2004 Microchip Technology Inc. DS21434G-page 1
TC54
Features
• Precise Detection Thresholds: Standard ±2.0%,
Custom ±1.0%
• Small Packages: 3-Pin SOT-23A, 3-Pin SOT-89,
TO-92 and 5-Pin SOT-23A (7.7V only)
• Low Current Drain: Typ. 1 µA
• Wide Detection Range: 1.1V to 6.0V and 7.7V
• Wide Operating Voltage Range: 0.7V to 10V
Applications
• Battery Voltage Monitoring
• Microprocessor Reset
• System Brown-Out Protection
• Switching Circuit in Battery Backup
• Level D iscriminato r
Functional Block Diagram
General Descripti on
The TC54 series are CMOS voltage detectors that are
especially well suited for battery-powered applications
because of their extremely low 1 µA operating current
and small surface-mount packaging. Each part is laser-
trimmed to the de sired th reshol d volt age , whic h can be
specif ied from 1. 4V to 7.7V fo r a 2% tol erance and from
1.5V to 6.0V for a 1% tolerance.
The device includes a comparator, low-current high-
precision reference, laser-trimmed divider, hysteresis
circuit and output driver. The TC54 is available with
either an open-drain or complementary output stage.
During operation, the TC54's output (VOUT) remains in
the logic-high state as long as VIN is greater than the
specified threshold voltage (VDET –). When VIN falls
below VDET –, the output is driven to a logic-low. VOUT
remains low u ntil VIN rises above VDET – by an am ount
VHYST, whereupon it resets to a logic-high.
Package Types
VOUT
TC54VC onl
y
VSS
1
3
+
–
VIN
2
TC54VN has open-drain output.
TC54VC has complementary output.
VREF
1 32
VIN VSS
VOUT
TC54
3-Pin SOT-89
5
5-Pin SOT-23A
TC54
13
4
2
NC NC
Note: 3-Pin SOT-23A is equivalent to the
EIAJ SC-59
5-Pin SOT-23A is equivalent to the
EIAJ SC-74A. (7.7V ONLY)
3-Pin TO -92
123
VSS
VIN
VOUT
VIN
VOUT VSS
3
12
TC54
3-Pin SOT-23A
VIN
VIN VSS
VOUT
VOUT VSS
Voltage Detector
TC54
DS21434G-page 2 2004 Microchip Technology Inc.
1.0 ELECTRICAL
CHARACTERISTICS
Absolute Maximum Ratings †
Input Voltage................ ...... ............. ...... ............. ...... .......+12V
Output Cu rr e n t ....... ................. ...... ................. ...... .........50 mA
Output Voltage: CMOS................(VSS – 0.3V) to (VIN + 0.3V)
Open-Drain.....................(VSS – 0.3V) to 12V
Power Dissipation (TA ≤ 70°C):
3-Pin SOT-23A ....... ...... ....... ...... ...... ................. ......240 mW
3-Pin SOT-89............ ...... ....... ................. ...... ..........500 mW
5-Pin SOT-23A ....... ...... ....... ...... ...... ................. ......240 mW
3-Pin T O-92.......... ................. ...... ................. ...... ....300 mW
Operating Temperature Range........................-40°C to +85°C
Storage Temperature Range.........................-65°C to +150°C
† Stresses above those listed under "Absolute Maximum
Ratings" may cause permanent damage to the device. These
are stress ratings only and funct ional operation of the device
at these or any other conditions above those indicated in the
operation sections of the specifications is not implied.
Exposure to Absolute Maximum Rating conditions for
extended periods may affect device reliability.
PIN FUNCTION TABLE
DC CHARACTERISTICS
Symbol Description
VOUT Digital Output
VIN Analog Input
VSS Ground Terminal
NC No Connect
NC No Connect
Electrical Specifications: Unless otherwise noted, TA = +25°C.
Parameter Sym Min Typ Max Units Test Conditions
Operating Voltage VIN 0.7 — 10.0 V (VDET –) = 0.8 to 6.0V
Quiescent Current ISS —0.82.7µAV
IN = 2.0V
—0.93.0 V
IN = 3.0V
—1.03.2 V
IN = 4.0V
—1.13.6 V
IN = 5.0V
Threshold Voltage
(Note 1) VDET –1.37 1.4 1.43 V TC54VX14
2.06 2.1 2.14 TC54VX21
2.65 2.7 2.75 TC54VX27
2.84 2.9 2.96 TC54VX29
2.94 3.0 3.06 TC54VX30
4.12 4.2 4.28 TC54VX42
4.21 4.3 4.39 TC54VX43
7.54 7.7 7.86 TC54VX77 (5-pin SOT-23A only)
Hysteresis Voltage VHYST 28 70 112 mV VDET = 1.4V (typ)
42 105 168 VDET = 2.1V (typ)
54 135 216 VDET = 2.7V (typ)
58 145 232 VDET = 2.9V (typ)
60 150 240 VDET = 3.0V (typ)
84 210 336 VDET = 4.2V (typ)
86 215 344 VDET = 4.3V (typ)
154 385 616 VDET = 7.7V (typ)
Output Current IOUT —7.7—mAV
OL = 0.5V, VIN = 2.1V
—10.1— V
IN = 3.0V
—11.5— V
IN = 4.0V
—13.0— V
IN = 5.0V
— -10.0 — TC54VC Only:
VOH = VIN – 2.1V, VIN = 8.0V
Tempco of (VDET–) TC (VDET –) — ±100 — ppm/°C -40°C ≤ TA ≤ 85°C
Delay Time tDLY ——0.2msV
DET – → VOUT inve r s i on
Note 1: For other voltage options, please contact your regional Microchip sales office.
2004 Microchip Technology Inc. DS21434G-page 3
TC54
FIGURE 1-1: Timing Diagram.
VDD
OUTPUT VOH
tDLY
VDET –
OUTPUT
TC54
DS21434G-page 4 2004 Microchip Technology Inc.
2.0 PIN DESCRIPTIONS
The descriptions of the pins are listed in Table 2-1.
TABLE 2-1: PIN FUNCTION TABLE
2.1 Digital Output (VOUT)
VOUT goes low when VIN drops below VDET – and
returns high when VIN rises above VDET – + VHYST.
(See Figure 3-1).
2.2 Analog Input (VIN)
VIN can be used for power supply monitoring or a
voltage level that requires monitoring.
2.3 Ground Terminal (VSS)
VSS provides the negative reference for the analog
input voltage. Typic ally, the circuit ground is used.
2.4 No Connect (NC)
No interna l conn ec tio n.
Pin No.
(3-Pin SOT-23A)
Pin No.
(3-Pin SOT-89)
(3-Pin TO-92)
Pin No.
(5-Pin SOT-23A) Symbol Description
111V
OUT Digital Output
322V
IN Analog Input
233V
SS Ground Terminal
— — 4 NC No Connect
— — 5 NC No Connect
2004 Microchip Technology Inc. DS21434G-page 5
TC54
3.0 DETAILED DESCRIPTION
In normal steady-state operation when VIN > VDET –,
the output will be at a logic-high (see Figure 3-1). In
the case of the TC54VN, this is an open-drain
condition. If the input falls below VDET –, the output
will pull down (Logic 0) to VSS. Generally, VOUT can
pull down to within 0.5V of VSS at rated outpu t curr ent
and input voltage. (See Section 1.0 “Electrical
Characteristics”).
The output (VOUT) will stay valid until the input voltage
falls below the minimum operating voltage (VINMIN) of
0.7V. Below this minimum operating voltage the output
is undefined. During power-up (or anytime VIN has
fallen below VINMIN), VOUT will remain undefined until
VIN rises above VINMIN. Once this occurs, the output
will become valid. VOUT will be in its active-low state,
while VINMIN < VIN < VDET+ (therefore, VDET+ = VDET –
+ VHYST). If th e input rise s above V DET+, the output wil l
assum e it s i nactive st ate (h igh for T C54VC, open -drain
for TC54VN).
FIGURE 3-1: Timing Diagram.
VIN
Detect Voltage VDET –
Minimum Ope rating
Voltage
VHYST
VDET +
Output Voltage
Release Voltage
or RESET Voltage
Ground Level
Ground Lev el
VOUT
TC54
DS21434G-page 6 2004 Microchip Technology Inc.
4.0 APPLICATIONS INFORMATION
4.1 Modifying The Trip Point, VDET –
Although th e TC54 has a pre -pro gram m ed VDET –, it is
someti mes ne cessary to make adjustm ents d uring pr o-
totyping. This can be accomplished by connecting an
external res is to r di vider to a TC54, which has a VDET –
lower than that of VSOURCE (Figure 4-1).
To maintain detector accuracy, the bleeder current
through the divider should be significantly higher than
the 1 µA operating current required by the TC54. A
reasonable value for this bleeder current is 100 µA (100
times the 1 µA required by the TC54). For example, if
VDET – = 2V and the desired trip point is 2.5V, the value
of R1 + R2 is 25 kΩ (2.5V/100 µA). The value of R1 + R2
can be rounded to the nearest standard value and
plugged into the equation of Figure 4-1 to calculate
values for R1 and R2. 1% tolerance resistors are
recommended.
FIGURE 4-1: Modify trip-point of the TC54
using external resistor divider.
4.2 Other Applications
Low operating powe r and small physical size make th e
TC54 series ideal for many voltage detector applica-
tions, such as those shown in Figures 4-2, 4-3 and 4-4.
Figure 4-2 shows a low-voltage gate drive protection
circuit that prevents overheating of the logic-level
MOSFET due to insufficient gate voltage. When the
input signal is below the threshold of the TC54VN, its
output grounds the gate of the MOSFET . Figure 4-3 and
Figure 4-4 show the TC54 in conventional voltage
monitoring application s.
FIGURE 4-2: MOSFET Low Drive
Protection.
FIGURE 4-3: Battery Voltage Monitor.
FIGURE 4-4: Power Good Monitor.
Where:
VSOURCE = Voltage to be monitored
(VDET –) = Threshold Voltage setting of TC54
Note: In this example, VSOURCE must be
greater than (VDET –)
VSOURCE
R1
R1R2
+
--------------------VDET-==
TC54
VIN VOUT
VSS
R1
VSOURCE
R2
VIN
VOUT
VSS
TC54VX
270Ω
MTP3055EL
VCC
RL
4.3V
VIN
VOUT
VSS
BATLOW
TC54VX
+
––
VIN
VOUT
VSS
Power Good
TC54VX
+
–
Pwr
Sply
2004 Microchip Technology Inc. DS21434G-page 7
TC54
5.0 PACKAGING INFORMATION
5.1 Package Marking Information
Symbol Output Voltage
BCMOS1.
CCMOS2.
DCMOS3.
ECMOS4.
FCMOS5.
HCMOS6.
ICMOS7.
Symbol Output Voltage
LNch1.
MNch2.
NNch3.
PNch4.
RNch5.
SNch6.
TNch7.
Symbol Voltage Symbol Voltage
0.06.6
1.17.7
2.28.8
3.39.9
4.4
5.5
3-Pin SOT-23A 3-Pin SOT-89
11
2
2
43
4
3
1
represents output configuration (CMOS or Nch)
and first integer of voltage
Ex: CMOS 3.x = D
2
represents first decimal of output voltage (0-9)
Ex: CMOS 3.x = D4
43 represents assembly lot code
&
Symbol Output Voltage
TNch7.
Symbol Voltage
0.0
1.1
2.2
3.3
4.4
5.5
6.6
7.7
8.8
9.9
5-Pin SOT-23A
1243
1
represents ou tput config uration and first int eger
of voltage
2
represents first decimal of output voltage
4
3represents assembly lot code
&
TC54
DS21434G-page 8 2004 Microchip Technology Inc.
Package Marking Information (Continued)
Symbol Output
CCMOS
N N-Channel
Symbol Voltage
22.
33.
44.
55.
66.
Symbol Voltage Symbol Voltage
0.05.5
1.16.6
2.27.7
3.38.8
4.49.9
Symb ol Delay T im e
0No Delay
Symbol Accuracy
1 ±1.0% (custom)
2 ±2.0% (standard)
3-Pin TO-92
8
4
7
3
6
2
5
1
= 54X (fixed)
1 , 2 , & 3
4
represents output configuration (CMOS or Nch)
Ex: CMOS 3.x = C
5represents first integer of detect voltage
6represents first decimal o f detect voltage
7represents the output Delay Time
respresen t s the dev ic e ac c uracy
8
2004 Microchip Technology Inc. DS21434G-page 9
TC54
3-Lead Plastic Small Outline Transistor (CB) (SOT23A)
0.50–0.30.019–.012BLead Width 0.35–0.10.014–.004
c
Lead Thickness –
φ
Foot Angle 0.55–0.35.022–.014LFoot Length 3.10–2.70.122–.106DOverall Length 1.80–1.40.071–.055E1Molded Packag e Widt h 3.00–2.50.118–.098EOverall Width 0.10–0.00.004–.000A1Standoff 1.30–0.90.051–.035A2Molded Package Thickness 1.40–0.90.055.035AOverall Height 1.90.075
p1
Outside lead pitch (basic) 0.95.037
p
Pitch 33
n
Number of Pins MAXNOMMINMAXNOMMINDimension Limits MILLIMETERS*INCHES
Units
2
1
p
D
B
n
E
E1
L
c
φ
A2
A
A1
p1
Dimensions D and E1 do not include mold flash or protrusions. Mold flash or protrusions shall not exceed
.005" (0.127mm) per si de.
Notes:
EIAJ Equivalent: SC-59
Drawing No. C04-130
*Controlling Parameter
.067 .083 1.70 2.10
10010–0
TC54
DS21434G-page 10 2004 Microchip Technology Inc.
3-Lead Plastic Small Outline Transistor (MB) (SOT89)
0.560.43.022.017BLead 2 Width
0.440.35.017.014
c
Lead Thickness
1.831.62.072.064D1Tab Length
4.604.40.181.173DOverall Length
2.292.13.090.084E1
Molded Package Width at Top
4.253.94.167.155HOverall Width
1.601.40.063.055AOverall Height
3.00 BSC.118 BSC
p1
Outside lead pitch (basic)
1.50 BSC.059 BSC
p
Pitch
MAXMINMAXMINDimension Limits
MILLIMETERS*INCHESUnits
shall not exceed .005" (0.127mm) per side.
Notes:
JEDEC Equivalent: TO-243
Drawing No. C04-29
*Controlling Parameter
Foot Length L .035 .047 0.89 1.20
Leads 1 & 3 Width B1 .014 .019 0.36 0.48
Molded Package Width at Base
E .090 .102 2.29 2.60
Tab Corner Radii R 0.254.010
Revised 07-24-03
p1
p
A
C
E
H
DD1
B1
L
E1
B1
B
1
2
3
R
Dimensions D and E1 do not include mold or flash protrusions. Mold flash or protrusions
2004 Microchip Technology Inc. DS21434G-page 11
TC54
5-Lead Plastic Small Outline Transistor (CT) (SOT23)
10501050
β
Mold Draft Angle Bottom
10501050
α
Mold Draft Angle Top
0.500.430.35.020.017.014BLead Width
0.200.150.09.008.006.004
c
Lead Thickness
10501050
φ
Foot Angle
0.550.450.35.022.018.014LFoot Length
3.102.952.80.122.116.110DOverall Length
1.751.631.50.069.064.059E1Molded Package Width
3.002.802.60.118.110.102EOverall Width
0.150.080.00.006.003.000A1Standoff
1.301.100.90.051.043.035A2Molded Package Thickness
1.451.180.90.057.046.035AOverall Height
1.90.075
p1
Outside lead pitch (basic)
0.95.038
p
Pitch
55
n
Number of Pins
MAXNOMMINMAXNOMMINDimension Limits
MILLIMETERSINCHES*Units
1
p
D
B
n
E
E1
L
c
β
φ
α
A2
A
A1
p1
exceed .005" (0.127mm) per side.
Dimensions D and E1 do not include mold flash or protrusions. Mold flash or protrusions shall not
Notes:
EIAJ Equivalent: SC-74A
Drawing No. C04-091
*Controlling Parameter
TC54
DS21434G-page 12 2004 Microchip Technology Inc.
3-Lead Plastic Transistor Outline (ZB) (TO-92)
432432
β
Mold Draft Angle Bottom 654654
α0.560.480.41.022.019.016BLead Width 0.510.430.36.020.017.014
c
Lead Thickness
2.412.292.16.095.090.085RMolded Package Radius 4.954.644.32.195.183.170DOverall Length 4.954.714.45.195.186.175E1Overall Width 3.943.623.30.155.143.130ABottom to Package Flat 1.27.050
p
Pitch 33
n
Number of Pins MAXNOMMINMAXNOMMINDimen si on Limits MILLIMETERSINCHES*Units
R
n
1
3
α
p
L
B
A
c
β
1
D
2
E1
T ip to Seating Plane L .500 .555 .610 12.70 14.10 15.49
*Controlling Parameter
Mold Draft Angle Top
Notes:
Dimensions D and E1 do not include mold flash or protrusions. Mold flash or protrusions shall not exceed
.010” (0.254mm) per side.
JEDEC Equivalent: TO-92
Drawing No. C04-101
2004 Microchip Technology Inc. DS21434G-page 13
TC54
PRODUCT IDENTIFICATION SYSTEM
To order or obtain information, e.g., on pricing or delivery, refer to the factory or the listed sales office.
Sales and Support
Device: TC54V: Voltage Detector
Output C onf iguration : N = Nch Open-Dr ain
C = CMOS Output
Detected Voltage: 14 = 1.4V
21 = 2.1V
27 = 2.7V
29 = 2.9V
30 = 3.0V
42 = 4.2V
43 = 4.3V
Extra Feature C ode : 0 = Fixed
Tolerance: 1 = 1% (custom)
2 = 2% (standard )
Temperature: E = -40°C to +85°C
Package: CB = 3-Pin SOT-23A (equivalent to EIAJ SC-59)
MB = 3-Pin SOT-89
CT = 5-Pin SOT-23A (equivalent to EIAJ SC-74A)
(7.7V ONLY)
ZB = Transistor Outline (TO-92), 3-lead
Taping Direction: 713 = Standard Taping
PART NO. XXX
PkgOutput
Config.
Device
XX
Detected
Voltage
X
Extra
Feature
Code
X
Tolerance
X
Temp.
XX
Taping
Direction
Examples:
a) T C54VC1402ECB713: 1.4V Voltage
Detector, 2% Tol.,
SOT-23A-3-TR.
b) TC54VC1402EMB713:1.4V Voltage
Detector,
2% Tol.,
SOT-89-3-TR.
c) TC54VC1402EZB : 1.4V Voltage
Detector,
2% Tol., TO-92.
d) T C54V C2102ECB713: 2. 1V Voltage
Detector,
2% Tol.,
SOT-23A-3-TR.
e) T C54V C2102EM B713 :2.1V Voltage
Detector,
2% Tol.,
SOT-89-3-TR.
f) TC54VC2102EZB : 2.1V Voltage
Detector,
2% Tol., TO-92.
g) T C54V C2702ECB713: 2. 7V Voltage
Detector,
2% Tol.,
SOT-23A-3-TR.
h) T C54V C3002ECB713: 3. 0V Voltage
Detector,
2% Tol.,
SOT-23A-3-TR.
i) TC54VN4202EC B713: 4.2V Voltage
Detector,
2% Tol.,
SOT-23A-3-TR.
j) TC54VN7702EC T713: 7. 7V Voltage
Detector,
2% Tol.,
SOT-23A-3-TR.
Data Sheets
Products supported by a preliminary Data Sheet may have an errata sheet describing minor operational differences and
recommended workarounds. To determine if an errata sheet exists for a particular device, please contact one of the following:
1. Your local Microchip sales office
2. The Microchip Corporate Literature Center U.S. FAX: (480) 792-7277
3. The Microchip Worldwide Site (www.microchip.com)
Please specify which device, revision of silicon and Dat a Sheet (include Literature #) you are using.
Customer Notification System
Register on our web site (www.microchip. com /cn) to receive the most current information on our products.
TC54
DS21434G-page 14 2004 Microchip Technology Inc.
NOTES:
2004 Microchip Technology Inc. DS21434G-page 15
Information contained in this publication regarding device
applications and the like is intended through sug gestion only
and may be superseded by updates. It is your responsibility to
ensure that your application meets with your specifications.
No representation or warranty is given and no liability is
assumed by Microc hip Technology Inco rporated with respect
to the accuracy or use of such inf orm ation, or inf ringement of
patents or other intellectual property rights arising from such
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components in life support systems is not authorized except
with express written approval by Microchip. No licenses are
conveyed, implicitly or otherwise, under any intellectual
property rights.
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The Microchip name and logo, the Microchip logo, Accuron,
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PICSTART, PRO MATE, Po w erSmart , rfP IC, and
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dsPICDEM.net, dsPICworks, ECAN, ECONOMONITOR,
FanSense, FlexROM, fuzzy LAB, In-Circ uit Serial
Programm ing, ICSP, ICEPIC, Migra table Memory, MPASM,
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SQTP is a service mark of Microchip Technology Incorporated
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All other trademarks mentioned herein are property of their
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© 2004, Microchip Technology Incorporat ed, Printed in the
U.S.A., All Rights Reserved.
Printed on recycled paper.
Note the following details of the code protection feature on Microchip devices:
• Microchip products meet the specification contained in their particular Microchip Data Sheet.
• Microchip believes that it s family of products is one of the most secure families of its kind on the market today, when used in t he
intended manner and under normal conditions.
• There are dishonest and possibly illegal methods used to breach the code protection feature. All of these methods, to our
knowledge, require using the Microchip products in a manner outside the operating specifications contained in Microchip’s Data
Sheets. Most likely, the person doing so is engaged in theft of intellectual property.
• Microchip is willing to work with the customer who is concerned about the integrity of their code.
• Neither Microchip nor any other semiconductor manufacturer can guarantee the security of their code. Code protection does not
mean that we are guaranteeing the product as “unbreakable.”
Code protection is constantly evolving. We a t Microc hip are committed to continuously improving the code protection features of our
products. Attempts to break Microchip’ s code protection f eature may be a violati on of the Digital Millennium Copyright Act. If such act s
allow unauthorized access to your software or other copyrighted work, you may have a right to sue for relief under that Act.
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DS21434G-page 16 2004 Microchip Technology Inc.
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Fax: 86-591-750-3521
China - Hong Kong SAR
Te l: 852-2401-1200
Fax: 852-2401-3431
China - Shanghai
Te l: 86-21-6275-5700
Fax: 86-21-6275-5060
China - Shenzhen
Tel: 86-755-8290- 1380
Fax: 86-755-8295-1393
China - Shunde
Tel: 86-757-2839-5507
Fax: 86-757-2839-5571
China - Qingdao
Te l: 86-532-502-7355
Fax: 86-532-502-7205
ASIA/PACIFIC
India - Bangalore
Tel: 91-80-2229-0061
Fax: 91-80-2229-0062
India - New Delhi
Tel: 91-11-5160-8632
Fax: 91-11-5160-8632
Japan - Kanagawa
Tel: 81-45-471- 6166
Fax: 81-45-471-6122
Korea - Seoul
Tel: 82-2-554-7200
Fax: 82-2-558-5932 or
82-2-558-5934
Singapore
Tel: 65-6334-8870
Fax: 65-6334-8850
Taiwan - Kaohsiung
Tel: 886-7-536-4816
Fax: 886-7-536-4817
Taiwan - Taipei
Tel: 886-2-2500-6610
Fax: 886-2-2508-0102
Taiwan - Hsinchu
Tel: 886-3-572-9526
Fax: 886-3-572-6459
EUROPE
Austria - Weis
Tel: 43-7242-2244- 399
Fax: 43-7242-2244-393
Denmark - Ballerup
Tel: 45-4420-9895
Fax: 45-4420-9910
France - Massy
Tel: 33-1-69-53-63-20
Fax: 33-1-69-30-90-79
Germany - Ismaning
Te l: 49-89-627-144-0
Fax: 49-89-627-14 4-44
Italy - Milan
Tel: 39-0331-742611
Fax: 39-0331-466781
Netherlands - Drunen
Tel: 31-416-690399
Fax: 31-416-690340
England - Berkshire
Tel: 44-118-921-5869
Fax: 44-118-921- 5820
WORLDWIDE SALES AND SERVICE
08/24/04
