DATASHEET
MK2771-16
VCXO AND SET-TOP CLOCK SOURCE
Description
Features
The MK2771-16 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 3 V input voltage to cause the output clocks to vary by
±100 ppm. Using IDT’s patented VCXO and analog
Phase-Locked Loop (PLL) techniques, the device uses an
inexpensive 13.5 MHz pullable crystal input to produce
multiple output clocks including two selectable processor
clocks, a selectable audio clock, two communications
clocks, a 13.5 MHz clock, and three 27 MHz clocks. All
clocks are frequency locked to the 27 MHz output (and to
each other) with zero ppm error, so any output can be used
as the VCXO output.
• Packaged in 28-pin QSOP
• RoHS 5 (green) or RoHS 6 (green and lead free)
compliant package
• On-chip patented VCXO with pull range of 200 ppm
• VCXO tuning voltage of 0 to 3 V
• Processor frequencies include 16.66, 20, 25, 32, 40, and
•
•
•
•
•
•
50 MHz
Audio clocks support 32 kHz, 44.1 kHz, 48 kHz, and 96
kHz sampling rates
Zero ppm synthesis error in all clocks (all exactly track 27
MHz VCXO)
Uses an inexpensive 13.5 MHz pullable crystal
Full CMOS output swings with 25 mA output drive
capability at TTL levels
Advanced, low-power, sub-micron CMOS process
5 V operating voltage with 3.3 V capable I/O
Block Diagram
VDD5
VDDIO
3
ACLK
AS2:0
3
PS1, PS0
2
CS1, CS0
2
PCLK
PLL Clock
Synthesis
Circuitry
CCLK1
CCLK2
VIN
13.5 MHz
pullable
crystal
X1
X2
Voltage
Controlled
Crystal
Oscillator
x2
PLL
3
divide
by 2
Optional crystal capacitors.
27.000 MHz
13.500 MHz
6
GND
IDT™ VCXO AND SET-TOP CLOCK SOURCE
1
MK2771-16
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MK2771-16
VCXO AND SET-TOP CLOCK SOURCE
VCXO AND SYNTHESIZER
Pin Assignment
Processor Clock Select Table (MHz)
PS1
PS0
PCLK
0
0
50
0
1
16.667
M
0
25
GND
M
1
32
23
27M
1
0
40
7
22
VDD5
1
1
20
8
21
AS2
CS1
9
20
GND
GND
10
19
GND
AS2
AS1
AS0
ACLK
GND
11
18
27M
0
0
0
8.192
PCLK
12
17
CCLK1
CCLK2
13
16
0
0
1
11.2896
PS1
ACLK
14
15
13.5M
0
1
0
12.288
0
1
1
5.6448
1
0
0
18.432
1
0
1
16.9344
1
1
0
49.152
1
1
1
21.576
PS0
1
28
AS1
X2
2
27
AS0
GND
3
26
CS0
X1
4
25
27M
VDD5
5
24
VIN
6
VDDIO
VDD5
Audio Clock Table (MHz)
28-pin QSOP
Communications Clock Table (MHz)
CS1
CS0
CCLK1
CCLK2
0
0
Low
33.333
0
1
Low
24.576
1
0
11.0592
18.432
1
1
11.0592
3.6864
0 = connect directly to ground
1 = connect directly to VDDIO
M = leave floating or unconnected
IDT™ VCXO AND SET-TOP CLOCK SOURCE
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VCXO AND SYNTHESIZER
Pin Descriptions
Pin
Number
1
Pin
Name
PS0
2
X2
3, 10, 11
4
GND
X1
5, 8, 22
6
VDD5
VIN
7
VDDIO
9
CS1
12
13
PCLK
CCLK2
14
ACLK
15
16
13.5M
PS1
17
CCLK1
18, 23, 25
19, 20, 24
21
27M
GND
AS2
26
CS0
27
AS0
28
AS1
Pin Type
Pin Description
Processor clock select 0. Selects PCLK frequency. See table
above. Internal pull-up resistor.
XO
Crystal connection. Connect to a 13.5 MHz fundamental mode
pullable crystal.
Power
Connect to ground.
XI
Crystal connection. Connect to a 13.5 MHz fundamental mode
pullable crystal.
Power
Connect to +5 V.
Input
Voltage input to VCXO. Zero to 3 V signal which controls the
frequency of the VCXO.
Power
Connect to +3.3 V or +5 V. Amplitude of inputs and outputs will
match this.
Input
Communications clock select pin 1. Selects CCLK 1 and 2 per
table above. Internal pull-up.
Output
Processor clock output. Determined by status of PS1, PS0.
Output
Communications clock output 2 determined by status of CS1,
CS0 per table above.
Output
Audio clock output. Determined by status of AS2:0 per table
above.
Output
13.5 MHz VCXO clock output.
Tri-level Input Processor Clock Select 1. Selects PCLK frequency. See table
above. Self-biased to M.
Output
Communications clock output 1 determined by status of CS1,
CS0 per table above.
Output
27 MHz VCXO clock output.
Power
Connect to ground.
Input
Audio clock select 2. Selects ACLK on pin 14. See table above.
Internal pull-up resistor.
Input
Communications clock select pin 0. Selects CCLK 1 and 2 per
table above. Internal pull-up.
Input
Audio clock select 0. Selects ACLK on pin 14. See table above.
Internal pull-up resistor.
Input
Audio clock select 1. Selects ACLK on pin 14. See table above.
Internal pull-up resistor.
IDT™ VCXO AND SET-TOP CLOCK SOURCE
Input
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MK2771-16
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VCXO AND SET-TOP CLOCK SOURCE
VCXO AND SYNTHESIZER
Absolute Maximum Ratings
Stresses above the ratings listed below can cause permanent damage to the MK2771-16. These ratings, which are
standard values for IDT commercially rated parts, are stress ratings only. Functional operation of the device at these
or any other conditions above those indicated in the operational sections of the specifications is not implied.
Exposure to absolute maximum rating conditions for extended periods can affect product reliability. Electrical
parameters are guaranteed only over the recommended operating temperature range.
Item
Rating
Supply Voltage, VDD (referenced to GND)
7V
Inputs and Clock Outputs (referenced to GND)
-0.5 V to VDD+0.5 V
Ambient Operating Temperature
0 to +70° C
Storage Temperature
-65 to +150° C
Junction Temperature
125° C
Soldering Temperature
260° C
DC Electrical Characteristics
Unless stated otherwise, VDD = 5 V ±5%, Ambient Temperature 0 to +70° C
Parameter
Symbol
Operating Voltage
VDD
Operating Voltage
VDDIO
Conditions
All inputs/outputs
Min.
Typ.
Max.
Units
4.75
5.25
V
3.00
5.25
V
Input High Voltage, X1 pin only
VIH
Input Low Voltage, X1 pin only
VIL
Input High Voltage (except
PS1)
VIH
Input Low Voltage (except
PS1)
VIL
Input High Voltage (PS1 only)
VIH
Input Low Voltage (PS1 only)
VIL
Output High Voltage
VOH
IOH = -25 mA
2.4
Output Low Voltage
VOL
IOL = 25 mA
–
Output High Voltage, CMOS
Level
VOH
IOH = -8 mA
VDD-0.4
Operating Supply Current
IDD5
No load, Note 1
42
mA
Operating Supply Current
IDDIO
No load, VDDIO
= 3.3 V
19
mA
±100
mA
7
pF
3.5
2.5
1.5
VDD-0.5
Input Capacitance, except X1
CIN
Except X1, X2
All clocks
VIN, VCXO Control Voltage
0
4
V
V
0.5
Each output
V
V
0.8
IOS
IDT™ VCXO AND SET-TOP CLOCK SOURCE
V
2
Short Circuit Current
Frequency Synthesis Error
2.5
V
V
–
0.4
V
V
0
ppm
3
V
MK2771-16
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VCXO AND SET-TOP CLOCK SOURCE
VCXO AND SYNTHESIZER
AC Electrical Characteristics
Unless stated otherwise, VDD = 5 V±5%, Ambient Temperature 0 to +70° C
Parameter
Symbol
Conditions
Min.
Crystal Input Frequency
Typ.
Max.
Units
13.5
MHz
Output Clock Rise Time
tOR
0.8 to 2.0 V
1.5
ns
Output Clock Fall Time
tOF
2.0 to 0.8 V
1.5
ns
Output Clock Duty Cycle
tOD
At 1.4 V
Maximum Absolute Jitter,
short term
tja
40
0V < VIN < 3 V, Note 3
27 MHz Output Pullability
±100
60
%
300
ps
±140
ppm
Note 1: With all clocks at highest frequencies.
Note 2: With a pullable crystal that conforms to IDT’s specifications.
Pullable Crystal Specifications
Frequency
13.500000 MHz
Correlation (load) Capacitance
14 pF
C0/C1
240 max.
ESR
25 Ω max.
Operating Temperature
0 to 70°C
Initial Accuracy
±20 ppm
Temperature plus Aging Stability
±50 ppm
External Components
The MK2771-16 requires a minimum number of external components for proper operation. Use a low inductance
ground plane, connect all GNDs to this. Connect 0.01µF decoupling caps on pins 5, 7, 8 and 22 directly to the
ground plane, as close to the MK2771-16 as possible. A series termination resistor of 33Ω 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 14 pF. Consult IDT full specifications. Please obey Application
Note MAN05 for pullable crystal layout info except for the following: the MK2771-16 introduces a GND pin (pin #3)
between the pullable crystal pins. This ground should be brought in straight from the right side underneath the
device.
IDT™ VCXO AND SET-TOP CLOCK SOURCE
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VCXO AND SET-TOP CLOCK SOURCE
VCXO AND SYNTHESIZER
Package Outline and Package Dimensions (28-pin QSOP)
Package dimensions are kept current with JEDEC Publication No. 95
Millimeters
28
Symbol
E1
INDEX
AREA
A
A1
A2
b
c
D
E
E1
e
L
α
E
1 2
D
Min
Inches*
Max
1.35
1.75
0.10
0.25
-1.50
0.20
0.30
0.18
0.25
9.80
10.00
5.80
6.20
3.80
4.00
0.635 Basic
0.40
1.27
0°
8°
Min
Max
0.053
0.069
0.004
0.010
-.059
0.008
0.012
0.007
0.010
0.386
0.394
0.228
0.244
0.150
0.157
0.025 Basic
0.016
0.050
0°
8°
*For reference only. Controlling dimensions in mm.
A
A2
A1
c
- Ce
b
SEATING
PLANE
L
aaa C
Ordering Information
Part / Order Number
Marking
Shipping Packaging
Package
Temperature
MK2771-16RLF
MK2771-16RLF
Tubes
28-pin SSOP
0 to +70° C
MK2771-16RLFTR
MK2771-16RLF
Tape and Reel
28-pin SSOP
0 to +70° C
"LF" suffix to the part number are the Pb-Free configuration and are RoHS compliant.
While the information presented herein has been checked for both accuracy and reliability, Integrated Device Technology (IDT) assumes
no responsibility for either its use or for the infringement of any patents or other rights of third parties, which would result from its use. No
other circuits, patents, or licenses are implied. This product is intended for use in normal commercial applications. Any other applications
such as those requiring extended temperature range, high reliability, or other extraordinary environmental requirements are not
recommended without additional processing by IDT. IDT reserves the right to change any circuitry or specifications without notice. IDT
does not authorize or warrant any IDT product for use in life support devices or critical medical instruments.
IDT™ VCXO AND SET-TOP CLOCK SOURCE
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MK2771-16
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VCXO AND SET-TOP CLOCK SOURCE
VCXO AND SYNTHESIZER
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