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 VCC = 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.
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 VCC = 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
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.
• Ensured minimum data rate: 250kbps
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.
• Any system requiring RS-232 communication ports
• Wide power supply range: Single +3V to +5.5V
• Low supply current in powerdown state: 1µA
Applications
○ Battery powered, hand-held, and portable
equipment
○ Laptop computers, Notebooks, Palmtops
○ Modems, printers and other peripherals
Related Literature
For a full list of related documents, visit our website:
ICL3224, ICL3226, and ICL3238 device pages
Table 1.
• Ensured minimum slew rate: 6V/µs
○ Digital cameras
○ Cellular/mobile phones
○ Data cradles
Summary of Features
Part Number
Number Number
of Tx.
of Rx.
Number of
Monitor Rx.
(ROUTB)
Data Rate
(kbps)
Rx. Enable
Function?
READY
Output?
Manual
Powerdown?
Enhanced
Automatic
Powerdown
ICL3224
2
2
0
250
No
Yes
Yes
Yes
ICL3226
1
1
0
250
No
Yes
Yes
Yes
ICL3238
5
3
1
250
No
No
Yes
Yes
FN4876 Rev.11.00
May.29.19
Page 1 of 27
ICL3224, ICL3226, ICL3238
Contents
1.
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1
1.2
1.3
1.4
2.
Typical Operating Circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Ordering Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Pin Configurations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Pin Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3
4
5
6
Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.1
2.2
2.3
2.4
Absolute Maximum Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Thermal Information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Recommended Operating Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Electrical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7
7
7
8
3.
Typical Performance Curves. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
4.
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.
Die Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
6.
Revision History. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
7.
Package Outline Drawings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
FN4876 Rev.11.00
May.29.19
Page 2 of 27
ICL3224, ICL3226, ICL3238
1.
1.1
1. Overview
Overview
Typical Operating Circuits
ICL3224
+3.3V
+
2
+
4
C2
0.1µF
5
+
6
C1+
VCC
V+
T1
+ C3
0.1µF
C4
0.1µF
+
T2OUT
16
RS-232
Levels
READY
FORCEOFF
INVALID
FORCEON
GND
20
11
VCC
V+
VCC
3
T1
T1OUT
8
R1OUT
12
C4
+ 0.1µF
13
9
1
+ C3
0.1µF
V- 7
5kΩ
R1
READY
FORCEOFF
R2IN
5kΩ
R2
15
T1IN
9
R2OUT
14
R1IN
5kΩ
10
1
TTL/CMOS
Logic
Levels
8
15
R1
C2
0.1µF
0.1µF
2
+ C1+
4
C15
+ C2+
6
C211
T1OUT
T2IN
R1OUT
C1
0.1µF
17
T2
12
3
V- 7
C2-
T1IN
+
19
C1C2+
13
TTL/CMOS
Logic
Levels
+3.3V
0.1µF
C1
0.1µF
ICL3226
FORCEON
GND
INVALID
RS-232
Levels
R1IN
16
10
VCC
To Power
Control
Logic
14
To Power
Control
Logic
18
FN4876 Rev.11.00
May.29.19
Page 3 of 27
ICL3224, ICL3226, ICL3238
1. Overview
ICL3238
C3 (Optional
Connection, Note 1
+
C1
0.1µF
Note 2
0.1µF
28
+
+
+3.3V
26
C1+
27
VCC
C11
C2+
+
3
C2-
C2
0.1µF
VT1
24
C3
0.1µF
Note 2
C4
0.1µF
+
4
5
T1IN
T1OUT
T2
23
6
T2IN
T2OUT
T3
22
T3IN
7
T3OUT
T4
19
RS-232
Levels
10
T4OUT
T4IN
T5
17
12
T5IN
TTL/CMOS
Logic
Levels
+
V+
25
T5OUT
16
R1OUTB
21
8
R1OUT
R1
5kΩ
20
9
R2OUT
R2
5kΩ
18
VCC
R3
To Power
Control
Logic
14
15
R2IN
RS-232
Levels
11
R3OUT
13
R1IN
5kΩ
R3IN
FORCEON
FORCEOFF
INVALID
GND
2
Notes:
1. The negative terminal of C3 can be connected to either VCC or GND.
2. For VCC = 3.15V (3.3V -5%), Use C1 - C4 = 0.1µF or greater. For VCC = 3.0V (3.3V -10%), Use C1 - C4 = 0.22µF.
1.2
Ordering Information
Part Number
(Notes 4, 5)
Part Marking
Temp. Range (°C)
Tape and Reel
(Units) (Notes 3)
Package
(RoHS Compliant)
Pkg.
Dwg. #
ICL3226IAZ
ICL3226IAZ
-40 to 85
-
16 Ld SSOP
M16.209
ICL3226IAZ-T
ICL3226IAZ
-40 to 85
1k
16 Ld SSOP
M16.209
ICL3224CAZ (No longer
available, recommended
replacement: ICL3224EIAZ)
3224CAZ
0 to 70
-
20 Ld SSOP
M20.209
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)
1. Overview
Part Marking
Temp. Range (°C)
Tape and Reel
(Units) (Notes 3)
Package
(RoHS Compliant)
Pkg.
Dwg. #
ICL3224IAZ (No longer
available, recommended
replacement: ICL3224EIAZ)
3224IAZ
-40 to 85
-
20 Ld SSOP
M20.209
ICL3224IAZ-T (No longer
available, recommended
replacement: ICL3224EIAZ-T)
3224IAZ
-40 to 85
1k
20 Ld SSOP
M20.209
ICL3226CAZ (No longer
available, recommended
replacement: ICL3226EIAZ)
ICL3226CAZ
0 to 70
-
16 Ld SSOP
M16.209
ICL3226CAZ-T (No longer
available, recommended
replacement: ICL3226EIAZ-T)
ICL3226CAZ
0 to 70
1k
16 Ld SSOP
M16.209
ICL3238CAZ (No longer
available, recommended
replacement: ICL3238EIAZ)
ICL3238CAZ
0 to 70
-
28 Ld SSOP
M28.209
ICL3238CAZ-T (No longer
available, recommended
replacement: ICL3238EIAZ-T)
ICL3238CAZ
0 to 70
1k
28 Ld SSOP
M28.209
ICL3238IAZ (No longer
available, recommended
replacement: ICL3238EIAZ)
ICL3238IAZ
-40 to 85
-
28 Ld SSOP
M28.209
ICL3238IAZ-T (No longer
available, recommended
replacement: ICL3238EIAZ-T)
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
20 FORCEOFF
ICL3226 (SSOP)
Top View
READY 1
16 FORCEOFF
19 VCC
C1+ 2
18 GND
V+
C1- 4
17 T1OUT
C1- 4
13 T1OUT
C2+ 5
16 R1IN
C2+ 5
12 FORCEON
C2- 6
15 R1OUT
C2- 6
11 T1IN
C1+ 2
V+
3
V- 7
14 FORCEON
T2OUT 8
13 T1IN
R2IN 9
12 T2IN
R2OUT 10
FN4876 Rev.11.00
May.29.19
3
V- 7
R1IN 8
15 VCC
14 GND
10 INVALID
9 R1OUT
11 INVALID
Page 5 of 27
ICL3224, ICL3226, ICL3238
1. Overview
ICL3238 (SSOP)
Top View
28 C1+
C2+ 1
27 V+
GND 2
3
26 VCC
V- 4
25 C1-
C2-
T1OUT 5
24 T1IN
T2OUT 6
23 T2IN
T3OUT 7
22 T3IN
R1IN 8
21 R1OUT
R2IN 9
20 R2OUT
19 T4IN
T4OUT 10
18 R3OUT
R3IN 11
17 T5IN
T5OUT 12
1.4
FORCEON 13
16 R1OUTB
FORCEOFF 14
15 INVALID
Pin Descriptions
Pin
Function
VCC
System power supply input (3.0V to 5.5V).
V+
Internally generated positive transmitter supply (+5.5V).
V-
Internally generated negative transmitter supply (-5.5V).
GND
Ground connection.
C1+
External capacitor (voltage doubler) is connected to this lead.
C1-
External capacitor (voltage doubler) is connected to this lead.
C2+
External capacitor (voltage inverter) is connected to this lead.
C2-
External capacitor (voltage inverter) is connected to this lead.
TxIN
TTL/CMOS compatible transmitter Inputs.
TxOUT
RS-232 level (nominally ±5.5V) transmitter outputs.
RxIN
RS-232 compatible receiver inputs.
RxOUT
TTL/CMOS level receiver outputs.
RxOUTB
TTL/CMOS level, noninverting, always enabled receiver outputs.
INVALID
Active low output that indicates if no valid RS-232 levels are present on any receiver input.
READY
Active high output that indicates when the ICL32xx is ready to transmit (V- ≤ -4V)
FORCEOFF Active low to shut down transmitters and on-chip power supply, which overrides any automatic circuitry and FORCEON (see
Table 5 on page 15).
FORCEON
Active high input to override automatic powerdown circuitry and keeps transmitters active. (FORCEOFF must be high).
FN4876 Rev.11.00
May.29.19
Page 6 of 27
ICL3224, ICL3226, ICL3238
2.
2. Specifications
Specifications
2.1
Absolute Maximum Ratings
Parameter
Minimum
Maximum
Unit
VCC to Ground
-0.3
6
V
V+ to Ground
-0.3
7
V
V- to Ground
+0.3
-7
V
14
V
6
V
±25
V
±13.2
V
VCC +0.3
V
V+ to VInput Voltages
TIN, FORCEOFF, FORCEON
-0.3
RIN
Output Voltages
TOUT
ROUT, INVALID, READY
-0.3
Short-Circuit Duration
TOUT
Continuous
ESD Rating
See “ESD Performance” on page 9
CAUTION: Do not operate at or near the maximum ratings listed for extended periods of time. Exposure to such conditions can adversely
impact product reliability and result in failures not covered by warranty.
2.2
Thermal Information
Thermal Resistance (Typical, Note 6)
θJA (°C/W)
16 Ld SSOP Package
140
20 Ld SSOP Package
125
28 Ld SSOP Package
100
Notes:
6. θJA is measured with the component mounted on a low-effective thermal conductivity test board in free air. See TB379.
Parameter
Minimum
Maximum Junction Temperature (Plastic Package)
Maximum Storage Temperature Range
-65
Pb-Free Reflow Profile
2.3
Maximum
Unit
+150
°C
+150
°C
see TB493
Recommended Operating Conditions
Parameter
Minimum
Maximum
Unit
ICL32xxC
0
+70
°C
ICL32xxI
-40
+85
°C
Temperature Range
FN4876 Rev.11.00
May.29.19
Page 7 of 27
ICL3224, ICL3226, ICL3238
2.4
2. Specifications
Electrical Specifications
Test conditions: VCC = 3V to 5.5V, C1 - C4 = 0.1µF (ICL3238: C1 - C4 = 0.22µF at VCC = 3V); unless otherwise specified. Typical values are at
TA = 25°C
Parameter
Test Conditions
Temp (°C)
Min
Typ
Max Unit
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,
Automatic Powerdown Disabled
All outputs unloaded, FORCEON = FORCEOFF = VCC
VCC = 3.15V
25
-
0.3
1.0
mA
Full
-
-
0.8
V
VCC = 3.3V
Full
2.0
-
-
V
VCC = 5.0V
Full
2.4
-
-
V
25
-
0.5
-
V
Logic and Transmitter Inputs and Receiver Outputs
Input Logic Threshold Low
TIN, FORCEON, FORCEOFF
Input Logic Threshold High
TIN, FORCEON, FORCEOFF
Transmitter Input Hysteresis
Input Leakage Current
TIN, FORCEON, FORCEOFF
Full
-
±0.01
±1.0
µA
Output Leakage Current
FORCEOFF = GND
Full
-
±0.05
±10
µA
Output Voltage Low
IOUT = 1.6mA
Full
-
-
0.4
V
Output Voltage High
IOUT = -1.0mA
Full
-
V
VCC -0.6 VCC -0.1
Receiver Inputs
Input Voltage Range
Full
-25
-
25
V
VCC = 3.3V
25
0.6
1.2
-
V
VCC = 5.0V
25
0.8
1.5
-
V
VCC = 3.3V
25
-
1.5
2.4
V
VCC = 5.0V
25
-
1.8
2.4
V
Input Hysteresis
25
-
0.5
-
V
Input Resistance
25
3
5
7
kΩ
Input Threshold Low
Input Threshold High
Transmitter Outputs
Output Voltage Swing
All transmitter outputs loaded with 3kΩ to ground
Full
±5.0
±5.4
-
V
Output Resistance
VCC = V+ = V- = 0V, transmitter output = ±2V
Full
300
10M
-
Ω
Full
-
±35
±60
mA
Full
-
-
±25
µA
Output Short-Circuit Current
Output Leakage Current
VOUT = ±12V, VCC = 0V or 3V to 5.5V, automatic
powerdown or FORCEOFF = GND
Enhanced Automatic Powerdown (FORCEON = GND, FORCEOFF = VCC)
Receiver Input Thresholds to
INVALID High
See Figure 13
Full
-2.7
-
2.7
V
Receiver Input Thresholds to
INVALID Low
See Figure 13
Full
-0.3
-
0.3
V
INVALID, READY Output Voltage
Low
IOUT = 1.6mA
Full
-
-
0.4
V
INVALID, READY Output Voltage
High
IOUT = -1.0mA
Full
VCC-0.6
-
-
V
Receiver Positive or Negative
Threshold to INVALID High Delay
(tINVH)
ICL3238
25
-
0.1
-
µs
All Others
25
-
1
-
µs
Receiver Positive or Negative
Threshold to INVALID Low Delay
(tINVL)
ICL3238
25
-
50
-
µs
All Others
25
-
30
-
µs
FN4876 Rev.11.00
May.29.19
Page 8 of 27
ICL3224, ICL3226, ICL3238
2. Specifications
Test conditions: VCC = 3V to 5.5V, C1 - C4 = 0.1µF (ICL3238: C1 - C4 = 0.22µF at VCC = 3V); unless otherwise specified. Typical values are at
TA = 25°C (Continued)
Parameter
Test Conditions
Temp (°C)
Min
Typ
25
-
25
-
µs
25
-
100
-
µs
Note 7
Full
15
30
60
sec
Maximum Data Rate
RL = 3kΩ, CL = 1000pF, one transmitter switching
Full
250
500
-
kbps
Receiver Propagation Delay
Receiver input to receiver
output, CL = 150pF
tPHL
25
-
0.15
-
µs
tPLH
25
-
0.15
-
µs
Receiver or Transmitter Edge to
ICL3238, Note 7
Transmitters Enabled Delay (tWU)
All Others, Note 7
Receiver or Transmitter Edge to
Transmitters Disabled Delay
(tAUTOPWDN)
Max Unit
Timing Characteristics
Receiver Output Enable Time
Normal operation (ICL3238 Only)
25
-
200
-
ns
Receiver Output Disable Time
Normal operation (ICL3238 Only)
25
-
200
-
ns
Transmitter Skew
tPHL - tPLH
25
-
100
-
ns
Receiver Skew
tPHL - tPLH
25
-
50
-
ns
Transition Region Slew Rate
CL = 150pF to 1000pF
VCC = 3.3V,
RL = 3kΩ to 7kΩ,
Measured From 3V to -3V or -3V CL = 150pF to 2500pF
to 3V
25
6
-
30
V/µs
25
4
8
30
V/µs
Human Body Model
25
-
±15
-
kV
IEC61000-4-2 Contact Discharge
25
-
±8
-
kV
IEC61000-4-2 Air Gap Discharge
25
-
±10
-
kV
Human Body Model
25
-
±2.5
-
kV
ESD Performance
RS-232 Pins (TOUT, RIN)
All Other Pins
Note:
7. An “edge” is defined as a transition through the transmitter or receiver input thresholds.
FN4876 Rev.11.00
May.29.19
Page 9 of 27
ICL3224, ICL3226, ICL3238
3.
3. Typical Performance Curves
Typical Performance Curves
VCC = 3.3V, TA = 25°C
6
6
VOUT+
Transmitter Output Voltage (V)
Transmitter Output Voltage (V)
VOUT+
4
ICL3224, ICL3226
2
1 Transmitter at 250kbps
Other Transmitters at 30kbps
0
-2
-4
-6
VOUT -
0
1000
2000
3000
4000
4
ICL3238
2
0
-2
VOUT -
-4
-6
5000
1 Transmitter at 250kbps
Other Transmitters at 30kbps
0
1000
3000
4000
5000
Load Capacitance (pF)
Load Capacitance (pF)
Figure 2. Transmitter Output Voltage vs Load
Capacitance
Figure 1. Transmitter Output Voltage vs Load
Capacitance
25
40
ICL3224
35
250kbps
20
-SLEW
Supply Current (mA)
Slew Rate (V/µs)
2000
15
+SLEW
10
30
25
120kbps
20
15
20kbps
10
5
0
1000
2000
3000
4000
5
5000
0
1000
Load Capacitance (pF)
2000
3000
4000
5000
Load Capacitance (pF)
Figure 3. Slew Rate vs Load Capacitance
Figure 4. Supply Current vs Load Capacitance When
Transmitting Data
55
35
ICL3238
ICL3226
50
250kbps
25
20
Supply Current (mA)
Supply Current (mA)
30
120kbps
15
10
20kbps
5
45
250kbps
40
120kbps
35
30
25
0
0
1000
2000
3000
4000
5000
Load Capacitance (pF)
Figure 5. Supply Current vs Load Capacitance When
Transmitting Data
FN4876 Rev.11.00
May.29.19
20kbps
20
0
1000
2000
3000
4000
5000
Load Capacitance (pF)
Figure 6. Supply Current vs Load Capacitance When
Transmitting Data
Page 10 of 27
ICL3224, ICL3226, ICL3238
3. Typical Performance Curves
VCC = 3.3V, TA = 25°C (Continued)
3.5
No Load
All Outputs Static
3.0
Supply Current (mA)
2.5
2.0
1.5
1.0
0.5
0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
Supply Voltage (V)
Figure 7. Supply Current vs Supply Voltage
FN4876 Rev.11.00
May.29.19
Page 11 of 27
ICL3224, ICL3226, ICL3238
4.
4. Application Information
Application Information
ICL3224, ICL3226, and ICL3238 (ISL32xx) devices operate from a single +3V to +5.5V supply, ensure a 250kbps
minimum data rate, require only four small external 0.1µF capacitors, feature low power consumption, and meet
all ElA RS-232C and V.28 specifications.
4.1
Charge-Pump
The ICL32xx devices use regulated on-chip dual charge pumps as voltage doublers, and voltage inverters to
generate ±5.5V transmitter supplies from a VCC supply as low as 3.0V, which allows them to maintain RS-232
compliant output levels over the ±10% tolerance range of 3.3V powered systems. The efficient on-chip power
supplies require only four small, external 0.1µF capacitors for the voltage doubler and inverter functions at
VCC = 3.3V. See the Capacitor Selection section, and Table 6 on page 19 for capacitor recommendations for other
operating conditions. The charge pumps operate discontinuously (turning off when the V+ and V- supplies are
pumped up to the nominal values), resulting in significant power savings.
4.1.1 Charge Pump Absolute Maximum Ratings
These 3V to 5V RS-232 transceivers have been fully characterized for 3.0V to 3.6V operation, and at critical
points for 4.5V to 5.5V operation. Furthermore, load conditions were favorable using static logic states only.
The specified maximum values for V+ and V- are +7V and -7V, respectively. These limits apply for VCC values set
to 3.0V and 3.6V (see Table 2). For VCC values set to 4.5V and 5.5V, the maximum values for V+ and V- can
approach +9V and -7V respectively (see Table 3). The breakdown characteristics for V+ and V- were measured
with ±13V.
Table 2.
V+ and V- Values for VCC = 3.0V to 3.6V
V+ (V)
V- (V)
C1 (μF)
C2, C3, C4 (μF)
Load
T1IN
(Logic State)
0.1
0.1
Open
H
5.8
6.56
-5.6
-5.88
L
5.8
6.56
-5.6
-5.88
2.4kbps
5.8
6.56
-5.6
-5.88
H
5.88
6.6
-5.56
-5.92
L
5.76
6.36
-5.56
-5.76
2.4kbps
6
6.64
-5.64
-5.96
H
5.68
6
-5.6
-5.6
L
5.68
6
-5.6
-5.6
2.4kbps
5.68
6
-5.6
-5.6
H
5.76
6.08
-5.64
-5.64
L
5.68
6.04
-5.6
-5.6
2.4kbps
5.84
6.16
-5.64
-5.72
H
5.88
6.24
-5.6
-5.6
L
5.88
6.28
-5.6
-5.64
2.4kbps
5.8
6.2
-5.6
-5.6
H
5.88
6.44
-5.64
-5.72
L
5.88
6.04
-5.64
-5.64
2.4kbps
5.92
6.4
-5.64
-5.64
3kΩ // 1000pF
0.047
0.33
Open
3kΩ // 1000pF
1
1
Open
3kΩ // 1000pF
FN4876 Rev.11.00
May.29.19
VCC = 3.0V
VCC = 3.6V
VCC = 3.0V
VCC = 3.6V
Page 12 of 27
ICL3224, ICL3226, ICL3238
Table 3.
4. Application Information
V+ and V- Values for VCC = 4.5V to 5.5V
V+ (V)
V- (V)
C1 (μF)
C2, C3, C4 (μF)
Load
T1IN (Logic
State)
0.1
0.1
Open
H
7.44
8.48
-6.16
-6.4
L
7.44
8.48
-6.16
-6.44
2.4kbps
7.44
8.48
-6.17
-6.44
H
7.76
8.88
-6.36
-6.72
L
7.08
8
-5.76
-5.76
2.4kbps
7.76
8.84
-6.4
-6.64
H
6.44
6.88
-5.8
-5.88
L
6.48
6.88
-5.84
-5.88
2.4kbps
6.44
6.88
-5.8
-5.88
H
6.64
7.28
-5.92
-6.04
L
6.24
6.6
-5.52
-5.52
2.4kbps
6.72
7.16
-5.92
-5.96
H
6.84
7.6
-5.76
-5.76
L
6.88
7.6
-5.76
-5.76
2.4kbps
6.92
7.56
-5.72
-5.76
H
7.28
8.16
-5.8
-5.92
L
6.44
6.84
-5.64
-6.84
2.4kbps
7.08
7.76
-5.8
-5.8
3kΩ // 1000pF
0.047
0.33
Open
3kΩ // 1000pF
1
1
Open
3kΩ // 1000pF
VCC = 4.5V
VCC = 5.5V
VCC = 4.5V
VCC = 5.5V
The resulting new maximum voltages at V+ and V- are listed in Table 4.
Table 4.
4.2
New Measured Withstanding Voltages
V+, V- to Ground
±13V
V+ to V-
20V
Transmitters
The transmitters are proprietary, low dropout, inverting drivers that translate TTL/CMOS inputs to EIA/TIA-232
output levels. The transmitters are coupled with the on-chip ±5.5V supplies to deliver true RS-232 levels over a
wide range of single supply system voltages.
Transmitter outputs disable and assume a high impedance state when the device enters the powerdown mode
(see Table 5 on page 15). The outputs can be driven to ±12V when disabled.
All devices ensure a 250kbps data rate for full load conditions (3kΩ and 1000pF), VCC ≥ 3.0V, with one transmitter
operating at full speed. Under more typical conditions of VCC ≥ 3.3V, RL = 3kΩ, and CL = 250pF, one transmitter
easily operates at 1Mbps.
Transmitter inputs float if left unconnected, and can increase ICC. Connect unused inputs to GND for best
performance.
FN4876 Rev.11.00
May.29.19
Page 13 of 27
ICL3224, ICL3226, ICL3238
4.3
4. Application Information
Receivers
All the ICL32xx devices contain standard inverting receivers, but only the ICL3238 receiver can tri-state, using the
FORCEOFF control line. The ICL3238 includes a noninverting (monitor) receiver (denoted by the ROUTB label)
that is always active, regardless of the state of any control lines. This receiver converts RS-232 signals to CMOS
output levels and accepts inputs up to ±25V while presenting the required 3kΩ to 7kΩ input impedance (see
Figure 8) even if the power is off (VCC = 0V). The receivers’ Schmitt trigger input stage uses hysteresis to
increase noise immunity and decrease errors due to slow input signal transitions.
VCC
RXIN
-25V ≤ VRIN ≤ +25V
RXOUT
5kΩ
GND ≤ VROUT ≤ VCC
GND
Figure 8. Inverting Receiver Connections
The ICL3238 inverting receiver disables during forced (manual) powerdown, but not during automatic powerdown
(see Table 5 on page 15). Conversely, the monitor receiver remains active even during manual powerdown, which
makes it extremely useful for Ring Indicator monitoring. Standard receivers driving powered down peripherals
must be disabled to prevent current flow through the peripheral’s protection diodes (see Figures 9 and 10). When
powered down, they cannot be used for wake up functions, but the corresponding monitor receiver can be
dedicated to this task as shown in Figure 10.
VCC
VCC
VCC
Current
Flow
VCC
VOUT = VCC
Transition
Detector
To
Wake-up
Logic
VCC
Rx
R2OUTB
Powered
Down
UART
RX
Tx
GND
ICL3238
SHDN = GND
Old
RS-232 Chip
Powered
Down
UART
VOUT = HI-Z
R2OUT
TX
R2IN
T1IN
T1OUT
FORCEOFF = GND
Figure 9. Power Drain Through Powered Down Peripheral
FN4876 Rev.11.00
May.29.19
Figure 10. Disabled Receivers Prevent Power Drain
Page 14 of 27
ICL3224, ICL3226, ICL3238
4.4
4. Application Information
Powerdown Functionality
The 3V ICL32xx devices require a nominal supply current of 0.3mA during normal operation (not in powerdown
mode). This current is considerably less than the 5mA to 11mA current required of 5V RS-232 devices. The
already low current requirement drops significantly when the device enters powerdown mode. In powerdown,
supply current drops to 1µA, because the on-chip charge pump turns off (V+ collapses to VCC, V- collapses to
GND), and the transmitter outputs tri-state. Inverting receiver outputs may disable in powerdown; see Table 5 for
details. This micro-power mode makes these devices ideal for battery powered and portable applications.
Table 5.
Powerdown Logic Truth Table
RCVR or
XMTR Edge
Within 30 FORCEOFF FORCEON
Sec?
Input
Input
Transmitter
Outputs
Receiver
Outputs
(Note 8)
ROUTB
Outputs
RS-232
Level
Present at
Receiver
Input?
INVALID
Output
Mode of Operation
ICL3224, ICL3226
No
H
H
Active
Active
N.A.
No
L
No
H
H
Active
Active
N.A.
Yes
H
Yes
H
L
Active
Active
N.A.
No
L
Yes
H
L
Active
Active
N.A.
Yes
H
No
H
L
High-Z
Active
N.A.
No
L
No
H
L
High-Z
Active
N.A.
Yes
H
X
L
X
High-Z
Active
N.A.
No
L
X
L
X
High-Z
Active
N.A.
Yes
H
Normal Operation (Enhanced
Auto Powerdown Disabled)
Normal Operation (Enhanced
Auto Powerdown Enabled)
Powerdown Due to Enhanced
Auto Powerdown Logic
Manual Powerdown
ICL322X - INVALID DRIVING FORCEON AND FORCEOFF (Emulates Automatic Powerdown)
X
Note 9
Note 9
Active
Active
N.A.
Yes
H
Normal Operation
X
Note 9
Note 9
High-Z
Active
N.A.
No
L
Forced Auto Powerdown
No
H
H
Active
Active
Active
No
L
No
H
H
Active
Active
Active
Yes
H
Normal Operation (Enhanced
Auto Powerdown Disabled)
Yes
H
L
Active
Active
Active
No
L
Yes
H
L
Active
Active
Active
Yes
H
No
H
L
High-Z
Active
Active
No
L
No
H
L
High-Z
Active
Active
Yes
H
X
L
X
High-Z
High-Z
Active
No
L
X
L
X
High-Z
High-Z
Active
Yes
H
ICL3238
Normal Operation (Enhanced
Auto Powerdown Enabled)
Powerdown Due to Enhanced
Auto Powerdown Logic
Manual Powerdown
ICL3238 - INVALID DRIVING FORCEON AND FORCEOFF (Emulates Automatic Powerdown)
X
Note 9
Note 9
Active
Active
Active
Yes
H
Normal Operation
X
Note 9
Note 9
High-Z
High-Z
Active
No
L
Forced Auto Powerdown
Notes:
8. Applies only to the ICL3238.
9. Input is connected to INVALID Output.
FN4876 Rev.11.00
May.29.19
Page 15 of 27
ICL3224, ICL3226, ICL3238
4. Application Information
4.4.1 Software Controlled (Manual) Powerdown
The ICL32xx devices allow you to force the IC into the low power, standby state, and use a two pin approach
where the FORCEON and FORCEOFF inputs determine the IC’s mode. For always enabled operation,
FORCEON and FORCEOFF are both strapped high. Under logic or software control, only the FORCEOFF input
needs to be driven to switch between active and powerdown modes. The FORCEON state is not critical because
FORCEOFF overrides FORCEON. However, if strictly manual control over powerdown is needed, you must strap
FORCEON high to disable the automatic powerdown circuitry. The ICL3238’s inverting (standard) receiver
outputs also disables when the device is in powerdown and eliminates the possible current path through a
shutdown peripheral’s input protection diode (see Figures 9 and 10).
Connecting FORCEOFF and FORCEON together disables the enhanced automatic powerdown feature, which
enables them to function as a manual SHUTDOWN input (see Figure 11).
FORCEOFF
Power
Management
Logic
FORCEON
INVALID
ICL32xx
I/O
UART
CPU
Figure 11. Connections for Manual Powerdown When No Valid Receiver Signals are Present
With any of the above control schemes, the time required to exit powerdown, and resume transmission is only
100µs.
When using both manual and enhanced automatic powerdown (FORCEON = 0), the ICL32xx devices do not
power up from manual powerdown until both FORCEOFF and FORCEON are driven high, or until a transition
occurs on a receiver or transmitter input. Figure 12 shows a circuit for ensuring that the ICL32xx powers up as
soon as FORCEOFF switches high. The rising edge of the master powerdown signal forces the device to power
up, and the ICL32xx returns to enhanced automatic powerdown mode an RC time constant after this rising edge.
The time constant is not critical, because the ICL32xx remains powered up for 30s after the FORCEON falling
edge, even if there are no signal transitions. The delay gives slow-to-wake systems (such as a mouse) plenty of
time to start transmitting, and as long as it starts transmitting within 30s, both systems remain enabled.
Master Powerdown Line
0.1µF
FORCEOFF
1MΩ
FORCEON
ICL32xx
Figure 12. Circuit to Ensure Immediate Power Up When Exiting Forced Powerdown
FN4876 Rev.11.00
May.29.19
Page 16 of 27
ICL3224, ICL3226, ICL3238
4. Application Information
4.4.2 INVALID Output
Table 5 on page 15 shows that the INVALID output always indicates whether or not 30µs have elapsed with invalid
RS-232 signals (see Figures 13 and 15) persisting on all of the receiver inputs and provides you a way to
determine when the interface block should power down. Invalid receiver levels occur whenever the driving
peripheral’s outputs are shut off (powered down) or when the RS-232 interface cable is disconnected. If an
interface cable is disconnected and all the receiver inputs are floating (but pulled to GND by the internal receiver
pull down resistors), the INVALID logic detects the invalid levels and drives the output low. The power
management logic then uses this indicator to power down the interface block. Reconnecting the cable restores
valid levels at the receiver inputs, INVALID switches high, and the power management logic wakes up the
interface block. INVALID can also be used to indicate the DTR or Ring Indicator signal, as long as the other
receiver inputs are floating, or driven to GND (as in the case of a powered down driver).
Valid RS-232 Level - INVALID = 1
2.7V
Indeterminate
0.3V
Invalid Level - INVALID = 0
-0.3V
Indeterminate
-2.7V
Valid RS-232 Level - INVALID = 1
Figure 13. Definition of Valid RS-232 Receiver Levels
4.5
Enhanced Automatic Powerdown
Even greater power savings are available by using the ICL32xx’s enhanced automatic powerdown function. When
the enhanced powerdown logic determines that no transitions have occurred on any of the transmitter nor
receiver inputs for 30s, the charge pump and transmitters powerdown, thereby reducing supply current to 1µA.
The ICL32xx devices automatically power back up whenever they detect a transition on one of these inputs. The
automatic powerdown feature provides additional system power savings without changes to the existing operating
system.
Enhanced automatic powerdown operates when the FORCEON input is low, and the FORCEOFF input is high.
Tying FORCEON high disables automatic powerdown, but manual powerdown is always available using the
overriding FORCEOFF input. Table 5 summarizes the enhanced automatic powerdown functionality.
Figure 14 shows the enhanced powerdown control logic. Note: When the ICL32xx enters powerdown (manually
or automatically), the 30-second timer remains timed out (set), keeping the ICL32xx powered down until
FORCEON transitions high, or until a transition occurs on a receiver or transmitter input.
FORCEOFF
T_IN
Edge
Detect
S
30s
Timer
R_IN
AUTOSHDN
R
Edge
Detect
FORCEON
Figure 14. Enhanced Automatic Powerdown Logic
FN4876 Rev.11.00
May.29.19
Page 17 of 27
ICL3224, ICL3226, ICL3238
4. Application Information
The INVALID output signal switches low to indicate that invalid levels have persisted on all of the receiver inputs
for more than 30µs (see Figure 15), but this signal switch has no direct effect on the state of the ICL32xx (see the
next sections for methods of using INVALID to power down the device). INVALID switches high 1µs after detecting
a valid RS-232 level on a receiver input. INVALID operates in all modes (forced or automatic powerdown, or
forced on), so it is also useful for systems employing manual powerdown circuitry.
Receiver
Inputs
Invalid
} Region
Transmitter
Inputs
Transmitter
Outputs
tINVH
INVALID
Output
tINVL
tAUTOPWDN
tWU
tAUTOPWDN
tWU
READY
Output
V+
VCC
0
V-
Figure 15. Enhanced Automatic Powerdown, INVALID and READY Timing Diagrams
The time to recover from automatic powerdown mode is typically 100µs.
4.5.1 Emulating Standard Automatic Powerdown
FORCEOFF
INVALID
FORCEON
If enhanced automatic powerdown is not desired, you can implement the standard automatic powerdown feature
(mimics the function on the ICL3221/23/43) by connecting the INVALID output to the FORCEON and FORCEOFF
inputs, as shown in Figure 16. After 30µs of invalid receiver levels, INVALID switches low and drives the ICL32xx
into a forced powerdown condition. INVALID switches high as soon as a receiver input senses a valid RS-232
level, forcing the ICL32xx to power on. See the “INVALID Driving FORCEON and FORCEOFF” sections of
Table 5 on page 15 for an operational summary. This operational mode is perfect for hand-held devices that
communicate with another computer using a detachable cable. Detaching the cable allows the internal receiver
pull-down resistors to pull the inputs to GND (an invalid RS-232 level), causing the 30µs timer to time-out and
drive the IC into powerdown. Reconnecting the cable restores valid levels, causing the IC to power back up.
ICL32xx
I/O
UART
CPU
Figure 16. Connections for Automatic Powerdown When No Valid Receiver Signals are Present
FN4876 Rev.11.00
May.29.19
Page 18 of 27
ICL3224, ICL3226, ICL3238
4. Application Information
4.5.2 Hybrid Automatic Powerdown Options
For devices that communicate only through a detachable cable, you can connect INVALID to FORCEOFF (with
FORCEON = 0). While the cable is attached, INVALID and FORCEOFF remain high, so the enhanced automatic
powerdown logic powers down the RS-232 device whenever there is 30s of inactivity on the receiver and
transmitter inputs. Detaching the cable allows the receiver inputs to drop to an invalid level (GND), so INVALID
switches low and forces the RS-232 device to power down. The ICL32xx remains powered down until the cable is
reconnected (INVALID = FORCEOFF = 1), and a transition occurs on a receiver or transmitter input (see
Figure 14 on page 17). For immediate power up when the cable is reattached, connect FORCEON to
FORCEOFF through a network similar to that shown in Figure 12 on page 16.
4.6
READY Output (ICL3224 and ICL3226 only)
The READY output indicates that the ICL322x devices are ready to transmit. READY switches low whenever the
device enters powerdown, and switches back high during power-up when V- reaches -4V or lower.
4.7
Capacitor Selection
The charge pumps require 0.1µF capacitors for 3.3V operation. For other supply voltages see Table 6 for
capacitor values. Do not use values smaller than those listed in Table 6. 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 influences the amount of ripple on V+ and V-.
Table 6.
Required Capacitor Values
VCC (V)
C1 (µF)
C2, C3, C4 (µF)
3.0 to 3.6 (3.3V ±10%)
0.1 (0.22)
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:
10. Parenthesized values apply only to the ICL3238
4.8
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.
FN4876 Rev.11.00
May.29.19
Page 19 of 27
ICL3224, ICL3226, ICL3238
4.9
4. Application Information
Transmitter Outputs when Exiting Powerdown
Figure 17 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 3kΩ in parallel with 2500pF. Note: The transmitters enable only when the
magnitude of the supplies exceed approximately 3V.
5V/Div
FORCEOFF
T1
VCC = +3.3V
C1 - C4 = 0.1µF
2V/Div
T2
5V/Div
READY
TIME (20µs/Div)
Figure 17. Transmitter Outputs When Exiting Powerdown
4.10
Operation Down to 2.7V
The 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.
4.11
High Data Rates
The ICL32xx maintain the RS-232 ±5V minimum transmitter output voltages even at high data rates. Figure 18
shows a transmitter loopback test circuit, and Figure 19 on page 21 shows the loopback test result at 120kbps.
For this test, all transmitters were simultaneously driving RS-232 loads in parallel with 1000pF, at 120kbps.
Figure 20 on page 21 shows the loopback results 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
+
VCC
C1+
V+
C1+
C2
ICL32xx
V-
C2+
C2TIN
ROUT
FORCEON
VCC
+
C3
C4
+
TOUT
RIN
1000pF
5k
FORCEOFF
Figure 18. Transmitter Loopback Test Circuit
FN4876 Rev.11.00
May.29.19
Page 20 of 27
ICL3224, ICL3226, ICL3238
4. Application Information
5V/Div
5V/Div
T1IN
T1IN
T1OUT
T1OUT
R1OUT
R1OUT
VCC = +3.3V
C1 - C4 = 0.1µF
VCC = +3.3V
C1 - C4 = 0.1µF
5µs/Div
2µs/Div
Figure 20. Loopback Test at 250kbps
Figure 19. Loopback Test at 120kbps
4.12
Interconnection with 3V and 5V Logic
The ICL32xx directly interface with 5V CMOS and TTL logic families. The AC, HC, and CD4000 outputs can drive
ICL32xx inputs with the ICL32xx at 3.3V and the logic supply at 5V, but ICL32xx outputs do not reach the
minimum VIH for these logic families. See Table 7 for more information.
Table 7.
Logic Family Compatibility with Various Supply Voltages
System Power Supply Voltage (V)
VCC Supply Voltage (V)
3.3
3.3
5
5
5
3.3
FN4876 Rev.11.00
May.29.19
Compatibility
Compatible with all CMOS families.
Compatible with all TTL and CMOS logic families.
Compatible with ACT and HCT CMOS, and with TTL. ICL32xx outputs
are incompatible with AC, HC, and CD4000 CMOS inputs.
Page 21 of 27
ICL3224, ICL3226, ICL3238
5.
5. Die Characteristics
Die Characteristics
Substrate Potential (Powered Up)
GND
Transistor Count
ICL3224: 937
ICL3226: 825
ICL3238: 1235
Process
Si Gate CMOS
FN4876 Rev.11.00
May.29.19
Page 22 of 27
ICL3224, ICL3226, ICL3238
6.
6. Revision History
Revision History
Rev.
Date
Description
11
May.29.19
Updated to latest formatting.
Updated Related Literature section.
Removed ICL3244 and MAX3244 information from document.
Updated Ordering information table by adding tape and reel information, updated notes, removed retired parts,
and stamped EOL parts.
Added “Charge Pump Absolute Maximum Ratings” on page 12.
Added Revision History
Updated disclaimer.
FN4876 Rev.11.00
May.29.19
Page 23 of 27
ICL3224, ICL3226, ICL3238
7.
7. Package Outline Drawings
Package Outline Drawings
For the most recent package outline drawing, see M16.209.
M16.209 (JEDEC MO-150-AC ISSUE B)
16 Lead Shrink Small Outline Plastic Package (SSOP
N
INCHES
INDEX
AREA
H
0.25(0.010) M
E
GAUGE
PLANE
-B1
2
3
0.25
0.010
SEATING PLANE
-A-
SYMBOL
B M
L
A
D
α
e
B
0.25(0.010) M
A2
A1
C
0.10(0.004)
C A M
B S
MAX
MIN
MAX
NOTES
A
-
0.078
-
2.00
-
A1
0.002
-
0.05
-
-
A2
0.065
0.072
1.65
1.85
-
B
0.009
0.014
0.22
0.38
9
C
0.004
0.009
0.09
0.25
-
D
0.233
0.255
5.90
6.50
3
E
0.197
0.220
5.00
5.60
4
e
-C-
MILLIMETERS
MIN
0.026 BSC
0.65 BSC
-
H
0.292
0.322
7.40
8.20
-
L
0.022
0.037
0.55
0.95
6
8°
0°
N
α
16
0°
16
7
8°
Rev. 3
6/05
Notes:
1. Symbols are defined in the “MO Series Symbol List” in Section 2.2 of
Publication Number 95.
2. Dimensioning and tolerancing per ANSI Y14.5M-1982.
3. Dimension “D” does not include mold flash, protrusions or gate burrs.
Mold flash, protrusion and gate burrs shall not exceed 0.20mm (0.0078
inch) per side.
4. Dimension “E” does not include interlead flash or protrusions. Interlead
flash and protrusions shall not exceed 0.20mm (0.0078 inch) per side.
5. The chamfer on the body is optional. If it is not present, a visual index
feature must be located within the crosshatched area.
6. “L” is the length of terminal for soldering to a substrate.
7. “N” is the number of terminal positions.
8. Terminal numbers are shown for reference only.
9. Dimension “B” does not include dambar protrusion. Allowable dambar
protrusion shall be 0.13mm (0.005 inch) total in excess of “B”
dimension at maximum material condition.
10. Controlling dimension: MILLIMETER. Converted inch dimensions are
not necessarily exact.
FN4876 Rev.11.00
May.29.19
Page 24 of 27
ICL3224, ICL3226, ICL3238
7. Package Outline Drawings
For the most recent package outline drawing, see M20.209.
M20.209 (JEDEC MO-150-AE ISSUE B)
20 Lead Shrink Small Outline Plastic Package (SSOP)
N
INDEX
AREA
H
0.25(0.010) M
E
2
3
0.25
0.010
SEATING PLANE
-A-
INCHES
SYMBOL
GAUGE
PLANE
-B1
B M
L
A
D
-C-
α
e
B
0.25(0.010) M
C
0.10(0.004)
C A M
B S
MILLIMETERS
MIN
MAX
A
0.068
0.078
1.73
1.99
0.002
0.008’
0.05
0.21
A2
0.066
0.070’
1.68
1.78
B
0.010’
0.015
0.25
0.38
NOTES
9
C
0.004
0.008
0.09
0.20’
D
0.278
0.289
7.07
7.33
3
E
0.205
0.212
5.20’
5.38
4
0.026 BSC
0.65 BSC
H
0.301
0.311
7.65
7.90’
L
0.025
0.037
0.63
0.95
8 deg.
0 deg.
N
α
Notes:
1. Symbols are defined in the “MO Series Symbol List” in Section
2.2 of Publication Number 95.
MAX
A1
e
A2
A1
MIN
20
0 deg.
6
20
7
8 deg.
Rev. 3 11/02
2. Dimensioning and tolerancing per ANSI Y14.5M-1982.
3. Dimension “D” does not include mold flash, protrusions or gate
burrs. Mold flash, protrusion and gate burrs shall not exceed
0.20mm (0.0078 inch) per side.
4. Dimension “E” does not include interlead flash or protrusions.
Interlead flash and protrusions shall not exceed 0.20mm (0.0078
inch) per side.
5. The chamfer on the body is optional. If it is not present, a visual
index feature must be located within the crosshatched area.
6. “L” is the length of terminal for soldering to a substrate.
7. “N” is the number of terminal positions.
8. Terminal numbers are shown for reference only.
9. Dimension “B” does not include dambar protrusion. Allowable
dambar protrusion shall be 0.13mm (0.005 inch) total in excess
of “B” dimension at maximum material condition.
10. Controlling dimension: MILLIMETER. Converted inch
dimensions are not necessarily exact.
FN4876 Rev.11.00
May.29.19
Page 25 of 27
ICL3224, ICL3226, ICL3238
7. Package Outline Drawings
For the most recent package outline drawing, see M28.209.
M28.209 (JEDEC MO-150-AH ISSUE B)
28 Lead Shrink Small Outline Plastic Package (SSOP)
N
INDEX
AREA
H
0.25(0.010) M
2
3
0.25
0.010
SEATING PLANE
-A-
INCHES
GAUGE
PLANE
-B1
B M
E
L
A
D
-C-
α
e
B
0.25(0.010) M
C
0.10(0.004)
C A M
SYMBOL
MIN
MAX
MIN
MAX
NOTES
A
-
0.078
-
2.00
-
A1
0.002
-
0.05
-
-
A2
0.065
0.072
1.65
1.85
-
B
0.009
0.014
0.22
0.38
9
C
0.004
0.009
0.09
0.25
-
D
0.390
0.413
9.90
10.50
3
E
0.197
0.220
5.00
5.60
4
e
A2
A1
B S
Notes:
1. Symbols are defined in the “MO Series Symbol List” in Section 2.2
of Publication Number 95.
MILLIMETERS
0.026 BSC
H
0.292
L
0.022
N
α
0.65 BSC
0.322
7.40
0.037
0.55
28
0°
-
0.95
6
28
8°
0°
-
8.20
7
8°
Rev. 2 6/05
2. Dimensioning and tolerancing per ANSI Y14.5M-1982.
3. Dimension “D” does not include mold flash, protrusions or gate
burrs. Mold flash, protrusion and gate burrs shall not exceed
0.20mm (0.0078 inch) per side.
4. Dimension “E” does not include interlead flash or protrusions.
Interlead flash and protrusions shall not exceed 0.20mm (0.0078
inch) per side.
5. The chamfer on the body is optional. If it is not present, a visual
index feature must be located within the crosshatched area.
6. “L” is the length of terminal for soldering to a substrate.
7. “N” is the number of terminal positions.
8. Terminal numbers are shown for reference only.
9. Dimension “B” does not include dambar protrusion. Allowable
dambar protrusion shall be 0.13mm (0.005 inch) total in excess of
“B” dimension at maximum material condition.
10. Controlling dimension: MILLIMETER. Converted inch dimensions
are not necessarily exact.
FN4876 Rev.11.00
May.29.19
Page 26 of 27
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