MICROCHIP TC7660IJA

EVALUATION
KIT
AVAILABLE
TC7660
CHARGE PUMP DC-TO-DC VOLTAGE CONVERTER
GENERAL DESCRIPTION
FEATURES
■
■
■
■
■
■
■
■
■
■
Converts +5V Logic Supply to ±5V System
Wide Input Voltage Range .................... 1.5V to 10V
Efficient Voltage Conversion ......................... 99.9%
Excellent Power Efficiency ............................... 98%
Low Power Supply ............................... 80µA @ 5VIN
Low Cost and Easy to Use
— Only Two External Capacitors Required
RS232 Negative Power Supply
Available in Small Outline (SO) Package
Improved ESD Protection ....................... Up to 3kV
No Dx Diode Required for High Voltage Operation
The TC7660 is a pin-compatible replacement for the
Industry standard TC7660 charge pump voltage converter.
It converts a +1.5V to +10V input to a corresponding – 1.5V
to -10V output using only two low-cost capacitors, eliminating inductors and their associated cost, size and EMI.
The on-board oscillator operates at a nominal frequency of 10kHz. Operation below 10kHz (for lower supply
current applications) is possible by connecting an external
capacitor from OSC to ground (with pin 1 open).
The TC7660 is available in both 8-pin DIP and 8-pin
SOIC packages in commercial and extended temperature
ranges.
ORDERING INFORMATION
PIN CONFIGURATION (DIP and SOIC)
NC
1
CAP + 2
GND
8 V+
NC
1
8 V+
7 OSC
CAP +
2
7 OSC
GND
3
3 TC7660CPA 6 LOW
VOLTAGE (LV)
TC7660EPA
CAP – 4 TC7660IJA 5 VOUT
CAP –
TC7660COA 6 LOW
VOLTAGE (LV)
TC7660CPA
5 VOUT
4
NC = NO INTERNAL CONNECTION
Temperature
Range
Part No.
Package
TC7660COA
8-Pin SOIC
0°C to +70°C
TC7660CPA
8-Pin Plastic DIP
TC7660EOA
8-Pin SOIC
– 40°C to +85°C
0°C to +70°C
TC7660EPA
8-Pin Plastic DIP
– 40°C to +85°C
TC7660IJA
8-Pin CerDIP
– 40°C to +85°C
TC7660MJA
8-Pin CerDIP
– 55°C to +125°C
TC7660EV
Evaluation Kit for
Charge Pump Family
FUNCTIONAL BLOCK DIAGRAM
V + CAP +
8
OSC
LV
7
RC
OSCILLATOR
÷2
2
VOLTAGE–
LEVEL
TRANSLATOR
4
CAP –
6
5
VOUT
INTERNAL
VOLTAGE
REGULATOR
LOGIC
NETWORK
TC7660
3
GND
© 2001 Microchip Technology Inc.
DS21465A
TC7660-7 9/30/96
CHARGE PUMP DC-TO-DC
VOLTAGE CONVERTER
TC7660
Operating Temperature Range
C Suffix .................................................. 0°C to +70°C
I Suffix ............................................... – 25°C to +85°C
E Suffix ............................................. – 40°C to +85°C
M Suffix ........................................... – 55°C to +125°C
Storage Temperature Range ................ – 65°C to +150°C
Lead Temperature (Soldering, 10 sec) ................. +300°C
ABSOLUTE MAXIMUM RATINGS*
Supply Voltage ...................................................... +10.5V
LV and OSC Inputs
Voltage (Note 1) .......................... – 0.3V to (V++0.3V)
for V+ < 5.5V
+
(V – 5.5V) to (V++0.3V)
for V+ > 5.5V
Current Into LV (Note 1) ..................... 20 µA for V+ > 3.5V
Output Short Duration (VSUPPLY ≤ 5.5V) ........ Continuous
Power Dissipation (TA ≤ 70°C) (Note 2)
CerDIP ............................................................800mW
Plastic DIP ...................................................... 730mW
SOIC ............................................................... 470mW
*Static-sensitive device. Unused devices must be stored in conductive
material. Protect devices from static discharge and static fields. Stresses
above 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 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.
ELECTRICAL CHARACTERISTICS: Specifications Measured Over Operating Temperature Range With,
V+ = 5V, COSC = 0, Test Circuit (Figure 1), unless otherwise indicated.
Symbol
Parameter
I+
V+H
Supply Current
Supply Voltage Range, High
V+L
Supply Voltage Range, Low
ROUT
Output Source Resistance
FOSC
PEFF
VOUT EFF
ZOSC
Oscillator Frequency
Power Efficiency
Voltage Conversion Efficiency
Oscillator Impedance
Test Conditions
RL = ∞
Min ≤ TA ≤ Max,
RL = 10 kΩ, LV Open
Min ≤ TA ≤ Max,
RL = 10 kΩ, LV to GND
IOUT = 20mA, TA = 25°C
IOUT = 20mA, 0°C ≤ TA ≤ +70°C
(C Device)
IOUT = 20mA, – 40°C ≤ TA ≤ +85°C
(I Device)
IOUT = 20mA, –55°C ≤ TA ≤ +125°C
(M Device)
V+ = 2V, IOUT = 3 mA, LV to GND
0°C ≤ TA ≤ +70°C
V+ = 2V, IOUT = 3 mA, LV to GND
– 55°C ≤ TA ≤ +125°C (Note 3)
Pin 7 open
RL = 5kΩ
RL = ∞
V+ = 2V
V+ = 5V
Min
Typ
Max
Unit
—
3
80
—
180
10
µA
V
1.5
—
3.5
V
—
—
70
—
100
120
Ω
Ω
—
—
130
Ω
—
104
150
Ω
—
150
300
Ω
—
160
600
Ω
—
95
97
—
—
10
98
99.9
1
100
—
—
—
—
—
kHz
%
%
MΩ
kΩ
NOTES: 1. Connecting any input terminal to voltages greater than V+ or less than GND may cause destructive latch-up. It is recommended that no
inputs from sources operating from external supplies be applied prior to "power up" of the TC7660.
2. Derate linearly above 50°C by 5.5 mW/°C.
3. TC7660M only.
4. The TC7660 can be operated without the Dx diode over full temperature and voltage range.
TC7660-7 9/30/96
2
© 2001 Microchip Technology Inc.
DS21465A
CHARGE PUMP DC-TO-DC
VOLTAGE CONVERTER
TC7660
TYPICAL PERFORMANCE CHARACTERISTICS (Circuit of Figure 1)
Power Conversion Eff. vs. Osc. Freq.
100
POWER CONVERSION EFFICIENCY (%)
Operating Voltage vs. Temperature
12
SUPPLY VOLTAGE (V)
10
8
6
SUPPLY VOLTAGE RANGE
4
2
0
–55
–25
0
+25 +50 +75 +100 +125
TEMPERATURE (°C)
Output Source Resistance vs. Supply Voltage
1k
100Ω
10Ω
1
2
3
4
5
6
SUPPLY VOLTAGE (V)
7
92
90
88
86
84
82
OSCILLATOR FREQUENCY (kHz)
1k
100
DS21465A
1k
OSCILLATOR FREQUENCY (Hz)
10k
IOUT = 1 mA
450
400
200
150
V + = +2V
100
V + = +5V
50
–25
0
+25 +50 +75 +100 +125
TEMPERATURE (°C)
V+ = +5V
18
16
14
12
10
8
6
–55
10
© 2001 Microchip Technology Inc.
TA = +25°C
V+ = +5V
80
100
20
TA = +25°C
V+ = +5V
10
100
1000
OSCILLATOR CAPACITANCE (pF)
IOUT = 15 mA
Unloaded Osc. Freq. vs. Temperature
10k
OSCILLATOR FREQUENCY (Hz)
94
0
–55
8
Freq. of Osc. vs. Ext. Osc. Capacitance
1
IOUT = 1 mA
500
TA = +25°C
0
96
Output Source Resistance vs. Temperature
OUTPUT SOURCE RESISTANCE (Ω)
OUTPUT SOURCE RESISTANCE (Ω)
10k
98
10k
3
–25
0
+25 +50 +75 +100 +125
TEMPERATURE (°C)
TC7660-7 9/30/96
CHARGE PUMP DC-TO-DC
VOLTAGE CONVERTER
TC7660
TYPICAL CHARACTERISTICS (Cont.)
Output Voltage vs. Load Current
5
–1
4
–2
3
OUTPUT VOLTAGE (V)
OUTPUT VOLTAGE (V)
Output Voltage vs. Output Current
0
–3
–4
–5
–6
–7
–8
TA = +25°C
LV OPEN
–9
TA = +25°C
V+ = +5V
2
1
0
–1
–2
–3
SLOPE 55Ω
–4
–10
–5
0
10
20 30 40 50 60 70 80 90 100
OUTPUT CURRENT (mA)
0
10
20 30 40 50 60 70
LOAD CURRENT (mA)
80
90
18
80
16
70
14
60
12
50
10
40
8
30
6
20
4
10
2
0
1.5
3.0
4.5
6.0
7.5
LOAD CURRENT (mA)
0
9.0
100
100
90
90
80
80
70
70
60
60
50
50
40
40
30
30
20
20
TA = +25°C
V+ = +5V
10
10
SUPPLY CURRENT (mA) (Note)
20
TA = +25°C
V+ = 2V
POWER CONVERSION EFFICIENCY (%)
100
SUPPLY CURRENT (mA) (Note)
POWER CONVERSION EFFICIENCY (%)
Supply Current and Power Conversion Efficiency vs. Load Current
0
0
10
20
30
40
50
LOAD CURRENT (mA)
60
Output Voltage vs. Load Current
2
OUTPUT VOLTAGE (V)
TA = +25°C
V+ = +2V
1
0
–1
SLOPE 150Ω
–2
0
TC7660-7 9/30/96
1
2
3
4
5
6
LOAD CURRENT (mA)
7
8
4
© 2001 Microchip Technology Inc.
DS21465A
CHARGE PUMP DC-TO-DC
VOLTAGE CONVERTER
TC7660
The four switches in Figure 2 are MOS power switches;
S1 is a P-channel device, and S2, S3 and S4 are N-channel
devices. The main difficulty with this approach is that in
integrating the switches, the substrates of S3 and S4 must
always remain reverse-biased with respect to their sources,
but not so much as to degrade their ON resistances. In
addition, at circuit start-up, and under output short circuit
conditions (VOUT = V+), the output voltage must be sensed
and the substrate bias adjusted accordingly. Failure to
accomplish this will result in high power losses and probable
device latch-up.
This problem is eliminated in the TC7660 by a logic
network which senses the output voltage (VOUT) together
with the level translators, and switches the substrates of S3
and S4 to the correct level to maintain necessary reverse
bias.
The voltage regulator portion of the TC7660 is an
integral part of the anti-latch-up circuitry. Its inherent voltage
drop can, however, degrade operation at low voltages. To
improve low-voltage operation, the LV pin should be
connected to GND, disabling the regulator. For supply
voltages greater than 3.5V, the LV terminal must be left
open to ensure latch-up-proof operation and prevent device
damage.
IS
C1
10µF
+
1
8
2
7
3
TC7660
4
COSC*
6
5
IL
V+
(+5V)
RL
VO
+
C2
10µF
NOTES: * For large values of COSC (>1000pF), the values
of C1 and C2 should be increased to 100µF.
Figure 1. TC7660 Test Circuit
Detailed Description
The TC7660 contains all the necessary circuitry to
implement a voltage inverter, with the exception of two
external capacitors, which may be inexpensive 10 µF polarized electrolytic capacitors. Operation is best understood by
considering Figure 2, which shows an idealized voltage
inverter. Capacitor C1 is charged to a voltage, V+, for the half
cycle when switches S1 and S3 are closed. (Note: Switches
S2 and S4 are open during this half cycle.) During the second
half cycle of operation, switches S2 and S4 are closed, with
S1 and S3 open, thereby shifting capacitor C1 negatively by
V+ volts. Charge is then transferred from C1 to C2, such that
the voltage on C2 is exactly V+, assuming ideal switches and
no load on C2.
V+
GND
S1
S2
S3
S4
Theoretical Power Efficiency
Considerations
In theory, a capacitive charge pump can approach
100% efficiency if certain conditions are met:
(1) The drive circuitry consumes minimal power.
(2) The output switches have extremely low ON
resistance and virtually no offset.
(3) The impedances of the pump and reservoir
capacitors are negligible at the pump frequency.
C2
VOUT
= – VIN
Figure 2. Idealized Charge Pump Inverter
© 2001 Microchip Technology Inc.
DS21465A
5
TC7660-7 9/30/96
CHARGE PUMP DC-TO-DC
VOLTAGE CONVERTER
TC7660
The output characteristics of the circuit in Figure 3 are
those of a nearly ideal voltage source in series with 70Ω.
Thus, for a load current of –10mA and a supply voltage of
+5V, the output voltage would be – 4.3V.
The dynamic output impedance of the TC7660 is due,
primarily, to capacitive reactance of the charge transfer
capacitor (C1). Since this capacitor is connected to the
output for only 1/2 of the cycle, the equation is:
The TC7660 approaches these conditions for negative
voltage multiplication if large values of C1 and C2 are used.
Energy is lost only in the transfer of charge between
capacitors if a change in voltage occurs. The energy lost
is defined by:
E = 1/2 C1 (V12 – V22)
V1 and V2 are the voltages on C1 during the pump and
transfer cycles. If the impedances of C1 and C2 are relatively
high at the pump frequency (refer to Figure 2), compared to
the value of RL, there will be a substantial difference in
voltages V1 and V2. Therefore, it is not only desirable to
make C2 as large as possible to eliminate output voltage
ripple, but also to employ a correspondingly large value for
C1 in order to achieve maximum efficiency of operation.
2
XC =
= 3.18Ω,
2πf C1
where f = 10kHz and C1 = 10µF.
V+
Dos and Don'ts
• Do not exceed maximum supply voltages.
C1
10µF
• Do not connect LV terminal to GND for supply voltages
greater than 3.5V.
+
V+
• Do not short circuit the output to
supply for voltages
above 5.5V for extended periods; however, transient
conditions including start-up are okay.
1
8
2
7
3
TC7660
• When using polarized capacitors in the inverting mode,
the + terminal of C1 must be connected to pin 2 of the
TC7660 and the + terminal of C2 must be connected to
GND Pin 3.
+
5
4
* NOTES:
6
VOUT*
C2
10µF
1. VOUT = –n V+ for 1.5V
V+
10V
Figure 3. Simple Negative Converter
Simple Negative Voltage Converter
Paralleling Devices
Figure 3 shows typical connections to provide a negative supply where a positive supply is available. A similar
scheme may be employed for supply voltages anywhere in
the operating range of +1.5V to +10V, keeping in mind that
pin 6 (LV) is tied to the supply negative (GND) only for supply
voltages below 3.5V.
Any number of TC7660 voltage converters may be
paralleled to reduce output resistance (Figure 4). The reservoir capacitor, C2, serves all devices, while each device
requires its own pump capacitor, C1. The resultant output
resistance would be approximately:
ROUT =
TC7660-7 9/30/96
6
ROUT (of TC7660)
n (number of devices)
© 2001 Microchip Technology Inc.
DS21465A
CHARGE PUMP DC-TO-DC
VOLTAGE CONVERTER
TC7660
V
1
8
2
C1
+
TC7660
3
4
7
1
8
6
2
7
5
"1"
C1
TC7660
3
"n"
4
RL
6
5
+
C2
Figure 4. Paralleling Devices Lowers Output Impedance
Cascading Devices
device latch-up, a 1kΩ resistor must be used in series with
the clock output. In a situation where the designer has
generated the external clock frequency using TTL logic, the
addition of a 10kΩ pull-up resistor to V+ supply is required.
Note that the pump frequency with external clocking, as with
internal clocking, will be 1/2 of the clock frequency. Output
transitions occur on the positive-going edge of the clock.
It is also possible to increase the conversion efficiency
of the TC7660 at low load levels by lowering the oscillator
frequency. This reduces the switching losses, and is achieved
by connecting an additional capacitor, COSC, as shown in
Figure 7. Lowering the oscillator frequency will cause an
undesirable increase in the impedance of the pump (C1) and
the reservoir (C2) capacitors. To overcome this, increase the
values of C1 and C2 by the same factor that the frequency
has been reduced. For example, the addition of a 100pF
capacitor between pin 7 (OSC) and pin 8 (V+) will lower the
oscillator frequency to 1kHz from its nominal frequency of
10kHz (a multiple of 10), and necessitate a corresponding
increase in the values of C1 and C2 (from 10µF to 100µF).
The TC7660 may be cascaded as shown (Figure 6) to
produce larger negative multiplication of the initial supply
voltage. However, due to the finite efficiency of each device,
the practical limit is 10 devices for light loads. The output
voltage is defined by:
VOUT = –n (VIN)
where n is an integer representing the number of devices
cascaded. The resulting output resistance would be approximately the weighted sum of the individual TC7660
ROUT values.
Changing the TC7660 Oscillator Frequency
It may be desirable in some applications (due to noise or
other considerations) to increase the oscillator frequency.
This is achieved by overdriving the oscillator from an external clock, as shown in Figure 6. In order to prevent possible
V+
1
8
2
7
+
10µF
3
TC7660
4
"1"
1
6
5
8
2
+
10µF
7
3
TC7660
6
4
"n"
5
VOUT*
+
* NOTES:
1. VOUT = –n V + for 1.5V
V+
10µF
10V
Figure 5. Increased Output Voltage by Cascading Devices
© 2001 Microchip Technology Inc.
DS21465A
7
TC7660-7 9/30/96
CHARGE PUMP DC-TO-DC
VOLTAGE CONVERTER
TC7660
1
8
2
7
Combined Negative Voltage Conversion
and Positive Supply Multiplication
V+
V+
1 kΩ
+
3
10µF
TC7660
6
5
4
Figure 9 combines the functions shown in Figures 3 and
8 to provide negative voltage conversion and positive voltage multiplication simultaneously. This approach would be,
for example, suitable for generating +9V and – 5V from an
existing +5V supply. In this instance, capacitors C1 and C3
perform the pump and reservoir functions, respectively, for
the generation of the negative voltage, while capacitors C2
and C4 are pump and reservoir, respectively, for the multiplied positive voltage. There is a penalty in this configuration
which combines both functions, however, in that the source
impedances of the generated supplies will be somewhat
higher due to the finite impedance of the common charge
pump driver at pin 2 of the device.
CMOS
GATE
VOUT
+
10µF
Figure 6. External Clocking
V
C1
+
1
8
2
7
3
TC7660
4
+
COSC
6
5
V+
VOUT
C2
+
1
8
2
7
Figure 7. Lowering Oscillator Frequency
3
Positive Voltage Multiplication
+
C1
The TC7660 may be employed to achieve positive
voltage multiplication using the circuit shown in Figure 8. In
this application, the pump inverter switches of the TC7660
are used to charge C1 to a voltage level of V+– VF (where V+
is the supply voltage and VF is the forward voltage drop of
diode D1). On the transfer cycle, the voltage on C1 plus the
supply voltage (V+) is applied through diode D2 to capacitor
C2. The voltage thus created on C2 becomes (2 V+) – (2 VF),
or twice the supply voltage minus the combined forward
voltage drops of diodes D1 and D2.
The source impedance of the output (VOUT) will depend
on the output current, but for V+ = 5V and an output current
of 10 mA, it will be approximately 60Ω.
8
2
7
3
4
TC7660
D1
6
5
C1
5
D2
+
C3
VOUT =
(2 V +) – (2 VF)
+
C4
Efficient Positive Voltage
Multiplication/Conversion
Since the switches that allow the charge pumping operation are bidirectional, the charge transfer can be performed backwards as easily as forwards. Figure 10 shows
a TC7660 transforming – 5V to +5V (or +5V to +10V, etc.).
The only problem here is that the internal clock and switchdrive section will not operate until some positive voltage has
been generated. An initial inefficient pump, as shown in
Figure 9, could be used to start this circuit up, after which it
will bypass the other (D1 and D2 in Figure 9 would never turn
on), or else the diode and resistor shown dotted in Figure 10
can be used to "force" the internal regulator on.
+
+
6
+
Figure 9. Combined Negative Converter and Positive Multiplier
VOUT =
(2 V+) – (2 VF)
D2
4
D1
C2
V+
1
TC7660
VOUT =
– (V+– VF)
C2
Figure 8. Positive Voltage Multiplier
TC7660-7 9/30/96
8
© 2001 Microchip Technology Inc.
DS21465A
CHARGE PUMP DC-TO-DC
VOLTAGE CONVERTER
TC7660
VOUT = –V–
C1
10µF
+
1
8
2
7
+
10µF
1 MΩ
TC7660
3
4
6
5
V– INPUT
Figure 10. Positive Voltage Conversion
Voltage Splitting
The same bidirectional characteristics used in Figure 10
can also be used to split a higher supply in half, as shown in
Figure 11. The combined load will be evenly shared between the two sides. Once again, a high value resistor to the
LV pin ensures start-up. Because the switches share the
load in parallel, the output impedance is much lower than in
the standard circuits, and higher currents can be drawn from
the device. By using this circuit, and then the circuit of
Figure 5, +15V can be converted (via +7.5V and –7.5V) to a
nominal – 15V, though with rather high series resistance
(~250Ω).
V
+
+
50 µF
R
L1
V
=
OUT
+
–
V –V
2
50 µF
1
8
2
7
100 kΩ
+
1 MΩ
3
–
4
R
TC7660
6
5
L2
50 µF
+
–
V
–
Figure 11. Splitting a Supply in Half
© 2001 Microchip Technology Inc.
DS21465A
9
TC7660-7 9/30/96
CHARGE PUMP DC-TO-DC
VOLTAGE CONVERTER
TC7660
PACKAGE DIMENSIONS
8-Pin CerDIP
.110 (2.79)
.090 (2.29)
PIN 1
.300 (7.62)
.230 (5.84)
.020 (0.51) MIN.
.055 (1.40) MAX.
.320 (8.13)
.290 (7.37)
.400 (10.16)
.370 (9.40)
.040 (1.02)
.020 (0.51)
.200 (5.08)
.160 (4.06)
.150 (3.81)
MIN.
.200 (5.08)
.125 (3.18)
.015 (0.38)
.008 (0.20)
3° MIN.
.400 (10.16)
.320 (8.13)
.065 (1.65) .020 (0.51)
.045 (1.14) .016 (0.41)
8-Pin Plastic DIP
PIN 1
.260 (6.60)
.240 (6.10)
.045 (1.14)
.030 (0.76)
.070 (1.78)
.040 (1.02)
.310 (7.87)
.290 (7.37)
.400 (10.16)
.348 (8.84)
.200 (5.08)
.140 (3.56)
.040 (1.02)
.020 (0.51)
.150 (3.81)
.115 (2.92)
.110 (2.79)
.090 (2.29)
.015 (0.38)
.008 (0.20)
3° MIN.
.400 (10.16)
.310 (7.87)
.022 (0.56)
.015 (0.38)
Dimensions: inches (mm)
TC7660-7 9/30/96
10
© 2001 Microchip Technology Inc.
DS21465A
CHARGE PUMP DC-TO-DC
VOLTAGE CONVERTER
TC7660
PACKAGE DIMENSIONS (CONT.)
8-Pin SOIC
.157 (3.99)
.150 (3.81)
.244 (6.20)
.228 (5.79)
.050 (1.27) TYP.
.197 (5.00)
.189 (4.80)
.069 (1.75)
.053 (1.35)
.010 (0.25)
.007 (0.18)
8° MAX.
.020 (0.51) .010 (0.25)
.013 (0.33) .004 (0.10)
.050 (1.27)
.016 (0.40)
Dimensions: inches (mm)
© 2001 Microchip Technology Inc.
DS21465A
11
TC7660-7 9/30/96
CHARGE PUMP DC-TO-DC
VOLTAGE CONVERTER
TC7660
WORLDWIDE SALES AND SERVICE
AMERICAS
New York
Corporate Office
150 Motor Parkway, Suite 202
Hauppauge, NY 11788
Tel: 631-273-5305 Fax: 631-273-5335
2355 West Chandler Blvd.
Chandler, AZ 85224-6199
Tel: 480-792-7200 Fax: 480-792-7277
Technical Support: 480-792-7627
Web Address: http://www.microchip.com
Rocky Mountain
2355 West Chandler Blvd.
Chandler, AZ 85224-6199
Tel: 480-792-7966 Fax: 480-792-7456
ASIA/PACIFIC (continued)
San Jose
Microchip Technology Inc.
2107 North First Street, Suite 590
San Jose, CA 95131
Tel: 408-436-7950 Fax: 408-436-7955
Singapore
Microchip Technology Singapore Pte Ltd.
200 Middle Road
#07-02 Prime Centre
Singapore, 188980
Tel: 65-334-8870 Fax: 65-334-8850
Taiwan
Atlanta
6285 Northam Drive, Suite 108
Mississauga, Ontario L4V 1X5, Canada
Tel: 905-673-0699 Fax: 905-673-6509
500 Sugar Mill Road, Suite 200B
Atlanta, GA 30350
Tel: 770-640-0034 Fax: 770-640-0307
Microchip Technology Taiwan
11F-3, No. 207
Tung Hua North Road
Taipei, 105, Taiwan
Tel: 886-2-2717-7175 Fax: 886-2-2545-0139
ASIA/PACIFIC
Austin
EUROPE
China - Beijing
Australia
Analog Product Sales
8303 MoPac Expressway North
Suite A-201
Austin, TX 78759
Tel: 512-345-2030 Fax: 512-345-6085
Boston
2 Lan Drive, Suite 120
Westford, MA 01886
Tel: 978-692-3848 Fax: 978-692-3821
Boston
Analog Product Sales
Unit A-8-1 Millbrook Tarry Condominium
97 Lowell Road
Concord, MA 01742
Tel: 978-371-6400 Fax: 978-371-0050
Toronto
Microchip Technology Beijing Office
Unit 915
New China Hong Kong Manhattan Bldg.
No. 6 Chaoyangmen Beidajie
Beijing, 100027, No. China
Tel: 86-10-85282100 Fax: 86-10-85282104
China - Shanghai
Microchip Technology Shanghai Office
Room 701, Bldg. B
Far East International Plaza
No. 317 Xian Xia Road
Shanghai, 200051
Tel: 86-21-6275-5700 Fax: 86-21-6275-5060
Hong Kong
333 Pierce Road, Suite 180
Itasca, IL 60143
Tel: 630-285-0071 Fax: 630-285-0075
Microchip Asia Pacific
RM 2101, Tower 2, Metroplaza
223 Hing Fong Road
Kwai Fong, N.T., Hong Kong
Tel: 852-2401-1200 Fax: 852-2401-3431
Dallas
India
4570 Westgrove Drive, Suite 160
Addison, TX 75001
Tel: 972-818-7423 Fax: 972-818-2924
Two Prestige Place, Suite 130
Miamisburg, OH 45342
Tel: 937-291-1654 Fax: 937-291-9175
Microchip Technology Inc.
India Liaison Office
Divyasree Chambers
1 Floor, Wing A (A3/A4)
No. 11, OíShaugnessey Road
Bangalore, 560 025, India
Tel: 91-80-2290061 Fax: 91-80-2290062
Detroit
Japan
Chicago
Dayton
Tri-Atria Office Building
32255 Northwestern Highway, Suite 190
Farmington Hills, MI 48334
Tel: 248-538-2250 Fax: 248-538-2260
Los Angeles
18201 Von Karman, Suite 1090
Irvine, CA 92612
Tel: 949-263-1888 Fax: 949-263-1338
Mountain View
Analog Product Sales
1300 Terra Bella Avenue
Mountain View, CA 94043-1836
Tel: 650-968-9241 Fax: 650-967-1590
Microchip Technology Intl. Inc.
Benex S-1 6F
3-18-20, Shinyokohama
Kohoku-Ku, Yokohama-shi
Kanagawa, 222-0033, Japan
Tel: 81-45-471- 6166 Fax: 81-45-471-6122
Korea
Microchip Technology Korea
168-1, Youngbo Bldg. 3 Floor
Samsung-Dong, Kangnam-Ku
Seoul, Korea
Tel: 82-2-554-7200 Fax: 82-2-558-5934
All rights reserved. © 2001 Microchip Technology Incorporated. Printed in the USA. 1/01
Microchip Technology Australia Pty Ltd
Suite 22, 41 Rawson Street
Epping 2121, NSW
Australia
Tel: 61-2-9868-6733 Fax: 61-2-9868-6755
Denmark
Microchip Technology Denmark ApS
Regus Business Centre
Lautrup hoj 1-3
Ballerup DK-2750 Denmark
Tel: 45 4420 9895 Fax: 45 4420 9910
France
Arizona Microchip Technology SARL
Parc díActivite du Moulin de Massy
43 Rue du Saule Trapu
Batiment A - ler Etage
91300 Massy, France
Tel: 33-1-69-53-63-20 Fax: 33-1-69-30-90-79
Germany
Arizona Microchip Technology GmbH
Gustav-Heinemann Ring 125
D-81739 Munich, Germany
Tel: 49-89-627-144 0 Fax: 49-89-627-144-44
Germany
Analog Product Sales
Lochhamer Strasse 13
D-82152 Martinsried, Germany
Tel: 49-89-895650-0 Fax: 49-89-895650-22
Italy
Arizona Microchip Technology SRL
Centro Direzionale Colleoni
Palazzo Taurus 1 V. Le Colleoni 1
20041 Agrate Brianza
Milan, Italy
Tel: 39-039-65791-1 Fax: 39-039-6899883
United Kingdom
Arizona Microchip Technology Ltd.
505 Eskdale Road
Winnersh Triangle
Wokingham
Berkshire, England RG41 5TU
Tel: 44 118 921 5869 Fax: 44-118 921-5820
Printed on recycled paper.
01/09/01
Information contained in this publication regarding device applications and the like is intended through suggestion 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 Microchip Technology Incorporated with respect to the accuracy or use of such information, or infringement of patents or other intellectual
property rights arising from such use or otherwise. Use of Microchipís products as critical components in life support systems is not authorized except with
express written approval by Microchip. No licenses are conveyed, implicitly or otherwise, except as maybe explicitly expressed herein, under any intellectual property rights. The Microchip logo and name are registered trademarks of Microchip Technology Inc. in the U.S.A. and other countries. All rights
reserved. All other trademarks mentioned herein are the property of their respective companies.
TC7660-7 9/30/96
12
© 2001 Microchip Technology Inc.
DS21465A