UM3221E/UM3222E/UM3232E
Fail-Safe, Single Supply RS-232 Transceivers
UM3221E/UM3222E/UM3232E
General Description
The UM3221E/UM3222E/UM3232E series are 3.3V powered RS-232 transceivers intended for
portable or hand-held applications. The UM3221E has one driver/one receiver while the
UM3222E/UM3232E has two drivers/two receivers. The device features low power consumption,
high data-rate capability and enhanced ESD protection. The ESD rating of all transmitter outputs
and receiver inputs is ±15kV for both human body mode and IEC61000-4-2 air discharge methods,
and over ±8kV for IEC61000-4-2 contact discharge methods. The logic I/O pins are protected to
±2kV for human body mode.
Small footprint, low profile package and the use of small 0.1μF capacitors ensure board space
savings as well. Data rates greater than 250kbps are guaranteed at worst case load conditions. This
family is fully compatible with 3.3V-only systems, mixed 1.8V and 3.3V systems, mixed 3.3V and
5.0V systems and 5.0V-only systems.
The UM3221E/UM3222E has a low-power shutdown mode where the devices’ driver outputs and
charge pumps are disabled. During shutdown, the supply current falls to less than 1μA that
reduces power consumption in battery-powered portable systems or other low power consumption
systems. The UM3221E/UM3222E receivers remain active in shutdown mode, allowing
monitoring of external signals.
The UM3221E/UM3222E and UM3232E are pin, package, and functionally compatible with the
industry standard MAX242 and MAX 232, respectively.
Applications
Features
z
z
z
z
z
Industrial Automation Equipments
Battery-Powered Equipments
Hand-Held Equipments
POS Terminals
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
Enhanced ESD Specifications:
±15kV Human Body Mode
±15kV IEC61000-4-2 Air Discharge Mode
±8kV IEC61000-4-2 Contact Discharge Mode
1μA Low Power Shutdown
(UM3221E/UM3222E)
250kbps Minimum Transmission Rate
Guaranteed 30V/μs Max Slew Rate
Latch-Up Performance Exceeds 200mA
Hot Swap and Fail-Safe
I/O Logic Compatible with 1.8V Logic @
VCC=3.3V
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UM3221E/UM3222E/UM3232E
Ordering Information
Part Number
Temp. Range
Package Type
UM3221EEAE
-40°C to +85°C
SSOP16
UM3221EEUE
-40°C to +85°C
TSSOP16
UM3222EEUE
-40°C to +85°C
TSSOP20
UM3232EESE
-40°C to +85°C
SOP16
UM3232EEPE
-40°C to +85°C
DIP16
UM3232EEUE
-40°C to +85°C
TSSOP16
UM3232EEAE
-40°C to +85°C
SSOP16
Shipping Qty
2000pcs/13 Inch
Tape & Reel
3000pcs/13 Inch
Tape & Reel
3000pcs/13 Inch
Tape & Reel
2500pcs/13 Inch
Tape & Reel
25pcs/Tube
3000pcs/13 Inch
Tape & Reel
2000pcs/13 Inch
Tape & Reel
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UM3221E/UM3222E/UM3232E
Pin Configurations
Top View
XX: Week Code
UM3221EEAE
SSOP16
SSOP16/TSSOP16
XX: Week Code
UM3221EEUE
TSSOP16
TSSOP20
XX: Week Code
UM3222EEUE
TSSOP20
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UM3221E/UM3222E/UM3232E
Pin Configurations
Top View
XX: Week Code
UM3232EESE
SOP16
XX: Week Code
UM3232EEPE
DIP16
SOP16/DIP16/TSSOP16/SSOP16
XX: Week Code
UM3232EEUE
TSSOP16
XX: Week Code
UM3232EEAE
SSOP16
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UM3221E/UM3222E/UM3232E
Pin Description
UM3221E
1
Pin No.
UM3222E
1
UM3232E
-
2
2
1
C1+
3
3
2
V+
4
4
3
C1-
5
5
4
C2+
6
6
5
C2-
7
7
6
V-
13
8
9
11
14
15
8, 17
9, 16
10, 15
12, 13
18
19
7, 14
8, 13
9, 12
10, 11
15
16
T_OUT
R_IN
R_OUT
T_IN
GND
VCC
16
20
-
Pin Name
Function
______
Receiver Enable. Active low.
Positive Terminals of Voltage-Doubler
Charge Pump Capacitor
Positive Voltage Generated by the
Charge Pump
Negative Terminals of Voltage-Doubler
Charge Pump Capacitor
Positive Terminals of Inverting Charge
Pump Capacitor
Negative Terminals of Inverting Charge
Pump Capacitor
Negative Voltage Generated by the
Charge Pump
RS-232 Driver Outputs
RS-232 Receiver Inputs
RS-232 Receiver Outputs
RS-232 Driver Inputs
Ground
+3.0V to +5.5V Supply Voltage Input
Shut off Pump Power and Transmitters.
Active low.
EN
____________
SHDN
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UM3221E/UM3222E/UM3232E
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
T_IN
Voltage on T_IN
-0.3 to (VCC+0.3)
V
R_IN
Voltage on R_IN
±30
V
T_OUT
Voltage on T_OUT
(V--0.3) to (V++0.3)
V
R_OUT
Voltage on R_OUT
-0.3 to (VCC+0.3)
V
Short-Circuit Duration, T_OUT
Continuous
PD
Continuous Power Dissipation at
TA=70°C
SSOP16
775
TSSOP20
879
SOP16
696
DIP16
842
TSSOP16
754
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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UM3221E/UM3222E/UM3232E
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
DC CHARACTERISTICS ( VCC=+3.3V
or +5V, TA=25°C)
____________
VCC Supply Current
ICC
SHDN =VCC, No Load
____________
Shutdown Supply
ISHDN
SHDN =GND
Current
LOGIC INPUTS
____________ ______
Input Leakage
T_IN, SHDN , EN
Current
VCC=3.3V
T_IN,
____________ ______
Input Threshold Low
VIL
SHDN , EN
VCC=5.0V
Min
VCC=3.3V
1.6
VCC=5.0V
2.2
Input Threshold High
VIH
T_IN,______
SHDN , EN
____________
Max
Unit
1.5
mA
1
μA
±1
μA
0.8
0.8
VCC=3.3V
VCC=5.0V
Transmitter
Input Hysteresis
Typ
V
V
0.2
0.15
V
RECEIVER OUTPUTS
Output Voltage Low
VOL
Output Voltage High
VOH
VCC=3.3V, IOUT=10mA
VCC=5.0V, IOUT=10mA
VCC=3.3V, IOUT=-3.0mA
VCC=5.0V, IOUT=-3.0mA
RECEIVER INPUTS
Input Voltage Range
-30
0.8
0.8
30
3
All Drivers Loaded with
3kΩ to Ground
±5.0
±6.0
Input Threshold High
TA=+25°C
Short to
VCC , GND
or Other
TXD Pin
V
V
TA=+25°C
TA=+25°C
Output Short-Circuit
Current
2.8
4.4
1.15
1.55
1.35
1.75
0.2
5
Input Threshold Low
Input Hysteresis
Input Resistance
TRANSMITTER OUTPUTS
Output Voltage
Swing
VCC=3.3V
VCC=5.0V
VCC=3.3V
VCC=5.0V
0.8
0.8
V
V
2
2
7
V
V
kΩ
V
VCC=3.3V
±30
±60
mA
VCC=5.0V
±40
±60
mA
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UM3221E/UM3222E/UM3232E
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
TIMING CHARACTERISTICS
Maximum Data Rate
Receiver Propagation
Delay
tPLH, tPHL
Receiver Skew
|tPHL-tPLH|
Transmitter
Propagation Delay
tPLH, tPHL
Transmitter Skew
|tPHL-tPLH|
Conditions
Min
RL=3kΩ to 7kΩ,
CL=50pF to 1000pF,
One Transmitter Switching
All Parts,
CL=150pF
Normal
Figure 1
Operation
Typ
Max
250
kbps
0.15
μs
0.1
RL=3kΩ,
CL=2500pF,
All Transmitters Loaded
Figure 1
TA=+25°C, VCC=3.3V,
RL=3kΩ to 7kΩ,
Transition-Region
CL=50pF to 1000pF,
Slew Rate
Measured from -3V to +3V
or +3V to -3V,
Figure 1
ESD AND LATCH UP PERFORMANCE
Human Body Model
R_IN, T_OUT
IEC61000-4-2,
ESD-Protection
Contact Discharge
Voltage
IEC61000-4-2,
Air-Gap Discharge
Logic Pin
Human Body Model
ESD-Protection
Voltage
Latch Up
JEDEC Standard No.78D
Performance
0.9
3
Unit
15
μs
μs
0.1
μs
30
V/μs
±15
±8
kV
±15
±2
kV
±200
mA
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UM3221E/UM3222E/UM3232E
Detailed Description
Dual Charge-Pump Voltage Converter
The UM3221E/UM3222E/UM3232Es’ internal power supply consists of a regulated dual charge
pump and provides output the maxim voltages of +7V (doubling charge pump) and -7V (inverting
charge pump) over the +3.0V to +5.5V VCC range. The charge pump operates in discontinuous
mode; if the output voltages are less than 7V, the charge pump is enabled, and if the output
voltages exceed 7V, the charge pump is disabled. The charge pumps require only four small,
external 0.1μF capacitors for the voltage doubler and inverter functions (see Figure 2).
RS-232 Transmitters
The transmitters are inverting level translators that translate TTL/CMOS inputs to EIA/TIA-232
output levels. All UM3221E/UM3222E/UM3232E transmitters guarantee a 250kbps data rate for
full load conditions (3kΩ and 1000pF). Transmitters can be paralleled to drive multiple receivers.
When T_IN is not driven, UM3221/UM3222 will keep logic high, while UM3232’s T_IN logic
level is on hold.
RS-232 Receivers
The receivers convert RS-232 signals to CMOS output levels and accept inputs up to ±30V while
presenting the required 3kΩ to 7kΩ______
input impedance. The UM3221E/UM3222E receivers have
high impedance state.
inverting three-state outputs. Drive EN high to place the receivers into a______
Receivers can be either active or inactive in shutdown state depending on EN status.
UM3221E/UM3222E
____________
Supply current falls to less than 1μA in shutdown mode (SHDN = GND). When shutdown, the
device’s charge pumps are shut off, V+ is pulled down to VCC, V- is pulled to ground, and the
transmitter outputs are disabled
(high impedance). The time required to recover
____________
____________from shutdown is
typically 100μs. Connect SHDN to VCC if shutdown mode is not used. SHDN has no effect on
R_OUT.
±15kV ESD Protection
All pins on UM3221E/UM3222E/UM3232E devices include ESD protection structures, but the
family incorporates advanced structures which 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 are typically connected to an exposed port on the exterior of the
finished product. The ESD structures withstand high ESD in all states: normal operation,
shutdown and powered down. After an ESD event, circuits keep working without latch up. ESD
protection can be tested in various ways; the transmitter outputs and receiver inputs are
characterized for protection to the following limits: ±15kV using the Human Body Model, ±8kV
using the Contact Discharge method specified in IEC61000-4-2, ±15kV using the Air-Gap
Discharge method specified in IEC61000-4-2. The logic pins are characterized for protection to
the following limit: ±2kV using the Human Body Model.
Hot Swap and Fail-Safe
The UM3221E/UM3222E/UM3232E guarantees a logic-high receiver output when the receiver
inputs are shorted to GND or open, or when they are connected to a line with no driver enabled.
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UM3221E/UM3222E/UM3232E
Because of the latch-up characteristics and all sort protection, UM3221E/UM3222E/UM3232E
support hot swap.
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UM3221E/UM3222E/UM3232E
Test Circuits
Figure 1
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UM3221E/UM3222E/UM3232E
Typical Operating Circuits
+3.3V
+3.3V
C5
+
+
C5
19
15
2
C1
+
4
5
C2
+
6
VCC
C1+
V+
2
3
C3
C1C2+
UM3221E
V-
+
+
C1
4
C4
7 +
5
+
C2
6
C2-
VCC
C1+
C1C2+
UM3222E
C4
7 +
C2-
400k
T1OUT 13
11 T1IN
9
V-
+
+3.3V
400k
TTL/CMOS
OUTPUT
3
C3
+3.3V
TTL/CMOS
INPUT
V+
R1IN
R1OUT
8
5k
T1OUT 17
13 T1IN
RS-232
OUTPUT
+3.3V
TTL/CMOS
INPUTS
RS-232
OUTPUTS
400k
RS-232
INPUT
T2OUT
12 T2IN
R1IN 16
15 R1OUT
1 EN
SHDN
5k
TTL/CMOS
OUTPUTS
16
8
R2IN
10 R2OUT
GND
14
5k
1 EN
SHDN
9
20
GND
18
+3.3V
C5
+
16
1
C1
C2
+
C1+
C14
C2+
5
V+
2
C3
3
+
VCC
UM3232E
V-
+
C4
6 +
C2-
T1OUT 14
11 T1IN
RS-232
OUTPUTS
TTL/CMOS
INPUTS
T2OUT
10 T2IN
7
R1IN 13
12 R1OUT
5k
TTL/CMOS
OUTPUTS
9
R2IN
R2OUT
8
RS-232
INPUTS
5k
GND
15
Figure 2
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RS-232
INPUTS
UM3221E/UM3222E/UM3232E
Typical Operating Characteristics
(VCC=+3.3V, 250kbps data rate, 0.1μF 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
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
-4
-4
-6
-6
-8
V-
-8
2
2.5
3
3.5
4
4.5
2.4
5
2.8
3.2
3.6
4
4.4
4.8
5.2
5.6
6
Supply Voltage (V)
Supply Voltage(V)
Transmitter Output Voltage vs. Load Capacitance
Supply Current vs.Supply Voltage
8
Transmitter Output Voltage(V)
35
30
Supply Current(mA)
V+
Transmitting at 250kbps
CL=1000pF
0
25
Transmitting at 250kbps
CL=1000pF
20
6
4
2
VOUT+
0
VOUT-
Transmitting at 20kbps
-2
-4
-6
-8
15
2
2.5
3
3.5
4
4.5
Supply Voltage(V)
5
5.5
6
0
500
1500
2000
2500
3000
Load Capacitance (pF)
Supply Current vs. Load Capacitance
Slew Rate vs. Load Capacitance
25
30
+Slew
25
23
Supply Current (mA)
-Slew
Slew Rate (V/us)
1000
20
15
10
19
17
Transmitting at 20kbps
5
21
Transmitting at 20kbps
15
0
0
500
1000
1500
2000
Load Capacitance (pF)
2500
3000
0
500
1000
1500
2000
2500
Load Capacitance (pF)
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3000
UM3221E/UM3222E/UM3232E
Applications Information
Capacitor Selection
The capacitor type used for C1–C4 is not critical for proper operation; polarized or non-polarized
capacitors can be used. The charge pump requires 0.1μF capacitors for 3.3V operation. Increasing
the capacitor values (e.g. by a factor of 2) reduces ripples on the transmitter outputs and slightly
reduces power consumption. C2, C3 and C4 can be increased without changing C1’s value. 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), which usually rises at low temperatures, influences
the amount of ripples on V+ and V- output voltages.
The following table shows some recommended minimum required pump capacitor values for
different input voltage ranges.
Minimum Required Pump Capacitor Value
Input Voltage VCC
Charge Pump Capacitor Value for UM32XX
2.7V to 3.6V
C1–C4=0.1μF
3.6V to 5.5V
C1–C4=0.47μF
2.7V to 5.5V
C1–C4=0.47μF
Power Supply Decoupling
In most circumstances, a 0.1μF VCC bypass capacitor is adequate. In applications sensitive to
power-supply noise, use a capacitor of the same value as charge pump capacitor C1. Connect
bypass capacitors to the IC as close as possible.
Operation down to 2.7V
Transmitter outputs meet EIA/TIA-562 levels of ±3.7V with supply voltages as low as 2.7V.
Interconnection with 3V and 5V Logic
The UM3221E/UM3222E/UM3232E can directly interface with various 3V and 5V logic families,
including ACT and HCT CMOS.
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UM3221E/UM3222E/UM3232E
Package Information
UM3232EESE SOP16
Outline Drawing
Symbol
A
A1
A2
b
c
D
E
E1
e
L
θ
DIMENSIONS
MILLIMETERS
INCHES
Min Typ Max Min
Typ Max
1.35 1.60
1.75 0.053 0.063 0.069
0.10
0.25 0.004
0.010
1.25 1.45
1.65 0.049 0.057 0.065
0.33
0.51 0.013
0.020
0.17
0.25 0.007
0.010
9.80 10.00 10.20 0.386 0.394 0.402
3.80 3.90
4.00 0.150 0.154 0.157
5.80 6.00
6.20 0.228 0.236 0.244
1.27BSC
0.050BSC
0.40
1.27 0.016
0.050
0°
8°
0°
8°
6.80
1.87
Land Pattern
NOTES:
1. Compound dimension: 10.00×3.90.
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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UM3221E/UM3222E/UM3232E
UM3232EEPE DIP16
Outline Drawing
Symbol
A
A1
A2
b
b1
c
D
E
E1
E2
e
L
DIMENSIONS
MILLIMETERS
INCHES
Min
Typ Max Min
Typ Max
3.71
4.01
4.31 0.146 0.158 0.170
0.51
0.020
3.20
3.40
3.60 0.126 0.134 0.142
0.38
0.48
0.57 0.015 0.019 0.022
1.52BSC
0.060BSC
0.20
0.28
0.36 0.008 0.011 0.014
18.80 19.00 19.20 0.740 0.748 0.756
6.20
6.40
6.60 0.244 0.252 0.260
7.32
7.62
7.92 0.288 0.300 0.312
8.40
8.70
9.00 0.331 0.343 0.354
2.54BSC
0.100BSC
3.00
3.30
3.60 0.118 0.130 0.142
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UM3221E/UM3222E/UM3232E
UM3221EEUE/UM3232EEUE TSSOP16
Outline Drawing
Symbol
D
Pin #1 ID
e
b
Top View
c
End View
θ2
θ1
L
Side View
L1
θ3
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
4.86 4.96 5.10 0.191 0.195 0.201
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: 4.96×4.40.
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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UM3221E/UM3222E/UM3232E
UM3222EEUE TSSOP20
Outline Drawing
Symbol
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
6.40 6.50 6.60 0.252 0.256 0.260
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: 6.50×4.40.
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.12 Nov.2018
18/20
UM3221E/UM3222E/UM3232E
UM3221EEAE/UM3232EEAE SSOP16
Outline Drawing
DIMENSIONS
Symbol
MILLIMETERS
INCHES
A
Min
-
Typ
-
Max
2.00
Min
-
Typ
-
Max
0.079
A1
0.05
-
-
0.002
-
-
A2
1.65
1.75
1.85
0.065
0.069
0.073
b
0.22
0.30
0.38
0.009
0.012
0.015
c
0.09
0.17
0.25
0.004
0.007
0.010
D
5.90
6.20
6.50
0.232
0.244
0.256
E
5.00
5.30
5.60
0.197
0.209
0.220
E1
7.40
7.80
8.20
0.291
0.307
0.323
e
0.65BSC
0.026BSC
L
0.55
0.75
0.95
0.022
0.030
0.037
θ
0°
-
8°
0°
-
8°
Land Pattern
NOTES:
1. Compound dimension: 6.20×5.30.
2. Unit: mm.
3. General tolerance ±0.05mm unless otherwise
specified.
4. The layout is just for reference.
Tape and Reel Orientation
________________________________________________________________________
http://www.union-ic.com Rev.12 Nov.2018
19/20
UM3221E/UM3222E/UM3232E
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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20/20
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