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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
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ICL3221, ICL3222, ICL3223, ICL3232, ICL3241, ICL3243
Interconnection with 3V and 5V Logic
The ICL32XX directly interface with 5V CMOS and TTL logic
families. Nevertheless, with the ICL32XX at 3.3V, and the
logic supply at 5V, AC, HC, and CD4000 outputs can drive
ICL32XX inputs, but ICL32XX outputs do not reach the
minimum VIH for these logic families. See Table 4 for more
information.
TABLE 4. LOGIC FAMILY COMPATIBILITY WITH VARIOUS
SUPPLY VOLTAGES
SYSTEM
POWER-SUPPLY
VOLTAGE
(V)
VCC
SUPPLY
VOLTAGE
(V)
COMPATIBILITY
3.3
3.3 Compatible with all CMOS
families.
5
5
Compatible with all TTL and
CMOS logic families.
5
3.3 Compatible with ACT and HCT
CMOS, and with TTL. ICL32XX
outputs are incompatible with AC,
HC, and CD4000 CMOS inputs.
Typical Performance Curves VCC = 3.3V, TA = 25°C
6
VOUT+
4
2
1 TRANSMITTER AT 250kbps
1 OR 2 TRANSMITTERS AT 30kbps
0
-2
-4
VOUT -
-6
0
1000
2000
3000
4000
5000
LOAD CAPACITANCE (pF)
FIGURE 13. TRANSMITTER OUTPUT VOLTAGE vs LOAD
CAPACITANCE
25
20
15
-SLEW
+SLEW
10
5
0
1000
2000
3000
4000
5000
LOAD CAPACITANCE (pF)
FIGURE 14. SLEW RATE vs LOAD CAPACITANCE
45
ICL3221
40
35
250kbps
30
25
20
120kbps
15
10
20kbps
5
0
0
1000
2000
3000
4000
LOAD CAPACITANCE (pF)
5000
FIGURE 15. SUPPLY CURRENT vs LOAD CAPACITANCE
WHEN TRANSMITTING DATA
45
ICL3222 - ICL3232
40
35
250kbps
30
25
120kbps
20
15
20kbps
10
5
0
0
1000
2000
3000
4000
LOAD CAPACITANCE (pF)
5000
FIGURE 16. SUPPLY CURRENT vs LOAD CAPACITANCE
WHEN TRANSMITTING DATA
15
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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