UM3243
Low Supply Current, 3V to 5.5V, 250kbps, 3-Driver/5-Receiver,
Enhanced ESD Protection Smart RS-232 Transceivers
UM3243EEAS/UM3243EEASR/
UM3243EEUS/UM3243EESS/UM3243EEQA
General Description
The UM3243 series are 3-driver/5-receiver 3V-5.5V powered RS-232 transceivers featuring Auto
Power-Off and low supply current, when no valid RS-232 level signal is sensed on any receiver inputs,
the charge pump circuit and drivers will be powered off. Disconnection of the RS-232 cable or
poweroff of the transmitters of the attaching peripherals will lead to Power-Off mode. When a valid
level is applied to any RS-232 receiver inputs, the chip will turn on again. The Auto Power-Off mode
helps to save power without changing the existing system.
The UM3243 transceivers have a regulated discontinuous mode dual charge pump power supply and
low-dropout transmitters, which combine to deliver true RS-232 performance from a single +3V to
+5.5V supply. Data rate of 250kbps is guaranteed.
The UM3243 needs only four 0.1μF capacitors in 3.3V operation, and can operate from input voltages
ranging from +2.7V to +5.5V. They are ideal for 3.3V-only systems, mixed 3.3V and 5.0V systems,
or 5.0V-only systems that require true RS-232 performance or EIA/TIA-562 levels of ±3.7V with
supply voltages as low as 2.7V.
The UM3243 includes one complementary always-active receiver. This receiver can monitor an
external
device (such as a modem) in Power-Off. The UM3243 also includes an always-active
_________________
INVALID output which indicates valid RS-232 signal levels on any receiver inputs. It is usually used
in UART wakeup. The UM3243 also features enhanced ESD protection with ±15kV for human body
mode and ±8kV for IEC61000-4-2 contact discharge mode.
Applications
z
z
z
z
z
Industrial Controllers and Instruments
Notebooks, Palmtop PCs and Laptops
Networking Routers and Switches
Peripherals
Printers, PDAs and POS
Features
z
z
z
z
z
z
z
z
z
Meets True EIA/TIA-232-F Standards from a +3.0V to +5.5V Power Supply
Meets EIA/TIA-562 Levels of ±3.7V with Supply Voltages as Low as 2.7V
Auto Power-Off Feature to Disable Driver Outputs when No Valid RS-232 Signal is Sensed
250kbps Minimum Transmission Rate
0.1μA (Typ) Low Power-Off Current
Accepts 5V Logic Input with 3.3V Supply
Latch-Up Performance Exceeds 200mA
Enhanced ESD Specifications for RS-232 Pins:
±15kV Human Body Mode
±8kV IEC61000-4-2 Contact Discharge Mode
Available in SSOP28, TSSOP28, SOP28 and QFN32 Packages
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UM3243
Pin Configurations
Top View
XX: Week Code
UM3243EEAS/UM3243EEASR
SSOP28
XX: Week Code
UM3243EEUS
TSSOP28
SSOP28/TSSOP28/SOP28
XX: Week Code
UM3243EESS
SOP28
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VCC
V+
C1+
NC
XX: Week Code
UM3243EEQA
QFN32 5.0×5.0
NC
ROUT3
ROUT4
C2+
TIN1
ROUT5
V-
C2TIN2
NC
TIN3
NC
UM3243
QFN32 5.0×5.0
Pin Description
Pin No.
UM3243EEAS/EEASR/
EEUS/EESS
UM3243EEQA
Pin Name
1
29
C2+
2
30
C2-
3
4-8
9, 10, 11
12, 13, 14
15-19
31
1-5
6, 7, 8
10, 11, 12
13, 14, 15, 17, 18
VRIN_
TOUT_
TIN_
ROUT_
20
19
ROUT2B
21
20
22
21
FORCEOFF
23
22
FORCEON
24
23
C1-
25
26
27
24
26
27
GND
VCC
V+
28
28
C1+
-
9, 16, 25, 32
NC
_______________
INVALID
__________________
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Function
Positive Terminal of Inverting Charge-Pump
Capacitor
Negative Terminal of Inverting Charge-Pump
Capacitor
Negative Voltage Generated by the Charge Pump
RS-232 Receiver Inputs
RS-232 Transmitter Outputs
TTL/CMOS Transmitter Inputs
TTL/CMOS Receiver Outputs
Non-Inverting
Receiver
Output—active
in
Power-Off
_______________
Output of the Valid Signal Detector. INVALID is
enabled high if a valid RS-232 level is present on
any receiver inputs.
Drive low to shut down transmitters and on-board
power supply. This overrides all Automatic
circuitry and FORCEON (See Function Tables).
Drive high to override
automatic circuitry keeping
__________________
transmitters on (FORCEOFF must be high) (See
Function Tables).
Negative Terminal of the Voltage Doubler
Charge-Pump Capacitor
Ground
+3.0V to +5.5V Supply Voltage
Positive Voltage Generated by the Charge Pump
Positive Terminal of the Voltage Doubler
Charge-Pump Capacitor
Not connected.
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UM3243
Ordering Information
Part Number
Temp. Range
Package Type
Shipping Qty
UM3243EEAS
-40°C to +85°C
SSOP28
UM3243EEASR
-40°C to +85°C
SSOP28
UM3243EEUS
-40°C to +85°C
TSSOP28
48pcs/Tube
2000pcs/13Inch
Tape & Reel
3000pcs/13Inch
Tape & Reel
UM3243EESS
-40°C to +85°C
SOP28
UM3243EEQA
-40°C to +85°C
QFN32 5.0×5.0
25pcs/Tube
3000pcs/13Inch
Tape & Reel
Absolute Maximum Ratings (Note 1)
Symbol
Parameter
Value
Unit
VCC
Supply Voltage on VCC
-0.3 to +6
V
V+
Voltage on V+
(VCC-0.3) to +7.5
V
V-
Voltage on V-
-7.5 to +0.3
V
-0.3 to +6V
V
Voltage on ROUT_, INVALID, ROUT2B
-0.3 to (VCC+0.3)
V
Voltage on RIN_
±30
V
Voltage on TOUT_
(V--0.3) to (V++0.3)
V
Short-Circuit Duration, TOUT_ to GND
Continuous
_____________________
Voltage on TIN_, FORCEOFF, FORCEON
_________________
PD
Continuous Power Dissipation at
TA=70°C
SSOP28
762
TSSOP28
696
SOP28
1000
QFN32
1500
mW
TA
Operating Temperature Range
-40 to +85
°C
TSTG
Storage Temperature Range
Maximum Lead Temperature for Soldering 10
Seconds
-65 to +165
°C
+300
°C
TL
Note 1: Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent
damage to the device. These are stress ratings only, and functional operation of the device at these or
any other conditions beyond those indicated in the operational sections of the specifications is not
implied. Exposure to absolute maximum rating conditions for extended periods may affect device
reliability.
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UM3243
Electrical Characteristics
(VCC=+3.0V to +5.5V, C1- C4=0.1μF, TA=TMIN to TMAX, unless otherwise noted. Typical values are at
TA=25°C)
Parameter
Symbol
Conditions
Min
Typ
Max
Unit
VCC=3.3V
3.0
3.3
3.6
VCC=5.0V
All RIN_ Open,
FORCEON=GND,
_____________________
FORCEOFF=VCC
4.5
5.0
5.5
0.1
10
μA
0.1
10
μA
0.6
1.0
mA
0.8
V
DC CHARACTERISTICS (VCC=+3.3V or +5V, TA=25°C)
Supply Voltage
Supply Current,
Auto Power-Off
Supply Current,
Forced Power-Off
ICC
FORCEOFF=GND
_____________________
FORCEON=FORCEOFF=VCC,
Other Input NC,
All Outputs with No Load
Supply Current,
Normal
LOGIC INPUTS
Input Logic
Threshold Low
_____________________
TIN_, FORCEON, FORCEOFF
TIN_,
FORCEON,
FORCEOFF
Input Logic
Threshold High
Input Hysteresis
_____________________
_____________________
VCC=3.3V
2.0
VCC=5.0V
2.4
Vhys
IIL
V
0.2
_____________________
Input Leakage
Current
V
V
FORCEON, FORCEOFF
±0.01
±1.0
μA
Transmitter
Disabled
±0.01
±1.0
μA
Transmitter
Enabled
±1
±5
μA
0.4
V
TIN_
LOGIC OUTPUTS
Output Voltage
Low
VOL
Output Voltage
High
VOH
Output Leakage
Current
IOL
_________________
INVALID,
ROUT2B,
ROUT_
ROUT_
http://www.union-ic.com Rev.03 Jan.2018
IOL=1.6mA
IOH=-1.0mA
Receivers
Disabled,
Connected to
VCC or GND
VCC-0.6 VCC-0.1
±0.05
V
±10
μA
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UM3243
Electrical Characteristics (Continued)
(VCC=+3.0V to +5.5V, C1- C4=0.1μF, TA=TMIN to TMAX, unless otherwise noted. Typical values are at
TA=25°C)
Parameter
Symbol
Conditions
Min
Typ
Max
Unit
30
V
RECEIVER INPUTS
Input Voltage Range
-30
Input Threshold Low
RIN_
Input Threshold High
Input Hysteresis
Vhys
Input Resistance
Ri
VCC=3.3V
0.8
1.15
VCC=5.0V
0.8
1.55
V
VCC=3.3V
1.35
2
VCC=5.0V
1.75
2
0.2
TA=+25°C
3
5
±5.0
±5.4
V
V
7
kΩ
TRANSMITTER OUTPUTS
Output Voltage Swing
VOUT
Output Short-Circuit
Current
IOS
Output Leakage
Current
IOL
All Transmitter Outputs
Loaded with 3kΩ to Ground
Short to VCC ,
VCC=3.3V
GND or Other
VCC=5.0V
TXD Pin
Transmitter Disabled,
Connected to V+ or V-
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V
±20
±40
mA
±30
±50
mA
±1
±10
μA
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UM3243
Electrical Characteristics (Continued)
(VCC=+3.0V to +5.5V, C1- C4=0.1μF, TA=TMIN to TMAX, unless otherwise noted. Typical values are at
TA=25°C)
Parameter
Symbol
Conditions
Min
Typ
Max
Unit
TIMING CHARACTERISTICS
Maximum Data Rate
Receiver Propagation
Delay
Receiver Skew
Receiver Output
Enable Time
Receiver Output
Disable Time
tPLH, tPHL
RL=3kΩ to 7kΩ,
CL=50pF to 1000pF,
One Transmitter Switching
All Parts,
CL=150pF
Normal
Figure 4
Operation
kbps
0.15
μs
|tPHL-tPLH|
tEN
tDIS
Transmitter
Propagation Delay
tPLH, tPHL
Transmitter Skew
|tPHL-tPLH|
CL=150pF, RL=3kΩ
Figure 5
RL=3kΩ, CL=2500pF,
All Transmitters Loaded
Figure 3
TA=+25°C, VCC=3.3V,
RL=3kΩ to 7kΩ,
Transition-Region
CL=50pF to 1000pF,
SR(tr)
Slew Rate
Measured from -3V to +3V
or +3V to -3V,
Figure 2
ESD AND LATCH UP PERFORMANCE
RIN_, TOUT_
ESD-Protection
Voltage
Other Pins
ESD-Protection
Voltage
Latch Up Performance
250
0.1
μs
0.2
μs
0.2
μs
1.3
5
15
μs
0.25
μs
30
V/μs
Human Body Model
IEC61000-4-2,
Contact Discharge
±15
Human Body Model
±2
kV
JEDEC Standard No.78D
±200
mA
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±8
kV
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UM3243
Auto Power-Off Electrical Characteristics
Over recommended ranges
noted) (Figure 6)
Parameter
Receiver Input_______________
Positive
Threshold to INVALID
Output High
Receiver Input _______________
Negative
Threshold to INVALID
Output High
Receiver
Input Threshold
_________________
to INVALID Output
Low
Receiver Positive or
Negative Threshold to
_________________
INVALID High
Receiver Positive or
Negative Threshold to
_________________
INVALID Low
Receiver Edge to Charge
Pump Setup
of supply voltage and operating free-air temperature (unless otherwise
Symbol
Test Conditions
VIT+(valid)
FORCEON=GND,
___________________
FORCEOFF=VCC
VIT-(valid)
FORCEON=GND,
___________________
FORCEOFF=VCC
-2.7
VT(invalid)
FORCEON=GND,
___________________
FORCEOFF=VCC
-0.3
tvalid
tinvalid
ten
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FORCEON=GND,
___________________
FORCEOFF=VCC,
VCC=5V, Figure 6
FORCEON=GND,
___________________
FORCEOFF=VCC,
VCC=5V, Figure 6
FORCEON=GND,
___________________
FORCEOFF=VCC,
VCC=5V, Figure 6
Min
Typ
Max
Unit
2.7
V
V
0.3
V
1
μs
30
μs
150
μs
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UM3243
Typical Operating Characteristics
(VCC=+3.3V, 0.47μF capacitors, all transmitters loaded with 3kΩ and CL, TA=25°C, unless otherwise
noted.)
V+, V- vs. Supply Voltage
8
6
6
4
4
2
VOUT+
Transmitting at 250kbps
CL=1000pF
0
V+, V- (V)
Transmitter Output Voltage (V)
Transmitter Output Voltage vs. Supply Voltage
8
VOUT-
2
-2
-2
-4
-4
-6
-6
-8
Transmitting at 250kbps
CL=1000pF
0
V+
V-
-8
2.4
2.9
3.4
3.9
Supply Voltage (V)
4.4
4.9
2.4
5.4
2.9
3.4
3.9
4.4
4.9
5.4
Supply Voltage (V)
Supply Current vs. Supply Voltage
Transmitter Output Voltage vs. Load Capacitance
35
8
Transmitter Output Voltage (V)
6
Supply Current (mA)
30
25
Transmitting at 250kbps
CL=1000pF
20
4
2
VOUT+
0
VOUT-
Transmitting at 20kbps
-2
-4
-6
-8
15
2.4
2.9
3.4
3.9
Supply Voltage (V)
4.4
4.9
0
5.4
500
1000
1500
2000
Load Capacitance (pF)
2500
3000
Supply Current vs. Load Capacitance
Slew Rate vs. Load Capacitance
50
26
45
24
22
Transmitting at 20kbps
35
Supply Current (mA)
Slew Rate (V/μs)
40
30
+Slew
25
-Slew
20
15
10
20K
20
120K
18
250K
16
14
12
5
10
0
0
500
1000
1500
2000
Load Capacitance (pF)
2500
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3000
0
500
1000
1500
2000
Load Capacitance (pF)
2500
3000
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UM3243
Typical Operating Characteristics (Continued)
(VCC=+3.3V, 250kbps data rate, 0.47μF capacitors, all transmitters loaded with 5kΩ and CL, TA=25°C,
unless otherwise noted.)
V+, V- vs. Supply Voltage
8
6
6
4
4
2
Transmitting at 250kbps
CL=1000pF
0
V+, V- (V)
Transmitter Output Voltage (V)
Transmitter Output Voltage vs. Supply Voltage
8
VOUT+
VOUT-
2
Transmitting at 250kbps
CL=1000pF
0
-2
-2
-4
-4
-6
-6
V+
V-
-8
-8
2.4
2.9
3.4
3.9
Supply Voltage (V)
4.4
4.9
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5.4
2.4
2.9
3.4
3.9
4.4
Supply Voltage (V)
4.9
5.4
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UM3243
Function Tables
Table 1. Each Transmitter (Note 2)
INPUTS
OUTPUT
VALID RIN
RS-232
TOUT
LEVEL
X
X
L
X
Z
L
H
H
X
H
H
H
H
X
L
L
L
H
Yes
H
H
L
H
Yes
L
X
L
H
No
Z
Note 2: H=high level, L=low level, X=irrelevant, Z=high impedance
_________________________
TIN FORCEON FORCEOFF
TRANSMITTER STATUS
Forced Power-Off
Normal Operation
with Forced Power-On
Normal Operation
with Auto Power-On
Auto Power-Off
Table 2. Each Receiver (Note 3)
RIN
X
L
H
Open
INPUTS
FORCEON
X
X
X
X
_________________________
FORCEOFF
L
H
H
H
OUTPUT
ROUT
Z
H
L
H
RECEIVER STATUS
Forced Power-Off
Normal Operation
________________
Table 3. ROUT2B and Outputs INVALID (Note 3)
INPUTS
OUTPUTS
OUTPUT
VALID RIN
_________________________
___________________
STATUS
RS-232
RIN2 FORCEON FORCEOFF INVALID ROUT2B
LEVEL
Yes
L
X
X
H
L
Yes
H
X
X
H
H
Always Active
Yes
Open
X
X
H
L
No
Open
X
X
L
L
Note 3: H=high level, L=low level, X=irrelevant, Z=high impedance (off), Open=input disconnected
or connected driver off
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UM3243
Logic Diagram
Figure 1
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UM3243
Parameter Measurement Information
SR(tr ) =
6V
tTHL or tTLH
Figure 2. Transmitter Slew Rate
Figure 3. Transmitter Pulse Skew
Figure 4. Receiver Propagation Delay Times
Figure 5. Receiver Enable and Disable Times
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UM3243
__________________
Figure 6. INVALID Propagation Delay Times and Supply Enabling Time
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UM3243
Typical Operating Circuits
Figure 7
Application Information
RS-232 Receivers
The UM3243’s receivers convert RS-232 signals to CMOS-logic output levels. All receivers have
inverting three-state outputs and can be active or inactive.
The UM3243’s receivers are
_____________________
high-impedance when the part is in Forced Power-Off mode (FORCEOFF=low).
The UM3243 features an always-active complementary output (ROUT2B). ROUT2B monitors
receiver activity while the other receivers are high-impedance. This allows Ring Indicator to be
monitored without forward biasing other devices connected to the receiver outputs. This is ideal for
systems where VCC drops to_________________
0 in Power-Off to accommodate peripherals such as UARTs (Figure 8).
The UM3243 features an INVALID output
that is enabled low when no valid RS-232 signal levels
_________________
have been detected on all receiver inputs. INVALID is functional in any mode (Figure 6).
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UM3243
Figure 8. The UM3243 detects RS-232 activity when the UART and interface are powered off.
Auto Power-Off and Wakeup
The UM3243 achieves _____________________
a 0.1μA supply current Auto Power-Off feature, which operates when
FORCEON is low and FORCEOFF is high. When the device senses no valid signal levels on all
receiver inputs for tinvalid time (typically 30μs), the onboard charge pump and drivers are powered off,
reducing supply current to 0.1μA. This occurs if the RS-232 cable is disconnected or the connected
peripheral transmitters are turned off. The device turns on again when a valid level is applied to any
RS-232 receiver input for tvalid time (typically 1μs). The charge pump will set up after ten time
(typically 150μs). As a result, the system saves power without changes to the existing system.
_____________________
Table 3 and Figure 9 summarize the UM3243 operating modes. FORCEON and FORCEOFF
override Auto Power-Off. When neither control is asserted, the IC will select between these states
automatically, based on receiver input levels. Figure 6 depicts valid and invalid RS-232 receiver
levels and timing diagram for Auto Power-Off operation.
Figure 9. UM3243 Auto Power-Off Logic
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UM3243
RS-232 Transmitters
The transmitters are inverting level translators that convert CMOS-logic levels to EIA/TIA-232 levels.
They guarantee a 250kbps data rate with worst-case loads of 3kΩ in parallel with 1000pF, providing
compatibility with PC-to-PC communication software. Transmitters can be paralleled to drive
multiple receivers. In Power-Off mode (See Table 1), the transmitters are disabled and the outputs are
forced into a high-impedance state.
Dual Charge Pump Voltage Converter and Capacitor Selection
The UM3243’s internal power supply consists of a regulated dual charge pump that provides output
voltages of +6V (doubling charge pump) and -6V (inverting charge pump), over the +3.0V to +5.5V
VCC range. The charge pump operates in discontinuous mode: if the output voltage is less than 6V, the
charge pump is enabled; if the output voltage exceeds 6V, the charge pump is disabled. The charge
pump requires a flying capacitor (C1, C2) and a reservoir capacitor (C3, C4) to generate the V+ and
V- supplies.
The capacitor type used for C1–C4 is not critical for proper operation; either polarized or
non-polarized capacitors may be used. The charge pump requires 0.1μF capacitors for 3.3V operation.
For other supply voltages, refer to Table 4 for required capacitor values. Do not use values smaller
than those listed in Table 4. Increasing the capacitor values (e.g., by a factor of 2) reduces ripple on
the transmitter outputs and slightly reduces power consumption. When using the minimum required
capacitor values, make sure the capacitor value does 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 4. Required Capacitor Values
VCC (V)
3.15 to 3.6
4.5 to 5.5
3.0 to 5.5
2.4 to 3.0
C1, C2, C3, C4 (μF)
0.1
0.1
0.47
0.47
High Data Rates
The UM3243 maintains the RS-232 ±5.0V minimum transmitter output voltage even at high data rates.
Figure 10 shows a transmitter loopback test circuit. Figure 11 shows a loopback test result at 120kbps,
and Figure 12 shows the same test at 250kbps. For Figure 11, all three transmitters were driven
simultaneously at 120kbps into RS-232 loads in parallel with 1000pF. For Figure 12, a single
transmitter was driven at 250kbps, and all three transmitters were loaded with an RS-232 receiver in
parallel with 1000pF.
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UM3243
Figure 10. Loopback Test Circuit
5V/div
TIN1
5V/div
TOUT1
ROUT1
5V/div
2µs/div
Figure 11. Loopback Test Result at 120kbps
Figure 12. Loopback Test Result at 250kbps
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UM3243
Package Information
UM3243EEAS: SSOP28
Outline Drawing
Symbol
A
A1
A2
b
c
D
E
E1
e
L
θ
DIMENSIONS
MILLIMETERS
INCHES
Min Typ Max Min
Typ Max
2.00
0.079
0.05
0.002
1.65 1.75
1.85 0.065 0.069 0.073
0.22 0.30
0.38 0.009 0.012 0.015
0.09 0.17
0.25 0.004 0.007 0.010
9.90 10.20 10.50 0.390 0.402 0.413
5.00 5.30
5.60 0.197 0.209 0.220
7.40 7.80
8.20 0.291 0.307 0.323
0.65BSC
0.026BSC
0.55 0.75
0.95 0.022 0.030 0.037
0°
8°
0°
8°
Land Pattern
NOTES:
1. Compound dimension: 10.20×5.30;
2. Unit: mm;
3. General tolerance ±0.05mm unless otherwise
specified;
4. The layout is just for reference.
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UM3243
UM3243EEASR: SSOP28
Outline Drawing
Symbol
A
A1
A2
b
c
D
E
E1
e
L
θ
DIMENSIONS
MILLIMETERS
INCHES
Min Typ Max Min
Typ Max
2.00
0.079
0.05
0.002
1.65 1.75
1.85 0.065 0.069 0.073
0.22 0.30
0.38 0.009 0.012 0.015
0.09 0.17
0.25 0.004 0.007 0.010
9.90 10.20 10.50 0.390 0.402 0.413
5.00 5.30
5.60 0.197 0.209 0.220
7.40 7.80
8.20 0.291 0.307 0.323
0.65BSC
0.026BSC
0.55 0.75
0.95 0.022 0.030 0.037
0°
8°
0°
8°
Land Pattern
NOTES:
1. Compound dimension: 10.20×5.30;
2. Unit: mm;
3. General tolerance ±0.05mm unless otherwise
specified;
4. The layout is just for reference.
Tape and Reel Orientation
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20/24
UM3243
UM3243EEUS: TSSOP28
Outline Drawing
Symbo
l
A
A1
A2
A3
b
c
D
E
E1
e
L
L1
L2
θ1
θ2
θ3
DIMENSIONS
MILLIMETERS
INCHES
Min Typ Max Min
Typ Max
1.20
0.047
0.05
0.15 0.002
0.006
0.80
1.05 0.031
0.041
0.34 0.44 0.54 0.013 0.017 0.021
0.19
0.30 0.007
0.012
0.09
0.20 0.004
0.008
9.60 9.70 9.80 0.378 0.382 0.386
4.30 4.40 4.50 0.169 0.173 0.177
6.20 6.40 6.60 0.244 0.252 0.260
0.65BSC
0.026BSC
0.45 0.60 0.75 0.018 0.024 0.030
1.00REF
0.039REF
0.25BSC
0.010BSC
0°
8°
0°
8°
10° 12°
14°
10°
12°
14°
10° 12°
14°
10°
12°
14°
Land Pattern
NOTES:
1. Compound dimension: 9.70×4.40;
2. Unit: mm;
3. General tolerance ±0.05mm unless otherwise
specified;
4. The layout is just for reference.
Tape and Reel Orientation
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UM3243
UM3243EESS: SOP28
Outline Drawing
DIMENSIONS
Symbol
MILLIMETERS
INCHES
Min
Typ
Max
Min
Typ
Max
A
2.35
2.55
2.80
0.093
0.100
0.110
A1
0.10
0.20
0.30
0.004
0.008
0.012
A2
2.25
-
2.65
0.089
-
0.104
b
0.33
-
0.54
0.013
-
0.021
c
0.15
-
0.33
0.006
-
0.013
D
17.40
-
18.10
0.685
-
0.713
E
7.40
7.55
7.70
0.291
0.297
0.303
E1
10.20
10.40
10.61
0.402
0.409
0.418
e
1.27BSC
0.050BSC
L
0.40
-
1.27
0.016
-
0.050
θ
0°
-
8°
0°
-
8°
Land Pattern
NOTES:
1. Compound dimension: 17.75×7.55;
2. Unit: mm;
3. General tolerance ±0.05mm unless otherwise
specified;
4. The layout is just for reference.
http://www.union-ic.com Rev.03 Jan.2018
22/24
UM3243
UM3243EEQA: QFN32 5.0×5.0
Outline Drawing
DIMENSIONS
Symbol
MILLIMETERS
INCHES
Min
Typ
Max
Min
Typ
Max
A
0.70
0.75
0.80
0.028
0.030
0.031
A1
0.00
0.02
0.05
0.000
0.0008
0.002
A3
0.20REF
0.008REF
b
0.20
0.25
0.30
0.008
0.010
0.012
D
4.90
5.00
5.10
0.193
0.197
0.201
D2
3.30
-
3.60
0.130
-
0.142
E
4.90
5.00
5.10
0.193
0.197
0.201
E2
3.30
-
3.60
0.130
-
0.142
e
0.50TYP
0.020TYP
k
0.20
-
-
0.008
-
-
L
0.324
0.40
0.476
0.013
0.016
0.019
Land Pattern
NOTES:
1. Compound dimension: 5.00×5.00;
2. Unit: mm;
3. General tolerance ±0.05mm unless otherwise
specified;
4. The layout is just for reference.
Tape and Reel Orientation
http://www.union-ic.com Rev.03 Jan.2018
23/24
UM3243
GREEN COMPLIANCE
Union Semiconductor is committed to environmental excellence in all aspects of its
operations including meeting or exceeding regulatory requirements with respect to the use of
hazardous substances. Numerous successful programs have been implemented to reduce the
use of hazardous substances and/or emissions.
All Union components are compliant with the RoHS directive, which helps to support
customers in their compliance with environmental directives. For more green compliance
information, please visit:
http://www.union-ic.com/index.aspx?cat_code=RoHSDeclaration
IMPORTANT NOTICE
The information in this document has been carefully reviewed and is believed to be accurate.
Nonetheless, this document is subject to change without notice. Union assumes no
responsibility for any inaccuracies that may be contained in this document, and makes no
commitment to update or to keep current the contained information, or to notify a person or
organization of any update. Union reserves the right to make changes, at any time, in order to
improve reliability, function or design and to attempt to supply the best product possible.
Union Semiconductor, Inc
Add: Unit 606, No.570 Shengxia Road, Shanghai 201210
Tel: 021-51093966
Fax: 021-51026018
Website: www.union-ic.com
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