SP3221E
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
■
Operates with EIA/TIA-232 and adheres
to EIA/TIA-562 down to a +2.7V power
source
■
Auto-Online
™
circuitry allows 1µA
supply current when in shutdown
■
240kbps data rate under load
■
6V/µs minimum slew rate
■
The SP3221 is the industries smallest
single-supply RS-232 transceiver
package
■
Enhanced ESD Specifications:
+15KV Human Body Model
+15KV
IEC1000-4-2 Air Discharge
+8KV
IEC1000-4-2 Contact Discharge
EN
1
16 SHUTDOWN
15 V
CC
14 GND
SP3221
13
12
T1OUT
ONLINE
C1+ 2
V+
C1-
C2+
C2-
V-
R1IN
3
4
5
6
7
8
11 T1IN
10
9
STATUS
R1OUT
Now Available in Lead Free Packaging
DESCRIPTION
The
SP3221E
is a RS-232 transceiver solution intended for portable or hand-held applications
such as notebook and palmtop computers. The
SP3221E
has a high-efficiency, charge-pump
power supply that requires only 0.1µF capacitors in 3.3V operation. This charge pump and low
dropout transmitters allow the
SP3221E
device to deliver true RS-232 performance from a
single power supply ranging from +3.3V to +5.0V. The
Auto-Online
feature allows the device
to automatically "wake-up" during a shutdown state when an RS-232 cable is connected .
Otherwise, the device automatically shuts itself down drawing less than 1µA.
SELECTION TABLE
Device
SP3221E
SP3220E
Power Supplies
+3.0V to +5.5V
+3.0V to +5.5V
RS-232
Drivers
1
1
RS-232
Receivers
1
1
External
Components
4 (0.1µF)
capacitors
4 (0.1µF)
capacitors
Auto-Online
Circuitry
YES
NO
TTL 3-State
YES
YES
No. of
Pins
16
16
Applicable U.S. Patents - 5,306,954; and other patents pending.
Date: 7/21/04
SP3221E +3.0V to +5.5V RS-232 Transceiver
© Copyright 2004 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, EN .................................-0.3V to +6.0V
RxIN....................................................................+15V
Output Voltages
TxOUT.................................................................+15V
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
16-pin PDIP (derate 14.3mW/
o
C above+70
o
C).....1150mW
16-pin SSOP (derate 9.69mW/
o
C above +70
o
C)....775mW
NOTE 1:
V+ and V- can have maximum magnitudes of 7V, but their absolute difference cannot exceed 13V.
SPECIFICATIONS
Unless otherwise noted, the following specifications apply for V
CC
= +3.0V to +5.5V with T
AMB
= T
MIN
to T
MAX
.
Typical values apply at V
CC
= +3.3V or +5.0V and T
AMB
= 25°C.
PARAMETER
DC CHARACTERISTICS
Supply Current,
Auto-Online
1.0
10
µA
All RxIN open, ONLINE = GND,
SHUTDOWN = V
CC
,
V
CC
= +3.3V, T
AMB
= +25° C
SHUTDOWN = GND,
V
CC
= +3.3V, T
AMB
= +25° C
ONLINE = SHUTDOWN = V
CC
,
no load, V
CC
= +3.3V, T
AMB
= +25° C
MIN.
TYP.
MAX.
UNITS
CONDITIONS
Supply Current, Shutdown
Supply Current,
Auto-Online
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
2.0
±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,
EN, ONLINE,
SHUTDOWN
TxIN, EN, ONLINE, SHUTDOWN,
T
AMB
= +25° C
Receivers disabled
I
OUT
= 1.6mA
I
OUT
= -1.0mA
Date: 7/21/04
SP3221E +3.0V to +5.5V RS-232 Transceiver
© Copyright 2004 Sipex Corporation
2
Unless otherwise noted, the following specifications apply for V
CC
= +3.0V to +5.5V with T
AMB
= T
MIN
to T
MAX
.
Typical values apply at V
CC
= +3.3V or +5.0V and T
AMB
= 25°C.
PARAMETER
DRIVER OUTPUTS
Output Voltage Swing
Output Resistance
Output Short-Circuit Current
Output Leakage Current
± 5.0
30 0
± 35
± 70
± 60
± 100
± 25
± 5. 4
V
Ω
mA
µA
All driver outputs loaded with 3K
Ω
to GND, T
AMB
= +25° C
V
CC
= V+ = V- = 0V, V
OUT
= ± 2V
V
OUT
= 0V
V
OUT
= ± 15V
V
CC
= 0V or 3.0V to 5.5V,
V
OUT
= ± 12V, Drivers disabled
MIN.
TYP.
MAX.
UNITS
CONDITIONS
SPECIFICATIONS (continued)
RECEIVER INPUTS
Input Voltage Range
Input Threshold LOW
Input Threshold LOW
Input Threshold HIGH
Input Threshold HIGH
Input Hysteresis
Input Resistance
3
-15
0.6
0. 8
1.2
1.5
1.5
1.8
0. 3
5
7
2.4
2.4
15
V
V
V
V
V
V
kΩ
V
CC
= 3.3V
V
CC
= 5.0V
V
CC
= 3.3V
V
CC
= 5.0V
Auto-Online
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 15
Figure 15
20
µS
Figure 15
Date: 7/21/04
SP3221E +3.0V to +5.5V RS-232 Transceiver
© Copyright 2004 Sipex Corporation
3
SPECIFICATIONS (continued)
Unless otherwise noted, the following specifications apply for V
CC
= +3.0V to +5.5V with T
AMB
= T
MIN
to T
MAX
.
Typical values apply at V
CC
= +3.3V or +5.0V and T
AMB
= 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
120
240
kbps
µs
ns
ns
500
1000
30
ns
ns
V/
µs
R
L
= 3K
Ω
, C
L
= 1000pF, one driver active
Receiver input to Receiver output, C
L
= 150pF
Normal operation
Normal operation
| t
PHL
- t
PLH
|, T
AMB
= 25
o
C
| t
PHL
- t
PLH
|
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
MIN.
TYP.
MAX.
UNITS
CONDITIONS
0.3
0.3
200
200
100
200
TYPICAL PERFORMANCE CHARACTERISTICS
Unless otherwise noted, the following performance characteristics apply for V
CC
= +3.3V, 235Kbps data rate, all drivers
loaded with 3KΩ, 0.1µF charge pump capacitors, and T
AMB
= +25°C.
6
Transmitter Output Voltage [V]
14
12
10
4
2
0
0
-2
-4
-6
Load Capacitance [pF]
500
1000
1500
Slew Rate [V/µs]
Vout+
Vout-
8
6
4
2
0
0
500
1000
1500
Load Capacitance [pF]
2000
+Slew
-Slew
Figure 1. Transmitter Output Voltage VS. Load
Capacitance
40
35
30
25
20
15
10
5
0
0
500
1000
1500
Load Capacitance [pF]
2000
118KHz
60KHz
10KHz
Figure 2. Slew Rate VS. Load Capacitance
Figure 3. Supply Current VS. Load Capacitance when
Transmitting Data
Date: 7/21/04
SP3221E +3.0V to +5.5V RS-232 Transceiver
© Copyright 2004 Sipex Corporation
Supply Current [mA]
4
NAME
EN
FUNCTION
Receiver Enable. Apply logic HIGH for normal operation.
Apply logic LOW to disable the receiver outputs (high-Z
state).
Positive terminal of the voltage doubler charge-pump
capacitor.
Regulated +5.5V output generated by the charge pump.
Negative terminal of the voltage doubler charge-pump
capacitor.
Positive terminal of the inverting charge-pump capacitor.
Negative terminal of the inverting charge-pump capacitor.
Regulated -5.5V output generated by the charge pump.
RS-232 receiver input.
TTL/CMOS receiver output.
TTL/CMOS Output indicating ONLINE and SHUTDOWN
status.
TTL/CMOS driver input.
Apply logic HIGH to override
Auto-Online
circuitry keeping
drivers active (SHUTDOWN must also be logic HIGH, refer
to
Table 2
).
RS-232 driver output.
Ground.
+3.0V to +5.5V supply voltage.
PIN NO.
1
C1+
V+
C1-
C2+
C2-
V-
R
1
IN
R
1
OUT
STATUS
T
1
IN
ONLINE
2
3
4
5
6
7
8
9
10
11
12
T
1
OUT
GND
V
CC
13
14
15
Apply logic LOW to shut down drivers and charge pump.
SHUTDOWN This overrides all
Auto-Online
circuitry and ONLINE (refer to
Table 2
).
Table 1. Device Pin Description
16
Date: 7/21/04
SP3221E +3.0V to +5.5V RS-232 Transceiver
© Copyright 2004 Sipex Corporation
5
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