1
Rev.4/08/02
SP3249E Intelligent +3.0V to +5.5V RS-232 Transceivers
Copyright 2002 Sipex Corporation
SP3249E
Intelligent +3.0V to +5.5V RS-232 Transceivers
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 0.1
F 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.
s
Meets true EIA/TIA-232-F Standards
from a +3.0V to +5.5V power supply
s
Interoperable with EIA/TIA-232 and
adheres to EIA/TIA-562 down to a +2.7V
power source
s
Minimum 250Kbps data rate under load
s
Regulated Charge Pump Yields Stable
RS-232 Outputs Regardless of V
CC
Variations
s
Enhanced ESD Specifications:
+15KV Human Body Model
+15KV IEC1000-4-2 Air Discharge
+8KV IEC1000-4-2 Contact Discharge
DESCRIPTION
SELECTION TABLE
Applicable U.S. Patents - 5,306,954; and other patents pending.
Part
Power
RS-232
RS-232
External
AUTO ON-LINETM
TTL
Number
Number
Supplies
Drivers
Receivers
Components
Circuitry
3-State
of Pins
SP3223E
+3.0V to +5.5V
2
2
4 capacitors
YES
YES
20
SP3243E
+3.0V to +5.5V
3
5
4 capacitors
YES
YES
28
SP3238E
+3.0V to +5.5V
5
3
4 capacitors
YES
YES
28
SP3239E
+3.0V to +5.5V
5
3
4 capacitors
NO
YES
28
SP3249E
+3.0V to +5.5V
5
3
4 capacitors
NO
NO
24
Rev.4/08/02
SP3249E Intelligent +3.0V to +5.5V RS-232 Transceivers
Copyright 2002 Sipex Corporation
2
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
SPECIFICATIONS
V
CC
= +3.0 to +5.5, C1 -C4 = 0.1
F (tested at 3.3V + 5%), C1-C4 = 0.22
F (tested at 3.3V + 10%), C1 = 0.047
F, and C2-C4 = 0.33
F (tested at 5.0V
+ 10%), T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25
C.)
Note 1: V+ and V- can have maximum magnitudes of 7V, but their absolute difference cannot exceed 13V.
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
PARAMETER
MIN.
TYP.
MAX.
UNITS
CONDITIONS
Supply Current
0.3
1.0
mA
V
CC
, no load
LOGIC INPUTS AND RECEIVER OUTPUTS
Input Logic Threshold
LOW
0.8
V
V
CC
= +3.3V or +5.0V, TxIN
HIGH
2.4
V
V
CC
= +3.3V or +5.0V, TxIN
Input Leakage Current
0.01
1.0
A
TxIN, T
A
= 25
C
Output Voltage LOW
0.4
V
I
OUT
= 1.6mA
Output Voltage HIGH
V
CC
- 0.6
V
CC
- 0.1
V
I
OUT
= -1.0mA
DRIVER OUTPUTS
Output Voltage Swing
5.0
5.4
V
All driver outputs loaded with
3K
to GND
Output Resistance
300
V
CC
= V+ = V- = 0V, V
OUT
=
2V
Output Short-Circuit Current
35
60
mA
V
OUT
= GND
RECEIVER INPUTS
Input Voltage Range
-25
25
V
Input Threshold LOW
0.6
1.2
V
V
CC
= 3.3V
Input Threshold LOW
0.8
1.5
V
V
CC
= 5.0V
Input Threshold HIGH
1.5
2.4
V
V
CC
= 3.3V
Input Threshold HIGH
1.8
2.4
V
V
CC
= 5.0V
Input Hysteresis
0.5
V
Input Resistance
3
5
7
k
3
Rev.4/08/02
SP3249E Intelligent +3.0V to +5.5V RS-232 Transceivers
Copyright 2002 Sipex Corporation
SPECIFICATIONS
V
CC
= +3.0 to +5.5, C1 -C4 = 0.1
F (tested at 3.3V + 5%), C1-C4 = 0.22
F (tested at 3.3V + 10%), C1 = 0.047
F, and C2-C4 = 0.33
F (tested at 5.0V
+ 10%), T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25
C.)
PARAMETER
MIN.
TYP.
MAX.
UNITS
CONDITIONS
TIMING CHARACTERISTICS
Maximum Data Rate
250
kbps
R
L
= 3k
, C
L
= 1000pF, one
driver switching
Receiver Propagation Delay
t
PHL
0.15
s
Receiver input to receiver
output, C
L
= 150pF
t
PLH
0.15
s
Receiver input to receiver
output, C
L
= 150pF
Receiver Output Enable Time
200
ns
Normal operation
Receiver Output Disable Time
200
ns
Normal operation
Driver Skew
100
ns
I t
PLH
- t
PLH
I,T
A
= 25
C
Receiver Skew
50
ns
I t
PLH
- t
PLH
I
Transition-Region Slew Rate
30
V/
s
V
CC
= 3.3V, R
L
= 3k
,
T
AMB
=25
C, measurements
taken from -3.0V to +3.0V or
+3.0V to -3.0V
TYPICAL PERFORMANCE CHARACTERISTICS
Unless otherwise noted, the following performance characteristics apply for V
CC
= +3.3V, 250kbps data rate, all drivers loaded with 3k
,
0.1
F charge
pump capacitors, and T
AMB
= +25
C.
TRANSMITTER OUTPUT vs. LOAD CAPACITANCE
-6
-4
-2
0
2
4
6
0
1000
2000
3000
4000
5000
pF
VOH
VOL
SLEW RATE vs. LOAD CAPACITANCE
0
5
10
15
20
25
0
1000
2000
3000
4000
5000
pF
POS. SR
NEG SR
Figure 3. Supply Current vs. Load Capacitance when
Transmitting Data
SUPPLY CURRENT vs LOAD CAPACITANCE
0
10
20
30
40
50
60
0
1000
2000
3000
4000
5000
pF
250Kbps
120Kbps
20Kbps
Figure 1. Transmitter Output vs. Load Capacitance
Figure 2. Slew Rate vs. Load Capacitance
Rev.4/08/02
SP3249E Intelligent +3.0V to +5.5V RS-232 Transceivers
Copyright 2002 Sipex Corporation
4
Table 1. Device Pin Description
PIN DESCRIPTION
E
M
A
N
N
O
I
T
C
N
U
F
N
I
P
.
O
N .
O
N .
O
N .
O
N .
O
N
+
2
C
.
r
o
t
i
c
a
p
a
c
p
m
u
p
-
e
g
r
a
h
c
g
n
i
t
r
e
v
n
i
e
h
t
f
o
l
a
n
i
m
r
e
t
e
v
i
t
i
s
o
P
1
D
N
G
.
d
n
u
o
r
G
2
-
2
C
.
r
o
t
i
c
a
p
a
c
p
m
u
p
-
e
g
r
a
h
c
g
n
i
t
r
e
v
n
i
e
h
t
f
o
l
a
n
i
m
r
e
t
e
v
i
t
a
g
e
N
3
-
V
.
p
m
u
p
e
g
r
a
h
c
e
h
t
y
b
d
e
t
a
r
e
n
e
g
t
u
p
t
u
o
V
5
.
5
-
d
e
t
a
l
u
g
e
R
4
T
1
T
U
O
.
t
u
p
t
u
o
r
e
v
i
r
d
2
3
2
-
S
R
5
T
2
T
U
O
.
t
u
p
t
u
o
r
e
v
i
r
d
2
3
2
-
S
R
6
T
3
T
U
O
.
t
u
p
t
u
o
r
e
v
i
r
d
2
3
2
-
S
R
7
R
1
N
I
.
t
u
p
n
i
r
e
v
i
e
c
e
r
2
3
2
-
S
R
8
R
2
N
I
.
t
u
p
n
i
r
e
v
i
e
c
e
r
2
3
2
-
S
R
9
T
4
T
U
O
.
t
u
p
t
u
o
r
e
v
i
r
d
2
3
2
-
S
R
0
1
R
3
N
I
.
t
u
p
n
i
r
e
v
i
e
c
e
r
2
3
2
-
S
R
1
1
T
5
T
U
O
.
t
u
p
t
u
o
r
e
v
i
r
d
2
3
2
-
S
R
2
1
T
5
N
I
.
t
u
p
n
i
r
e
v
i
r
d
S
O
M
C
/
L
T
T
3
1
R
3
T
U
O
.
t
u
p
t
u
o
r
e
v
i
e
c
e
r
S
O
M
C
/
L
T
T
4
1
T
4
N
I
.
t
u
p
n
i
r
e
v
i
r
d
S
O
M
C
/
L
T
T
5
1
R
2
T
U
O
.
t
u
p
t
u
o
r
e
v
i
e
c
e
r
S
O
M
C
/
L
T
T
6
1
R
1
T
U
O
.
t
u
p
t
u
o
r
e
v
i
e
c
e
r
S
O
M
C
/
L
T
T
7
1
T
3
N
I
.
t
u
p
n
i
r
e
v
i
r
d
S
O
M
C
/
L
T
T
8
1
T
2
N
I
.
t
u
p
n
i
r
e
v
i
r
d
S
O
M
C
/
L
T
T
9
1
T
1
N
I
.
t
u
p
n
i
r
e
v
i
r
d
S
O
M
C
/
L
T
T
0
2
-
1
C
.
r
o
t
i
c
a
p
a
c
p
m
u
p
-
e
g
r
a
h
c
r
e
l
b
u
o
d
e
g
a
t
l
o
v
e
h
t
f
o
l
a
n
i
m
r
e
t
e
v
i
t
a
g
e
N
1
2
V
C
C
.
e
g
a
t
l
o
v
y
l
p
p
u
s
V
5
.
5
+
o
t
V
0
.
3
+
2
2
+
V
.
p
m
u
p
e
g
r
a
h
c
e
h
t
y
b
d
e
t
a
r
e
n
e
g
t
u
p
t
u
o
V
5
.
5
+
d
e
t
a
l
u
g
e
R
3
2
+
1
C
.
r
o
t
i
c
a
p
a
c
p
m
u
p
-
e
g
r
a
h
c
r
e
l
b
u
o
d
e
g
a
t
l
o
v
e
h
t
f
o
l
a
n
i
m
r
e
t
e
v
i
t
i
s
o
P
4
2
5
Rev.4/08/02
SP3249E Intelligent +3.0V to +5.5V RS-232 Transceivers
Copyright 2002 Sipex Corporation
Figure 5. SP3249E Typical Operating Circuit
Figure 4. SP3249E Pinout Configuration
T4IN
1
2
3
4
5
6
7
24
23
22
C2-
V-
R1IN
R2IN
R3IN
C2+
C1-
GND
V
CC
V+
T1IN
8
9
10
11
18
19
20
21
12
17
T1OUT
T2OUT
T3OUT
T3IN
T2IN
T5IN
R3OUT
R2OUT
R1OUT
SP3249E
C1+
T4OUT
T5OUT
16
15
14
13
SP3249E
24
21
3
1
23
4
22
GND
C1+
C1-
C2+
C2-
V+
V-
V
CC
0.1
F
0.1
F
0.1
F
+
C2
C5
C1
+
+
C3
C4
+
+
0.1
F
0.1
F
V
CC
2
5k
5k
5k
17
16
14
8
9
11
RS-232
INPUTS
TTL/CMOS
OUTPUTS
R
1
OUT
R
1
IN
R
2
IN
R
3
IN
R
2
OUT
R
3
OUT
20
19
18
5
6
7
RS-232
OUTPUTS
TTL/CMOS
INPUTS
T
1
IN
T
2
OUT
T
2
IN
T
3
IN
T
3
OUT
T
1
OUT
15
13
10
12
T
4
OUT
T
4
IN
T
5
IN
T
5
OUT
PDF 
ZIP