Datasheet
ICL3224, ICL3226, ICL3238
1µA, +3V to +5.5V, 250kbps, RS-232 Transceivers with Enhanced Automatic
Powerdown
The
ICL3224, ICL3226,
and
ICL3238
(ICL32xx)
devices are 3.0V to 5.5V powered RS-232
transmitters/receivers that meet ElA/TIA-232 and
V.28/V.24 specifications, even at V
CC
= 3.0V.
Targeted applications are PDAs, Palmtops, and
notebook and laptop computers where low
operational power consumption and even lower
standby power consumption are 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. Data rates
greater than 250kbps are ensured 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 ICL3238 is a 5 driver, 3 receiver device that
includes a noninverting always-active receiver for
Ring Indicator monitoring.
The ICL32xx devices feature an enhanced automatic
powerdown function that powers down the on-chip
power supply and driver circuits. Powerdown occurs
when all receiver and transmitter inputs detect no
signal transitions for a period of 30s. 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 datasheet, and
AN9863
summarizes the features of each device in the
ICL32xx 3V family.
Features
• Pb-free (RoHS compliant)
• ±15kV ESD protected (human body model)
• Manual and enhanced automatic powerdown
features
• Drop in replacements for MAX3224, MAX3226,
MAX3238
• Meets EIA/TIA-232 and V.28/V.24 specifications
at 3V
• Latch-up free
• RS-232 compatible with V
CC
= 2.7V
• On-chip voltage converters require only four
external 0.1µF capacitors
• Flow-through pinout (ICL3238)
• “Ready to transmit” indicator output (ICL3224/26)
• Receiver hysteresis for improved noise immunity
• Ensured minimum data rate: 250kbps
• Ensured 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
For a full list of related documents, visit our website:
ICL3224, ICL3226,
and
ICL3238
device pages
Table 1.
Summary of Features
Number Number
of Tx.
of Rx.
2
1
5
2
1
3
Number of
Monitor Rx.
(R
OUTB
)
0
0
1
Data Rate
(kbps)
250
250
250
Rx. Enable
Function?
No
No
No
READY
Output?
Yes
Yes
No
Manual
Powerdown?
Yes
Yes
Yes
Enhanced
Automatic
Powerdown
Yes
Yes
Yes
Part Number
ICL3224
ICL3226
ICL3238
FN4876 Rev.11.00
May.29.19
Page 1 of 27
ICL3224, ICL3226, ICL3238
Contents
1.
1.1
1.2
1.3
1.4
2.
2.1
2.2
2.3
2.4
3.
4.
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Typical Operating Circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Ordering Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Pin Configurations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Pin Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3
4
5
6
Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Absolute Maximum Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Thermal Information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Recommended Operating Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Electrical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7
7
7
8
Typical Performance Curves. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Application Information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
4.1
4.1.1
4.2
4.3
4.4
4.4.1
4.4.2
4.5
4.5.1
4.5.2
4.6
4.7
4.8
4.9
4.10
4.11
4.12
Charge-Pump . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Charge Pump Absolute Maximum Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Transmitters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Receivers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Powerdown Functionality . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Software Controlled (Manual) Powerdown . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
INVALID Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Enhanced Automatic Powerdown . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Emulating Standard Automatic Powerdown. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Hybrid Automatic Powerdown Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
READY Output (ICL3224 and ICL3226 only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Capacitor Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power Supply Decoupling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Transmitter Outputs when Exiting Powerdown . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operation Down to 2.7V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
High Data Rates . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Interconnection with 3V and 5V Logic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
12
12
13
14
15
16
17
17
18
19
19
19
19
20
20
20
21
5.
6.
7.
Die Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Revision History. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Package Outline Drawings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
FN4876 Rev.11.00
May.29.19
Page 2 of 27
ICL3224, ICL3226, ICL3238
1. Overview
1.
1.1
Overview
Typical Operating Circuits
ICL3224
+3.3V
+
0.1µF
2
+
4
5
+
6
13
T1
IN
12
T2
IN
15
R1
OUT
10
R2
OUT
1
14
R
2
READY
FORCEON
GND
18
5kΩ
20
11
R
1
5kΩ
9
R2
IN
12
16
R1
IN
C1+
C1-
C2+
C2-
T
1
T
2
+3.3V
19
V
CC
V+
3
+ C
3
0.1µF
C
4
0.1µF
+
T1
OUT
8
T2
OUT
RS-232
Levels
C
1
0.1µF
C
2
0.1µF
+
0.1µF
ICL3226
15
V
CC
V+
3
+ C
3
0.1µF
C
4
C
1
0.1µF
C
2
0.1µF
V- 7
17
2
+ C1+
4
C1-
5
+ C2+
6
C2-
11
V- 7
T
1
13
+ 0.1µF
T1
OUT
TTL/CMOS
Logic
Levels
TTL/CMOS
Logic
Levels
T1
IN
9
R1
OUT
1
READY
FORCEOFF
FORCEON
GND
14
INVALID
R
1
5kΩ
8
RS-232
Levels
R1
IN
16
10
V
CC
To Power
Control
Logic
FORCEOFF
INVALID
V
CC
To Power
Control
Logic
FN4876 Rev.11.00
May.29.19
Page 3 of 27
ICL3224, ICL3226, ICL3238
ICL3238
+3.3V
C
3
(Optional
Connection,
Note 1
26
V
CC
27
V+
4
+
C
3
0.1µF
+
+
0.1µF
28
+
25
1
+
3
24
T1
IN
23
T2
IN
22
T3
IN
19
T4
IN
17
TTL/CMOS
Logic
Levels
T5
IN
16
R1
OUTB
21
R1
OUT
20
R2
OUT
18
R3
OUT
13
R
3
FORCEON
5kΩ
R
2
5kΩ
R
1
5kΩ
8
R1
IN
9
R2
IN
11
R3
IN
T
5
T
3
T
4
T
2
C1+
C1-
C2+
C2-
T
1
V-
1. Overview
C
1
0.1µF
Note 2
C
2
0.1µF
Note 2
C
4
0.1µF
+
5
T1
OUT
6
T2
OUT
7
T3
OUT
10
T4
OUT
12
T5
OUT
RS-232
Levels
RS-232
Levels
V
CC
To Power
Control
Logic
14
15
FORCEOFF
INVALID
GND
2
Notes:
1. The negative terminal of C3 can be connected to either VCC or GND.
2. For V
CC
= 3.15V (3.3V -5%), Use C
1
- C
4
= 0.1µF or greater. For V
CC
= 3.0V (3.3V -10%), Use C
1
- C
4
= 0.22µF.
1.2
Ordering Information
Part Number
(Notes
4, 5)
Part Marking
ICL3226IAZ
ICL3226IAZ
3224CAZ
Temp. Range (°C)
-40 to 85
-40 to 85
0 to 70
Tape and Reel
(Units) (Notes
3)
-
1k
-
Package
(RoHS Compliant)
16 Ld SSOP
16 Ld SSOP
20 Ld SSOP
Pkg.
Dwg. #
M16.209
M16.209
M20.209
ICL3226IAZ
ICL3226IAZ-T
ICL3224CAZ
(No longer
available, recommended
replacement: ICL3224EIAZ)
ICL3224CAZ-T
(No longer
available, recommended
replacement: ICL3224EIAZ-T)
3224CAZ
0 to 70
1k
20 Ld SSOP
M20.209
FN4876 Rev.11.00
May.29.19
Page 4 of 27
ICL3224, ICL3226, ICL3238
Part Number
(Notes
4, 5)
ICL3224IAZ
(No longer
available, recommended
replacement: ICL3224EIAZ)
ICL3224IAZ-T
(No longer
available, recommended
replacement: ICL3224EIAZ-T)
ICL3226CAZ
(No longer
available, recommended
replacement: ICL3226EIAZ)
ICL3226CAZ-T
(No longer
available, recommended
replacement: ICL3226EIAZ-T)
ICL3238CAZ
(No longer
available, recommended
replacement: ICL3238EIAZ)
ICL3238CAZ-T
(No longer
available, recommended
replacement: ICL3238EIAZ-T)
ICL3238IAZ
(No longer
available, recommended
replacement: ICL3238EIAZ)
ICL3238IAZ-T
(No longer
available, recommended
replacement: ICL3238EIAZ-T)
Tape and Reel
(Units) (Notes
3)
-
Package
(RoHS Compliant)
20 Ld SSOP
1. Overview
Pkg.
Dwg. #
M20.209
Part Marking
3224IAZ
Temp. Range (°C)
-40 to 85
3224IAZ
-40 to 85
1k
20 Ld SSOP
M20.209
ICL3226CAZ
0 to 70
-
16 Ld SSOP
M16.209
ICL3226CAZ
0 to 70
1k
16 Ld SSOP
M16.209
ICL3238CAZ
0 to 70
-
28 Ld SSOP
M28.209
ICL3238CAZ
0 to 70
1k
28 Ld SSOP
M28.209
ICL3238IAZ
-40 to 85
-
28 Ld SSOP
M28.209
ICL3238IAZ
-40 to 85
1k
28 Ld SSOP
M28.209
Notes:
3. See
TB347
for details about reel specifications.
4. Pb-free plus anneal products employ special Pb-free material sets; molding compounds/die attach materials and 100% matte tin plate
termination finish, which are RoHS compliant and compatible with both SnPb and Pb-free soldering operations. Pb-free products are MSL
classified at Pb-free peak reflow temperatures that meet or exceed the Pb-free requirements of IPC/JEDEC J-STD-020.
5. For Moisture Sensitivity Level (MSL), see the ICL3224, ICL3226, and ICL3238 device pages. For more information about MSL, see
TB363.
1.3
Pin Configurations
ICL3224 (SSOP)
Top View
READY 1
C1+ 2
V+
3
20 FORCEOFF
19 V
CC
18 GND
17 T1
OUT
16 R1
IN
15 R1
OUT
14 FORCEON
13 T1
IN
12 T2
IN
11 INVALID
READY 1
C1+ 2
V+
3
ICL3226 (SSOP)
Top View
16 FORCEOFF
15 V
CC
14 GND
13 T1
OUT
12 FORCEON
11 T1
IN
10 INVALID
9 R1
OUT
C1- 4
C2+ 5
C2- 6
V- 7
T2
OUT
8
R2
IN
9
R2
OUT
10
C1- 4
C2+ 5
C2- 6
V- 7
R1
IN
8
FN4876 Rev.11.00
May.29.19
Page 5 of 27
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