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SP232A Datasheet, PDF (5/16 Pages) Sipex Corporation – Enhanced RS-232 Line Drivers/Receivers
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+5V INPUT
7
VCC
T1 IN
2
400k 1
T1
5
T2 IN
1
400k 1
T2
18
R1OUT
R2OUT
Do not make
connection to
these pins
3
R1
4
5k 1
20
8 C 1+
13 C 1-
14 V+
12 V-
17 V-
R2
19
5k 1
SP233ACP
GND
GND
C 2 + 11
C 2 + 15
C 2 - 10
C 2 - 16
6
9
T 1OUT
T 2OUT
R 1IN
R 2IN
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
+5V INPUT
7
VCC
T1 IN
2
400k 1
T1
5
T2 IN
1
400k 1
T2
18
R1OUT
R2OUT
Do not make
connection to
these pins
3
R1
4
5k 1
20
13 C 1+
14 C 1-
8 V+
10 V-
17 V-
R2
19
5k 1
SP233ACT
GND
GND
C 2 + 12
C 2 + 15
C 2 - 11
C 2 - 16
6
9
T 1OUT
T 2OUT
R 1IN
R 2IN
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
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 VOL to VOH 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
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 5K1 pulldown resis-
tor to ground will commit the output of the receiver
to a high state.
+5V INPUT
10 µF 6.3+V
+5V INPUT
10 µF 6.3+V
2
0.1µ F +
C 1+
17
V CC
6.3V
4
5
C 1-
Charge Pump
0.1µ F +
C 2+
16V
6 C 2-
400k 1
T1 IN
12
T1
400k 1
T2 IN
11
T2
0.1 µF
V+
3
10V
+
*
V- 7
+ 0.1 µF
10V
15
T 1OUT
8
T 2OUT
2
0.1µ F +
C 1+
17
V CC
6.3V
4 C 1-
5
Charge Pump
0.1µ F +
C 2+
16V
6 C 2-
400k 1
T1 IN
12
T1
400k 1
T2 IN
11
T2
0.1µ F
10V
V+ 3 +
*
V- 7
+ 0.1µ F
10V
15
T 1OUT
8
T 2OUT
R1OUT
13
R2OUT
10
R1
14
R 1IN
5k 1
R2
9
R 2IN
5k 1
SP310A
18
ON/OFF
GND 16
R1OUT
13
R2OUT
10
EN
1
R1
14
R 1IN
5k 1
R2
9
R 2IN
5k 1
SP312A
18
SHUTDOWN
GND 16
*The negative terminal of the V+ storage capacitor can be tied
to either VCCor GND. Connecting the capacitor to V CC(+5V)
is recommended.
Figure 3. Typical Circuits using the SP310A and SP312A
*The negative terminal of the V+ storage capacitor can be tied
to either VCCor GND. Connecting the capacitor to V CC(+5V)
is recommended.
Jan 31-07 Rev B
SP232A/233A/310A/312A

© 2007 Sipex Corporation
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