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SP3249E
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
■
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
SP3249E
24 C1+
23
22
21
V+
V
CC
C1-
20 T1IN
19 T2IN
18 T3IN
17 R1OUT
16
R2OUT
15 T4IN
14
13
R3OUT
T5IN
Now Available in Lead Free Packaging
DESCRIPTION
The SP3249E device is an RS-232 transceiver solution intended for portable or hand-held
applications such as notebook and palmtop computers. The SP3249E 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 SP3249E device to
deliver compliant RS-232 performance from a single power supply ranging from +3.0V to
+5.0V. The SP3249E is a 5-driver/3-receiver device, ideal for laptop/notebook computer and
PDA applications.
SELECTION TABLE
Device
SP3223E
SP3243E
SP3238E
SP3239E
SP3249E
Power Supplies
+3.0V to +5.5V
+3.0V to +5.5V
+3.0V to +5.5V
+3.0V to +5.5V
+3.0V to +5.5V
RS-232
Drivers
2
3
5
5
5
RS-232
Receivers
2
5
3
3
3
External
Components
4 capacitors
4 capacitors
4 capacitors
4 capacitors
4 capacitors
AUTO ON-LINE
®
Circuitry
YES
YES
YES
NO
NO
TTL 3-State
YES
YES
YES
YES
NO
No. of
Pins
20
28
28
28
24
Applicable U.S. Patents - 5,306,954; and other patents pending.
Date: 03/23/05
SP3249E 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 .................................................. .-0.3V to +6.0V
RxIN .................................................................. +25V
Output Voltages
TxOUT ........................................................... +13.2V
RxOUT ..................................... -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.
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
Supply Current
MIN.
TYP.
0.3
MAX.
1.0
UNITS
mA
CONDITIONS
V
CC,
no load
LOGIC INPUTS AND RECEIVER OUTPUTS
Input Logic Threshold
LOW
HIGH
Input Leakage Current
Output Voltage LOW
Output Voltage HIGH
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
3
-25
0.6
0.8
1.2
1.5
1. 5
1. 8
0.5
5
7
2.4
2.4
25
V
V
V
V
V
V
kΩ
V
CC
= 3.3V
V
CC
= 5.0V
V
CC
= 3.3V
V
CC
= 5.0V
±5.0
300
±3 5
±60
±5.4
V
Ω
mA
All driver outputs loaded with 3K
Ω
to GND
V
CC
= V+ = V- = 0V, V
OUT
= ±2V
V
OUT
= GND
V
CC
- 0.6
V
CC
- 0.1
0.8
2.4
+0.01
+1.0
0.4
V
µA
V
V
V
CC
= +3.3V or +5.0V, TxIN
TxIN, T
A
= 25° C
I
OUT
= 1.6mA
I
OUT
= -1.0mA
Date: 03/23/05
SP3249E 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
TIMING CHARACTERISTICS
Maximum Data 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
Receiver Propagation Delay
t
PHL
t
PLH
Receiver Output Enable Time
Receiver Output Disable Time
Driver Skew
Receiver Skew
Transition-Region Slew Rate
0.15
0.15
200
200
100
50
30
µS
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
-4
-6
pF
0
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
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: 03/23/05
SP3249E Intelligent +3.0V to +5.5V RS-232 Transceiver
© Copyright 2005 Sipex Corporation
3
PIN DESCRIPTION
NAME
C2+
GND
C2-
V-
T
1
OUT
T
2
OUT
T
3
OUT
R
1
IN
R
2
IN
T
4
OUT
R
3
IN
T
5
OUT
T
5
IN
R
3
OUT
T
4
IN
R
2
OUT
R
1
OUT
T
3
IN
T
2
IN
T
1
IN
C1-
V
CC
V+
C1+
FUNCTION
Positive terminal of the symmetrical charge-pump capacitor C2.
Ground.
Negative terminal of the symmetrical charge-pump capacitor C2.
Regulated -5.5V output generated by the charge pump.
RS-232 driver output.
RS-232 driver output.
RS-232 driver output.
RS-232 receiver input.
RS-232 receiver input.
RS-232 driver output.
RS-232 receiver input.
RS-232 driver output.
TTL/CMOS driver input.
TTL/CMOS receiver output.
TTL/CMOS driver input.
TTL/CMOS receiver output.
TTL/CMOS receiver output.
TTL/CMOS driver input.
TTL/CMOS driver input.
TTL/CMOS driver input.
Negative terminal of the symmetrical charge-pump capacitor C1.
+3.0V to +5.5V supply voltage.
Regulated +5.5V output generated by the charge pump.
Positive terminal of the voltage doubler charge-pump capacitor C1
PIN
NO.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
Table 1. Device Pin Description
Date: 03/23/05
SP3249E Intelligent +3.0V to +5.5V RS-232 Transceiver
© Copyright 2005 Sipex Corporation
4
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