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ICL3221CA View Datasheet(PDF) - Intersil

Part NameICL3221CA Intersil
Intersil Intersil
Description1 Microamp Supply-Current, +3V to +5.5V, 250kbps, RS-232 Transmitters/Receivers
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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One Microamp Supply-Current, +3V to +5.5V, 250kbps, RS-232 Transmitters/Receivers


The Intersil ICL32XX devices are 3.0V to 5.5V powered RS-232 transmitters/receivers which meet ElA/TIA-232 and V.28/V.24 specifications, even at VCC= 3.0V. Targeted applications are PDAs, Palmtops, and notebook and laptop computers where the low operational, and even lower standby, power consumption is critical. Efficient on-chip charge pumps, coupled with manual and automatic powerdown functions (except for the ICL3232), reduce the standby supply current to a 1µA trickle. Small footprint packaging, and the use of small, low value capacitors ensure board space savings as well. Data rates greater than 250kbps are guaranteed at worst case load onditions. This family is fully compatible with3.3V only systems, mixed 3.3V and 5.0V systems, and 5.0V only systems.

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