mk2771-13 Holt Integrated Circuits, Inc., mk2771-13 Datasheet

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mk2771-13

Manufacturer Part Number
mk2771-13
Description
Vcxo Set-top Clock Source
Manufacturer
Holt Integrated Circuits, Inc.
Datasheet

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Part Number
Manufacturer
Quantity
Price
Part Number:
mk2771-13S
Manufacturer:
MICROCLOCK
Quantity:
20 000
MDS 2771-13 A
Description
The MK2771-03 is a low cost, low jitter, high
performance VCXO and clock synthesizer
designed for set-top boxes. The on-chip Voltage
Controlled Crystal Oscillator accepts a 0 to 3V
input voltage to cause the output clocks to vary by
±100 ppm. Using ICS/MicroClock’s patented
VCXO and analog Phase-Locked Loop (PLL)
techniques, the device uses an inexpensive
13.5 MHz crystal input to produce multiple
output clocks including a selectable processor
clock, a selectable audio clock, a fixed 33.33 MHz
or 24.576 MHz, two low skew copies of the
27MHz, and a fixed 13.5 MHz. All clocks are
frequency locked to the 27.00MHz output (and to
each other) with zero ppm error, so any output can
be used as the VCXO output.
This chip directly replaces the MK2771-03 when a
13.5 MHz input crystal is substituted for the
14.31818 MHz used on the -03. Additionally, the
-13 adds 25 MHz to the processor clock selection,
and 24.576 MHz on the BCLK.
Block Diagram
Integrated Circuit Systems • 525 Race Street•San Jose•CA•95126•(408)295-9800tel•www.icst.com
13.5 MHz
pullable
crystal
PCS1:0
ACS1:0
BCS
VIN
X2
X1
Controlled
Oscillator
2
Voltage
2
Crystal
VDD
3
Synthesis
Circuitry
GND
Clock
1
3
VCXO and Set-Top Clock Source
• Packaged in 20 pin SOIC
• Pin for pin and functional upgrade to MK2771-03
• Ideal for systems using Oak’s MPEG decoders
• On-chip patented VCXO with pull range
• VCXO tuning voltage of 0 to 3V
• Processor frequency of 16.67 MHz, 20 MHz,
• Audio clocks of 8.192, 11.2896, and 12.288 MHz
• Zero ppm synthesis error in all clocks (all exactly
• Uses an inexpensive 13.5 MHz crystal
• 25mA output drive capability at TTL levels
• Advanced, low power, sub-micron CMOS process
• 5V operating voltage
Features
of 200ppm
25 MHz, 32 MHz, 40 MHz, or 50 MHz
track 27MHz VCXO) - patented
÷ 2
Output
Output
Output
Output
Output
Buffer
Buffer
Buffer
Buffers
Buffer
Revision 110298
2
Audio Clock
Processor Clock
33.3 MHz or
24.576 MHz
27.000 MHz
13.500 MHz
MK2771-13
Printed 11/16/00

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mk2771-13 Summary of contents

Page 1

... Uses an inexpensive 13.5 MHz crystal • 25mA output drive capability at TTL levels • Advanced, low power, sub-micron CMOS process • 5V operating voltage VDD GND 3 3 Clock Synthesis Circuitry ÷ MK2771-13 Output Processor Clock Buffer Output Audio Clock Buffer Output 33.3 MHz or Buffer 24.576 MHz 2 Output 27 ...

Page 2

... Processor Clock Select 1. Selects PCLK on pin 8. See table above. 27.00 MHz VCXO clock output. 27.00 MHz VCXO clock output. Bus Clock Select . Selects BCLK on pin 9. See table above. Audio Clock Select 0. Selects ACLK on pin 10. See table above. Audio Clock Select 1. Selects ACLK on pin 10. See table above. 2 MK2771-13 PCLK (MHz) 0 50.000 1 16.667 0 25 ...

Page 3

... VDD and GND on pins 4 and 7, 6 and 7, and 15 and 14, as close to the MK2771-13 as possible. A series termination resistor of 33 may be used for each clock output.The 13.500 MHz crystal must be connected as close to the chip as possible. The crystal should be a parallel mode, pullable, with load capacitance of 14pF ...

Page 4

... Integrated Circuit Systems • 525 Race Street•San Jose•CA•95126•(408)295-9800tel•www.icst.com VCXO and Set-Top Clock Source 45° c Marking Shipping packaging MK2771-13S tubes MK2771-13S tape and reel 4 MK2771-13 20 pin SOIC Inches Inches Millimeters Millimeters Symbol Min Max Min A 0.092 0.104 2.3368 2.6416 b 0 ...

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