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PDF ICL3232 Data sheet ( Hoja de datos )

Número de pieza ICL3232
Descripción 1 Microamp Supply-Current/ +3V to +5.5V/ 250kbps/ RS-232 Transmitters/Receivers
Fabricantes Intersil 
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No Preview Available ! ICL3232 Hoja de datos, Descripción, Manual

®
Data Sheet
ICL3224, ICL3226, ICL3238, ICL3244
November 2002
FN4876.6
1 Microamp, +3V to +5.5V, 250kbps,
RS-232 Transceivers with Enhanced
Automatic Powerdown
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 enhanced
automatic powerdown functions, 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 conditions. This family is fully
compatible with 3.3V only systems, mixed 3.3V and 5.0V
systems, and 5.0V only systems.
The ICL3244 is a 3 driver, 5 receiver device that provides a
complete serial port suitable for laptop or notebook
computers. The ICL3244/38 also include a noninverting
always-active receiver for RING INDICATOR monitoring.
These devices feature an enhanced automatic
powerdown function which powers down the on-chip power-
supply and driver circuits. This occurs when all receiver and
transmitter inputs detect no signal transitions for a period of
30sec. These devices power back up, automatically,
whenever they sense a transition on any transmitter or
receiver input.
Table 1 summarizes the features of the devices represented
by this data sheet, while Application Note AN9863
summarizes the features of each device comprising the
ICL32XX 3V family.
Features
±15kV ESD Protected (Human Body Model)
• Manual and Enhanced Automatic Powerdown Features
• Drop in Replacements for MAX3224, MAX3226,
MAX3238, MAX3244
• Meets EIA/TIA-232 and V.28/V.24 Specifications at 3V
• Latch-Up Free
• RS-232 Compatible with VCC = 2.7V
• On-Chip Voltage Converters Require Only Four External
0.1µF Capacitors
• Flow-Through Pinout (ICL3238)
• Guaranteed Mouse Driveability (ICL3244)
• “Ready to Transmit” Indicator Output (ICL3224/26)
• Receiver Hysteresis For Improved Noise Immunity
• Guaranteed Minimum Data Rate . . . . . . . . . . . . . 250kbps
• Guaranteed Minimum Slew Rate . . . . . . . . . . . . . . . 6V/µs
• Wide Power Supply Range . . . . . . . Single +3V to +5.5V
• Low Supply Current in Powerdown State. . . . . . . . . . .1µA
Applications
• Any System Requiring RS-232 Communication Ports
- Battery Powered, Hand-Held, and Portable Equipment
- Laptop Computers, Notebooks, Palmtops
- Modems, Printers and other Peripherals
- Digital Cameras
- Cellular/Mobile Phones
- Data Cradles
Related Literature
• Technical Brief TB363 “Guidelines for Handling and
Processing Moisture Sensitive Surface Mount Devices
(SMDs)”
• AN9863, “3V to +5.5V, 250k-1Mbps, RS-232
Transmitters/Receivers”
PART
NUMBER
ICL3224
ICL3226
ICL3238
ICL3244
NO. OF NO. OF
Tx. Rx.
22
11
53
35
TABLE 1. SUMMARY OF FEATURES
NO. OF
MONITOR Rx.
(ROUTB)
0
DATA
RATE
(kbps)
250
Rx. ENABLE
FUNCTION?
NO
READY
OUTPUT?
YES
0
250 NO
YES
1
250 NO
NO
1
250 NO
NO
MANUAL
POWER-
DOWN?
YES
YES
YES
YES
ENHANCED
AUTOMATIC
POWERDOWN
YES
YES
YES
YES
1 CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 321-724-7143 | Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright © Intersil Americas Inc. 2002. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.

1 page




ICL3232 pdf
ICL3224, ICL3226, ICL3238, ICL3244
Absolute Maximum Ratings
VCC to Ground . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to 6V
V+ to Ground . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to 7V
V- to Ground . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +0.3V to -7V
V+ to V- . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14V
Input Voltages
TIN, FORCEOFF, FORCEON . . . . . . . . . . . . . . . . . . -0.3V to 6V
RIN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±25V
Output Voltages
TOUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±13.2V
ROUT, INVALID, READY . . . . . . . . . . . . . . . . -0.3V to VCC +0.3V
Short Circuit Duration
TOUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Continuous
ESD Rating . . . . . . . . . . . . . . . . . . . . . . . . . See Specification Table
Thermal Information
Thermal Resistance (Typical, Note 4)
θJA (oC/W)
20 Ld PDIP Package . . . . . . . . . . . . . . . . . . . . . . . .
80
28 Ld SOIC Package . . . . . . . . . . . . . . . . . . . . . . . .
75
16 Ld SSOP Package . . . . . . . . . . . . . . . . . . . . . . .
140
20 Ld SSOP Package . . . . . . . . . . . . . . . . . . . . . . .
125
28 Ld SSOP and TSSOP Packages . . . . . . . . . . . .
100
Moisture Sensitivity (see Technical Brief TB363)
All Packages Not Listed Below . . . . . . . . . . . . . . . . . . . . . Level 1
16 Ld SSOP Package . . . . . . . . . . . . . . . . . . . . . . . . . . . . Level 2
Maximum Junction Temperature (Plastic Package) . . . . . . . 150oC
Maximum Storage Temperature Range . . . . . . . . . -65oC to 150oC
Maximum Lead Temperature (Soldering 10s) . . . . . . . . . . . . 300oC
(SOIC, SSOP, TSSOP - Lead Tips Only)
Operating Conditions
Temperature Range
ICL32XXC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0oC to 70oC
ICL32XXI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -40oC to 85oC
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:
4. θJA is measured with the component mounted on a low effective thermal conductivity test board in free air. See Tech Brief TB379 for details.
Electrical Specifications
Test Conditions: VCC = 3V to
Otherwise Specified. Typicals
5.5V, C1 -
are at TA
=C245=oC0.1µF
(ICL3238:
C1
-
C4
=
0.22µF
@
VCC
=
3V);
Unless
PARAMETER
TEST CONDITIONS
TEMP
(oC)
MIN
TYP
MAX UNITS
DC CHARACTERISTICS
Supply Current, Automatic
Powerdown
All RIN Open, FORCEON = GND, FORCEOFF = VCC
25 - 1.0 10 µA
Supply Current, Powerdown
FORCEOFF = GND
25 - 1.0 10 µA
Supply Current,
All Outputs Unloaded, FORCEON ICL3244, VCC = 3V
25 - 0.3 1.0 mA
Automatic Powerdown Disabled = FORCEOFF = VCC
All Others, VCC = 3.15V 25 - 0.3 1.0 mA
LOGIC AND TRANSMITTER INPUTS AND RECEIVER OUTPUTS
Input Logic Threshold Low
Input Logic Threshold High
Transmitter Input Hysteresis
TIN, FORCEON, FORCEOFF
TIN, FORCEON, FORCEOFF
VCC = 3.3V
VCC = 5.0V
Full -
- 0.8 V
Full 2.0
-
-V
Full 2.4
-
-V
25 - 0.5 - V
Input Leakage Current
Output Leakage Current
TIN, FORCEON, FORCEOFF
FORCEOFF = GND
Full - ±0.01 ±1.0 µA
Full
-
±0.05
±10
µA
Output Voltage Low
Output Voltage High
RECEIVER INPUTS
IOUT = 1.6mA
IOUT = -1.0mA
Full -
-
Full VCC -0.6 VCC -0.1
0.4
-
V
V
Input Voltage Range
Full -25 - 25 V
Input Threshold Low
Input Threshold High
Input Hysteresis
VCC = 3.3V
VCC = 5.0V
VCC = 3.3V
VCC = 5.0V
25 0.6 1.2 - V
25 0.8 1.5 - V
25 - 1.5 2.4 V
25 - 1.8 2.4 V
25 - 0.5 - V
Input Resistance
25 3 5 7 k
TRANSMITTER OUTPUTS
Output Voltage Swing
All Transmitter Outputs Loaded with 3kto Ground
Full ±5.0 ±5.4
-
V
5

5 Page





ICL3232 arduino
ICL3224, ICL3226, ICL3238, ICL3244
reattached, connect FORCEON to FORCEOFF through a
network similar to that shown in Figure 5.
Ready Output (ICL3224 and ICL3226 only)
The Ready output indicates that the ICL322X is ready to
transmit. Ready switches low whenever the device enters
powerdown, and switches back high during power-up when
V- reaches -4V or lower.
Capacitor Selection
The charge pumps require 0.1µF capacitors for 3.3V
operation. For other supply voltages refer to Table 3 for
capacitor values. Do not use values smaller than those listed
in Table 3. Increasing the capacitor values (by a factor of 2)
reduces ripple on the transmitter outputs and slightly
reduces power consumption. C2, C3, and C4 can be
increased without increasing C1’s value, however, do not
increase C1 without also increasing C2, C3, and C4 to
maintain the proper ratios (C1 to the other capacitors).
When using minimum required capacitor values, make sure
that capacitor values do not degrade excessively with
temperature. If in doubt, use capacitors with a larger nominal
value. The capacitor’s equivalent series resistance (ESR)
usually rises at low temperatures and it influences the
amount of ripple on V+ and V-.
TABLE 3. REQUIRED CAPACITOR VALUES (Note 8)
VCC (V)
3.0 to 3.6 (3.3V ±10%)
C1 (µF)
0.1 (0.22)
C2, C3, C4 (µF)
0.1 (0.22)
3.15 to 3.6 (3.3V ±5%)
(0.1)
(0.1)
4.5 to 5.5
0.047
0.33
3.0 to 5.5
0.1 (0.22)
0.47 (1.0)
NOTE:
8. Parenthesized values apply only to the ICL3238
Power Supply Decoupling
In most circumstances a 0.1µF bypass capacitor is
adequate. In applications that are particularly sensitive to
power supply noise, decouple VCC to ground with a
capacitor of the same value as the charge-pump capacitor C1.
Connect the bypass capacitor as close as possible to the IC.
Transmitter Outputs when Exiting
Powerdown
Figure 10 shows the response of two transmitter outputs
when exiting powerdown mode. As they activate, the two
transmitter outputs properly go to opposite RS-232 levels,
with no glitching, ringing, nor undesirable transients. Each
transmitter is loaded with 3kin parallel with 2500pF. Note
that the transmitters enable only when the magnitude of the
supplies exceed approximately 3V.
Operation Down to 2.7V
ICL32XX transmitter outputs meet RS-562 levels (±3.7V), at
the full data rate, with VCC as low as 2.7V. RS-562 levels
typically ensure interoperability with RS-232 devices.
Mouse Driveability
The ICL3244 is specifically designed to power a serial
mouse while operating from low voltage supplies. Figure 11
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).
5V/DIV
FORCEOFF
2V/DIV
T1
VCC = +3.3V
C1 - C4 = 0.1µF
T2
5V/DIV
READY
TIME (20µs/DIV.)
FIGURE 10. TRANSMITTER OUTPUTS WHEN EXITING
POWERDOWN
6
5
4 VOUT+
3
2 VCC = 3.0V
1 T1
0
-1
T2
-2
-3
-4 VCC T3
VOUT+
ICL3244
VOUT -
VOUT -
-5
-6
0 12 34 56 78 9
LOAD CURRENT PER TRANSMITTER (mA)
10
FIGURE 11. 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 12 details a
transmitter loopback test circuit, and Figure 13 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 14 shows the loopback results
11

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