SP3243E
3 Driver/5 Receiver Intelligent +3.0V to +5.5V
RS-232 Transceivers
FEATURES
■ Meets true EIA/TIA-232-F Standards
from a +3.0V to +5.5V power supply
■ Interoperable with EIA/TIA-232 and
adheres to EIA/TIA-562 down to a +2.7V
power source
■ AUTO ON-LINE
®
circuitry automatically
wakes up from a 1µA shutdown
■ Regulated Charge Pump Yields Stable
RS-232 Outputs Regardless of V
CC
Variations
■ Enhanced ESD Specifications:
+15kV
Human Body Model
+15kV
IEC61000-4-2 Air Discharge
+8kV
IEC61000-4-2 Contact Discharge
■ 250 Kbps min. transmission rate (EB)
■ 1000 Kbps min. transmission rate (EU)
■ Ideal for High Speed RS-232 Applications
C2+ 1
C2- 2
V-
R
1
IN
R
2
IN
R
3
IN
R
4
IN
3
4
5
6
7
SP3243E
28 C1+
27
26
25
24
V+
V
CC
GND
C1-
23 ONLINE
22 SHUTDOWN
21 STATUS
20
19
18
17
16
15
R
2
OUT
R
1
OUT
R
2
OUT
R
3
OUT
R
4
OUT
R
5
OUT
R
5
IN 8
T
1
OUT 9
T
2
OUT 10
T
3
OUT 11
T
3
IN 12
T
2
IN 13
T
1
IN 14
Now Available in Lead Free Packaging
The SP3243E products are 3 driver/5 receiver RS-232 transceiver solutions intended for portable
or hand-held applications such as notebook and palmtop computers. The SP3243E includes one
complementary receiver that remains alert to monitor an external device's Ring Indicate signal while
the device is shutdown. The SP3243E and EB devices feature slew-rate limited outputs for reduced
crosstalk and EMI. The "U" and "H" series are optimized for high speed with data rates up to 1Mbps,
easily meeting the demands of high speed RS-232 applications. The SP3243E series uses an internal
high-efficiency, charge-pump power supply that requires only 0.1µF capacitors in 3.3V operation. This
charge pump and Exar's driver architecture allow the SP3243E series to deliver compliant RS-232
performance from a single power supply ranging from +3.0V to +5.5V. The AUTO ON-LINE
®
feature
allows the device to automatically "wake-up" during a shutdown state when an RS-232 cable is con-
nected and a connected peripheral is turned on. Otherwise, the device automatically shuts itself down
drawing less than 1µA.
Device
Power
Supplies
+3.0V to +5.5V
+3.0V to +5.5V
+3.0V to +5.5V
+3.0V to +5.5V
RS-232
Drivers
3
3
3
3
RS-232
Receivers
5
5
5
5
External
Components
4 Capacitors
4 Capacitors
4 Capacitors
4 Capacitors
Auto
On-Line
Circuitry
Yes
Yes
Yes
Yes
TTL
3-
State
Yes
Yes
Yes
Yes
DESCRIPTION
SELECTION TABLE
# of
Pins
28
28
28
28
Data
Rate
120
250
460
1000
ESD
Rating
15kV
15kV
15kV
15kV
SP3243E
SP3243EB
SP3243EH
SP3243EU
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7017 • www.exar.com
SP3243E_102_060611
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.
V
CC
.......................................................-0.3V to +6.0V
V+ (NOTE 1).......................................-0.3V to +7.0V
V- (NOTE 1)........................................+0.3V to -7.0V
V+ + |V-| (NOTE 1)...........................................+13V
I
CC
(DC V
CC
or GND current).........................+100mA
Input Voltages
TxIN, ONLINE,SHUTDOWN, .....-0.3V to Vcc +6.0V
RxIN...................................................................+15V
Output Voltages
TxOUT.............................................................+13.2V
RxOUT, STATUS.......................-0.3V to (V
CC
+0.3V)
Short-Circuit Duration
TxOUT....................................................Continuous
Storage Temperature......................-65°C to +150°C
NOTE 1: V+ and V- can have maximum magnitudes of
7V, but their absolute difference cannot exceed 13V.
Power Dissipation per package
28-pin SOIC (derate 12.7mW/
o
C above +70
o
C).........1000mW
28-pin SSOP (derate 11.2mW/
o
C above +70
o
C)..........900mW
28-pin TSSOP (derate 13.2mW/
o
C above +70
o
C)......1059mW
32-pin QFN (derate 29.4mW/
o
C above +70
o
C)...........2352mW
Unless otherwise noted, the following specifications apply for V
CC
= +3.0V to +5.5V with T
AMB
= T
MIN
to T
MAX
,
C1 - C4 = 0.1µF.
Typical values apply at V
CC
= +3.3V or +5.0V and T
AMB
= 25°C.
PARAMETER
DC CHARACTERISTICS
Supply Current, AUTO ON-
LINE®
Supply Current, Shutdown
Supply Current
AUTO ON-LINE® Disabled
1.0
10
µA
All RxIN open, ONLINE = GND,
SHUTDOWN = V
CC
, V
CC
= 3.3V
T
AMB
= 25
o
C, TxIN = GND or V
CC
MIN.
TYP.
MAX.
UNITS
CONDITIONS
ELECTRICAL CHARACTERISTICS
1.0
0.3
10
1.0
µA
mA
SHUTDOWN = GND, VCC = 3.3V,
T
AMB
= 25
o
C, TxIN = Vcc or GND
ONLINE = SHUTDOWN = Vcc, no
load, V
CC
= 3.3V, T
AMB
= +25
o
C,
TxIN = GND or V
CC
V
CC
= =3.3V or =5.0V, TxIN
ONLINE, SHUTDOWN
TxIN, ONLINE, SHUTDOWN,
T
AMB
= +25
o
C, V
IN
= 0V to V
CC
Receivers disabled, V
OUT
= 0V to V
CC
I
OUT
= 1.6mA
I
OUT
= -1.0mA
All driver outputs loaded with 3KΩ to
GND, T
AMB
= +25
o
C
LOGIC INPUTS AND RECEIVER OUTPUTS
Input Logic Threshold
LOW
HIGH
Input Leakage Current
Output Leakage Current
Output Voltage LOW
Output Voltage HIGH
DRIVER OUTPUTS
Output Voltage Swing
+5.0
+5.4
V
V
CC
-0.6
V
CC
-0.1
0.8
+0.01
+0.05
+1.0
+10
0.4
V
V
µA
µA
V
V
2.4
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7017 • www.exar.com
SP3243E_102_060611
2
Unless otherwise noted, the following specifications apply for V
CC
= +3.0V to +5.5V with T
AMB
= T
MIN
to T
MAX
,
C1 - C4 = 0.1µF.
Typical values apply at V
CC
= +3.3V or +5.0V and T
AMB
= 25°C.
PARAMETER
DRIVER OUTPUTS (continued)
Output Resistance
Output Short-Circuit Current
Output Leakage Current
RECEIVER INPUTS
Input Voltage Range
Input Threshold LOW
Input Threshold LOW
Input Threshold HIGH
Input Threshold HIGH
Input Hysteresis
Input Resistance
STATUS Output Voltage LOW
STATUS Output Voltage HIGH
Receiver Threshold to Drivers
Enabled (t
ONLINE
)
Receiver Positive or Negative
Threshold to STATUS HIGH (t
STSH
)
Receiver Positive or Negative
Threshold to STATUS LOW (t
STSL
)
TIMING CHARACTERISTICS
Maximum Data Rate (U)
(H)
(B)
(-)
1000
460
250
120
Kbps
V
CC
-0.6
350
0.2
30
3
-15
0.6
0.8
1.2
1.5
1.5
1.8
0.3
5
7
0.4
2.4
2.4
15
V
V
V
V
V
V
kΩ
V
V
µs
µs
µs
I
OUT
= 1.6mA
I
OUT
= -1.0mA
Figure 14
Figure 14
Figure 14
Vcc = 3.3V
Vcc = 5.0V
Vcc = 3.3V
Vcc = 5.0V
300
+35
+60
+25
Ω
mA
µA
MIN.
TYP.
MAX.
UNITS
CONDITIONS
ELECTRICAL CHARACTERISTICS
V
CC
= V+ = V- = 0V, V
OUT
=+2V
V
OUT
= 0V
V
CC
= 0V or 3.0V to 5.5V, V
OUT
=
+12V,
Drivers disabled
AUTO ON-LINE® CIRCUITRY CHARACTERISTICS (ONLINE = GND, SHUTDOWN = VCC) 25°C
R
L
= 3KΩ, C
L
= 250pF, one driver
active
R
L
= 3KΩ, C
L
= 1000pF, one
driver active
R
L
= 3KΩ, C
L
= 1000pF, one
driver active
R
L
= 3KΩ, C
L
= 1000pF, one
driver active
Receiver Propagation Delay
t
PHL
t
PLH
Receiver Output Enable Time
Receiver Output Disable Time
Driver Skew (E, EB)
(EH, EU)
Receiver Skew
Transition-Region Slew Rate
(EH, EU)
(E, EB)
0.15
0.15
200
200
100
50
50
500
100
µs
ns
ns
ns
ns
Receiver input to Receiver out-
put, C
L
= 150pF
Normal operation
Normal operation
| t
PHL
- t
PLH
|
| t
PHL
- t
PLH
|
Vcc = 3.3V, R
L
= 3kΩ, T
AMB
=
25°C, measurements taken from
-3.0V to +3.0V or +3.0V to -3.0V
SP3243E_102_060611
6
90
30
V/µs
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7017 • www.exar.com
3
TYPICAL PERFORMANCE CHARACTERISTICS
Unless otherwise noted, the following performance characteristics apply for V
CC
= +3.3V, 1000kbps data rate, all
drivers loaded with 3kΩ, 0.1µF charge pump capacitors, and T
AMB
= +25°C.
200
150
Skew (ns)
100
50
0
T1 at 500Kbps
T2 at 31.2Kbps
All TX loaded 3K // CLoad
6
4
Transmitter Output
Voltage (V)
2
0
-2
-4
-6
2.7
3
3.5
4
Supply V oltage (V)
4.5
5
1Driver at 1Mbps
Other Drivers at 62.5Kbps
All Drive rs Loaded with 3K // 250pF
0
250
500
1000
1500
Load Capacitance (pF)
2000
Figure 1. Transmitter Skew VS. Load Capacitance
Figure 2. Transmitter Output Voltage VS. Supply
Voltage for the SP3243EU
6
Transmitter
Output V oltage (V)
40
2Mbps
1.5Mbps
4
2
0
-2
-4
-6
0
35
Supply Current (mA)
1Mbps
30
25
20
15
10
5
0
0
1000
250Kbps
120Kbps
20Kbps
1 TX at full data rate
2 TX’s at1/16 data rate
2Mbps
1.5Mbps
1Mbps
1 Transmi tter at full Data Rate
2 Transmi tters at 1 5.5 Kbps
All Transmi tters loa des 3K + Load Cap
250
500
1000
1500
Load Capacitance (pF)
2000
2000
3000
4000
5000
Load Capacitance (pF)
Figure 3. Transmitter Output Voltage VS. Load
Capacitance for the SP3243EU
Figure 4. Supply Current VS. Load Capacitance for
the SP3243EU
25
20
Supply Current (mA)
6
4
Transmitter Output
Voltage (V)
TxOUT +
15
10
5
0
2
0
-2
-4
-6
0
TxOUT -
1 Transmitter at 250Kbps
2 Transmitters at 15.6Kbps
All drivers loaded with 3K // 1000pF
2.7
3
3.5
4
4.5
5
1000
2000
3000
4000
5000
Supply V oltage (V
DC
)
Load Capacitance (pF)
Figure 5. Supply Current VS. Supply Voltage for the
SP3243EU
Figure 6. Transmitter Output Voltage VS. Load
Capacitance for the SP3243EB
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7017 • www.exar.com
SP3243E_102_060611
4
Unless otherwise noted, the following performance characteristics apply for V
CC
= +3.3V, 1000kbps data rate, all
drivers loaded with 3kΩ, 0.1µF charge pump capacitors, and T
AMB
= +25°C.
TYPICAL PERFORMANCE CHARACTERISTICS
25
20
15
10
5
0
0
1 Transmitter at 250Kbps
2 Transmitter at 15.6Kbps
All drivers loaded 3K + Load Cap
- Slew
+ Slew
Slew Rate (V/µs)
500
1000
2000
3000
4000
5000
Load Capacitance (pF)
Figure 7. Slew Rate VS. Load Capacitance
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7017 • www.exar.com
SP3243E_102_060611
5
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