ETC 19766

TM
AMD-K5™
PROCESSOR
Support for the AMD-K5
Dual Voltage Processor
Application Note
Publication # 19766
Rev: C
Issue Date: September 1996
Amendment/0
This document contains information on a product under development at Advanced Micro
Devices (AMD). The information is intended to help you evaluate this product. AMD reserves the right to change or discontinue work on this proposed product without notice.
© 1996 Advanced Micro Devices, Inc. All rights reserved.
Advanced Micro Devices reserves the right to make changes in its products
without notice in order to improve design or performance characteristics.
This publication neither states nor implies any representations or warranties
of any kind, including but not limited to any implied warranty of merchantability or fitness for a particular purpose.
AMD makes no representations or warranties with respect to the accuracy or
completeness of the contents of this publication or the information contained
herein, and reserves the right to make changes at any time, without notice.
AMD disclaims responsibility for any consequences resulting from the use of
the information included herein.
Trademarks
AMD, the AMD logo, and combinations thereof are trademarks of Advanced Micro Devices, Inc.
AMD-K5 is a trademark of Advanced Micro Devices, Inc.
Other product names used in this publication are for identification purposes only and may be trademarks of their
respective companies.
19766C/0—Sep1996
Support for the AMD-K5 Dual Voltage Processor
Contents
Background . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Dual Voltage Processor Power Supply Specification . . . . . . . . . . . . . 3
Voltage Planes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Current Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Dual Voltage Power Supply Circuits. . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Low Cost Dual Voltage Power Supply Circuit . . . . . . . . . . . . . . . . . . . 6
Precision Dual Voltage Power Supply Circuit . . . . . . . . . . . . . . . . . . . 8
Printed Circuit Layout Recommendations . . . . . . . . . . . . . . . . . . . . . 10
Component Notes and Noise Reduction . . . . . . . . . . . . . . . . . . . . . . . 11
Linear Regulator Integrated Circuits . . . . . . . . . . . . . . . . . . . . . . . . . 11
Power Supply Decoupling Capacitors . . . . . . . . . . . . . . . . . . . . . . . . . 11
Processor Decoupling Capacitance . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Component Layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Split Voltage Plane . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Additional Information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Contents
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Contents
Support for the AMD-K5 Dual Voltage Processor
19766C/0—Sep1996
List of Tables
Table 1.
Table 2.
Table 3.
Table 4.
Table 5.
Core Voltage Requirements . . . . . . . . . . . . . . . . . . . . . . . . 5
Jumper Settings for the Low Cost and Precision
Dual Voltage Power Supply Circuits . . . . . . . . . . . . . . . . . 6
Bill of Materials for the Low Cost Dual Voltage
Power Supply Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Bill of Materials for Precision Dual Voltage
Power Supply Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Additional Information for AMD-K5 Dual
Voltage Processors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
List of Figures
Figure 1.
Figure 2.
Figure 3.
Figure 4.
Figure 5.
Figure 6.
Package Marking for the AMD-K5 Processor (Model 0) . 2
Package Marking for the AMD-K5 Processor (Model 1) . 2
Location of Vcc and Ground Pins in the SPGA Package . 4
Low Cost Dual Voltage Power Supply Circuit. . . . . . . . . . 7
Precision Dual Voltage Power Supply Circuit . . . . . . . . . 9
Suggested Component Placement for the
Low Cost Dual Voltage Circuit . . . . . . . . . . . . . . . . . . . . . 13
Figure 7. Suggested Component Placement for the
Precision Dual Voltage Circuit . . . . . . . . . . . . . . . . . . . . . 14
List of Tables and Figures
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List of Tables and Figures
19766C/0—Sep1996
Support for the AMD-K5 Dual Voltage Processor
Support for the AMD-K5™
Dual Voltage Processor
AMD-K5™ processors, manufactured with AMD’s enhanced
0.35-µm process (CS34E), require a lower supply voltage for
the core, separate from that used to power the I/O pins
(3.38 V or 3.52 V). Dual voltage processors can be identified by
an H, J, or K in the operating voltage suffix of the ordering
part number (OPN). See Figure 1 for more details.
This application note describes two dual voltage regulator circuits that can be used to generate a 3.38-V or 3.52-V I/O voltage
supply and a selectable core supply voltage (2.50 V, 2.70 V,
2.93 V, 3.38 V, or 3.52 V) from a standard personal computer
power supply. In addition, specific recommendations are given
for decoupling capacitor selection and placement to achieve
optimal noise reduction levels.
Background
As digital integrated circuit manufacturing processes advance,
finer geometries require lower supply voltages to operate
properly. Processors manufactured with the CS34E process
will use a reduced voltage between 2.50 V and 2.93 V to power
the core circuitry of the processor. Specially designed circuits
for the I/O buffers will operate with a separate voltage supply
of 3.38 V or 3.52 V to accommodate standard logic and memory
devices connected to the bus.
Background
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19766C/0—Sep1996
AMD has developed two linear dual voltage regulator circuits,
each of which can be used to generate a 3.38-V or 3.52-V supply
for the I/O and a core voltage supply of 2.50 V, 2.70 V, or
2.93 V, selectable via jumpers on the motherboard. These circuits also support single voltage versions of the AMD-K5
processor.
A basic issue in power supply circuit design is noise reduction.
Excessive noise levels can impair proper operation and contribute to possible EMI and RFI radiation. This application
note provides some basic guidelines for reducing noise generated by fast transients of voltage and current wave forms.
Product
Name
Package Type:
A = SPGA
P-Rating
Processor
Core
OPN
!-$+TM
PR100
AMD-K5-PR100ABQ
100 MHz
E <DATECODE>
m c 1996 AMD
HEATSINK AND FAN
Operating Voltage:
B = 3.45 V–3.60 V (3.52 V Nominal)
H = 2.86 V–3.0 V Core/3.135 V–3.465 V I/O
(2.93 V Nominal Core/3.30 V Nominal I/O
Case Temperature:
Q = 60°C
R = 70°C
Internal CPU
Frequency
Figure 1. Package Marking for the AMD-K5 Processor (Model 0)
Product
Name
Package Type:
A = SPGA
P-Rating
Processor
Core
OPN
!-$+TM
PR133
AMD-K5-PR133ABQ
B <DATECODE>
m c 1996 AMD
Operating Voltage:
B = 3.45 V–3.60 V (3.52 V Nominal)
H = 2.86 V–3.0 V Core/3.135 V–3.465 V I/O
(2.93 V Nominal Core/3.30 V Nominal I/O
66 MHz Bus 3.52 V
Bus Frequency
Nominal Voltage
HEATSINK AND FAN
Case Temperature:
Q = 60°C
R = 70°C
Figure 2. Package Marking for the AMD-K5 Processor (Model 1)
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Dual Voltage Processor Power Supply Specification
Voltage Planes
The AMD-K5 dual voltage processor has internal voltage
planes for core and I/O. The power supply Vcc pin assignments
for the AMD-K5 processor are as follows:
VCC2
(Core):
A-07, A-09, A-11, A-13, A-15, A-17, G-01, J-01, L-01,
N-01, Q-01, S-01, U-01, W-01, Y-01, AA-01, AC-01,
AE-01, AG-01, AN-09, AN-11, AN-13, AN-15, AN-17,
AN-19
VCC3
(I/O):
A-19, A-21, A-23, A-25, A-27, A-29, E-37, G-37, J-37,
L-33, L-37, N-37, Q-37, S-37, T-34, U-33, U-37, W-37,
Y-37, AA-37, AC-37, AE-37, AG-37, AN-21, AN-23,
AN-25, AN-27, AN-29
INC:
AN-01, AN-03
Notes:
1) Some motherboards connect a 5 V supply to pins AN-01 and
AN-03. This connection is not required for the AMD-K5 processor and these pins are internally not connected (INC).
2) The voltage select pin (VCC2DET) active Low is located at
AL-01.
Figure 3 shows the location of the separate Vcc and ground
pins on the SPGA package.
Dual Voltage Processor Power Supply Specification
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VCC2 pins (core)
VCC3 pins (I/O)
Other
VSS pins
INC pins (see Note on page 3)
VCC2DET pin
Figure 3. Location of Vcc and Ground Pins in the SPGA Package
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Current Requirements
The AMD-K5 dual voltage processor has the following maximum current requirements (rated at maximum Tcase and maximum Vcc2 and Vcc3):
Maximum Icc core of 27 mA / MHz
■
Maximum Icc I/O of 16 mA / MHz
Note: This information is preliminary and subject to change. See
the AMD-K5™ Processor Data Sheet (order# 18522) for the
latest information.
■
The core voltage requirements are shown in Table 1. The table
identifies the dual voltage processors by their operating voltage suffixes H (2.93 V), J (2.70 V), and K (2.50 V). See Figure 1
for more information.
Table 1.
Core Voltage Requirements
Core Vcc (OPN Suffix)
Minimum
Center
Maximum
H
2.860 V
2.930 V
3.000 V
J
2.565 V
2.700 V
2.835 V
K
2.375 V
2.500 V
2.625 V
Dual Voltage Power Supply Circuits
Two dual voltage supply circuits have been developed for use
with the AMD-K5 processor. Both designs support single and
dual voltage versions of the AMD-K5 processor. The designs
are as follows:
■
■
Low Cost Dual Voltage Power Supply Circuit
This circuit meets all the current and voltage requirements
for the AMD-K5 processor while minimizing costs. See “Low
Cost Dual Voltage Power Supply Circuit” on page 6 for
more information.
Precision Dual Voltage Power Supply Circuit
This circuit uses five-terminal, high-precision regulators
that provide tighter regulation and improved design margin
for more demanding applications. See “Precision Dual Voltage Power Supply Circuit” on page 8 for more information.
Dual Voltage Power Supply Circuits
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Low Cost Dual Voltage Power Supply Circuit
The circuit diagram for the low cost dual voltage power supply
is shown in Figure 4. Regulator U1 provides a 3.38 V or 3.52 V
supply to the processor I/O. Jumper J4 selects the voltage level
to power the I/O circuitry. When J4 is installed, Vcc3 will be
3.38 V ± 2%. When J4 is not installed, Vcc3 will be 3.53 V ± 2%.
Regulator U2 provides a variable supply of 2.50 V, 2.70 V, or
2.93 V to the processor core. The supply voltage is selectable
via jumpers J3, J2, and J1, respectively.
Jumpers J5 through J8 should be installed when using single
voltage versions of the AMD-K5 processor. The jumpers connect the output of regulator U1 (I/O voltage) to the output of
regulator U2 (core voltage), providing a common voltage
(3.38 V or 3.52 V) to both the I/O and core of the processor.
Regulator U2 senses the presence of a higher voltage on its
output pin and safely shuts off its output circuitry. This is an
acceptable configuration and does not harm either regulator.
Using example OPNs, Table 2 shows the appropriate jumper
settings for each voltage option.
Table 2.
Jumper Settings for the Low Cost and Precision Dual Voltage Power Supply Circuits
Jumpers Installed
Example OPN
Vcc2
(Core)
Vcc3
(I/O)
J1
J2
J3
J4
J5 – J8
AMD-K5-PR90AHQ
2.93 V
3.38 V
X
—
—
X
—
AMD-K5-PR90AJQ
2.70 V
3.38 V
—
X
—
X
—
AMD-K5-PR90AKQ
2.50 V
3.38 V
—
—
X
X
—
AMD-K5-PR90ACQ1
3.38 V
3.38 V
—
—
—
X
X
AMD-K5-PR90ABQ1
3.53 V
3.53 V
—
—
—
—
X
Notes:
1. Single-voltage mode only.
X Installed
— Not installed
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Figure 4. Low Cost Dual Voltage Power Supply Circuit
Note: Jumper J1 is shorted by a trace and is therefore not required.
The J1 jumper header, if installed, can serve as a resting
spot for a jumper when it is not installed at the J2 or J3
header.
Low Cost Dual Voltage Power Supply Circuit
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Precision Dual Voltage Power Supply Circuit
The circuit diagram for the precision dual voltage power
supply is shown in Figure 5. Regulator U1 provides a 3.38-V or
3.53-V supply to the processor I/O, selectable via jumper J4.
Regulator U2 provides a variable supply (2.50 V, 2.70 V, or
2.93 V) to the processor core, selectable via jumpers J3, J2,
and J1. Five-terminal voltage regulators (model 1580) provide
tighter regulation, adding design margin for applications that
may experience extremes in temperature and/or AC line
regulation.
The precision circuit has the following advantages relative to
the low cost circuit:
■
■
■
■
■
Improved output voltage regulation due to the use of a 12-V
input reference voltage
Improved tolerance to changes in line, load, and
temperature
Greater ripple rejection
Lower dropout voltage
Greater maximum load current (The voltage regulators
used in the precision circuit can supply 7.0 amps of current
per regulator. The voltage regulators used in the low cost
circuit can supply 4.6 amps of current per regulator.)
See the data sheets for the voltage regulators for the latest
specifications.
Using example OPNs, Table 2 shows the appropriate jumper
settings for each voltage option.
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Figure 5. Precision Dual Voltage Power Supply Circuit
Note: Jumper J1 is shorted by a trace and is therefore not required.
The J1 jumper header, if installed, can serve as a resting
spot for a jumper when it is not installed at the J2 or J3
header.
Precision Dual Voltage Power Supply Circuit
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Printed Circuit Layout Recommendations
Printed circuit layout recommendations for the AMD-K5 processor dual voltage power supply circuit include the following:
1. Use a multiple-plane motherboard. The preferred sequencing of signal, power, and ground planes (assuming a
six-layer printed circuit board) are as follows:
Layer 1:
Layer 2:
Layer 3:
Layer 4:
Layer 5:
Layer 6:
Signal 1
Ground
Signal 2
Signal 3
Power
Signal 4
2. Some of the processor data bus I/O pins are located within
the suggested core Vcc plane area (see Figures 6 and 7).
Traces for these pins should be restricted to signal layers 1,
2, and 3 (avoid signal 4) to ensure a low-impedance path for
return currents.
3. Use 0.01 µF MLC capacitors (e.g., AVX 0805YA103MAT2A)
to connect the I/O Vcc plane with the core Vcc plane, locating these capacitors near any trace with fast edge rate signals. These capacitors provide a low-impedance return path
for high-frequency currents.
4. Use multiple vias when connecting voltage regulators and
large capacitors (greater than 200 µF) to power and ground
planes.
5. Use minimum copper lead lengths, wherever possible, to
reduce inductance and resistance.
6. Use correct component orientation, wherever possible, to
minimize lead lengths.
7. Where possible, use a top-level trace to connect decoupling
capacitors to the processor’s Vcc and ground pins.
8. When printed circuit layout permits, some bypass capacitors should be located on the outside edge of the processor
socket. These capacitors should be positioned to permit
direct top-side routing to the processor Vcc and ground pins.
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Component Notes and Noise Reduction
Linear Regulator Integrated Circuits
The linear three-terminal voltage regulators, U1 and U2, both
require input decoupling capacitors and output bulk decoupling tantalum capacitors with low ESR values (e.g., less than
100 mΩ). Heat sinks for the TO220 packages required for both
linear regulator circuits are dependent on mechanical size
restrictions of the design and the ambient air temperature
specification inside the personal computer enclosure. Both
linear regulators should have low dropout voltages (approximately one volt) required when the input voltage is 5 V
(± 5%).
Power Supply Decoupling Capacitors
The input capacitors C1, C2, and C3 function as decoupling
capacitors for the 5 V input power from the personal computer
power supply. C5 and C6 provide bulk capacitance at low ESR
(equivalent series resistance) and ESL (equivalent series
inductance). C8 to C38 keep the ESR and ESL Low at high frequencies (greater than 100 kHz) because of the multiple parallel current paths. Surface mounted capacitors with large lead
widths are recommended to reduce lead inductance and resistance.
The output capacitors are required by the linear regulator circuits to minimize ringing during damping periods and to supply transient current requirements during processor clock
edges when maximum peak current occurs. Surface mounted
capacitors are recommended to reduce lead lengths.
Processor Decoupling Capacitance
The processor decoupling capacitors (C8 to C42) should be
located as close to the processor Vcc ground pins as possible. It
is recommended that surface mounted capacitors be used to
minimize resistance and inductance in the lead lengths. When
possible, use traces to connect capacitors directly to the processor’s Vcc and ground pins.
Component Notes and Noise Reduction
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Component Layout
A suggested component placement for the low cost dual voltage power supply circuit is shown in Figure 6. Table 3 is a bill
of materials for the low cost circuit. A suggested component
placement for the precision dual voltage power supply circuit
is shown in Figure 7. Table 4 is a bill of materials for the precision circuit.
Split Voltage Plane
AMD recommends using a split voltage plane to supply separate voltages to the I/O and core of the processor. This
approach helps reduce noise levels without requiring the need
for additional printed circuit board layers. Figures 6 and 7
show examples of suggested component placement for the two
circuits. The solid line on each figure represents the approximate location for separation of the voltage power planes. Components have been placed in accordance with their associated
voltage plane. Jumpers J5 through J8 straddle the planes and
connect the planes together when installed. An isolation region
(2 mm minimum is recommended) should separate the two
voltage planes.
Note: The ground plane should never be split; it provides a low
impedance current sink and reference.
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Isolation region
(2 mm recommended)
Figure 6. Suggested Component Placement for the Low Cost Dual Voltage Circuit
Component Notes and Noise Reduction
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Isolation region
(2 mm recommended)
Figure 7. Suggested Component Placement for the Precision Dual Voltage Circuit
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Table 3.
Bill of Materials for the Low Cost Dual Voltage Power Supply Circuit
Item
Qty.
Reference
No.
Value
Footprint
1
1
R1
110 Ω, 1%,
1/8 Watt
0805
Resistor, surface mount
2
1
R2
12.4 Ω, 1%,
1/8 Watt
0805
Resistor, surface mount
3
1
R3
187 Ω, 1%,
1/8 Watt
0805
Resistor, surface mount
4
1
R4
107 Ω, 1%,
1/8 Watt
0805
Resistor, surface mount
5
1
R5
143 Ω, 1%,
1/8 Watt
0805
Resistor, surface mount
6
1
R6
931 Ω, 1%,
1/8 Watt
0805
Resistor, surface mount
7
1
R7
432 Ω, 1%,
1/8 Watt
0805
Resistor, surface mount
8
9
C1, C2, C3, C5, 330 µF, 6.3 V,
C6, C39–C42
20%
AVX
Size E
Capacitor, surface mount, tantalum, AVX part no.
TPSE337M063100 or equivalent
9
2
C4, C7
0.33 µF, 16 V,
20%
0805
Capacitor, surface mount, ceramic, AVX (Y5V Dielectric)
part no. 012063G334ZAT2A or equivalent
10
31
C8–C22 and
C23–C38
0.1 µF
0805
Capacitor, surface mount, ceramic, AVX (X7R Dielectric)
part no. 0805YC104MAT2A or equivalent
11
2
U1, U2
LT1585 or
EZ1585
TO220
Linear regulator, 3 terminal (5 amp) (Linear Technology
or Semtech)
Description
12
1
HS
Heat Sink
Heat Sink
Heat sink can be thermally connected to both U1 and
U2, but is electrically isolated via mica insulators or
Thermalloy TO220 heat sink (size depends on printed
circuit layout and ambient temperature specification for
personal computer) (e.g., Thermalloy 7020B-MT)
13
8
J1–J8
Berg Header
2 Pin TH
Headers, 2 pin, through hole, 0.1 in spacing
Component Notes and Noise Reduction
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Support for the AMD-K5 Dual Voltage Processor
Table 4.
19766C/0—Sep1996
Bill of Materials for Precision Dual Voltage Power Supply Circuit
Item
Qty.
Reference
No.
Value
Footprint
1
1
R1
110 kΩ, 1%,
1/8 Watt
0805
Resistor, surface mount
2
1
R2
12.4 Ω, 1%,
1/8 Watt
0805
Resistor, surface mount
3
1
R3
187 Ω, 1%,
1/8 Watt
0805
Resistor, surface mount
4
1
R4
107 Ω, 1%,
1/8 Watt
0805
Resistor, surface mount
5
1
R5
143 Ω, 1%,
1/8 Watt
0805
Resistor, surface mount
6
1
R6
931 Ω, 1%,
1/8 Watt
0805
Resistor, surface mount
7
1
R7
432 Ω, 1%,
1/8 Watt
0805
Resistor, surface mount
8
1
R8, R9
2 Ω, 5%,
1/8 Watt
0805
Resistor, surface mount
9
9
10
2
C4, C7
0.33 µF, 16 V,
20%
0805
Capacitor, surface mount, ceramic, AVX (Y5V Dielectric)
part no. 012063G334ZAT2A or equivalent
11
31
C8–C22 and
C23–C38
0.1 µF
0805
Capacitor, surface mount, ceramic, AVX (X7R Dielectric)
part no. 0805YC104MAT2A or equivalent
12
2
C43, C44
1 µF, 16 V
20%
1210
Capacitor, surface mount, ceramic, AVX (Y5V Dielectric)
part no. 012063G105ZAT2A or equivalent
13
1
C45
33 µF, 20 V
AVX Size D
14
2
U1, U2
LT1580 or
EZ1580
TO220
16
C1, C2, C3, C5, 330 µF, 6.3 V,
C6, C39–C42
20%
AVX Size E
Description
Capacitor, surface mount, tantalum, AVX part no.
TPSE337M063100 or equivalent
Capacitor, surface mount, tantalum, AVX part no.
TPSD336M020R0200 or equivalent
Linear regulator, 5 terminal (7 amp) (Linear Technology or Semtech)
15
1
HS
Heat Sink
Heat Sink
Heat sink can be thermally connected to both U1 and
U2, but is electrically isolated via mica insulators or
Thermalloy TO220 heat sink (size depends on printed
circuit layout and ambient temperature specification for
personal computer) (e.g., Thermalloy 7020B-MT)
16
8
J1–J8
Berg Header
2 Pin TH
Headers, 2 pin, through hole, 0.1 in spacing
Support for the AMD-K5™ Dual Voltage Processor
19766C/0—Sep1996
Additional Information
The following third-party application notes provide information about products designed to accommodate AMD-K5 dual
voltage processors.
Table 5.
Additional Information for AMD-K5 Dual Voltage Processors
Title
Power Solutions for the
AMD-K5™ Microprocessor
Order Number
AN96-1
Available From:
Semtech Corporation
652 Mitchell Road
Newbury Park, CA 91320
Attention: Andrew Stewart
Tel: 805-498-2111
Fax: 805-498-3804
Power Solutions for the AMD-K5™
Processors
Application Note 133
Linear Technology Corporation
1630 McCarthy Blvd.
Milpitas, CA 95035-7487
Attention: Craig Varga
Tel: 408-432-1900
Fax: 408-434-0507
Additional Information
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Support for the AMD-K5™ Dual Voltage Processor