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SP3238E
Intelligent +3.0V to +5.5V RS-232 Transceiver
■
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
■
Minimum 250Kbps data rate under load
■
Regulated Charge Pump Yields Stable
RS-232 Outputs Regardless of V
CC
Variations
■
Enhanced ESD Specifications:
+15KV Human Body Model
+15KV IEC1000-4-2 Air Discharge
+8KV IEC1000-4-2 Contact Discharge
C2+ 1
GND 2
C2- 3
V- 4
T1OUT 5
T2OUT 6
T3OUT 7
R1IN 8
R2IN 9
T4OUT 10
R3IN 11
T5OUT 12
ONLINE 13
SHUTDOWN 14
SP3238E
28 C1+
27
26
25
V+
V
CC
C1-
24 T1IN
23 T2IN
22 T3IN
21 R1OUT
20
R2OUT
19 T4IN
18
17
16
R3OUT
T5IN
R1OUT
15 STATUS
Now Available in Lead Free Packaging
DESCRIPTION
The SP3238E device is an RS-232 transceiver solution intended for portable or hand-held
applications such as notebook and palmtop computers. The SP3238E uses an internal
high-efficiency, charge-pump power supply that requires only 0.1µF capacitors in 3.3V
operation. This charge pump and Sipex's driver architecture allow the SP3238E device to
deliver compliant RS-232 performance from a single power supply ranging from +3.0V to
+5.0V. The SP3238E is a 5-driver/3-receiver device, ideal for laptop/notebook computer and
PDA applications. The SP3238E includes one complementary receiver that remains alert to
monitor an external device's Ring Indicate signal while the device is shutdown.
The
AUTO ON-LINE
®
feature allows the device to automatically "wake-up" during a shutdown
state when an RS-232 cable is connected and a connected peripheral is turned on. Otherwise,
the device automatically shuts itself down drawing less than 1µA.
SELECTION TABLE
Device
Power Supplies
RS-232
Drivers
1
2
3
5
RS-232
Receivers
1
2
5
3
External
Components
4 capacitors
4 capacitors
4 capacitors
4 capacitors
AUTO ON-LINE
®
TTL 3-State
Circuitry
NO
YES
YES
YES
YES
YES
YES
YES
No. of
Pins
16
20
28
28
SP3220E
SP3223E
SP3243E
SP3238E
+3.0V to +5.5V
+3.0V to +5.5V
+3.0V to +5.5V
+3.0V to +5.5V
Applicable U.S. Patents - 5,306,954; and other patents pending.
Date: 03/04/05
SP3238E Intelligent +3.0V to +5.5V RS-232 Transceiver
© Copyright 2005 Sipex Corporation
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 +V
CC
+ 0.3V
RxIN...................................................................+25V
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
Power Dissipation per package
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)...............1100mW
Note 1: V+ and V- can have maximum magnitudes of 7V, but their absolute difference cannot exceed 13V.
ELECTRICAL CHARACTERISTICS
V
CC
= +3.0 to +5.5, C1 -C4 = 0.1µF (tested at 3.3V + 5%), C1-C4 = 0.22µF (tested at 3.3V + 10%), C1 = 0.047µF, and C2-C4 = 0.33µF (tested at 5.0V
+ 10%), T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETER
DC CHARACTERISTICS
Supply Current, AUTO ON-LINE
®
MIN.
TYP.
MAX.
UNITS
CONDITIONS
1.0
10
µA
All RxIN open, ONLINE = GND,
SHUTDOWN = V
CC
, all TxIN=GND
or V
CC
SHUTDOWN=GND, all TxIN=GND
or V
CC
ONLINE = SHUTDOWN = V
CC
,
no load, all TxIN=GND or V
CC
Supply Current, Shutdown
Supply Current, AUTO ON-LINE
®
Disabled
LOGIC INPUTS AND RECEIVER OUTPUTS
Input Logic Threshold
LOW
HIGH
Input Leakage Current
Output Leakage Current
Output Voltage LOW
Output Voltage HIGH
V
CC
- 0.6
1.0
0.3
10
1.0
µA
mA
0.8
2.4
+0.01
+0.05
+1.0
+10
0.4
V
CC
- 0.1
V
µA
µA
V
V
V
CC
= +3.3V or +5.0V, TxIN
ONLINE, SHUTDOWN
TxIN, ONLINE, SHUTDOWN
T
A
= 25° C
Receivers Disabled
I
OUT
= 1.6mA
I
OUT
= -1.0mA
Date: 03/04/05
SP3238E Intelligent +3.0V to +5.5V RS-232 Transceiver
© Copyright 2005 Sipex Corporation
2
ELECTRICAL CHARACTERISTICS
V
CC
= +3.0 to +5.5, C1 -C4 = 0.1µF (tested at 3.3V + 5%), C1-C4 = 0.22µF (tested at 3.3V + 10%), C1 = 0.047µF, and C2-C4 = 0.33µF (tested at 5.0V
+ 10%), T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETER
DRIVER OUTPUTS
Output Voltage Swing
Output Resistance
Output Short-Circuit Current
RECEIVER INPUTS
Input Voltage Range
Input Threshold LOW
Input Threshold LOW
Input Threshold HIGH
Input Threshold HIGH
Input Hysteresis
Input Resistance
MIN.
TYP.
MAX.
UNITS
CONDITIONS
±5.0
30 0
±5. 4
V
Ω
All driver outputs loaded with 3 K
Ω
to GND
V
CC
= V+ = V- = 0V, V
OUT
= ±2V
V
OUT
= GND
±35
±6 0
mA
-25
0.6
0.8
1.2
1.5
1.5
1.8
0. 5
3
5
25
V
V
V
V
CC
= 3.3V
V
CC
= 5.0V
V
CC
= 3.3V
V
CC
= 5.0V
2.4
2.4
V
V
V
7
kΩ
AUTO ON-LINE
®
CIRCUITRY CHARACTERISTICS (ONLINE = GND, SHUTDOWN = V
CC
)
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
)
V
CC
- 0.6
200
0.5
0.4
V
V
µS
µS
I
OUT
= 1.6mA
I
OUT
= -1.0mA
Figure 10
Figure 10
20
µS
Figure 10
Date: 03/04/05
SP3238E Intelligent +3.0V to +5.5V RS-232 Transceiver
© Copyright 2005 Sipex Corporation
3
ELECTRICAL CHARACTERISTICS
V
CC
= +3.0 to +5.5, C1 -C4 = 0.1µF (tested at 3.3V + 5%), C1-C4 = 0.22µF (tested at 3.3V + 10%), C1 = 0.047µF, and C2-C4 = 0.33µF (tested at 5.0V
+ 10%), T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETER
TIMING CHARACTERISTICS
Maximum Data Rate
Receiver Propagation Delay
t
PHL
t
PLH
Receiver Output Enable Time
Receiver Output Disable Time
Driver Skew
Receiver Skew
Transition-Region Slew Rate
MIN.
TYP.
MAX.
UNITS
CONDITIONS
250
kbps
R
L
= 3k
Ω
,
C
L
= 1000pF, one driver
switching
Receiver input to receiver output,
C
L
= 150pF
Normal operation
Normal operation
I t
PLH
- t
PHL
I,T
A
= 25
O
C
I t
PLH
- t
PHL
I
V
CC
= 3.3V, R
L
= 3k
Ω
,
T
AMB
= 25
O
C,
measurements taken from -3.0V to
+3.0V or +3.0V to -3.0V
0.15
0.15
µS
200
200
100
50
30
ns
ns
ns
ns
V/
µs
TYPICAL PERFOMANCE CHARACTERISTICS
Unless otherwise noted, the following perfomance characteristics apply for V
CC
= +3.3V, 250kbps data rate, all drivers loaded with 3kΩ, 0.1µF charge
pump capacitors, and T
AMB
= +25°C.
TRANSMITTER OUTPUT vs. LOAD CAPACITANCE
6
4
2
0
-2 0
-4
-6
pF
1000
2000
3000
4000
5000
VOH
VOL
25
20
15
10
5
0
0
1000
2000
pF
3000
4000
5000
POS. SR
NEG SR
SLEW RATE vs. LOAD CAPACITANCE
Figure 1.
Figure 2.
SUPPLY CURRENT vs LOAD CAPACITANCE
60
50
40
30
20
10
0
0
1000
2000
pF
3000
4000
5000
250Kbps
120Kbps
20Kbps
Figure 3. Supply Current VS. Load Capacitance when
Transmitting Data
Date: 03/04/05
SP3238E Intelligent +3.0V to +5.5V RS-232 Transceiver
© Copyright 2005 Sipex Corporation
4
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