®
SP232A/233A/310A/312A
Enhanced RS-232
Line Drivers/Receivers
FEATURES
C
1
+
1
16
V
CC
■
Operates from Single +5V Power Supply
V+
2
15
GND
■
Meets All RS-232F and ITU V.28
C
1
-
3
14
T
1
OUT
Specifications
C
2
+
4
13
R
1
IN
■
Operates with 0.1µF to 1µF Capacitors
C
2
-
5
12
R
1
OUT
■
High Data Rate – 120Kbps Under Load
V-
6
11
T
1
IN
■
Low Power CMOS – 3mA Operation (SP232A)
T
2
OUT
7
10
T
2
IN
■
No External Capacitors Required (SP233A)
R
2
IN
8
9
R
2
OUT
■
Low Power Shutdown (SP310A,SP312A)
■
Enhanced ESD Protection (2kV Human
Body Model)
Now Available in Lead Free Packaging
The
SP232A/233A/310A/312A
devices are a family of line driver and receiver pairs that meet the
specifications of RS-232 and V.28 serial protocols. These devices are pin-to-pin compatible with
popular industry standards. As with the initial versions, the
SP232A/233A/310A/312A
devices
feature at least 120Kbps data rate under load, 0.1µF charge pump capacitors, and overall
ruggedness for commercial applications. This family also features
Sipex's
BiCMOS design
allowing low power operation without sacrificing performance. The series is available in plastic
DIP and SOIC packages operating over the commercial and industrial temperature ranges.
SELECTION TABLE
Number of RS232
Model Drivers
Receivers
SP232A
2
2
SP233A
2
2
SP310A
SP312A
2
2
2
2
No. of Receivers
No. of External
Active in Shutdown 0.1µF Capacitors
N//A
4
N/A
0
0
2
4
4
Shutdown WakeUp TTL Tri–State
No
No
No
No
No
No
Yes
Yes
No
Yes
Yes
Yes
SP232A
DESCRIPTION
Date: 10/17/ 05
SP232A Series Enhanced RS232 Transceivers
© Copyright 2005 Sipex Corporation
1
ABSOLUTE MAXIMUM RATINGS
This is a stress rating only and functional operation of the device at
these or any other conditions above those indicated in the operation
sections of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods of time may affect
reliability.
V
cc .................................................................................................................................................................
+6V
V
+ ....................................................................................................................
(Vcc-0.3V) to +11.0V
V
- ............................................................................................................................................................
-11.0V
Input Voltages
T
IN .........................................................................................................................
-0.3 to (Vcc +0.3V)
R
IN ............................................................................................................................................................
±30V
Output Voltages
T
OUT ....................................................................................................
(V+, +0.3V) to (V-, -0.3V)
R
OUT ................................................................................................................
-0.3V to (Vcc +0.3V)
Short Circuit Duration
T
OUT .........................................................................................................................................
Continuous
Plastic DIP .......................................................................... 375mW
(derate 7mW/°C above +70°C)
Small Outline ...................................................................... 375mW
(derate 7mW/°C above +70°C)
ELECTRICAL CHARACTERISTICS
V
CC
=+5V±10%; 0.1µF charge pump capacitors; T
MIN
to T
MAX
unless otherwise noted.
PARAMETERS
TTL INPUT
Logic Threshold
LOW
HIGH
Logic Pull-Up Current
TTL OUTPUT
TTL/CMOS Output
Voltage, Low
Voltage, High
Leakage Current; T
A
= +25°
RS-232 OUTPUT
Output Voltage Swing
MIN.
TYP.
MAX.
UNITS
CONDITIONS
0.8
2.0
15
200
Volts
Volts
µA
T
IN
; EN, SD
T
IN
; EN, SD
T
IN
= ZeroV
I
OUT
= 3.2mA; Vcc = +5V
I
OUT
= -1.0mA
EN = V
CC
, ZeroV≤V
OUT
≤V
CC
SP310A and SP312A only
All transmitter outputs loaded
with 3kΩ to Ground
V
CC
= ZeroV; V
=
±2V
OUT
Infinite duration
C
L
= 2500pF, R
L
= 3kΩ
0.4
3.5
0.05
±10
Volts
Volts
µA
±5
±6
Volts
Ohms
mA
Kbps
+30
Volts
Volts
Volts
Volts
kΩ
µs
µs
V/µs
V/µs
ns
ns
Output Resistance
300
Output Short Circuit Current
Maximum Data Rate
120
RS-232 INPUT
Voltage Range
-30
Voltage Threshold
LOW
0.8
HIGH
Hysteresis
0.2
Resistance
3
DYNAMIC CHARACTERISTICS
Driver Propagation Delay
Receiver Propagation Delay
Instantaneous Slew Rate
Transition Region Slew Rate
Output Enable Time
Output Disable Time
POWER REQUIREMENTS
V
CC
Power Supply Current
SP232A
SP233A, SP310A, SP312A
V
CC
Supply Current,Loaded
SP232A
SP233A, SP310A, SP312A
Shutdown Supply Current
SP310A,SP312A
±18
240
1.2
1.7
0.5
5
1.5
0.1
10
400
250
2.4
1.0
7
3.0
1.0
30
V
CC
= 5V, T
A
= +25°C
V
CC
= 5V, T
A
= +25°C
V
CC
= 5V, T
A
= +25°C
T
A
= +25°C, -15V
≤
V
IN
≤
+15V
TTL to RS-232; C
L
= 50pF
RS-232 to TTL
C
L
= 10pF, R
L
= 3-7kΩ;
T
A
=+25°C
C
L
= 2500pF, R
L
= 3kΩ;
measured from +3V to -3V
or -3V to +3V
SP310A and SP312A only
SP310A and SP312A only
3
10
15
25
1
5
15
mA
mA
mA
mA
No load, T
A
= +25°C; V
CC
= 5V
No load, T
A
= +25°C; V
CC
= 5V
All transmitters R
L
= 3kΩ;
T
A
= +25°C
All transmitters R
L
= 3kΩ;
T
A
= +25°C
V
CC
= 5V, T
A
= +25°C
10
µA
Date: 10/17/ 05
SP232A Series Enhanced RS232 Transceivers
© Copyright 2005 Sipex Corporation
2
Not 100% tested.
-11
-10
10
12
PERFORMANCE CURVES
9.0
8.5
30
25
20
I
CC
(mA)
V
CC
= 4V
-9
V– Voltage (Volts)
-8
-7
-6
-5
-4
-3
V
CC
= 6V
V+ (Volts)
8
6
V
CC
= 6V
V
CC
= 5V
V
CC
= 6V
V
OH
(Volts)
8.0
7.5
7.0
6.5
6.0
5.5
5.0
4.5
4.75
5.0
V
CC
(Volts)
5.25
5.5
Load current = 0mA
T
A
= 25°C
V
CC
= 5V
15
V
CC
= 5V
10
V
CC
= 4V
5
V
CC
= 3V
0
-55
V
CC
= 4V
4
2
0
0
2
4
6
8
10
12
14
0
5
10
15
20
25
30
35
40
Load Current (mA)
-40
0
25
70
85
125
Load Current (mA)
Temperature (°C)
PINOUTS
C
1
+
V+
C
1
-
C
2
+
C
2
-
V-
T
2
OUT
R
2
IN
1
2
3
16
V
CC
15
GND
14
T
1
OUT
T
2
IN
T
1
IN
R
1
OUT
R
1
IN
T
1
OUT
GND
V
CC
V+ DNC
GND
1
2
20
19
R
2
OUT
R
2
IN
T
2
OUT
Conn to 10
Conn to 11
Conn to 12
C
1
- DNC
C
1
+ DNC
Conn to 15
Conn to 16
SP233ACT/AET
3
4
5
6
7
8
9
18
17
16
15
14
13
12
11
SP232A
4
5
6
7
8
13
R
1
IN
12
R
1
OUT
11
T
1
IN
10
T
2
IN
9
R
2
OUT
Conn to 17
10
20-PIN SOIC
See Figure 2 for
Pin Connections
T
2
IN
T
1
IN
R
1
OUT
R
1
IN
T
1
OUT
GND
V
CC
C
1
+
GND
C
2
-
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
20-PIN PLASTIC DIP
R
2
OUT
R
2
IN
T
2
OUT
V-
C
2
-
C
2
+
V+
C
1
-
V-
C
2
+
NC
*
C
1
+
V+
C
1
-
C
2
+
C
2
-
V-
T
2
OUT
R
2
IN
1
2
3
4
5
6
7
8
9
18
17
16
15
14
13
12
11
10
ON/OFF
V
CC
GND
T
1
OUT
R
1
IN
R
1
OUT
T
1
IN
T
2
IN
R
2
OUT
EN
*
C
1
+
V+
C
1
-
C
2
+
C
2
-
V-
T
2
OUT
R
2
IN
1
2
3
4
18
17
16
15
SHUTDOWN
V
CC
GND
T
1
OUT
R
1
IN
R
1
OUT
T
1
IN
T
2
IN
R
2
OUT
SP233ACP/AEP
SP310A
SP312A
5
6
7
8
9
14
13
12
11
10
*
N.C. for SP310E_A, EN for SP312E_A
Date: 10/17/ 05
SP232A Series Enhanced RS232 Transceivers
© Copyright 2005 Sipex Corporation
3
FEATURES…
The
SP232A/233A/310A/312A
devices are a
family of line driver and receiver pairs that meet
the specifications of RS-232 and V.28 serial
protocols. The ESD tolerance has been im-
proved on these devices to over
±2KV
for the
Human Body Model. These devices are pin-to-
pin compatible with popular industry standards.
The
SP232A/233A/310A/312A
devices
feature10V/µs slew rate, 120Kbps data rate un-
der load, 0.1µF charge pump capacitors, overall
ruggedness for commercial applications, and
increased drive current for longer and more
flexible cable configurations. This family also
features
Sipex's
BiCMOS design allowing low
power operation without sacrificing perfor-
mance.
The
SP232A/233A/310A/312A
devices have
internal charge pump voltage converters which
allow them to operate from a single +5V supply.
The charge pumps will operate with polarized or
non-polarized capacitors ranging from 0.1 to 1µF
and will generate the
±6V
needed for the RS-
232 output levels. Both meet all EIA RS-232F
and ITU V.28 specifications.
The
SP310A
provides identical features as the
SP232A
with the addition of a single control
line which simultaneously shuts down the inter-
nal DC/DC converter and puts all transmitter
and receiver outputs into a high impedance
state. The
SP312A
is identical to the
SP310A
with separate tri-state and shutdown control
lines.
THEORY OF OPERATION
The
SP232A, SP233A, SP310A
and
SP312A
devices are made up of three basic circuit blocks –
1) a driver/transmitter, 2) a receiver and 3) a charge
pump. Each block is described below.
Driver/Transmitter
The drivers are inverting transmitters, which ac-
cept TTL or CMOS inputs and output the RS-232
signals with an inverted sense relative to the input
logic levels. Typically the RS-232output voltage
swing is
±6V.
Even under worst case loading
conditions of 3kOhms and 2500pF, the output is
guaranteed to be
±5V,
which is consistent with the
RS-232 standard specifications. The transmitter
outputs are protected against infinite short-circuits
to ground without degradation in reliability.
+5V INPUT
10
µ
F 6.3V
+
1
0.1
µ
F
+
6.3V
3
4
16
C +
1
V
CC
V+
0.1
µ
F 6.3V
2
+
C
1
-
C +
2
*
Charge Pump
V-
6
0.1
µ
F
+
10V
5
+
0.1
µ
F
10V
C
2
-
400k
Ω
TTL/CMOS OUTPUTS
TTL/CMOS INPUTS
T
1
IN
11
T
1
400k
Ω
14
T
1
OUT
T
2
IN
10
T
2
R
1
5k
Ω
7
T
2
OUT
R
1
OUT
R
1
IN
R
2
OUT
9
SP232A
R
2
5k
Ω
8
R
2
IN
GND
15
*The negative terminal of the V+ storage capacitor can be tied
to either V
CC
or GND. Connecting the capacitor to V
CC
(+5V)
is recommended.
Figure 1. Typical Circuit using the SP232A.
Date: 10/17/ 05
SP232A Series Enhanced RS232 Transceivers
RS-232 INPUTS
12
13
RS-232 OUTPUTS
© Copyright 2005 Sipex Corporation
4
+5V INPUT
+5V INPUT
7
TTL/CMOS OUTPUTS
TTL/CMOS INPUTS
7
TTL/CMOS OUTPUTS
TTL/CMOS INPUTS
V
CC
RS-232 OUTPUTS
V
CC
T
1
IN
2
T
1
IN
2
400k
Ω
T
1
T
2
5
T
1
OUT
400k
Ω
T
1
T
2
5
T
1
OUT
T
2
IN
1
400k
Ω
18
T
2
OUT
T
2
IN
1
400k
Ω
18
T
2
OUT
RS-232 INPUTS
R
1
OUT
R
1
IN
R
1
OUT
R
1
5k
Ω
R
1
IN
5k
Ω
R
2
OUT
20
8
C +
1
13
C
1
-
14
R
2
5k
Ω
2
19
R
2
IN
R
2
OUT
20
13
C +
1
14
8
10
17
R
2
5k
Ω
C
1
-
V+
V-
V-
2
19
R
2
IN
Do not make
connection to
these pins
C +
11
C
2
+
15
SP233ACP
Connect on PCB
Pin 11 to Pin 15
Pin 10 to Pin 16
Pin 12 to Pin 17
Both Pins 6 and 9 to GND
Do not make
connection to
these pins
C +
12
C
2
+
15
Connect on PCB
Pin 12 to Pin 15
Pin 11 to Pin 16
Pin 10 to Pin 17
Both Pins 6 and 9 to GND
V+
12
V-
17
V-
C
2
-
C
2
-
10
16
GND
6
GND
9
SP233ACT
GND
GND
6
9
C
2
-
C
2
-
11
16
Figure 2. Typical Circuits using the SP233ACP and SP233ACT
The instantaneous slew rate of the transmitter
output is internally limited to a maximum of 30V/
µs
in order to meet the standards [EIA RS-232-F ].
The transition region slew rate of these enhanced
products is typically 10V/µs. The smooth transi-
tion of the loaded output from V
OL
to V
OH
clearly
meets the monotonicity requirements of the stan-
dard [EIA RS-232-F].
Receivers
The receivers convert RS-232 input signals to
inverted TTL signals. Since the input is usually
from a transmission line, where long cable lengths
and system interference can degrade the signal, the
+5V INPUT
10
µ
F 6.3V
inputs have a typical hysteresis margin of 500mV.
This ensures that the receiver is virtually immune
to noisy transmission lines.
The input thresholds are 0.8V minimum and 2.4V
maximum, again well within the
±3V
RS-232
requirements. The receiver inputs are also pro-
tected against voltages up to
±25V.
Should an
input be left unconnected, a 5KΩ pulldown resis-
tor to ground will commit the output of the receiver
to a high state.
+5V INPUT
10
µ
F 6.3V
+
+
2
0.1
µ
F
+
6.3V
4
5
17
C +
1
V
CC
3
+
V+
0.1
µF
10V
2
17
C
1
-
C +
2
*
+
0.1
µF
10V
TTL/CMOS INPUTS
0.1
µ
F
+
6.3V
4
5
C +
1
V
CC
V+
0.1
µ
F
10V
3
+
C
1
-
C +
2
*
10V
Charge Pump
V-
7
Charge Pump
V-
7
0.1
µ
F
+
16V
6
TTL/CMOS OUTPUTS
TTL/CMOS INPUTS
0.1
µ
F
+
16V
6
+
0.1
µ
F
C
2
-
400k
Ω
C
2
-
400k
Ω
RS-232 OUTPUTS
T
1
IN
12
T
1
400k
Ω
15
T
1
OUT
T
1
IN
12
T
1
400k
Ω
15
T
1
OUT
T
2
IN
11
T
2
R
1
5k
Ω
8
T
2
IN
11
T
2
OUT
T
2
8
T
2
OUT
RS-232 INPUTS
R
1
OUT
R
1
5k
Ω
R
1
IN
R
2
OUT
10
R
2
5k
Ω
9
R
2
IN
R
2
OUT
10
R
2
5k
Ω
9
R
2
IN
SP310A
GND
16
18
ON/OFF
EN
1
SP312A
GND
16
18
SHUTDOWN
*The negative terminal of the V+ storage capacitor can be tied
to either V
CC
or GND. Connecting the capacitor to V
CC
(+5V)
is recommended.
*The negative terminal of the V+ storage capacitor can be tied
to either V
CC
or GND. Connecting the capacitor to V
CC
(+5V)
is recommended.
Figure 3. Typical Circuits using the SP310A and SP312A
Date: 10/17/ 05
SP232A Series Enhanced RS232 Transceivers
© Copyright 2005 Sipex Corporation
5
RS-232 INPUTS
R
1
OUT
13
14
TTL/CMOS OUTPUTS
R
1
IN
13
14
RS-232 OUTPUTS
RS-232 INPUTS
3
R
1
4
3
4
RS-232 OUTPUTS
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