Datasheet
ICL3238E
±15kV ESD Protected, +3V to +5.5V, 10nA, 250kbps, RS-232 Transceiver with
Enhanced Automatic Powerdown
The ICL3238E contains 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. It
provides ±15kV ESD protection (IEC61000-4-2 Air
Gap and Human Body Model) on transmitter outputs
and receiver inputs (RS-232 pins). Targeted
applications are cell phones, Palmtops, and data
cables in which the low operational power
consumption 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 10nA 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
and provide compatibility with popular PC
communication software.
The ICL3238E is a five driver, three receiver device
optimized for DCE applications with full hardware
handshaking. It includes a noninverting, always-active
receiver for RING INDICATOR monitoring.
The ICL3238E features an enhanced automatic
powerdown function that powers down the on-chip
power-supply and driver circuits. Automatic
powerdown occurs when all receiver and transmitter
inputs detect no signal transitions for a period of 30s.
The ICL3238E automatically powers back up
whenever it senses a transition on any transmitter or
receiver input.
The transmitter and logic inputs include active
feedback resistors that retain the input state when
driven to a valid logic level.
Features
• Pb-free (RoHS compliant)
• ESD protection for RS-232 I/O pins to ±15kV
(IEC61000)
• Active feedback resistors on TX and logic inputs
• Manual and enhanced automatic powerdown
features
• Pin compatible replacement for MAX3238E,
MAX3238, and SP3238E
• Meets EIA/TIA-232 and V.28/V.24 specifications
at 3V
• RS-232 compatible outputs at 2.7V supply
• Flow through pinout
• Latch-up free
• On-chip voltage converters require only four
external capacitors
• Receiver and transmitter 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: 10nA
Applications
• Any system requiring RS-232 communication ports
○ Battery powered, hand-held, and portable
equipment
Table 1 summarizes the features of the ICL3238E.
Application Note AN9863 summarizes the features of
each device in the ICL32xxE 3V RS-232 family.
○ Data cradles
○ Modems, printers, and other peripherals
○ Cellular/mobile phones and data cables
Related Literature
For a full list of related documents, visit our website:
• ICL3238E device page
Table 1.
Summary of Features
Part Number
No. of
Tx.
No. of
Rx.
No. of Monitor
Rx. (ROUTB)
Data Rate
(kbps)
Rx. Enable
Function?
Ready
Output?
Manual
Powerdown?
Enhanced
Automatic
Powerdown
Function?
ICL3238E
5
3
1
250
No
No
Yes
Yes
FN6012 Rev.4.00
Apr.26.19
Page 1 of 24
ICL3238E
Contents
1.
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1
1.2
1.3
1.4
2.
Typical Operating Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Ordering Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Pin Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Pin Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3
3
4
4
Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.1
2.2
2.3
2.4
Absolute Maximum Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Thermal Information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Recommended Operating Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Electrical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6
6
6
7
3.
Typical Performance Curves. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
4.
Application Information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
4.1
4.1.1
4.2
4.3
4.4
4.5
4.5.1
4.5.2
4.5.3
4.5.4
4.5.5
4.6
4.7
4.8
4.9
4.10
5.
Charge Pump. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Charge Pump Abs Max Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Transmitters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Receivers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operation Down to 2.7V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Powerdown Functionality . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Software Controlled (Manual) Powerdown . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
INVALID Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Enhanced Automatic Powerdown . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Emulating Standard Automatic Powerdown. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Hybrid Automatic Powerdown Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Capacitor Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power Supply Decoupling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Transmitter Outputs when Exiting Powerdown . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
High Data Rates . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Interconnection with 3V and 5V Logic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
10
10
11
11
13
13
13
13
15
16
16
16
17
17
18
18
±15kV ESD Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
5.1
5.2
5.3
5.4
Human Body Model (HBM) Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
IEC61000-4-2 Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Air-Gap Discharge Test Method. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Contact Discharge Test Method. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
19
19
19
19
6.
Die Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
7.
Revision History. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
8.
Package Outline Drawings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
FN6012 Rev.4.00
Apr.26.19
Page 2 of 24
ICL3238E
1.
1.1
1. Overview
Overview
Typical Operating Circuit
ICL3238E
+
0.1µF
Note 2
C1
0.1µF
C2
0.1µF
T1IN
T2IN
28
+
C3 (Optional Connection, Note 1
26
C1+
+
+3.3V
27
VCC
25
V+
C11
C2+
+
3
C2-
VT1
24
5
T2
23
6
T3
22
4
C3
0.1µF
Note 2
C4
0.1µF
+
T1OUT
T2OUT
7
T3IN
T3OUT
T4
19
RS-232
Levels
10
T4IN
T4OUT
T5
17
12
T5IN
TTL/CMOS
Logic Levels
+
T5OUT
16
R1OUTB
21
8
R1OUT
R1IN
R1
R2OUT
5kΩ
20
9
R2
R3OUT
18
13
VCC
14
15
To Power
Control Logic
R2IN
5kΩ
11
R3
RS-232
Levels
R3IN
5kΩ
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) (Note 3)
Package (RoHS
Compliant)
Pkg.
Dwg. #
ICL3238ECAZ No longer
available or supported,
recommended replacement:
ICL3238EIAZ
ICL3238 ECAZ
0 to +70
-
28 Ld SSOP
M28.209
ICL3238ECAZ-T No longer
available or supported,
recommended replacement:
ICL3238EIAZ-T
ICL3238 ECAZ
0 to +70
1k
28 Ld SSOP
M28.209
ICL3238EIAZ
ICL32 38EIAZ
-40 to +85
-
28 Ld SSOP
M28.209
ICL3238EIAZ-T
ICL32 38EIAZ
-40 to +85
1k
28 Ld SSOP
M28.209
FN6012 Rev.4.00
Apr.26.19
Page 3 of 24
ICL3238E
1. Overview
Part Number
(Notes 4, 5)
Part Marking
Temp Range (°C)
Tape and Reel
(Units) (Note 3)
Package (RoHS
Compliant)
Pkg.
Dwg. #
ICL3238EIVZ
ICL3238 EIVZ
-40 to +85
-
28 Ld TSSOP
M28.173
ICL3238EIVZ-T
ICL3238 EIVZ
-40 to +85
2.5k
28 Ld TSSOP
M28.173
Notes:
3. See TB347 for details about reel specifications.
4. These Pb-free plastic packaged products employ special Pb-free material sets; molding compounds/die attach materials and NiPdAu-Ag
plate - e4 termination finish, which is 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 ICL3238E device page. For more information about MSL, see TB363.
1.3
Pin Configuration
28 Ld SSOP, 28 Ld TSSOP
Top View
C2+
1
28 C1+
GND
2
27 V+
C2-
3
26 VCC
V-
4
25 C1-
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 (Note 6).
TxOUT
RxIN
15kV ESD protected, RS-232 level (nominally ±5.5V) transmitter outputs.
15kV ESD protected, 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.
FN6012 Rev.4.00
Apr.26.19
Page 4 of 24
ICL3238E
1. Overview
Pin
Function
FORCEOFF
Active low to shut down transmitters and on-chip power supply. This pin overrides any automatic circuitry and FORCEON
(see Table 5, Note 6).
FORCEON
Active high input to override automatic powerdown circuitry, which keeps transmitters active (FORCEOFF must be high,
Note 6).
Note:
6. These input pins incorporate positive feedback resistors. When the input is driven to a valid logic level, the feedback resistor maintains
that logic level until VCC is removed. Unused transmitter inputs can remain unconnected.
FN6012 Rev.4.00
Apr.26.19
Page 5 of 24
ICL3238E
2.
2. Specifications
Specifications
2.1
Absolute Maximum Ratings
Minimum
Maximum
Unit
VCC to GND
Parameter
-0.3
+6
V
V+ to GND
-0.3
+7
V
V- to GND
+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
-0.3
Short-Circuit Duration
Continuous
TOUT
ESD Rating
See ESD Performance
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 7)
θJA (°C/W)
28 Ld TSSOP Package
100
28 Ld SSOP Package
110
Note:
7. θJA is measured with the component mounted on a low-effective thermal conductivity test board in free air. See TB379 for details.
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
ICL3238ECx
0
+70
°C
ICL3238EIx
-40
+85
°C
Temperature Range
FN6012 Rev.4.00
Apr.26.19
Page 6 of 24
ICL3238E
2.4
2. Specifications
Electrical Specifications
Test conditions: VCC = 3.15V to 5.5V, C1 - C4 = 0.1µF; VCC = 3V, C1 - C4 = 0.22µF; unless otherwise specified. Typicals are at TA = 25°C
Parameter
Test Conditions
Temp (°C)
Min
Typ
Max
Unit
Supply Current, Automatic
Powerdown
All RIN Open, FORCEON = GND, FORCEOFF = VCC
25
-
10
300
nA
Supply Current, Powerdown
FORCEOFF = GND
25
-
10
300
nA
Supply Current, Automatic
Powerdown Disabled
All Outputs Unloaded,
FORCEON = FORCEOFF = VCC
25
-
0.3
1.0
mA
Full
-
-
0.8
V
VCC = 3.3V
Full
-
-
0.8
V
VCC = 5.0V
Full
-
-
0.8
V
TIN Active
VCC = 3.6V
Full
2.0
-
-
V
TIN, FORCEON, FORCEOFF
Wake up Threshold
VCC = 3.3V
Full
2.0
-
-
V
VCC = 5.0V
Full
2.4
-
-
V
DC Characteristics
Logic and Transmitter Inputs and Receiver Outputs
Input Logic Threshold Low
TIN Active
TIN, FORCEON, FORCEOFF
Wake up Threshold
Input Logic Threshold High
Input Leakage Current
TIN, FORCEON, FORCEOFF, VIN = 0V or VCC
(Note 8)
Full
-
±0.01
±1.0
µA
Output Leakage Current
FORCEOFF = GND
Full
-
±0.05
±10
µA
Output Voltage Low
IOUT = 1.0mA
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
Full
0.6
1.2
-
V
VCC = 5.0V
Full
0.8
1.5
-
V
VCC = 3.3V
Full
-
1.5
2.4
V
VCC = 5.0V
Full
-
1.8
2.4
V
Input Hysteresis
25
-
0.6
-
V
Input Resistance
25
3
5
7
kΩ
Input Threshold Low
Input Threshold High
Enhanced Automatic Powerdown (FORCEON = GND, FORCEOFF = VCC)
Receiver Input Thresholds to
INVALID High
(Figure 8)
Full
-2.7
-
2.7
V
Receiver Input Thresholds to
INVALID Low
(Figure 8)
Full
-0.3
-
0.3
V
INVALID Output Voltage Low
IOUT = 1.0mA
Full
-
-
0.4
V
INVALID Output Voltage High
IOUT = -1.0mA
Full
VCC - 0.6
-
-
V
Receiver Positive or Negative
Threshold to INVALID High
Delay (tINVH)
25
-
0.3
-
µs
Receiver Positive or Negative
Threshold to INVALID Low
Delay (tINVL)
25
-
60
-
µs
(Note 9)
25
-
25
-
µs
Receiver or Transmitter Edge (Note 9)
to Transmitters Disabled Delay
(tAUTOPWDN)
Full
15
30
60
s
Receiver or Transmitter Edge
to Transmitters Enabled Delay
(tWU)
FN6012 Rev.4.00
Apr.26.19
Page 7 of 24
ICL3238E
2. Specifications
Test conditions: VCC = 3.15V to 5.5V, C1 - C4 = 0.1µF; VCC = 3V, C1 - C4 = 0.22µF; unless otherwise specified. Typicals are at TA = 25°C
Parameter
Test Conditions
Temp (°C)
Min
Typ
Max
Unit
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
-
W
Full
-
±35
±60
mA
VOUT =±12V, VCC = 0V or 3V to 5.5V,
Automatic Powerdown or FORCEOFF = GND
Full
-
-
±25
µA
Maximum Data Rate
RL = 3kΩCL = 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
Output Short-Circuit Current
Output Leakage Current
Timing Characteristics
Receiver Output Enable Time
Normal Operation
25
-
150
-
ns
Receiver Output Disable Time
Normal Operation
25
-
300
-
ns
Transmitter Skew
tPHL - tPLH
25
-
50
-
ns
Receiver Skew
tPHL - tPLH
25
-
50
-
ns
Transition Region Slew Rate
VCC = 3.3V,
RL = 3kΩto 7kΩ
Measured From 3V to -3V
or -3V to 3V
CL = 150pF to 1000pF
25
6
15
30
V/µs
CL = 150pF to 2500pF
25
4
12
30
V/µs
IEC61000-4-2 Air Gap Discharge
25
-
15
-
kV
IEC61000-4-2 Contact Discharge
25
-
8
-
kV
Human Body Model
25
-
15
-
kV
Human Body Model
25
-
2.5
-
kV
ESD Performance
RS-232 Pins (TOUT, RIN)
All Other Pins
Notes:
8. These inputs use a positive feedback resistor. The input current is negligible when the input is at either supply rail.
9. An “edge” is defined as a transition through the transmitter or receiver input thresholds.
FN6012 Rev.4.00
Apr.26.19
Page 8 of 24
ICL3238E
3.
3. Typical Performance Curves
Typical Performance Curves
VCC = 3.3V, TA = 25°C
25
6
-Slew
20
2
Slew Rate (V/µs)
Transmitter Output Voltage (V)
VOUT+
4
1 Transmitter at 250kbps
Other Transmitters at 30kbps
0
-2
15
+Slew
10
VOUT -
-4
-Slew
-6
0
1000
2000
3000
4000
5
5000
0
1000
3.5
50
3.0
Supply Current (mA)
Supply Current (mA)
55
250kbps
40
120kbps
35
30
25
20kbps
20
0
1000
2000
3000
4000
5000
4000
No Load
All Outputs Static
2.5
2.0
1.5
1.0
0.5
5000
Load Capacitance (pF)
Figure 3. Supply Current vs Load Capacitance When
Transmitting Data
FN6012 Rev.4.00
Apr.26.19
3000
Figure 2. Slew Rate vs Load Capacitance
Figure 1. Transmitter Output Voltage vs Load
Capacitance
45
2000
Load Capacitance (pF)
Load Capacitance (pF)
0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
Supply Voltage (V)
Figure 4. Supply Current vs Supply Voltage
Page 9 of 24
ICL3238E
4.
4. Application Information
Application Information
The ICL3238E operates from a single +3V to +5.5V supply, ensures a 250kbps minimum data rate, requires only
four small external 0.1µF (0.22µF for VCC = 3.0V) capacitors, features low power consumption, and meets all
EIA/TIA-232 and V.28 specifications.
4.1
Charge Pump
The ICL32xxE family uses 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. The charge pumps allow these devices 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 “Enhanced Automatic Powerdown” on page 15 and Table 6 for capacitor
recommendations for other operating conditions. The charge pumps operate discontinuously (turning off as soon
as the V+ and V- supplies are pumped up to the nominal values) and provide significant power savings.
4.1.1 Charge Pump Abs Max Ratings
The ICL3238E is 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 (Table 3 on page 11). The breakdown characteristics for V+ and V- were
measured with ±13V.
Table 2.
V+ and V- Values for VCC = 3.0V to 3.6V
C1 (μF)
C2, C3, C4 (μF)
Load
T1IN
(Logic State)
0.1
0.1
Open
H
3kΩ // 1000pF
0.047
0.33
Open
3kΩ // 1000pF
1
1
Open
3kΩ // 1000pF
FN6012 Rev.4.00
Apr.26.19
V+ (V)
V- (V)
VCC = 3.0V
VCC = 3.6V
VCC = 3.0V
VCC = 3.6V
5.80
6.56
-5.60
-5.88
L
5.80
6.56
-5.60
-5.88
2.4kbps
5.80
6.56
-5.60
-5.88
H
5.88
6.60
-5.56
-5.92
L
5.76
6.36
-5.56
-5.76
2.4kbps
6.00
6.64
-5.64
-5.96
H
5.68
6.00
-5.60
-5.60
L
5.68
6.00
-5.60
-5.60
2.4kbps
5.68
6.00
-5.60
-5.60
H
5.76
6.08
-5.64
-5.64
L
5.68
6.04
-5.60
-5.60
2.4kbps
5.84
6.16
-5.64
-5.72
H
5.88
6.24
-5.60
-5.60
L
5.88
6.28
-5.60
-5.64
2.4kbps
5.80
6.20
-5.60
-5.60
H
5.88
6.44
-5.64
-5.72
L
5.88
6.04
-5.64
-5.64
2.4kbps
5.92
6.40
-5.64
-5.64
Page 10 of 24
ICL3238E
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
-6.40
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
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
L
7.08
8.00
-5.76
-5.76
2.4kbps
7.76
8.84
-6.40
-6.64
H
6.44
6.88
-5.80
-5.88
L
6.48
6.88
-5.84
-5.88
2.4kbps
6.44
6.88
-5.80
-5.88
H
6.64
7.28
-5.92
-6.04
L
6.24
6.60
-5.52
-5.52
2.4kbps
6.72
7.16
-5.92
-5.96
H
6.84
7.60
-5.76
-5.76
L
6.88
7.60
-5.76
-5.76
2.4kbps
6.92
7.56
-5.72
-5.76
H
7.28
8.16
-5.80
-5.92
L
6.44
6.84
-5.64
-6.84
2.4kbps
7.08
7.76
-5.80
-5.80
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 across a
wide range of single supply system voltages.
The transmitter outputs disable and assume a high impedance state when the device enters the powerdown
mode (see Table 5 on page 12). 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.
The transmitter inputs incorporate an active positive feedback resistor that maintains the last driven input state in
the absence of a forcing signal. Unused transmitter inputs can remain unconnected.
4.3
Receivers
The ICL3238E contains both standard inverting, three-state receivers and a single noninverting (monitor) receiver
(denoted by the ROUTB label) that is always active, regardless of the state of any control lines. Both receiver types
convert RS-232 signals to CMOS output levels and accept inputs up to ±25V while presenting the required 3kΩ to
7kΩ input impedance (see Figure 5 on page 12) 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.
The inverting receivers disable during forced (manual) powerdown, but not during automatic powerdown (see
Table 5).
FN6012 Rev.4.00
Apr.26.19
Page 11 of 24
ICL3238E
Table 5.
Rcvr Or
Xmtr Edge
Within 30
Sec?
4. Application Information
Powerdown Logic Truth Table
FORCEOFF FORCEON
Input
Input
Transmitter
Outputs
Receiver
Outputs
ROUTB
Output
RS-232
Level
Present at
Receiver
Input?
INVALID
Output
Mode of Operation
No
H
H
Active
Active
Active
No
L
Normal Operation
(Enhanced Auto Powerdown
Disabled)
No
H
H
Active
Active
Active
Yes
H
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
Powerdown Due to
Enhanced Auto Powerdown
Logic
X
L
X
High-Z
High-Z
Active
No
L
Manual Powerdown
X
L
X
High-Z
High-Z
Active
Yes
H
Normal Operation
(Enhanced Auto Powerdown
Enabled)
INVALID Driving FORCEON and FORCEOFF (Emulates Automatic Powerdown)
X
Note 10
Note 10
Active
Active
Active
Yes
H
Normal Operation
X
Note 10
Note 10
High-Z
High-Z
Active
No
L
Forced Auto Powerdown
Note:
10. Input is connected to INVALID Output.
Conversely, the monitor receiver remains active even during manual powerdown, so it is 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 6 and 7). Disabling the receivers prevents
them from being used for wake up functions, but the corresponding monitor receiver can be dedicated to this task
as shown in Figure 7.
VCC
RXOUT
RXIN
-25V VRIN +25V
5kΩ
GND VROUT VCC
GND
Figure 5. Inverting Receiver Connections
777
VCC
VCC
Current
Flow
VCC
VOUT = VCC
Rx
Powered
Down
UART
Tx
GND
SHDN = GND
Old
RS-232 Chip
Figure 6. Power Drain Through Powered Down
Peripheral
FN6012 Rev.4.00
Apr.26.19
Page 12 of 24
ICL3238E
4. Application Information
VCC
Transition
Detector
To
Wake-Up
Logic
ICL3238E
VCC
R1OUTB
RX
Powered
Down
UART
VOUT = HI-Z
R1OUT
TX
R1IN
T1IN
T1OUT
FORCEOFF = GND
Figure 7. Disabled Receivers Prevent Power Drain
4.4
Operation Down to 2.7V
The ICL3238E transmitter outputs meet RS-562 levels (±3.7V), at full data rate with VCC as low as 2.7V. RS-562
levels typically ensure interoperability with RS-232 devices.
4.5
Powerdown Functionality
The ICL3238E requires a nominal supply current of 0.3mA during normal operation (not in powerdown mode).
This supply current is considerably less than the 5mA to 11mA current required by 5V RS-232 devices. The
already low current requirement drops significantly when the device enters powerdown mode. In powerdown,
supply current drops to 10nA because the on-chip charge pump turns off (V+ collapses to VCC, V- collapses to
GND), and the transmitter outputs tri-state. This micro-power mode makes the ICL3238E ideal for battery
powered and portable applications.
4.5.1 Software Controlled (Manual) Powerdown
The ICL3238E allows you to force the IC into the low power standby state, and uses 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 enhanced automatic powerdown circuitry. The ICL3238E inverting (standard) receiver outputs
also disable when the ICL3238E is in manual powerdown. The disabled receiver outputs eliminate the possible
current path through a shutdown peripheral’s input protection diode (see Figures 6 and 7).
Connecting FORCEOFF and FORCEON together disables the enhanced automatic powerdown feature and
enables them to function as a manual SHUTDOWN input (see Figure 9 on page 14).
4.5.2 INVALID Output
Table 5 shows that the INVALID output always indicates whether 30µs have elapsed with invalid RS-232 signals
persisting on all of the receiver inputs (see Figures 8 and 12). The indicator provides an easy 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).
FN6012 Rev.4.00
Apr.26.19
Page 13 of 24
ICL3238E
4. Application Information
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 8. Definition of Valid RS-232 Receiver Levels
FORCEOFF
Power
Management
Logic
FORCEON
INVALID
ICL3238E
I/O
UART
CPU
Figure 9. 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
25µs.
When using both manual and enhanced automatic powerdown (FORCEON = 0), the ICL3238E does 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 10 shows a circuit for ensuring that the ICL3238E powers up as soon as
FORCEOFF switches high. The rising edge of the Master Powerdown signal forces the device to power up and
the ICL3238E returns to enhanced automatic powerdown mode an RC time constant after this rising edge. The
time constant is not critical because the ICL3238E remains powered up for 30 seconds after the FORCEON
falling edge, even if there are no signal transitions. This gives slow-to-wake systems (for example, a mouse)
plenty of time to start transmitting, and as long as it starts transmitting within 30 seconds both systems remain
enabled.
Power
Management
Unit
Master Powerdown Line
0.1µF
FORCEOFF
1MΩ
FORCEON
ICL3238E
Figure 10. Circuit to Ensure Immediate Power Up When
Exiting Forced Powerdown
FN6012 Rev.4.00
Apr.26.19
Page 14 of 24
ICL3238E
4. Application Information
4.5.3 Enhanced Automatic Powerdown
Even greater power savings are available by using the enhanced automatic powerdown function. When the
enhanced powerdown logic determines that no transitions have occurred on any of the transmitter or receiver
inputs for 30 seconds, the charge pump and transmitters power down and reduce the supply current to 10nA. The
ICL3238E automatically powers back up whenever it detects 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 from the
overriding FORCEOFF input. Table 5 on page 12 summarizes the enhanced automatic powerdown functionality.
Figure 11 shows the enhanced powerdown control logic.
FORCEOFF
T_IN
Edge
Detect
S
30s
Timer
R_IN
AUTOSHDN
R
Edge
Detect
FORCEON
Figure 11. Enhanced Automatic Powerdown Logic
Note: When the ICL3238E enters powerdown (manually or automatically), the 30 second timer remains timed out
(set) and keeps the ICL3238E powered down until FORCEON transitions high, or until a transition occurs on a
receiver or transmitter input.
The INVALID output signal switches low to indicate that invalid levels have persisted on all of the receiver inputs
for more than 60µs (see Figure 12), but this has no direct effect on the state of the ICL3238E (see “Emulating
Standard Automatic Powerdown” on page 16 and “Enhanced Automatic Powerdown” on page 15 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. The time to recover from automatic powerdown mode is
typically 25µs.
} Invalid
Region
Receiver
Inputs
Transmitter
Inputs
Transmitter
Outputs
tINVH
INVALID
Output
tINVL
tAUTOPWDN
tAUTOPWDN
tWU
tWU
V+
VCC
0
V-
Figure 12. Enhanced Automatic Powerdown and INVALID Timing Diagrams
FN6012 Rev.4.00
Apr.26.19
Page 15 of 24
ICL3238E
4. Application Information
4.5.4 Emulating Standard Automatic Powerdown
FORCEOFF
FORCEON
INVALID
If enhanced automatic powerdown is not required, you can implement the standard automatic powerdown feature
(mimics the function on the ICL3221, ICL3223, and ICL3243E) by connecting the INVALID output to the
FORCEON and FORCEOFF inputs, as shown in Figure 13. After 60µs of invalid receiver levels, INVALID
switches low and drives the ICL3238E into a forced powerdown condition. INVALID switches high as soon as a
receiver input senses a valid RS-232 level and forces the ICL3238E to power on. See the “INVALID DRIVING
FORCEON AND FORCEOFF” section of Table 5 for an operational summary. This operational mode is perfect for
handheld devices that communicate with another computer through a detachable cable. Detaching the cable
allows the internal receiver pull-down resistors to pull the inputs to GND (an invalid RS-232 level) and causes the
60µs timer to time out and drive the IC into powerdown. Reconnecting the cable restores valid levels and causes
the IC to power back up.
ICL3238E
I/O
UART
CPU
Figure 13. Connections for Automatic Powerdown When
No Valid Receiver Signals are Present
4.5.5 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 30 seconds 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 ICL3238E remains powered down until the cable
is reconnected (INVALID = FORCEOFF = 1) and a transition occurs on a receiver or transmitter input
(see Figure 11). For immediate power up when the cable is reattached, connect FORCEON to FORCEOFF
through a network similar to that shown in Figure 10.
4.6
Capacitor Selection
The charge pumps require 0.1µF or greater capacitors for 3.3V (5% tolerance) 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).
Table 6.
Required Capacitor Values
VCC (V)
C1 (µF)
C2, C3, C4 (µF)
3.0 to 3.6 (3.3V 10%)
0.22
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
0.22
1
FN6012 Rev.4.00
Apr.26.19
Page 16 of 24
ICL3238E
4. Application Information
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-.
4.7
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.
4.8
Transmitter Outputs when Exiting Powerdown
Figure 14 shows the response of two transmitter outputs when exiting powerdown mode. As the two transmitter
outputs activate, they properly go to opposite RS-232 levels with no glitching, ringing, or undesirable transients.
Each transmitter is loaded with 3kΩin parallel with 2500pF. Note: The transmitters enable only when the
magnitude of the supplies exceeds approximately 3V.
5V/Div
FORCEOFF
T1
2V/Div
T2
VCC = +3.3V
C1 - C4 = 0.1µF
Time (20µs/Div)
Figure 14. Transmitter Outputs When Exiting
Powerdown
FN6012 Rev.4.00
Apr.26.19
Page 17 of 24
ICL3238E
4.9
4. Application Information
High Data Rates
The ICL3238E maintains the RS-232 ±5V minimum transmitter output voltages even at high data rates. Figure 15
shows a transmitter loopback test circuit and Figure 16 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 17 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
+
VCC
C1+
C1
V+
+
C3
C1ICL3238E
+
V-
C2+
C2
C4
+
C2TIN
TOUT
FORCEON
VCC
1000pF
RIN
ROUT
5k
FORCEOFF
Figure 15. Transmitter Loopback Test Circuit
5V/Div
5V/Div
T1IN
T1IN
T1OUT
T1OUT
R1OUT
R1OUT
VCC = +3.3V
C1 - C4 = 0.1µF
VCC = +3.3V
C1 - C4 = 0.1µF
2µs/Div
5µs/Div
Figure 17. Loopback Test at 250kbps
Figure 16. Loopback Test at 120kbps
4.10
Interconnection with 3V and 5V Logic
The ICL3238E directly interfaces with 5V CMOS and TTL logic families. AC, HC, and CD4000 outputs can drive
the ICL32xx inputs with the ICL32xx at 3.3V and the logic supply at 5V, but the 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
FN6012 Rev.4.00
Apr.26.19
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 18 of 24
ICL3238E
5.
5. ±15kV ESD Protection
±15kV ESD Protection
All pins on the ICL32xx devices include ESD protection structures, but the ICL32xxE family incorporates
advanced structures that allow the RS-232 pins (transmitter outputs and receiver inputs) to survive ESD events
up to ±15kV. The RS-232 pins are particularly vulnerable to ESD damage because they typically connect to an
exposed port on the exterior of the finished product. Touching the port pins or connecting a cable can cause an
ESD event that might destroy unprotected ICs. The ESD structures protect the device whether or not it is powered
up, protect without allowing any latchup mechanism to activate, and do not interfere with RS-232 signals as large
as ±25V.
5.1
Human Body Model (HBM) Testing
The Human Body Model (HBM) test method emulates the ESD event delivered to an IC during human handling.
The tester delivers the charge through a 1.5kΩ current limiting resistor, so the test is less severe than the
IEC61000 test, which uses a 330Ω limiting resistor. The HBM method determines an IC’s ability to withstand the
ESD transients typically present during handling and manufacturing. Due to the random nature of these events,
each pin is tested with respect to all other pins. The RS-232 pins on “E” family devices can withstand HBM ESD
events to ±15kV.
5.2
IEC61000-4-2 Testing
The IEC61000 test method applies to finished equipment, rather than to an individual IC. Therefore, the pins most
likely to suffer an ESD event are those that are exposed to the outside world (the RS-232 pins in this case), and
the IC is tested in its typical application configuration (power applied) rather than testing each pin-to-pin
combination. The lower current limiting resistor coupled with the larger charge storage capacitor yields a test that
is much more severe than the HBM test. The extra ESD protection built into this device’s RS-232 pins allows the
design of equipment meeting level 4 criteria without the need for additional board level protection on the RS-232
port.
5.3
Air-Gap Discharge Test Method
For the air-gap discharge test method, a charged probe tip moves toward the IC pin until the voltage arcs to it.
The current waveform delivered to the IC pin depends on factors such as approach speed, humidity, and
temperature, so it is difficult to obtain repeatable results. The “E” device RS-232 pins withstand ±15kV air-gap
discharges.
5.4
Contact Discharge Test Method
During the contact discharge test, the probe contacts the tested pin before the probe tip is energized and
eliminates the variables associated with the air-gap discharge. The result is a more repeatable and predictable
test, but equipment limits prevent testing devices at voltages higher than ±8kV. All “E” family devices survive ±8kV
contact discharges on the RS-232 pins.
FN6012 Rev.4.00
Apr.26.19
Page 19 of 24
ICL3238E
6.
6. Die Characteristics
Die Characteristics
Substrate Potential (Powered Up)
GND
Transistor Count
1235
Process
Si Gate CMOS
FN6012 Rev.4.00
Apr.26.19
Page 20 of 24
ICL3238E
7.
7. Revision History
Revision History
Rev.
Date
6.00
Apr.26.19
FN6012 Rev.4.00
Apr.26.19
Description
Added Related Literature section on page 1.
Updated ordering information table:
-Removed ICL3238ECA, ICL3238ECA-T ICL3238EIA, ICL3238EIA-T, and ICL3238EIV-T
-Added ICL3238EIVZ
-Added information about replacement parts for the end of life ICL3238ECAZ and ICL3238ECAZ-T
-Added tape and reel column and Notes 1, 2, and 3
Added Charge Pump Abs Max Ratings section starting on page 10.
Updated package outline drawing M28.209 from revision 1 to revision 2.
Remove "u" symbol from drawing (overlaps the "a" on Side View).
Updated package outline drawing M28.173 from revision 0 to revision 1.
Convert to new POD format by moving dimensions from table onto drawing and adding land pattern. No
dimension changes.
Applied new template.
Updated disclaimer.
Page 21 of 24
ICL3238E
8.
8. Package Outline Drawings
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
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
A
D
e
A2
A1
B
C
0.10(0.004)
C A M
B S
Notes:
1. Symbols are defined in the “MO Series Symbol List” in Section 2.2
of Publication Number 95.
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
-C-
0.25(0.010) M
L
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
28
0°
28
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.
FN6012 Rev.4.00
Apr.26.19
Page 22 of 24
ICL3238E
8. Package Outline Drawings
M28.173
28 Lead Thin Shrink Small Outline Package (TSSOP)
Rev 1, 5/10
For the most recent package outline drawing, see M28.173.
A
9.70± 0.10
1
3
SEE DETAIL "X"
15
28
6.40
PIN #1
I.D. MARK
4.40 ± 0.10
2
3
0.20 C B A
1
14
0.15 +0.05
-0.06
B
0.65
TOP VIEW
END VIEW
1.00 REF
H
- 0.05
0.90 +0.15
-0.10
C
GAUGE
PLANE
1.20 MAX
SEATING PLANE
+0.05
5
-0.06
0.10 M C B A
0.25
0.10 C
0.25
0°-8°
0.05 MIN
0.15 MAX
0.60 ±0.15
SIDE VIEW
DETAIL "X"
(1.45)
NOTES:
1. Dimension does not include mold flash, protrusions or gate burrs.
Mold flash, protrusions or gate burrs shall not exceed 0.15 per side.
(5.65)
2. Dimension does not include interlead flash or protrusion. Interlead
flash or protrusion shall not exceed 0.25 per side.
3. Dimensions are measured at datum plane H.
4. Dimensioning and tolerancing per ASME Y14.5M-1994.
5. Dimension does not include dambar protrusion. Allowable protrusion
shall be 0.08mm total in excess of dimension at maximum material
condition. Minimum space between protrusion and adjacent lead
(0.65 TYP)
TYPICAL RECOMMENDED LAND PATTERN
(0.35 TYP)
is 0.07mm.
6. Dimension in ( ) are for reference only.
7. Conforms to JEDEC MO-153.
FN6012 Rev.4.00
Apr.26.19
Page 23 of 24
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