SP385E
Enhanced +3V or +5V RS-232 Line Driver/Receiver
FEATURES
N/C 1
18
ON/OFF
C1+
2
17
VCC
V+
3
16
GND
C1-
4
15
T 1 OUT
C2+
5
14
R 1 IN
C 2-
6
13
R 1 OUT
V-
7
12
T 1 IN
T2 OUT 8
11
T 2 IN
9
10
R 2 OUT
R2 IN
SP385E
■ Operates from 3.3V or 5V Power Supply
■ Meets all EIA-232D and V.28 Specifications at 5V.
■ Meets EIA-562 Specifications at 3.3V
■ Two Drivers and Receivers
■ Operates with 0.1µF to 10µF Capacitors
■ High data rate - 120kbps Under Load
■ Low Power Shutdown ≤ 1µA
■ 3-State TTL/CMOS Receiver Outputs
■ Low Power CMOS - 5mA Operation
■ Improved ESD Specifications:
+15kV Human Body Model
+15kV IEC61000-4-2 Air Discharge
+8kV IEC61000-4-2 Contact Discharge
Now Available in Lead Free Packaging
DESCRIPTION
Exar's SP385E is an enhanced version of the SP200 family of RS-232 line drivers/receivers. The
SP385E offers +3.3V operation for EIA-562 and EIA-232 applications. The SP385E features offered
maintains the same performance features offered in its predecessors. The SP385E is available in
plastic SOIC or SSOP packages operating over the commercial and industrial temperature ranges.
The SP385E is pin compatible to the LTC1385 EIA-562 transceiver with the exception that the drivers
are disabled with the ON/OFF pin.
TYPICAL APPLICATION CIRCUIT
RS232 OUTPUTS
Charge
Pump
RS232 INPUTS
T2
T1
R1
TTL/CMOS INPUTS
R2
TTL/CMOS OUTPUTS
SP385E_101_012920
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 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.
Power Dissipation
VCC................................................................... +6.0V
V+ .............................................(Vcc-0.3V) to +13.2V
V- .................................................................... -13.2V
20-pin SSOP ..................................................750mW
(derate 9.25mW/°C above +70 °C)
Input Voltages
TxIN, .......................................-0.3V to (Vcc + 0.3V)
RxIN...................................................................+15V
Output Voltages
TxOUT.................................(V+, +0.3V) to (V-, -0.3V)
RxOUT........................................-0.3V to (VCC +0.3V)
Short-Circuit Duration
TxOUT....................................................Continuous
Storage Temperature......................-65°C to +150°C
18-pin Wide SOIC.........................................1260mW
(derate 15.7mW/°C above +70 °C)
ELECTRICAL CHARACTERISTICS
VCC = +3.3V +10%; cap on (V+) and (V-) = 1.0µF, C1 = C2 = 0.1µF; TMIN to TMAX unless otherwise noted.
PARAMETER
MIN.
TYP.
MAX.
UNITS
CONDITIONS
0.8
V
TxIN, ON/OFF, Vcc = 3.3V
V
TxIN, ON/OFF, Vcc = 3.3V
µA
TIN = 0V
TTL INPUT
Input Logic Threshold LOW
Input Logic Threshold HIGH
2.0
Logic Pullup Current
Maximum Data Rate
15
200
120
kbps
CL = 2500pF, RL = 3kΩ
TTL OUTPUT
TTL/CMOS Output
Voltage LOW
TTL/CMOS Output
Voltage HIGH
0.5
2.4
Leakage Current
+0.05
+10
V
IOUT = 3.2mA, Vcc = 3.3V
V
IOUT = -1.0mA
µA
ON/OFF = 0V, 0V ≤ VOUT ≤ Vcc,
TA = 25°C
V
All transmitter outputs loaded with
3kΩ to GND
EIA-562 OUTPUT
Output Voltage Swing
+3.7
+4.2
SP385E_101_012920
2
ELECTRICAL CHARACTERISTICS
VCC = +3.3V +10%; cap on (V+) and (V-) = 1.0µF, C1 = C2 = 0.1µF; TMIN to TMAX unless otherwise noted.
PARAMETER
MIN.
TYP.
MAX.
UNITS
CONDITIONS
EIA-562 OUTPUT (continued)
Power-Off Output Resistance
300
Output Short-Circuit Current
Ω
+10
mA
VCC = 0V, VOUT=+2V
Infinite Duration
EIA-562 INPUT
Input Voltage Range
-15
Input Threshold LOW
0.8
Input Threshold HIGH
15
1.2
1.7
2.4
V
V
VCC = 3.3V, TA = +25°C
V
VCC = 3.3V, TA = +25°C
Input Hysteresis
0.2
0.5
1.0
V
VCC = 3.3V, TA = +25°C
Input Resistance
3
5
7
kΩ
VIN = 15V to -15V
µs
TTL to RS-562
µs
RS-562 to TTL
DYNAMIC CHARACTERISTICS
Driver Propagation Delay
4.0
Receiver Propagation Delay
1.5
Instantaneous Slew Rate
30
V/µs
Transition-Region Slew Rate
10
V/µs
Output Enable Time
300
ns
Output Disable Time
1000
ns
CL = 10pF, RL = 3kΩ - 7kΩ:
TA = +25°C
CL = 2500pF, RL = 3kΩ;
Measured from +2V to -2V or -2V
to +2V
POWER REQUIREMENTS
Vcc Power Supply Current
3
Vcc Power Supply Current
Shutdown Supply Current
0.01
6
mA
No load, TA = +25°C; Vcc = 3.3V
8
mA
All transmitters RL = 3kΩ,
TA = +25°C
5
µA
Vcc = 3.3V, TA = +25°C
SP385E_101_012920
3
ELECTRICAL CHARACTERISTICS
VCC = +3.3V +10%; cap on (V+) and (V-) = 1.0µF, C1 = C2 = 0.1µF; TMIN to TMAX unless otherwise noted.
PARAMETER
MIN.
TYP.
MAX.
UNITS
CONDITIONS
0.8
V
TxIN, ON/OFF
V
TxIN, ON/OFF
200
µA
TIN = 0V
TTL INPUT
Input Logic Threshold LOW
Input Logic Threshold HIGH
2.0
Logic Pullup Current
Maximum Data Rate
15
120
kbps
CL = 2500pF, RL = 3kΩ
TTL OUTPUT
TTL/CMOS Output
Voltage LOW
TTL/CMOS Output
Voltage HIGH
0.4
3.5
Leakage Current
+0.05
+10
V
IOUT = 3.2mA, Vcc = 5.0V
V
IOUT = -1.0mA, Vcc = 5.0V
µA
ON/OFF = 0V, 0V ≤ VOUT ≤ Vcc,
TA = 25°C
V
All transmitter outputs loaded with
3kΩ to GND
Ω
VCC = 0V, VOUT=+2V
EIA-232 OUTPUT
Output Voltage Swing
+5.0
Power-Off Output Resistance
300
Output Short-Circuit Current
+9
+18
mA
Infinite Duration
EIA-232 INPUT
Input Voltage Range
-15
Input Threshold LOW
0.8
Input Threshold HIGH
15
1.2
1.7
2.4
V
V
VCC = 5V, TA = +25°C
V
VCC = 5V, TA = +25°C
Input Hysteresis
0.2
0.5
1.0
V
VCC = 5V, TA = +25°C
Input Resistance
3
5
7
kΩ
VIN = 15V to -15V
µs
RS-232 to TTL
30
V/µs
DYNAMIC CHARACTERISTICS
Propagation Delay
1.5
Instantaneous Slew Rate
Transition-Region Slew Rate
10
V/µs
Output Enable Time
400
ns
Output Disable Time
250
ns
CL = 10pF, RL = 3kΩ - 7kΩ:
TA = +25°C
CL = 2500pF, RL = 3kΩ;
Measured from +3V to -3V or -3V
to +3V
POWER REQUIREMENTS
Vcc Power Supply Current
10
Vcc Power Supply Current
25
Shutdown Supply Current
1
15
10
mA
No load, TA = +25°C; Vcc = 5V
mA
All transmitters RL = 3kΩ, TA = +25°C
µA
Vcc = 5V, TA = +25°C
SP385E_101_012920
4
TYPICAL PERFORMANCE CHARACTERISTICS
-11
12
-10
10
V– Voltage (V olts)
-9
8
V+ (Volts)
-8
VCC = 5V
-7
-6
2
-4
-3
VCC = 4V
4
VCC = 4V
-5
VCC = 5V
6
0
2
4
6
8
10
12
0
14
0
Load Current (mA)
5
10
15
25
20
30
35
40
Load Current (mA)
30
8.4
8.2
25
8.0
VCC = 5V
VOH (Volts)
ICC (mA)
20
15
10
VCC = 4V
7.8
7.6
Load current = 0mA
TA = 25 C
7.4
7.2
5
VCC = 3V
0
-55
-40
7.0
0
25
70
85
6.8
4.5
125
4.75
5.0
5.25
5.5
VCC (Volts)
Temperature ( C)
PINOUT
1
18
ON/OFF
N/C
1
20
ON/OFF
C1+
2
17
VCC
C1+
2
19
VCC
V+
3
16
GND
15
14
4
5
C 2-
6
V-
7
V+
3
18
GND
T 1 OUT
C 1-
4
17
T 1 OUT
R 1 IN
C2+
5
16
R 1 IN
13
R 1 OUT
C 2-
6
15
R 1 OUT
12
T 1 IN
V-
7
14
T 1 IN
T2 IN
T2 OUT
8
11
R2 IN
9
10
T 2 IN
R 2 OUT
SP385E
C1 C2+
SP385E
N/C
T2 OUT
8
13
R 2 IN
9
12
R 2 OUT
N/C 10
11
N/C
18-pin WSOIC
20-pin SSOP
SP385E_101_012920
5
TYPICAL OPERATING CIRCUIT
+5V INPUT
10µF
+5V to +10V
Voltage Doubler
+10V to -10V
Voltage Inverter
V+
V-
1.0µF
16V
3+
7
+
2
0.1µF +
6.3V
4
5
0.1µF +
16V
6
1.0µF
16V
R1OUT
13
2
8
14
R
1
T2 OUT
R1 IN
5kΩ
R 2OUT
10
9
R
2
5kΩ
SP385E
18
R2IN
INPUTS
T
TTL/CMOS
11
OUTPUTS
400kΩ
T IN
2
C
+
V
+5V to +10V
Voltage Doubler
+10V to -10V
Voltage Inverter
1.0µF
16V
3+
V+
V-
7
+ 1.0µF
16V
400kΩ
T1OUT
TTL/CMOS
15
RS232
1
OUTPUTS
T
RS232
T1 IN
INPUTS
INPUTS
OUTPUTS
TTL/CMOS
TTL/CMOS
400kΩ
12
19
C
+
T1 IN
14
T
1
T1OUT
400kΩ
T IN
2
R1OUT
13
T
15
R
1
12
R
2
2
8
16
T2 OUT
R1 IN
5kΩ
R 2OUT
9
5kΩ
ON/OFF
SP385E
GND 16
17
20
R2IN
RS232
C
+
V
OUTPUTS
17
C
+
+
RS232
2
0.1µF +
6.3V
4
5
0.1µF +
16V
6
+5V INPUT
+
INPUTS
10µF
ON/OFF
GND 18
SOIC Package
SSOP Package
SP385E_101_012920
6
FEATURES
The Exar SP385E is a +3V or +5V EIA-232/
EIA-562 line transceiver. It is a pin-for-pin
alternative for the SP310A and will operate in
the same socket with capacitors ranging from
0.1µF to 10µF, either polarized or non–polarized, in +3V supplies. The SP385E offers the
same features such as 120kbps guaranteed
transmission rate, increased drive current for
longer and more flexible cable configurations,
low power dissipation and overall ruggedized
construction for commercial and industrial
environments. The SP385E also includes a
shutdown feature that tri-states the drivers and
the receivers.
Driver/Transmitter
The drivers are inverting transmitters, which
accept TTL or CMOS inputs and output the
RS-232 signals with an inverted sense relative
to the input logic levels. Typically the RS-232
output voltage swing is ±9V for 5V supply and
±4.2V for 3.3V supply. Even under worst case
loading conditions of 3kΩ and 2500pF, the
output is guaranteed to be ±5V for a 5V supply
and ±3.7V for a 3.3V supply which adheres to
EIA-232 and EIA-562 specifications, respectively. The transmitter outputs are protected
against infinite short-circuits to ground without
degradation in reliability.
The instantaneous slew rate of the transmitter output is internally limited to a maximum
of 30V/µs in order to meet the standards [EIA
232-D 2.1.7, Paragraph (5)]. However, the
transition region slew rate of these enhanced
products is typically 10V/µs. The smooth transition of the loaded output from VOL to VOH
clearly meets the monotonicity requirements of
the standard [EIA 232-D 2.1.7, Paragraphs (1)
& (2)].
The SP385E includes a charge pump voltage
converter which allows it to operate from a
single +3.3V or +5V supply. These converters double the VCC voltage input in order to
generate the EIA-232 or EIA-562 output levels.
For +5V operation, the SP385E driver outputs adhere to all EIA-232D and CCITT V.28
specifications. While at +3.3V operation, the
outputs adhere to EIA-562 specifications. Due
to Exar's efficient charge pump design, the
charge pump levels and the driver outputs are
less noisy than other 3V EIA-232 transceivers.
Receivers
The receivers convert RS-232 input signals to
inverted TTL signals. Since the 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 500mV. This ensures that the
receiver is virtually immune to noisy transmission lines.
The SP385E has a single control line which
simultaneously shuts down the internal DC/DC
converter and puts all transmitter and receiver
outputs into a high impedance state.
The SP385E is available in 18-pin plastic
SOIC and 20-pin plastic SSOP packages
for operation over commercial and industrial
temperature ranges. Please consult the factory
for surface-mount packaged parts supplied on
tape-on-reel as well as parts screened to MILM-38510.
The input thresholds are 0.8V minimum and
2.4V maximum, again well within the ±3V RS232 requirements. The receiver inputs are also
protected against voltages up to ±15V. Should
an input be left unconnected, a 5kΩ pull-down
resistor to ground will commit the output of the
receiver to a high state.
The SP385E is ideal for +3.3V battery applications requiring low power operation. The
charge pump strength allows the drivers to
provide ±4.0V signals, plenty for typical EIA232 applications since the EIA-232 receivers
have input sensitivity levels of less than ±3V.
In actual system applications, it is quite possible for signals to be applied to the receiver
inputs before power is applied to the receiver
circuitry. This occurs for example when a PC
user attempts to print only to realize the printer
wasn’t turned on. In this case an RS-232 signal
from the PC will appear on the receiver input
at the printer. When the printer power is turned
on, the receiver will operate normally. All of
these enhanced devices are fully protected.
THEORY OF OPERATION
The SP385E device is made up of three basic
circuit blocks — 1) a driver/transmitter, 2) a
receiver and 3) a charge pump.
SP385E_101_012920
7
Charge Pump
The charge pump is a Exar–patented design
(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 10V power
supplies. There is a free–running oscillator
that controls the four phases of the voltage
shifting. A description of each phase follows.
Phase 4
— VDD transfer — The fourth phase of the
clock connects the negative terminal of C2
to ground, and transfers the generated l0V
across C2 to C4, the VDD storage capacitor.
Again, simultaneously with this, the positive
side of capacitor C1 is switched to +5V and
the negative side is connected to ground, and
the cycle begins again.
Phase 1
— VSS charge storage —During this phase of
the clock cycle, the positive side of capacitors
C1 and C2 are initially charged to +5V. Cl+
is then switched to ground and the charge in
C1– is transferred to C2–. Since C2+ is connected to +5V, the voltage potential across
capacitor C2 is now 10V.
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.
The clock rate for the charge pump typically
operates at 15kHz. The external capacitors
can be as low as 0.1µF with a 16V breakdown
voltage rating.
Phase 2
— VSS transfer — Phase two of the clock connects the negative terminal of C2 to the VSS
storage capacitor and the positive terminal of
C2 to ground, and transfers the generated
–l0V to C3. Simultaneously, the positive side of
capacitor C 1 is switched to +5V and the negative side is connected to ground.
Phase 3
— VDD charge storage — The third phase of
the clock is identical to the first phase — the
charge transferred in C1 produces –5V in the
negative terminal of C1, which is applied to the
negative side of capacitor C2. Since C2+ is at
+5V, the voltage potential across C2 is l0V.
a) C2+
b) C2–
+10V
GND
GND
–10V
Figure 1. Charge Pump Waveform
SP385E_101_012920
8
VCC = +5V
C4
+5V
+
C1
+
C2
–
–5V
+
–
–
–
VDD Storage Capacitor
+
VSS Storage Capacitor
C3
–5V
Figure 2. Charge Pump — Phase 1
VCC = +5V
C4
+
C1
C2
–
+
–
+
–
–
+
VDD Storage Capacitor
VSS Storage Capacitor
C3
-10V
Figure 3. Charge Pump — Phase 2
VCC = +5V
C4
+5V
C1
+
–
C2
–5V
+
+
–
–
–
VDD Storage Capacitor
+
VSS Storage Capacitor
C3
–5V
Figure 4. Charge Pump — Phase 3
VCC = +5V
+10V
C1
+
–
C2
C4
+
–
+
–
–
+
VDD Storage Capacitor
VSS Storage Capacitor
C3
Figure 5. Charge Pump — Phase 4
Shutdown (ON/OFF)
The SP385E has a shut-down/standby mode
to conserve power in battery-powered systems.
To activate the shutdown mode, which stops
the operation of the charge pump, a logic "0" is
applied to the appropriate control line. The shutdown mode is controlled on the SP385E by a
logic "0" on the ON/OFF control line (pin 18 for
the SOIC and pin 20 for the SSOP packages);
this puts the transmitter outputs in a tri-state
mode.
SP385E_101_012920
9
ESD TOLERANCE
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 7. There
are two methods within IEC61000-4-2, the Air
Discharge method and the Contact Discharge
method.
The SP385E device 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.
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.
There are different methods of ESD testing applied:
a) MIL-STD-883, Method 3015.7
b) IEC61000-4-2 Air-Discharge
c) IEC61000-4-2 Direct Contact
The Human Body Model has been the generally
accepted ESD testing method for semi-conductors. 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 6. 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.
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.
The IEC-61000-4-2, formerly IEC801-2, is generally used for testing ESD on equipment and
systems. For system manufacturers, they 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
RS
RC
SW1
DC Power
Source
SW2
CS
Device
Under
Test
Figure 6. ESD Test Circuit for Human Body Model
SP385E_101_012920
10
Contact-Discharge Model
RS
RC
RV
SW1
SW2
Device
Under
Test
CS
DC Power
Source
R S and RV add up to 330Ω for IEC61000-4-2.
Figure 7. ESD Test Circuit for IEC61000-4-2
I→
The circuit models in Figures 6 and 7 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.
30A
15A
0A
For the Human Body Model, the current limiting
resistor (RS) and the source capacitor (CS) are
1.5kΩ an 100pF, respectively. For IEC-61000-4-2,
the current limiting resistor (RS) and the source capacitor (CS) are 330Ω an 150pF, respectively.
t = 0ns
t→
t = 30ns
Figure 8. ESD Test Waveform for IEC61000-4-2
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.
DEVICE PIN
TESTED
Driver Outputs
Receiver Inputs
HUMAN BODY
MODEL
Air Discharge
+15kV
+15kV
+15kV
+15kV
IEC61000-4-2
Direct Contact
Level
+8kV
+8kV
4
4
Table 1. Transceiver ESD Tolerance Levels
SP385E_101_012920
11
PACKAGE: 20 PIN SSOP
SP385E_101_012920
12
PACKAGE: 18 PIN WSOIC
18 pin WSOIC version is obsolete
SP385E_101_012920
13
ORDERING INFORMATION(1), (3)
Part Number
Temp. Range
Package
Packaging Method
Lead-Free(2)
SP385ECA-L/TR
0°C to +70°C
20 Pin SSOP
Tape and Reel
Yes
SP385EEA-L/TR
-40°C to +85°C
20 Pin SSOP
Tape and Reel
Yes
NOTES:
1. Refer to www.maxlinear.com/SP385E for most up to date Ordering Information.
2. Visit www.maxlinear.com for additional information on Environmental Rating.
3. 18-pin WSOIC version is obsolete.
SP385E_101_012920
14
REVISION HISTORY
DATE
REVISION DESCRIPTION
03/08/05
--
Legacy Sipex Datasheet
03/08/11
1.0.0
Convert to Exar Format, update ordering information and
change ESD specification to IEC61000-4-2
01/29/20
1.0.1
Update to MaxLinear logo. Update ordering information.
MaxLinear, Inc.
5966 La Place Court, Suite 100
Carlsbad, CA 92008
760.692.0711 p.
760.444.8598 f.
www.maxlinear.com
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