MK2746GLF datasheet, PDF - EEWORLD Datasheet

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MK2746GLF: DescriptionVideo Clock Generator, 133.33MHz, CMOS, PDSO16, 4.40 MM, 0.65 MM PITCH, TSSOP-16; CategoryThe embedded processor and controller Microcontrollers and processors; File Size148KB，6 Pages; ManufacturerIDT (Integrated Device Technology); Environmental Compliance

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MK2746GLF Overview

Video Clock Generator, 133.33MHz, CMOS, PDSO16, 4.40 MM, 0.65 MM PITCH, TSSOP-16

MK2746GLF Parametric

Parameter Name	Attribute value
Is it lead-free?	Lead free
Is it Rohs certified?	conform to
Maker	IDT (Integrated Device Technology)
Parts packaging code	TSSOP
package instruction	TSSOP, TSSOP16,.25
Contacts	16
Reach Compliance Code	compliant
ECCN code	EAR99
JESD-30 code	R-PDSO-G16
JESD-609 code	e3
length	5 mm
Humidity sensitivity level	1
Number of terminals	16
Maximum operating temperature	70 °C
Minimum operating temperature
Maximum output clock frequency	133.33 MHz
Package body material	PLASTIC/EPOXY
encapsulated code	TSSOP
Encapsulate equivalent code	TSSOP16,.25
Package shape	RECTANGULAR
Package form	SMALL OUTLINE, THIN PROFILE, SHRINK PITCH
Peak Reflow Temperature (Celsius)	260
power supply	3.3 V
Master clock/crystal nominal frequency	27 MHz
Certification status	Not Qualified
Maximum seat height	1.2 mm
Maximum supply voltage	3.6 V
Minimum supply voltage	3 V
Nominal supply voltage	3.3 V
surface mount	YES
technology	CMOS
Temperature level	COMMERCIAL
Terminal surface	Matte Tin (Sn) - annealed
Terminal form	GULL WING
Terminal pitch	0.65 mm
Terminal location	DUAL
Maximum time at peak reflow temperature	30
width	4.4 mm
uPs/uCs/peripheral integrated circuit type	CLOCK GENERATOR, VIDEO

MK2746GLF Preview

DATASHEET

DVD/MPEG CLOCK SOURCE

Description

The MK2746 is a low cost, low jitter, high performance clock

synthesizer for DVD and other MPEG2 based applications.

Using analog Phase Locked Loop (PLL) techniques, the

device accepts a 27 MHz fundamental mode crystal or

clock input to produce multiple output clocks including the

processor clock, audio clock, bus driver clock, SDRAM

clock and a Video clock. The audio clocks are frequency

locked to the 27 MHz input using our patented zero ppm

error techniques, allowing audio and video to track exactly,

thereby eliminating the need for large buffer memory.

IDT manufacturers the largest variety of DVD, set top box,

and multimedia clock synthesizers for all applications.

MK2746

Features

•

Packaged in 16 pin TSSOP

•

Operating voltage of 3.3 V

•

Provides tight jitter controlled selectable processor clock

per table.

•

Provides selectable audio clock per table.

•

Provides fixed outputs of 27 MHz (Video), 50 MHz

(DSP/Bus clock) and 133.33 MHz (SDRAM).

•

Advanced, low power, sub-micron CMOS process

Block Diagram

VDD

Audio

AS1:0

PLL / Clock

Circuit

PS1:0

27 MHz crystal

or clock

Clock Buffer/

Crystal

Ocsillator

Processor

(Tight Jitter)

50M Bus Clock

133.33 M SDRAM Clock

27M Video Clock

GND

IDT™

DVD/MPEG CLOCK SOURCE

MK2746

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MK2746

DVD/MPEG CLOCK SOURCE

VCXO AND SYNTHESIZER

Pin Assignment

X1/ICLK

VDD

GND

PCLK

PS0

133.33M

PS1

VDD

27M

AS0

ACLK

AS1

VDD

GND

50M

Clock Output Select Table

in MHz

AS1

AS0

Audio CLK

12.288

11.2896

18.432

8.192

PS1

PS0

Processor

CLK

66.66

41.66

58.33

16 pin (173 mil) TSSOP

0 = connect directly to GND

1 = connect directly to VDD

Pin Descriptions

Number

Name

X1/ICLK

VDD

GND

PCLK

PS0

133.33M

PS1

50M

GND

VDD

AS1

ACLK

AS0

27M

VDD

Type

Input

Power

Output

Input

Output

Input

Output

Power

Input

Output

Input

Output

Power

Pin Description

Connect to a 27 MHz fundamental mode crystal. Leave open for clock input.

Connect to a 27 MHz fundamental mode crystal or clock.

Connect to +3.3 V.

Connect to ground

Processor clock output. Determined by the status of PS1, PS0 per table

above.

Processor Clock select 0. Selects processor clock per table above.

SDRAM clock output.

Processor Clock select 1. Selects processor clock per table above.

50 MHz clock output.

Connect to ground.

Connect to +3.3 V.

Audio clock select 1. Selects audio clock per table above.

Audio clock output determined by the status of PS1, PS0.

Audio clock select 0. Selects audio clock per table above.

27 MHz clock output.

Connect to +3.3 V.

IDT™

DVD/MPEG CLOCK SOURCE

MK2746

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MK2746

DVD/MPEG CLOCK SOURCE

VCXO AND SYNTHESIZER

External Component Selection

The MK2746 requires a minimum number of external

components for proper operation.

PCB Layout Recommendations

For optimum device performance and lowest output phase

noise, the following guidelines should be observed.

1) The 0.01µF decoupling capacitor should be mounted on

the component side of the board as close to the VDD pin as

possible. No vias should be used between decoupling

capacitor and VDD pin. The PCB trace to VDD pin should

be kept as short as possible, as should the PCB trace to the

ground via. Distance of the ferrite bead and bulk decoupling

from the device is less critical.

2) The external crystal should be mounted just next to the

device with short traces. The X1 and X2 traces should not

be routed next to each other with minimum spaces, instead

they should be separated and away from other traces.

3) To minimize EMI the 33Ω series termination resistor, if

needed, should be placed close to the clock output.

4) An optimum layout is one with all components on the

same side of the board, minimizing vias through other signal

layers (the ferrite bead and bulk decoupling capacitor can be

mounted on the back). Other signal traces should be routed

away from the MK2746. This includes signal traces just

underneath the device, or on layers adjacent to the ground

plane layer used by the device.

Decoupling Capacitors

Decoupling capacitors of 0.01µF should be connected

between VDD and GND as close to the MK2746 as

possible. For optimum device performance, the decoupling

capacitors should be mounted on the component side of the

PCB. Avoid the use of vias in the decoupling circuit.

Series Termination Resistor

When the PCB traces between the clock outputs and the

loads are over 1 inch, series termination should be used. To

series terminate a 50Ω trace (a commonly used trace

impedance) place a 33Ω resistor in series with the clock line,

as close to the clock output pin as possible. The nominal

impedance of the clock output is 20Ω

Crystal Tuning Load Capacitors

For a crystal input, a parallel resonant fundamental mode

crystal should be used. Crystal capacitors must be

connected between each of the pins X1 and X2 to ground.

The value (in pF) of these crystal caps should equal

(CL-6)*2. In this equation CL is equal to the crystal load

capacitance in pF. As an example, for a crystal with an 18 pF

load capacitance, each crystal capacitor would be 24 pF

[(18-6)*2=24].

Absolute Maximum Ratings

Stresses above the ratings listed below can cause permanent damage to the MK2746. 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

Supply Voltage, VDD

All Inputs and Outputs

Ambient Operating Temperature

Storage Temperature

Soldering Temperature

Rating

-0.5 V to VDD+0.5 V

0 to +70° C

-65 to +150° C

260° C

IDT™

DVD/MPEG CLOCK SOURCE

MK2746

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MK2746

DVD/MPEG CLOCK SOURCE

VCXO AND SYNTHESIZER

Recommended Operation Conditions

Parameter

Ambient Operating Temperature

Power Supply Voltage (measured in respect to GND)

Min.

+3.0

Typ.

Max.

+70

+3.6

Units

DC Electrical Characteristics

VDD=3.3 V ±10%

, Ambient temperature 0 to +70° C, unless stated otherwise

Parameter

Operating Voltage

Input High Voltage

Input Low Voltage

Input High Voltage

Input Low Voltage

Output High Voltage

Output Low Voltage

Output High Voltage (CMOS

Level)

Operating Supply Current

Short Circuit Current

Input Capacitance

Nominal Output Impedance

On Chip Pull-up Resistor

Symbol

VDD

IDD

OUT

Conditions

input selects

ICLK

= -12 mA

= 12 mA

= -4 mA

No load

Min.

3.0

2.0

Typ.

Max.

3.6

0.8

Units

(VDD/2)-1

2.4

VDD/2

(VDD/2)+1

0.4

VDD-0.4

±70

Ω

kΩ

AS1, AS0 pins

PS1 pin

120

510

AC Electrical Characteristics

VDD = 3.3 V ±10%

, Ambient Temperature 0 to +70° C, unless stated otherwise

Parameter

Input Frequency

Output Rise Time

Output Fall Time

Output Clock Duty Cycle

Maximum Output Jitter,

short term, peak to peak

Maximum Output Jitter,

short term, peak to peak

Maximum Output Jitter,

long term, peak to peak

20% to 80% of VDD, Note 1

80% to 20% of VDD, Note 1

at VDD/2, Note 1

PCLK output, Note 1

All clocks, except PCLK,

Note 1

1000 cycles, except ACLK,

Note 1

Symbol

Conditions

Min.

Typ.

1.0

+100

+200

750

Max. Units

MHz

1.8

Note 1: Measured with 15 pF Load.

IDT™

DVD/MPEG CLOCK SOURCE

MK2746

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MK2746

DVD/MPEG CLOCK SOURCE

VCXO AND SYNTHESIZER

Package Outline and Package Dimensions

(16-pin TSSOP, 4.40 mm Body, 0.65 mm Pitch)

Package dimensions are kept current with JEDEC Publication No. 95

Millimeters

Symbol

Min

Max

Inches*

Min

Max

IN D EX

AR EA

aaa

1.20

0.05

0.15

0.80

1.05

0.19

0.30

0.09

0.20

4.90

5.1

6.40 BASIC

4.30

4.50

0.65 Basic

0.45

0.75

0°

8°

0.10

0.047

0.002

0.006

0.032

0.041

0.007

0.012

0.0035 0.008

0.193

0.201

0.252 BASIC

0.169

0.177

0.0256 Basic

0.018

0.030

0°

8°

0.004

*For reference only. Controlling dimensions in mm.

-C -

S E A TIN G

P LA N E

aaa

Ordering Information

Part / Order Number

MK2746GLF

MK2746GLFT

Marking

MK2746GL

Shipping Packaging

Tubes

Tape and Reel

Package

16-pin TSSOP

Temperature

0 to +70° C

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™

DVD/MPEG CLOCK SOURCE

MK2746

REV C 051310

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