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ICL3221CA View Datasheet(PDF) - Intersil

Part NameDescriptionManufacturer
ICL3221CA 1 Microamp Supply-Current, +3V to +5.5V, 250kbps, RS-232 Transmitters/Receivers Intersil
Intersil Intersil
ICL3221CA Datasheet PDF : 28 Pages
First Prev 11 12 13 14 15 16 17 18 19 20 Next Last
ICL3221, ICL3222, ICL3223, ICL3232, ICL3241, ICL3243
5V/DIV
FORCEOFF
T1
2V/DIV
T2
VCC = +3.3V
C1 - C4 = 0.1µF
TIME (20µs/DIV)
FIGURE 8. TRANSMITTER OUTPUTS WHEN EXITING
POWERDOWN
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 ±5V during worst
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 VCC.
for a single transmitter driving 1000pF and an RS-232 load
at 250kbps. The static transmitters were also loaded with an
RS-232 receiver.
VCC
0.1µF
+
+
C1
+
C2
C1+
VCC
V+
C1-
ICL32XX
C2+
V-
C2-
TIN
TOUT
ROUT
RIN
+
C3
+C4
1000pF
EN
5K
VCC
SHDN OR
FORCEOFF
FIGURE 10. TRANSMITTER LOOPBACK TEST CIRCUIT
5V/DIV
T1IN
6
5
4
VOUT+
3
2
VCC = 3.0V
1
T1
0
-1
T2
-2
-3
-4 VCC T3
VOUT+
ICL3241/43
VOUT -
VOUT -
-5
-6
0 1 2 3 4 5 6 7 8 9 10
LOAD CURRENT PER TRANSMITTER (mA)
FIGURE 9. TRANSMITTER OUTPUT VOLTAGE vs LOAD
CURRENT (PER TRANSMITTER, i.e., DOUBLE
CURRENT AXIS FOR TOTAL VOUT+ CURRENT)
High Data Rates
The ICL32XX maintain the RS-232 ±5V minimum transmitter
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
T1OUT
R1OUT
VCC = +3.3V
C1 - C4 = 0.1µF
5µs/DIV
FIGURE 11. LOOPBACK TEST AT 120kbps
5V/DIV.
T1IN
T1OUT
R1OUT
VCC = +3.3V
C1 - C4 = 0.1µF
2µs/DIV.
FIGURE 12. LOOPBACK TEST AT 250kbps
14
FN4805.21
March 1, 2006
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