CAUTION: Stresses above those listed in “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress only rating and operation of the
device at these or any other conditions above those indicated in the operational sections of this specification is not implied.
NOTE:
1.
θ
JA
is measured with the component mounted on an evaluation PC board in free air.
Electrical Specifications
PARAMETER
Test Conditions: V
CC
= +5V
Otherwise Specified
±
10%, T
A
= Operating Temperature Range. Test Circuit as in Figure 8 Unless
MIN
±5
-
-
2.0
TYP
±9
5
-
-
15
-
5.0
1.2
1.7
0.5
0.1
4.6
0.5
-
3
-
±10
MAX
±10
10
0.8
-
200
+30
7.0
-
2.4
1.0
0.4
-
-
30
-
-
-
UNITS
V
mA
V
V
µA
V
kΩ
V
V
V
V
V
µs
V/µs
V/µs
Ω
mA
TEST CONDITIONS
T1
OUT
and T2
OUT
Loaded with 3kΩ to
Ground
Outputs Unloaded, T
A
= 25
o
C
Transmitter Output Voltage Swing, T
OUT
Power Supply Current, I
CC
T
IN
, Input Logic Low, V
lL
T
IN
, Input Logic High, V
lH
Logic Pullup Current, I
P
RS-232 Input Voltage Range, V
IN
Receiver Input Impedance, R
IN
Receiver Input Low Threshold, V
lN
(H-L)
Receiver Input High Threshold, V
IN
(L-H)
Receiver Input Hysteresis, V
HYST
TTL/CMOS Receiver Output Voltage Low, V
OL
TTL/CMOS Receiver Output Voltage High, V
OH
Propagation Delay, t
PD
Instantaneous Slew Rate, SR
Transition Region Slew Rate, SR
T
Output Resistance, R
OUT
RS-232 Output Short Circuit Current, I
SC
NOTES:
2. Guaranteed by design.
3. See Figure 4 for definition.
T1
IN
, T2
IN
= 0V
-
-30
V
IN
=
±3V
V
CC
= 5V, T
A
= 25
o
C
V
CC
= 5V, T
A
= 25
o
C
3.0
0.8
-
0.2
I
OUT
= 3.2mA
I
OUT
= -1.0mA
RS-232 to TTL
C
L
= 10pF, R
L
= 3kΩ, T
A
= 25
o
C
(Notes 2, 3)
R
L
= 3kΩ, C
L
= 2500pF Measured
from +3V to -3V or -3V to +3V
V
CC
= V+ = V- = 0V, V
OUT
=
±2V
T1
OUT
or T2
OUT
Shorted to GND
-
3.5
-
-
-
300
-
3
FN3020.7
July 28, 2005
ICL232
Test Circuits
+4.5V TO
+5.5V INPUT
1
2
3
1µF +
C2
-
4
5
C1+
V+
C1-
C2+
C2-
V-
T2
OUT
R2
IN
V
CC
16
GND
15
T1
OUT
14
R1
IN
13
R1
OUT
12
T1
IN
11
T2
IN
10
R2
OUT
9
3kΩ
T1 OUTPUT
RS-232
±30V
INPUT
TTL/CMOS
OUTPUT
TTL/CMOS
INPUT
TTL/CMOS
INPUT
TTL/CMOS
OUTPUT
1
2
3
4
5
6
7
8
C1+
V+
C1-
C2+
C2-
V-
T2
OUT
R2
IN
V
CC
16
GND 15
T1
OUT
14
R1
IN
13
R1
OUT
12
T1
IN
11
T2
IN
10
R2
OUT
9
1µF
C3
1µF
C1
+
-
+
-
3kΩ
7
T2 OUTPUT
RS-232
±30V
INPUT
8
FIGURE 1. GENERAL TEST CIRCUIT
Typical Performance Curves
550
V+, V- SUPPLY IMPEDANCES (Ω)
500
OUTPUT VOLTAGE (|V|)
o
450 T
A
= 25 C
EXTERNAL SUPPLY LOAD
400 1kΩ BETWEEN V+ + GND
OR V- + GND
350 TRANSMITTER OUTPUT
300
250
200
150
3
4
5
6
OPEN CIRCUIT
GUARANTEED
OPERATING
RANGE
V+ SUPPLY
FIGURE 3. V+, V- OUTPUT IMPEDANCES vs V
CC
Pin Descriptions
PDIP, CERDIP
1
2
3
4
5
6
7
8
SOIC
1
2
3
4
5
6
7
8
PIN NAME
C1+
V+
C1-
C2+
C2-
V-
T2
OUT
R2
IN
DESCRIPTION
External capacitor “+” for internal voltage doubler.
Internally generated +10V (typical) supply.
External capacitor “-” for internal voltage doubler.
External capacitor “+” internal voltage inverter.
External capacitor “-” internal voltage inverter.
Internally generated -10V (typical) supply.
RS-232 Transmitter 2 output
±10V
(typical).
RS-232 Receiver 2 input, with internal 5K pulldown resistor to GND.
-
1µF C4
+
6
R
OUT
= V
IN
/I
V
IN
=
±2V
A
T2
OUT
T1
OUT
FIGURE 2. POWER-OFF SOURCE RESISTANCE
CONFIGURATION
10
9
V- SUPPLY
8
7
6
5
4
3
T
A
= 25
o
C
TRANSMITTER OUTPUTS
OPEN CIRCUIT
0
1
2
3
4
5
6
7
8
9
10
|I
LOAD
| (mA)
V- (V
CC
= 4.5V)
V- (V
CC
= 5V)
V+ (V
CC
= 5V)
V+ (V
CC
= 4.5V)
INPUT SUPPLY VOLTAGE V
CC
(V)
FIGURE 4. V+, V- OUTPUT VOLTAGES vs LOAD CURRENT
4
FN3020.7
July 28, 2005
ICL232
Pin Descriptions
PDIP, CERDIP
9
10
11
12
13
14
15
16
(Continued)
SOIC
9
10
11
12
13
14
15
16
PIN NAME
R2out
T2
IN
T1
IN
R1
OUT
R1
IN
T1
OUT
GND
V
CC
Receiver 2 TTL/CMOS output.
Transmitter 2 TTL/CMOS input, with internal 400K pullup resistor to V
CC
.
Transmitter 1 TTL/CMOS input, with internal 400K pullup resistor to V
CC
.
Receiver 1 TTL/CMOS output.
RS-232 Receiver 1 input, with internal 5K pulldown resistor to GND.
RS-232 Transmitter 1 output
±10V
(typical).
Supply Ground.
Positive Power Supply +5V
±10%
DESCRIPTION
VOLTAGE DOUBLER
S1
V
CC
+
C1
+
S2
+
V+ = 2V
CC
C3
V
CC
GND
S7
S5
VOLTAGE INVERTER
C2
+
+
S6
GND
+
-
GND
S3
C1
-
C1
S4
-
-
C2
-
C2
-
S8
C4
V- = -(V+)
RC
OSCILLATOR
FIGURE 5. DUAL CHARGE PUMP
Detailed Description
The ICL232 is a dual RS-232 transmitter/receiver powered by
a single +5V power supply which meets all ElA RS232C
specifications and features low power consumption. The
functional diagram illustrates the major elements of the
ICL232. The circuit is divided into three sections: a voltage
doubler/inverter, dual transmitters, and dual receivers Voltage
Converter.
An equivalent circuit of the dual charge pump is illustrated in
Figure 5.
The voltage quadrupler contains two charge pumps which use
two phases of an internally generated clock to generate +10V
and -10V. The nominal clock frequency is 16kHz. During
phase one of the clock, capacitor C1 is charged to V
CC
.
During phase two, the voltage on C1 is added to V
CC
,
producing a signal across C2 equal to twice V
CC
. At the same
time, C3 is also charged to 2V
CC
, and then during phase one,
it is inverted with respect to ground to produce a signal across
C4 equal to -2V
CC
. The voltage converter accepts input
voltages up to 5.5V. The output impedance of the doubler (V+)
is approximately 200Ω, and the output impedance of the
inverter (V-) is approximately 450Ω. Typical graphs are
presented which show the voltage converters output vs input
voltage and output voltages vs load characteristics. The test
circuit (Figure 3) uses 1µF capacitors for C1-C4, however, the
value is not critical. Increasing the values of C1 and C2 will
lower the output impedance of the voltage doubler and
inverter, and increasing the values of the reservoir capacitors,
C3 and C4, lowers the ripple on the V+ and V- supplies.
T1
IN
, T2
IN
T1
OUT
, T2
OUT
t
f
90%
10%
t
r
V
OH
V
OL
(0.8) (V
OH
- V
OL
)
(0.8) (V
OL
- V
OH
)
Instantaneous
=
or
Slew Rate (SR)
t
r
t
f
FIGURE 6. SLEW RATE DEFINITION
Transmitters
The transmitters are TTL/CMOS compatible inverters which
translate the inputs to RS-232 outputs. The input logic
threshold is about 26% of V
CC
, or 1.3V for V
CC
= 5V. A logic
1 at the input results in a voltage of between -5V and V- at the
output, and a logic 0 results in a voltage between +5V and (V+
- 0.6V). Each transmitter input has an internal 400kΩ pullup
resistor so any unused input can be left unconnected and its
output remains in its low state. The output voltage swing
meets the RS-232C specification of
±5V
minimum with the
worst case conditions of: both transmitters driving 3kΩ
minimum load impedance, V
CC
= 4.5V, and maximum
allowable operating temperature. The transmitters have an
internally limited output slew rate which is less than 30V/µs.
The outputs are short circuit protected and can be shorted to
ground indefinitely. The powered down output impedance is a
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