ICL3232IB-T Intersil, ICL3232IB-T Datasheet - Page 14

• Manufacturer Part Number: ICL3232IB-T
• Description: IC 2DRVR/2RCVR RS232 3V 16-SOIC
• Manufacturer: Intersil
• Type: Transceiverr

Specifications of ICL3232IB-T

• Number Of Drivers/receivers: 2/2
• Protocol: RS232
• Voltage - Supply: 3 V ~ 5.5 V
• Mounting Type: Surface Mount
• Package / Case: 16-SOIC (0.300", 7.5mm Width)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

Mouse Driveability
The ICL324X have been specifically designed to power a
serial mouse while operating from low voltage supplies.
Figure 9 shows the transmitter output voltages under
increasing load current. The on-chip switching regulator
ensures the transmitters will supply at least
case conditions (15mA for paralleled V+ transmitters, 7.3mA
for single V- transmitter). The Automatic Powerdown feature
does not work with a mouse, so FORCEOFF and
FORCEON should be connected to V
High Data Rates
The ICL32XX maintain the RS-232
output voltages even at high data rates. Figure 10 details a
transmitter loopback test circuit, and Figure 11 illustrates the
loopback test result at 120kbps. For this test, all transmitters
were simultaneously driving RS-232 loads in parallel with
1000pF, at 120kbps. Figure 12 shows the loopback results
5V/DIV
2V/DIV
FIGURE 9. TRANSMITTER OUTPUT VOLTAGE vs LOAD
FIGURE 8. TRANSMITTER OUTPUTS WHEN EXITING
-1
-2
-3
-4
-5
-6
6
5
4
3
2
1
0
0
V
C1 - C4 = 0.1µF
V
CC
CC
1
= +3.3V
POWERDOWN
CURRENT (PER TRANSMITTER, i.e., DOUBLE
CURRENT AXIS FOR TOTAL V
FORCEOFF
LOAD CURRENT PER TRANSMITTER (mA)
V
T1
T2
T3
CC
2
= 3.0V
3
V
ICL3241/43
V
OUT
OUT
ICL3221, ICL3222, ICL3223, ICL3232, ICL3241, ICL3243
TIME (20µs/DIV)
4
+
-
14
5
±
5V minimum transmitter
6
CC
.
7
OUT+
±
5V during worst
V
V
OUT
OUT
8
CURRENT)
+
-
T1
T2
9
10
for a single transmitter driving 1000pF and an RS-232 load
at 250kbps. The static transmitters were also loaded with an
RS-232 receiver.
5V/DIV.
5V/DIV
R1
R1
T1
T1
FIGURE 10. TRANSMITTER LOOPBACK TEST CIRCUIT
T1
T1
OUT
OUT
OUT
OUT
IN
IN
C
C
V
V
CC
CC
1
2
V
C1 - C4 = 0.1µF
V
C1 - C4 = 0.1µF
+
+
FIGURE 11. LOOPBACK TEST AT 120kbps
FIGURE 12. LOOPBACK TEST AT 250kbps
CC
CC
= +3.3V
= +3.3V
0.1µF
C1+
C1-
C2+
C2-
T
R
EN
SHDN OR
FORCEOFF
IN
OUT
+
ICL32XX
V
CC
2µs/DIV.
5µs/DIV
T
OUT
R
5K
V+
V-
IN
March 1, 2006
+
+
1000pF
C
C
FN4805.21
3
4