®
Preliminary
SP3282EB
Intelligent +2.35V to +5.5V RS-232 Transceivers
FEATURES
■
Operates over entire Li+ Battery range
■
Interoperable with EIA/TIA-232-F and
adheres to EIA/TIA-562 down to a
+2.35V power supply
■
AUTO ON-LINE
®
circuitry automatically
wakes up from a 1µA shutdown
■
Minimum 250Kbps data rate
■
Regulated charge pump yields stable
RS-232 outputs regardless of V
CC
variations
■
Unique V
L
for low logic compatibility
regardless of V
CC
■
Enhanced ESD Specifications for all
TTL and RS-232 I/O lines.
+15kV Human Body Model
+15kV IEC1000-4-2 Air Discharge
+8kV IEC1000-4-2 Contact Discharge
■
Enhanced battery life as the V
CC
drops
below 3.1V
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
SP3282EB
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
VL
15 STATUS
Now Available in Lead Free Packaging
APPLICATIONS
■
Cell phone data cables
■
PDAs, PDA cradles
■
Hand held equipment
■
Peripherals
DESCRIPTION
The SP3282EB device is an RS-232 transceiver solution intended for portable or hand-held
applications such as notebook and palmtop computers, PDAs, cell phones and their data cables
and cradles.
The SP3282EB is compatible with low voltage logic down to 1.8V using a logic select pin (VL)
which conditions the logic inputs and outputs to be compatible with system logic.
The SP3282EB 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
SP3282EB device to deliver compliant RS-232 performance from a single +3.3V to +5.5Vpower
supply and additionally adhere to EIA/TIA-562 driver outputs levels down to a power supply
voltage of 2.35V.
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.
TABLE 1
Device
SP3282EB
Power
Supplies
2.35V to 5.5V
RS-232
Drivers
5
RS232
Receivers
3
External
AUTO ON-LINE
®
Components
Circuitry
4
yes
Data
No. of
Rate
Pins
250kbps 28
Applicable U.S. Patents - 5,306,954; and 6,378,026.
Date: 02/24/05
SP3282EB Intelligent +2.35V to +5.5V RS-232 Transceivers
© 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
V
L.
.......................................................-0.3V to +6.0V
TxIN, ONLINE, SHUTDOWN, .............0.3V to +6.0V
RxIN..................................................................+25V
Output Voltages
TxOUT............................................................+13.2V
RxOUT, STATUS.......................-0.3V to (V
L
+ 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
ELECTRICAL CHARACTERISTICS
V
CC
= +2.35 to +5.5V, V
L
=+1.8 to +5.5V, C1 - C4 = 0.22µF.
T
A
=T
MIN
to T
MAX
, unless otherwise noted. Typical values are at V
CC
=V
L
=+3.3V, and T
A
= +25°C.)
PARAMETER
SUPPLY CURRENT
Supply Current,
AUTO ON-LINE
®
Supply Current, Shutdown
MIN.
TYP.
1.0
MAX.
10
UNITS
µA
CONDITIONS
All RxIN open, all TxIN at V
L
or GND,
V
CC
=V
L
=+3.3V, T
A
=25°C
ONLINE = GND, SHUTDOWN = V
L
,
All RxIN open, all TxIN at V
L
or GND
V
CC
=V
L
=+3.3V, T
A
=25°C
ONLINE = V
L
or GND, SHUTDOWN =
GND
All TxIN at V
L
or GND, ONLINE = V
L
,
V
CC
=V
L
=+3.3V, T
A
=25°C
SHUTDOWN = V
L
,no load
TxIN, ONLINE, SHUTDOWN
V
L
= +3.3V or +5.0V
V
L
= +2.5V
V
L
= +1.8V
TxIN, ONLINE, SHUTDOWN
V
L
= +5.0V
V
L
= +3.3V
V
L
= +2.5V
V
L
= +1.8V
TxIN, ONLINE, SHUTDOWN,
T
A
= 25°C
RxOUT, Receivers disabled
I
OUT
= +1.6mA, V
L
=2.5V, 3.3V, or 5.0V
I
OUT
= +0.8mA, V
L
=1.8V
I
OUT
= -1.0mA, V
L
=2.5V, 3.3V, 5.0V
I
OUT
= -0.5mA, V
L
=1.8V
TxOUT=±5.0V to
±3.7V
TxOUT=±3.7V to
±5.0V
1.0
10
µA
Supply Current,
AUTO ON-LINE
®
Disabled
0.3
1.0
mA
LOGIC INPUTS AND RECEIVER OUTPUTS
Input Logic Threshold LOW
0.8
0.6
0.4
Input Logic Threshold HIGH
2.4
2.0
1.4
0.9
Transmitter Input Hysteresis
Input Leakage Current
Output Leakage Current
Output Voltage LOW
Output Voltage HIGH
DRIVER OUTPUTS
V
CC
Mode Switch Point
(V
CC
is Falling)
V
CC
Mode Switch Point
(V
CC
is Rising)
V
CC
Mode Switch Point
Hysteresis
2.95
3.3
3.1
3.5
400
3.25
3.7
V
V
mV
V
L
- 0.6
V
L
- 0.6
V
L
- 0.1
V
L
- 0.1
0.3
±0.01
±0.05
±1.0
±10
0.4
0.4
V
µA
µA
V
V
V
V
Date: 02/24/05
SP3282EB Intelligent +2.35V to +5.5V RS-232 Transceivers
© Copyright 2005 Sipex Corporation
2
ELECTRICAL CHARACTERISTICS
V
CC
= +2.35 to +5.5V, V
L
=+1.8 to +5.5V, C1 - C4 = 0.22µF.
T
A
=T
MIN
to T
MAX
, unless otherwise noted. Typical values are at V
CC
=V
L
=+3.3V, and T
A
= +25°C.)
PARAMETER
Output Voltage Swing
MIN.
TYP.
MAX.
UNITS
CONDITIONS
All driver outputs loaded with 3KΩ to
GND, T
A
=25°C
V
CC
=3.25V to 5.5V,
V
CC
=2.35 to 2.95V,
V
CC
= V+ = V- = 0V, V
TXOUT
=
±2V
V
TXOUT
= GND
V
TXOUT
=+/-12V, transmitter disabled,
V
CC
=0V or 2.35V to 5.5V
±5.0
+/-3.7
Output Resistance
Output Short-Circuit Current
Ouput Leakage Current
RECEIVER INPUTS
Input Voltage Range
Input Threshold
LOW
-25
0.3
0.6
0.8
300
±5.4
V
Ω
±35
±60
+/-25
mA
µA
25
0.8
1.2
1.5
1.0
1.5
1.8
0.3
1.8
2.4
2.4
7
V
V
VL=1.8V, T
A
=25°C
VL=2.5V or 3.3V, T
A
=25°C
VL=5.0V, T
A
=25°C
VL=1.8V, T
A
=25°C
VL=2.5V or 3.3V, T
A
=25°C
VL=5.0V, T
A
=25°C
T
A
=25°C
HIGH
V
Input Hysteresis
Input Resistance
AUTO
LOW
HIGH
Receiver Threshold to Drivers
Enabled (t
ONLINE
)
Receiver +/- Threshold
to Status HIGH (t
STSH
)
to Status LOW (t
STSL
)
AC Characteristics
Maximum Data Rate
Receiver Propagation Delay
t
PHL
t
PLH
Receiver Output Enable Time
Receiver Output Disable Time
Time to Exit Shutdown
Driver Skew |t
PHL
-tP
LH
|
Receiver Skew |t
PHL
-t
PLH
|
Transition-Region Slew Rate
250
V
L
- 0.6
ON-LINE
®
STATUS Output Voltage
3
V
kΩ
5
CIRCUITRY CHARACTERISTICS (ONLINE = GND, SHUTDOWN = V
CC
)
0.4
V
L
-0.1
200
µs
V
I
OUT
= 1.6mA, V
L
=2.5V, 3.3V, 5.0V
or I
OUT
= +0.8mA, V
L
=1.8V
I
OUT
= -1.0mA, V
L
=2.5V, 3.3V, 5.0V
or I
OUT
= -0.5mA, V
L
=1.8V
20
20
µs
µs
kbps
SP3282EB: R
L
= 3kΩ, C
L
= 1000pF,
one driver switching
Receiver input to output, C
L
= 150pF
0.15
0.15
200
200
100
100
50
µs
ns
ns
µs
ns
ns
Normal operation
Normal operation
|V
TXOUT
|>3.7V, V
CC
=3.3V
Measured at zero crossover
Measured at zero crossover
V
CC
= 3.3V, R
L
= 3kΩ to 7kΩ ,
T
A
= 25°C, measurements taken from
-3.0V to+3.0V or +3.0V to -3.0V
C
L
= 150pF to 1000pF
30
V/µs
Date: 02/24/05
SP3282EB Intelligent +2.35V to +5.5V RS-232 Transceivers
© 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
ONLINE
SHUTDOWN
STATUS
V
L
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 -4.0V or -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.
Apply logic HIGH to override AUTO ON-LINE
®
circuitry keeping drivers active
(SHUTDOWN must also be logic HIGH, refer to Table 2).
Apply logic LOW to shut down drivers and charge pump.
This overrides all AUTO ON-LINE
®
circuitry and ONLINE (refer to Table 2).
TTL/CMOS Output indicating if a RS-232 signal is present on any Rx input.
Logic level supply voltage selection
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.
+2.35V to +5.5V supply voltage.
Regulated +4.0V or +5.5V output generated by the charge pump.
Positive terminal of the symmetrical charge-pump capacitor C1
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
13
PIN NO.
1
2
3
4
5
6
7
8
9
10
11
12
Table 2. Device Pin Description
Date: 02/24/05
SP3282EB Intelligent +2.35V to +5.5V RS-232 Transceivers
© Copyright 2005 Sipex Corporation
4
TYPICAL PERFOMANCE CHARACTERISTICS
Unless otherwise noted, the following perfomance characteristics apply for V
CC
= +4.2V, 250kbps data rate, all drivers loaded with 3kΩ, 0.22µF charge
pump capacitors, and T
AMB
= +25°C.
V
CC
+
26
V
CC
28 C1+
0.1µF
25 C1-
1 C2+
C2
+
0.1µF
3 C2-
24
T
1
IN
23
T
2
IN
TTL/CMOS
INPUTS
22
T
3
IN
19
T
4
IN
17
T
5
IN
T
1
OUT
5
T
2
OUT
6
T
3
OUT
7
T
4
OUT
10
T
5
OUT
12
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
SP3282EB
28 C1+
27
26
25
V+
V
CC
C1-
C5
0.1µF
C1
+
V+
27
C3
+
0.1µF
SP3282EB
V- 4
C4
+
0.1µF
24 T1IN
23 T2IN
22 T3IN
21 R1OUT
20
R2OUT
RS-232
OUTPUTS
19 T4IN
18
17
16
R3OUT
T5IN
VL
V
CC
21
R
1
OUT
TTL/CMOS
OUTPUTS
5kΩ
20
R
2
OUT
5kΩ
18
R
3
OUT
5kΩ
14
13
Logic Level Select
R
1
IN
R
2
IN
R
3
IN
8
9
11
RS-232
INPUTS
SHUTDOWN
ONLINE
15 STATUS
16
V
L
GND
2
Figure 2. SP3282EB Pinout Configuration
Figure 3. SP3282EB Application Diagram
V
CC
+
26
V
CC
28 C1+
0.1µF
25 C1-
1 C2+
C2
+
0.1µF
3 C2-
24
T
1
IN
23
T
2
IN
TTL/CMOS
INPUTS
22
T
3
IN
19
T
4
IN
17
T
5
IN
T
1
OUT
5
T
2
OUT
6
T
3
OUT
7
T
4
OUT
10
T
5
OUT
12
C5
0.1µF
C1
+
V+
27
C3
+
0.1µF
SP3282EB
V-
4
C4
+
0.1µF
RS-232
OUTPUTS
21
R
1
OUT
TTL/CMOS
OUTPUTS
5kΩ
20
R
2
OUT
5kΩ
18
R
3
OUT
V
CC
R
1
IN
R
2
IN
R
3
IN
8
9
11
RS-232
INPUTS
5kΩ
14
13
SHUTDOWN
ONLINE
Logic Level Select
16
V
L
GND
2
Figure 4. Circuit for the connectivity of the SP3282EB with a DB-9 connector
Date: 02/24/05
SP3282EB Intelligent +2.35V to +5.5V RS-232 Transceivers
© Copyright 2005 Sipex Corporation
5
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