivers
External
Components
Shutdown
TTL
3-State
# of Pins
SP3222EB
3.0V to 5.5V
2
2
4 Capacitors
Yes
Yes
20
SP3232EB
3.0V to 5.5V
2
2
4 Capacitors
No
No
16
Device
3
C1-
4
17
C2+
5
SP3222EB 16
C2-
6
15 R1OUT
V-
7
14
18 GND
16 VCC
R1IN
C2+
4
C2-
5
12 R1OUT
N.C.
V-
6
11 T1IN
5
14 T1OUT
SP3232EB 13 R1IN
8
13 T1IN
T2OUT
7
10
9
12 T2IN
R2IN
8
9
SSOP / TSSOP
T2IN
R2OUT
C2-
3
V-
4
SP3232EB
SSOP / NSOIC / TSSOP
12 T1OUT
11 R1IN
10 R1OUT
9
6
7
8
N.C.
Figure 1: SP3222EB and SP3232EB Pinouts
• www.maxlinear.com•
1
C2+ 2
3
R2IN
11
C1-
C1-
T2OUT
R2OUT 10
16 15 14 13
15 GND
T1OUT
T2OUT
R2IN
V+ 2
V CC
C1+ 1
V+
T2IN
19 VCC
R2OUT
C1+ 2
GND
20 SHDN
1
V+
EN
C1+
Pinouts
QFN
T1IN
SP3222EB / SP3232EB True +3.0V to +5.5V RS-232 Transceivers Data Sheet
Revision History
Revision History
Revision
Release Date
--
11/2/05
Legacy Sipex Datasheet
1.0.0
9/9/09
Convert to Exar Format. Update ordering information and change revision to 1.0.0.
1.0.1
6/7/11
Remove obsolete devices per PDN 110510-01 and change ESD rating to IEC-61000-4-2.
1.0.2
3/14/13
Correct ype error to RX input voltage range and TX transition region slew rate condition.
1.0.3
8/14/14
Add Max Junction temperature and package thermal information.
1.0.4
5/28/15
Update Absolute Max Rating for RxIN input voltage to ±25V, update logo.
1.0.5
10/27/15
Add SP3232EBER (QFN 16) preliminary package option.
1.0.6
2/23/16
Remove preliminary status of QFN 16 package option.
1.0.7
1/24/20
Update to MaxLinear template and logo. Update Ordering Information. Remove obsolete
WSOIC references. Move ESD tolerance levels to new ESD Ratings section located on
page 1.
1.0.8
October 19, 2021
205-32xxEBDSR00
Change Description
Updated:
■
’"Slew Rate vs Load Capacitance" figure.
ii
Rev 1.0.8
SP3222EB / SP3232EB True +3.0V to +5.5V RS-232 Transceivers Data Sheet
Table of Contents
Table of Contents
General Description............................................................................................................................................. i
Features................................................................................................................................................................ i
Selection Table..................................................................................................................................................... i
Pinouts.................................................................................................................................................................. i
Specifications ..................................................................................................................................................... 1
Absolute Maximum Ratings...........................................................................................................................................1
ESD Ratings ..................................................................................................................................................................1
Operating Conditions.....................................................................................................................................................2
Electrical Characteristics ...............................................................................................................................................2
Typical Performance Characteristics................................................................................................................ 4
Pin Information ................................................................................................................................................... 5
Pin Configurations .........................................................................................................................................................5
Pin Descriptions ............................................................................................................................................................5
Typical Operating Circuits ................................................................................................................................. 6
Description .......................................................................................................................................................... 7
Theory of Operation ......................................................................................................................................................7
Drivers ..................................................................................................................................................................7
Receivers .............................................................................................................................................................8
Charge Pump .......................................................................................................................................................8
ESD Tolerance ...................................................................................................................................................10
Mechanical Dimensions ................................................................................................................................... 12
SSOP20 ......................................................................................................................................................................12
SSOP16 ......................................................................................................................................................................13
TSSOP16 ....................................................................................................................................................................15
TSSOP20 ....................................................................................................................................................................16
QFN16 5x5 ..................................................................................................................................................................17
Ordering Information........................................................................................................................................ 18
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Rev 1.0.8
SP3222EB / SP3232EB True +3.0V to +5.5V RS-232 Transceivers Data Sheet
List of Figures
List of Figures
Figure 1: SP3222EB and SP3232EB Pinouts ....................................................................................................... i
Figure 2: Transmitter Output Voltage vs. Load Capacitance................................................................................ 4
Figure 3: Slew Rate vs. Load Capacitance........................................................................................................... 4
Figure 4: Supply Current vs. Load Capacitance When Transmitting Data ........................................................... 4
Figure 5: Supply Current vs. Supply Voltage........................................................................................................ 4
Figure 6: Transmitter Output Voltage vs. Supply Voltage..................................................................................... 4
Figure 7: Pinout Configurations for the SP3222EB and SP3232EB..................................................................... 5
Figure 8: SP3222EB Typical Operating Circuit..................................................................................................... 6
Figure 9: SP3232EB Typical Operating Circuit..................................................................................................... 6
Figure 10: SP3222EB / SP3232EB Driver Loopback Test Circuit ........................................................................ 7
Figure 11: Loopback Test Results at 120kbps ..................................................................................................... 7
Figure 12: Loopback Test Results at 250kbps ..................................................................................................... 8
Figure 13: Charge Pump — Phase 1.................................................................................................................... 9
Figure 14: Charge Pump — Phase 2.................................................................................................................... 9
Figure 15: Charge Pump Waveforms ................................................................................................................... 9
Figure 16: Charge Pump — Phase 3.................................................................................................................... 9
Figure 17: Charge Pump — Phase 4.................................................................................................................... 9
Figure 18: ESD Test Circuit for Human Body Model .......................................................................................... 10
Figure 19: ESD Test Circuit for IEC61000-4-2 ................................................................................................... 10
Figure 20: ESD Test Waveform for IEC61000-4-2 ............................................................................................. 11
Figure 21: Mechanical Dimensions, SSOP20..................................................................................................... 12
Figure 22: Mechanical Dimensions, SSOP16..................................................................................................... 13
Figure 23: Mechanical Dimensions, NSOIC16 ................................................................................................... 14
Figure 24: Mechanical Dimensions, TSSOP16 .................................................................................................. 15
Figure 25: Mechanical Dimensions, TSSOP20 .................................................................................................. 16
Figure 26: Mechanical Dimensions, QFN16 5x5 ................................................................................................ 17
205-32xxEBDSR00
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Rev 1.0.8
SP3222EB / SP3232EB True +3.0V to +5.5V RS-232 Transceivers Data Sheet
List of Tables
List of Tables
Table 1: Selection Table ........................................................................................................................................ i
Table 1: Absolute Maximum Ratings .................................................................................................................... 1
Table 2: ESD Ratings ........................................................................................................................................... 1
Table 3: Operating Conditions .............................................................................................................................. 2
Table 4: Electrical Characteristics ...................................................................................................................... 2
Table 5: Pin Descriptions...................................................................................................................................... 5
Table 6: SP3222EB Truth Table Logic for Shutdown and Enable Control ........................................................... 8
Table 7: Ordering Information............................................................................................................................. 18
205-32xxEBDSR00
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Rev 1.0.8
SP3222EB / SP3232EB True +3.0V to +5.5V RS-232 Transceivers Data Sheet
Specifications
Specifications
Absolute Maximum Ratings
Important: 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 and cause permanent damage to the device.
Table 1: Absolute Maximum Ratings
Parameter
Minimum
Maximum
Units
VCC
–0.3
6.0
V
V+(1)
–0.3
7.0
V
V-(1)
–7.0
0.3
V
13
V
–100
100
mA
TxIN, EN
–0.3
6.0
V
RxIN
–25
25
V
TxOUT
–13.2
13.2
V
RxOUT
–0.3
VCC + 0.3
V
V+ + |V-|(1)
ICC (DC VCC or GND current)
Input Voltages
Output Voltages
Short-Circuit Duration
TxOUT
Continuous
Temperature
Storage temperature
-65
150
°C
1. V+ and V- can have maximum magnitudes of 7V, but their absolute difference cannot exceed 13V.
2. Driver input hysteresis is typically 250mV.
ESD Ratings
Table 2: ESD Ratings
Parameter
HBM (Human Body Model), driver outputs and receiver inputs
Value
Units
±15
kV
IEC61000-4-2 Air Discharge, driver outputs and receiver inputs
Level 4
±15
kV
IEC61000-4-2 Contact Discharge, driver outputs and receiver inputs
Level 4
±8
kV
205-32xxEBDSR00
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Rev 1.0.8
SP3222EB / SP3232EB True +3.0V to +5.5V RS-232 Transceivers Data Sheet
Operating Conditions
Operating Conditions
Table 3: Operating Conditions
Parameter
Value
Units
125
°C
20-pin SSOP (derate 9.25mW/°C above 70°C)
750
mW
20-pin TSSOP (derate 11.1mW/°C above 70°C)
890
mW
16-pin SSOP (derate 9.69mW/°C above 70°C)
775
mW
16-pin TSSOP (derate 10.5mW/°C above 70°C)
850
mW
16-pin NSOIC (derate 13.57mW/°C above 70°C)
1086
mW
16-pin TSSOP ѲJA
100.4
°C/W
16-pin TSSOP ѲJC
19.0
°C/W
16-pin QFN ѲJA
44.0
°C/W
16-pin QFN ѲJC
7.3
°C/W
Temperature
Maximum junction temperature
Power Dissipation Per Package
Thermal Resistance
Electrical Characteristics
Unless otherwise noted, the following specifications apply for VCC = 3.0V to 5.5V with TAMB = TMIN to TMAX,
C1 - C4 = 0.1µF.
Table 4:
Electrical Characteristics
Parameter
Test Condition
Minimum
Typical
Maximum
Units
DC Characteristics
Supply current
No load, VCC = 3.3V, TAMB= 25°C,
TxIN = GND or VCC
0.3
1.0
mA
Shutdown supply current
SHDN = GND, VCC = 3.3V, TAMB= 25°C,
TxIN = VCC or GND
1.0
10
µA
GND
0.8
V
Logic Inputs and Receiver Outputs
Input logic threshold LOW
TxIN, EN, SHDN(1)
Input logic threshold HIGH
VCC = 3.3V(1)
2.0
VCC
V
Input logic threshold HIGH
VCC = 5.0V(1)
2.4
VCC
V
Input leakage current
TxIN, EN, SHDN, TAMB= 25°C, VIN = 0V to VCC
±0.01
±1.0
µA
Output leakage current
Receivers disabled, VOUT = 0V to VCC
±0.05
±10
µA
Output voltage LOW
IOUT = 1.6mA
0.4
V
Output voltage HIGH
IOUT = –1.0mA
VCC - 0.6 VCC - 0.1
V
Driver Outputs
205-32xxEBDSR00
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Rev 1.0.8
SP3222EB / SP3232EB True +3.0V to +5.5V RS-232 Transceivers Data Sheet
Electrical Characteristics
Table 4: (Continued) Electrical Characteristics
Parameter
Test Condition
Minimum
Typical
Output voltage swing
All driver outputs loaded with 3kΩ to GND,
TAMB= 25°C
±5.0
±5.4
Output resistance
VCC = V+ = V- = 0V, to VOUT = ±2V
300
Output Short-circuit current
VOUT = 0V
Output leakage current
VCC = 0V or 3.0V to 5.5V, VOUT = ±12V, drivers
disabled
Maximum
Units
V
Ω
±35
±60
mA
±25
µA
15
V
Receiver Inputs
Input voltage range
–15
Input threshold LOW
VCC = 3.3V
0.6
1.2
V
Input threshold LOW
VCC = 5.0V
0.8
1.5
V
Input threshold HIGH
VCC = 3.3V
1.5
2.4
V
Input threshold HIGH
VCC = 5.0V
1.8
2.4
V
Input hysteresis
0.3
Input resistance
3
5
V
7
kΩ
Timing Characteristics
Maximum data rate
RL = 3kΩ, CL = 1000pF, one driver active
Receiver propagation delay, tPHL
Receiver input to receiver output, CL = 150pF
0.15
µs
Receiver propagation delay, tPLH
Receiver input to receiver output, CL = 150pF
0.15
µs
Receiver output enable time
200
ns
Receiver output disable time
200
ns
250
kbps
Driver skew
|tPHL- tPLH|, TAMB= 25°C
100
ns
Receiver skew
|tPHL- tPLH|
50
ns
Transition-region slew rate
VCC = 3.3V, RL = 3kΩ, CL = 1000pF,
TAMB= 25°C, measurements taken from –3.0V
to +3.0V or +3.0V to –3.0V
30
V/µs
1. Driver input hysteresis is typically 250mV.
205-32xxEBDSR00
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Rev 1.0.8
SP3222EB / SP3232EB True +3.0V to +5.5V RS-232 Transceivers
Typical Performance Characteristics
Typical Performance Characteristics
14
6
12
4
Slew Rate [V/s]
TxOUT+
Transmitter Output
Voltage (V)
2
T1 at 250Kbps
0
T2 at 15.6Kbps
All TX loaded 3K // CLoad
-2
8
6
4
+Slew
-Slew
TxOUT -
-4
-6
10
2
0
0
1000
2000
3000
4000
0
5000
500
00
2000
2330
Load Capacitance [pF]
Load Capacitance (pF)
Figure 3: Slew Rate vs. Load Capacitance
Figure 2: Transmitter Output Voltage
vs. Load Capacitance
35
16
T1 at Full Data Rate
T2 at 1/16 Data Rate
14
250Kbps
Supply Current (mA)
30
Supply Current (mA)
00
All TX loaded 3K // CLoad
25
20
125Kbps
15
20Kbps
10
5
12
10
8
6
1 Transmitter at 250Kbps
4
1 Transmitter at 15.6Kbps
All transmitters loaded with 3K // 1000pf
2
0
0
1000
2000
3000
4000
0
5000
2.7
3
Load Capacitance (pF)
3.5
4
4.5
5
Supply Voltage (V)
Figure 4: Supply Current vs. Load Capacitance
When Transmitting Data
Figure 5: Supply Current vs. Supply Voltage
6
TxOUT+
Transmitter Output
Voltage (V)
4
2
T1 at 250Kbps
T2 at 15.6Kbps
0
All TX loaded 3K // 1000 pF
-2
-4
-6
TxOUT -
2.7
3
3.5
4
4.5
5
Supply Voltage (V)
Figure 6: Transmitter Output Voltage vs. Supply Voltage
205-32xxEBDSR00
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Rev 1.0.8
SP3222EB / SP3232EB True +3.0V to +5.5V RS-232 Transceivers Data Sheet
Pin Information
Pin Information
18 GND
C1-
4
17
C2+
5
SP3222EB 16
C2-
6
15 R1OUT
V-
7
14
T2OUT
R2IN
V+ 2
15 GND
16 15 14 13
C1- 1
C2+ 2
T1OUT
C1-
3
R1IN
C2+
4
C2-
5
12 R1OUT
N.C.
V-
6
11 T1IN
5
8
13 T1IN
T2OUT
7
10
9
12 T2IN
R2IN
8
9
R2OUT 10
11
14 T1OUT
SP3232EB 13 R1IN
C2-
3
V-
4
SP3232EB
12 T1OUT
11 R1IN
10 R1OUT
9
T2IN
R2OUT
6
7
8
T2IN
3
16 VCC
T2OUT
R2IN
V+
C1+ 1
R2OUT
19 VCC
V+
C1+ 2
V CC
20 SHDN
1
C1+
EN
GND
Pin Configurations
T1IN
N.C.
SSOP / NSOIC / TSSOP
SSOP / TSSOP
QFN
Figure 7: Pinout Configurations for the SP3222EB and SP3232EB
Pin Descriptions
Table 5: Pin Descriptions
Pin Number
Pin
Name
Function / Description
EN
SP3222EB
SP3232EB
SSOP
TSSOP
SSOP
TSSOP
NSOIC
QFN
Receiver enable. Apply logic LOW for normal operation.
Apply logic HIGH to disable the receiver outputs (high-Z state).
1
-
-
C1+
Positive terminal of the voltage doubler charge-pump capacitor.
2
1
15
V+
5.5V output generated by the charge pump.
3
2
16
C1-
Negative terminal of the voltage doubler charge-pump capacitor.
4
3
1
C2+
Positive terminal of the inverting charge-pump capacitor.
5
4
2
C2-
Negative terminal of the inverting charge-pump capacitor.
6
5
3
V-
–5.5V output generated by the charge pump.
7
6
4
T1OUT
RS-232 driver output.
17
14
12
T2OUT
RS-232 driver output.
8
7
5
R1IN
RS-232 receiver input.
16
13
11
R2IN
RS-232 receiver input.
9
8
6
R1OUT
TTL / CMOS receiver output.
15
12
10
205-32xxEBDSR00
5
Rev 1.0.8
SP3222EB / SP3232EB True +3.0V to +5.5V RS-232 Transceivers
Typical Operating Circuits
Table 5: Pin Descriptions
Pin Number
Pin
Name
Function / Description
R2OUT
SP3222EB
SP3232EB
SSOP
TSSOP
SSOP
TSSOP
NSOIC
QFN
TTL / CMOS receiver output.
10
9
7
T1IN
TTL / CMOS driver input.
13
11
9
T2IN
TTL / CMOS driver input.
12
10
8
GND
Ground.
18
15
13
VCC
3.0V to 5.5V supply voltage.
19
16
14
SHDN
Shutdown control Input. Drive HIGH for normal device operation.
Drive LOW to shutdown the drivers (high-Z output) and the on-board
power supply.
20
-
-
N. C.
No connect.
11, 14
-
-
Typical Operating Circuits
V CC
V CC
C5
C1
C2
LOGIC
INPUTS
+
+
0.1μF
2 C1+
0.1μ F
19
V CC
C5
V+
*C3
4 C15 C2+
+
0.1μF
6 C2-
SP3222EB
SSOP
TSSOP
V-
13 T1IN
T1OUT
12 T2IN
T2OUT
R1IN
17
8
R2IN
0.1μF
C1
+
1 C1+
0.1μF
+
0.1μF
C2
LOGIC
INPUTS
RS-232
OUTPUTS
9
+
0.1μF
16
V CC
V+
*C3
SP3232EB
LOGIC
OUTPUTS
C4
11 T1IN
T1OUT
14
10 T2IN
T2OUT
7
0.1μF
13
R2IN
8
+
0.1μF
RS-232
OUTPUTS
RS-232
INPUTS
5k Ω
SHDN
GND
18
R1IN
5k Ω
9 R2OUT
+
6
5 C2-
5kΩ
1 EN
V-
12 R1OUT
RS-232
INPUTS
2
3 C14 C2+
16
5kΩ
10 R2OUT
+
0.1μF
7
C4
15 R1OUT
LOGIC
OUTPUTS
3
+
20
GND
15
*can be returned to
either V CC or GND
*can be retur ned to
either V CC or GND
Figure 9: SP3232EB Typical Operating Circuit
Figure 8: SP3222EB Typical Operating Circuit
.
205-32xxEBDSR00
6
Rev 1.0.8
SP3222EB / SP3232EB True +3.0V to +5.5V RS-232 Transceivers
Description
Description
Figure 10 shows a loopback test circuit used to test the
RS-232 Drivers. Figure 11 shows the test results of the
loopback circuit with all drivers active at 120kbps with RS232 loads in parallel with a 1000pF capacitor. Figure 12
shows the test results where one driver was active at
250kbps and all drivers loaded with an RS-232 receiver in
parallel with 1000pF capacitors. A solid RS-232 data
transmission rate of 250kbps provides compatibility with
many designs in personal computer peripherals and LAN
applications.
The SP3222EB / SP3232EB transceivers meet the
EIA / TIA-232 and ITU-T V.28/V.24 communication
protocols and can be implemented in battery-powered,
portable, or hand-held applications such as notebook or
palmtop computers. The SP3222EB / SP3232EB devices
feature MaxLinear’s proprietary on-board charge pump
circuitry that generates ±5.5V for RS-232 voltage levels
from a single 3.0V to 5.5V power supply. This series is ideal
for 3.3V-only systems, mixed 3.3V to 5.5V systems, or
5.0V-only systems that require true RS-232 performance.
The SP3222EB / SP3232EB devices can operate at a data
rate of 250kbps when fully loaded.
VCC
The SP3222EB and SP3232EB are 2-driver / 2-receiver
devices ideal for portable or hand-held applications. The
SP3222EB features a 1µA shutdown mode that reduces
power consumption and extends battery life in portable
systems. Its receivers remain active in shutdown mode,
allowing external devices such as modems to be monitored
using only 1µA supply current.
C5
C1
+
+
0.1μF
VCC
C1+
V+
+
0.1μF
0.1μF
C3
C1-
C2
+
C2+
0.1μF
SP3222EB
SP3232EB
VC4
C2-
Theory of Operation
LOGIC
INPUTS
The SP3222EB/SP3232EB series is made up of three
basic circuit blocks:
LOGIC
OUTPUTS
1. Drivers
+
0.1μF
TxOUT
TxIN
RxIN
RxOUT
5kΩ
EN*
*SHDN
2. Receivers
VCC
GND
3. The MaxLinear proprietary charge pump
1000pF
Drivers
* SP3222EB only
Figure 10: SP3222EB / SP3232EB
Driver Loopback Test Circuit
The drivers are inverting level transmitters that convert TTL
or CMOS logic levels to 5.0V EIA / TIA-232 levels with an
inverted sense relative to the input logic levels. Typically,
the RS-232 output voltage swing is ±5.4V with no load and
±5V minimum fully loaded. The driver outputs are
protected against infinite short-circuits to ground without
degradation in reliability. Driver outputs will meet
EIA / TIA-562 levels of ±3.7V with supply voltages as low
as 2.7V.
The drivers can guarantee a data rate of 250kbps fully
loaded with 3kΩ in parallel with 1000pF, ensuring
compatibility with PC-to-PC communication software.
The slew rate of the driver is internally limited to a
maximum of 30V/µs in order to meet the EIA standards
(EIA RS-232D 2.1.7, Paragraph 5). The transition of the
loaded output from HIGH to LOW also meet the
monotonicity requirements of the standard.
205-32xxEBDSR00
Figure 11: Loopback Test Results at 120kbps
7
Rev 1.0.8
SP3222EB / SP3232EB True +3.0V to +5.5V RS-232 Transceivers
Theory of Operation
Since receiver input is usually from a transmission line
where long cable lengths and system interference can
degrade the signal, the inputs have a typical hysteresis
margin of 300mV. This ensures that the receiver is virtually
immune to noisy transmission lines. Should an input be left
unconnected, an internal 5kΩ pulldown resistor to ground
will commit the output of the receiver to a HIGH state.
Charge Pump
The charge pump is an MaxLinear-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 5.5V power supplies. The
internal power supply consists of a regulated dual charge
pump that provides output voltages of ±5.5V regardless of
the input voltage (VCC) over the 3.0V to 5.5V range.
Figure 12: Loopback Test Results at 250kbps
The SP3222EB driver’s output stages are turned off (tristate) when the device is in shutdown mode. When the
power is off, the SP3222EB device permits the outputs to
be driven up to ±12V. The driver’s inputs do not have pullup resistors. Designers should connect unused inputs to
VCC or GND.
In most circumstances, decoupling the power supply can
be achieved adequately using a 0.1µF bypass capacitor at
C5 (refer to Figure 8 and Figure 9).
In applications that are sensitive to power-supply noise,
decouple VCC to ground with a capacitor of the same value
as charge-pump capacitor C1. Physically connect bypass
capacitors as close to the IC as possible.
In the shutdown mode, the supply current falls to less than
1µA, where SHDN = LOW. When the SP3222EB device is
shut down, the device’s driver outputs are disabled (tristated) and the charge pumps are turned off with V+ pulled
down to VCC and V- pulled to GND. The time required to
exit shutdown is typically 100µs. Connect SHDN to VCC if
the shutdown mode is not used.
The charge pump operates in a discontinuous mode using
an internal oscillator. If the output voltages are less than a
magnitude of 5.5V, the charge pump is enabled. If the
output voltages exceed a magnitude of 5.5V, the charge
pump is disabled. This oscillator controls the four phases
of the voltage shifting. A description of each phase follows.
Receivers
Phase 1: VSS charge storage
The receivers convert EIA / TIA-232 levels to TTL or CMOS
logic output levels. The SP3222EB receivers have an
inverting tri-state output. These receiver outputs (RxOUT)
are tri-stated when the enable control EN = HIGH. In the
shutdown mode, the receivers can be active or inactive. EN
has no effect on TxOUT. The truth table logic of the
SP3222EB driver and receiver outputs can be found in
Table 6.
During this phase of the clock cycle, the positive side of
capacitors C1 and C2 are initially charged to VCC. Cl+ is
then switched to GND and the charge in C1– is transferred
to C2–. Since C2+ is connected to VCC, the voltage
potential across capacitor C2 is now 2 times VCC.
Phase 2: VSS transfer
Table 6: SP3222EB Truth Table Logic
for Shutdown and Enable Control
SHDN
EN
TxOUT
RxOUT
0
0
Tri-state
Active
0
1
Tri-state
Tri-state
1
0
Active
Active
1
1
Active
Tri-state
205-32xxEBDSR00
Phase two of the clock connects the negative terminal of C2
to the VSS storage capacitor and the positive terminal of C2
to GND. This transfers a negative generated voltage to C3.
This generated voltage is regulated to a minimum voltage
of –5.5V. Simultaneous with the transfer of the voltage to
C3, the positive side of capacitor C1 is switched to VCC and
the negative side is connected to GND.
8
Rev 1.0.8
SP3222EB / SP3232EB True +3.0V to +5.5V RS-232 Transceivers
Theory of Operation
Phase 3: VDD charge storage
[
The third phase of the clock is identical to the first phase;
the charge transferred in C1 produces –VCC in the negative
terminal of C1, which is applied to the negative side of
T
]
+6V
a) C2+
+
capacitor C2. Since C2 is at VCC, the voltage potential
across C2 is 2 times VCC.
T
GND 1
GND 2
Phase 4: VDD transfer
b) C2-
The fourth phase of the clock connects the negative
terminal of C2 to GND, and transfers this positive
generated voltage across C2 to C4, the VDD storage
capacitor. This voltage is regulated to 5.5V. At this voltage,
the internal oscillator is disabled. Simultaneous with the
transfer of the voltage to C4, the positive side of capacitor
C1 is switched to VCC and the negative side is connected to
GND, allowing the charge pump cycle to begin again. The
charge pump cycle will continue as long as the
operational conditions for the internal oscillator are
present.
T
-6V
Ch1 2.00V Ch2 2.00V M 1.00μs Ch1 5.48V
Figure 15: Charge Pump Waveforms
VCC = +5V
+5V
C1
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.
+
C2
–
–5V
C4
+
–
–
+
+
–
VDD Storage Capacitor
VSS Storage Capacitor
C3
–5V
Figure 16: Charge Pump — Phase 3
The clock rate for the charge pump typically operates at
greater than 250kHz. The external capacitors can be as
low as 0.1µF with a 16V breakdown voltage rating.
VCC = +5V
+5.5V
C1
VCC = +5V
+
–
C2
C4
+
–
–
+
+
–
VDD Storage Capacitor
VSS Storage Capacitor
C3
+5V
C1
+
C2
–
–5V
C4
+
–
–
+
+
–
VDD Storage Capacitor
Figure 17: Charge Pump — Phase 4
VSS Storage Capacitor
C3
–5V
Figure 13: Charge Pump — Phase 1
VCC = +5V
C4
C1
+
–
C2
+
–
–
+
+
–
-5.5V
VDD Storage Capacitor
VSS Storage Capacitor
C3
Figure 14: Charge Pump — Phase 2
205-32xxEBDSR00
9
Rev 1.0.8
SP3222EB / SP3232EB True +3.0V to +5.5V RS-232 Transceivers
Theory of Operation
ESD Tolerance
The SP3222EB / SP3232EB Series incorporates
ruggedized ESD cells on all driver output and receiver input
pins. The ESD structure is improved over our previous
family for more rugged applications and environments
sensitive to electro-static discharges and associated
transients. The improved ESD tolerance is at least ±15kV
without damage nor latch-up.
Contact-Discharge Model
RS
RC
SW1
DC Power
Source
RV
SW2
Device
Under
Test
CS
There are different methods of ESD testing applied:
a. MIL-STD-883, Method 3015.7
R S and RV add up to 330Ω for IEC61000-4-2.
b. IEC61000-4-2 Air-Discharge
c. IEC61000-4-2 Direct Contact
Figure 19: ESD Test Circuit for IEC61000-4-2
The Human Body Model has been the generally accepted
ESD testing method for semiconductors. This method is
also specified in MIL-STD-883, Method 3015.7 for ESD
testing. The premise of this ESD test is to simulate the
human body’s potential to store electro-static energy and
discharge it to an integrated circuit. The simulation is
performed by using a test model as shown in Figure 18.
This method will test the IC’s capability to withstand an
ESD transient during normal handling such as in
manufacturing areas where the IC’s tend to be handled
frequently.
RS
RC
SW1
DC Power
Source
With the Air Discharge Method, an ESD voltage is applied
to the equipment under test (EUT) through air. This
simulates an electrically charged person ready to connect a
cable onto the rear of the system only to find an unpleasant
zap just before the person touches the back panel. The
high energy potential on the person discharges through an
arcing path to the rear panel of the system before he or she
even touches the system. This energy, whether discharged
directly or through air, is predominantly a function of the
discharge current rather than the discharge voltage.
Variables with an air discharge such as approach speed of
the object carrying the ESD potential to the system and
humidity will tend to change the discharge current. For
example, the rise time of the discharge current varies with
the approach speed.
SW2
CS
The Contact Discharge Method applies the ESD current
directly to the EUT. This method was devised to reduce the
unpredictability of the ESD arc. The discharge current rise
time is constant since the energy is directly transferred
without the air-gap arc. In situations such as hand held
systems, the ESD charge can be directly discharged to the
equipment from a person already holding the equipment.
The current is transferred on to the keypad or the serial port
of the equipment directly and then travels through the PCB
and finally to the IC.
Device
Under
Test
Figure 18: ESD Test Circuit for Human Body Model
The IEC61000-4-2, formerly IEC801-2, is generally used
for testing ESD on equipment and systems. System
manufacturers must guarantee a certain amount of ESD
protection since the system itself is exposed to the outside
environment and human presence. The premise with
IEC61000-4-2 is that the system is required to withstand an
amount of static electricity when ESD is applied to points
and surfaces of the equipment that are accessible to
personnel during normal usage. The transceiver IC
receives most of the ESD current when the ESD source is
applied to the connector pins. The test circuit for
IEC61000-4-2 is shown on Figure 19. There are two
methods within IEC61000-4-2, the Air Discharge method
and the Contact Discharge method.
205-32xxEBDSR00
The circuit model in Figure 18 and Figure 19 represent the
typical ESD testing circuit used for all three methods. The
CS is initially charged with the DC power supply when the
first switch (SW1) is on. Now that the capacitor is charged,
the second switch (SW2) is on while SW1 switches off.The
voltage stored in the capacitor is then applied through RS,
the current limiting resistor, onto the device under test
(DUT). In ESD tests, the SW2 switch is pulsed so that the
device under test receives a duration of voltage.
10
Rev 1.0.8
SP3222EB / SP3232EB True +3.0V to +5.5V RS-232 Transceivers
I→
For the Human Body Model, the current limiting resistor
(RS) and the source capacitor (CS) are 1.5kΩ and 100pF,
respectively. For IEC-61000-4-2, the current limiting
resistor (RS) and the source capacitor (CS) are 330Ω and
150pF, respectively.
Theory of Operation
30A
The higher CS value and lower RS value in the
IEC61000-4-2 model are more stringent than the Human
Body Model. The larger storage capacitor injects a higher
voltage to the test point when SW2 is switched on. The
lower current limiting resistor increases the current charge
onto the test point.
15A
0A
t = 0ns
t→
t = 30ns
Figure 20: ESD Test Waveform for IEC61000-4-2
205-32xxEBDSR00
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Rev 1.0.8
SP3222EB / SP3232EB True +3.0V to +5.5V RS-232 Transceivers Data Sheet
Mechanical Dimensions
Mechanical Dimensions
SSOP20
Top View
Front View
Side View
Drawing No:
POD-00000119
Revision:
A
Figure 21: Mechanical Dimensions, SSOP20
205-32xxEBDSR00
12
Rev 1.0.8
SP3222EB / SP3232EB True +3.0V to +5.5V RS-232 Transceivers Data Sheet
SSOP16
SSOP16
Top View
Side View
Front View
Drawing No:
POD-00000116
Revision:
A
Figure 22: Mechanical Dimensions, SSOP16
205-32xxEBDSR00
13
Rev 1.0.8
SP3222EB / SP3232EB True +3.0V to +5.5V RS-232 Transceivers Data Sheet
SSOP16
NSOIC16
Top View
Front View
Side View
Drawing No:
POD-00000114
Revision:
A
Figure 23: Mechanical Dimensions, NSOIC16
205-32xxEBDSR00
14
Rev 1.0.8
SP3222EB / SP3232EB True +3.0V to +5.5V RS-232 Transceivers Data Sheet
TSSOP16
TSSOP16
Top View
Front View
Side View
POD-00000117
Drawing No:
Revision:
A
Figure 24: Mechanical Dimensions, TSSOP16
205-32xxEBDSR00
15
Rev 1.0.8
SP3222EB / SP3232EB True +3.0V to +5.5V RS-232 Transceivers Data Sheet
TSSOP20
TSSOP20
Top View
Side View
Front View
Drawing No:
POD-00000120
Revision:
A
Figure 25: Mechanical Dimensions, TSSOP20
205-32xxEBDSR00
16
Rev 1.0.8
SP3222EB / SP3232EB True +3.0V to +5.5V RS-232 Transceivers Data Sheet
QFN16 5x5
QFN16 5x5
Figure 26: Mechanical Dimensions, QFN16 5x5
205-32xxEBDSR00
17
Rev 1.0.8
SP3222EB / SP3232EB True +3.0V to +5.5V RS-232 Transceivers Data Sheet
Ordering Information
Ordering Information
Table 7: Ordering Information
Ordering Part Number
Operating Temperature Range
Package
Packaging Method
Lead-Free
SP3222EBEA-L/TR
–40°C to 85°C
20 Pin SSOP
Reel
Yes
SP3222EBEY-L/TR
–40°C to 85°C
20 Pin TSSOP
Reel
Yes
SP3232EBCA-L/TR
0°C to 70°C
16 Pin SSOP
Reel
Yes
SP3232EBCN-L
0°C to 70°C
16-pin NSOIC
Tube
Yes
SP3232EBCN-L/TR
0°C to 70°C
16-pin NSOIC
Reel
Yes
SP3232EBCY-L/TR
0°C to 70°C
16 Pin TSSOP
Reel
Yes
SP3232EBEA-L/TR
–40°C to 85°C
16 Pin SSOP
Reel
Yes
SP3232EBEN-L/TR
–40°C to 85°C
16-pin NSOIC
Reel
Yes
SP3232EBEY-L/TR
–40°C to 85°C
16 Pin TSSOP
Reel
Yes
SP3232EBER-L/TR
–40°C to 85°C
16 Pin QFN
Reel
Yes
SP3222EB
SP3232EB
Note: For most up-to-date ordering information or additional information on environment rating, go to
www.maxlinear.com/SP3222EB and www.maxlinear.com/SP3232EB.
205-32xxEBDSR00
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Rev 1.0.8
SP3222EB / SP3232EB True +3.0V to +5.5V RS-232 Transceivers Data Sheet
Disclaimer
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