ICST MK1704A, MK1704ATR Datasheet

MK1704A

ICRO

C

LOCK

Description

The MK1704A is an upgraded version of the
MK1704 and is recommended for all new designs.
It offers more reduction in the frequency
amplitude peaks, and will support frequencies up
to 140 MHz.

The MK1704A generates a low EMI output clock
from a clock input. The part is designed to dither
the LCD interface clock or other clocks for flat
panel graphics controllers. The MK1704A uses
ICS/MicroClock’s proprietary mixture of analog
and digital Phase-Locked Loop (PLL) technology
to synthesize the frequency, and our patented
technique to spread the frequency spectrum of the
output, thereby reducing the frequency amplitude
peaks by several dB.

Low EMI Clock Generator

Features

• Packaged in 8 pin SOIC

• Provides a spread spectrum output clock

• Supports leading flat panel controllers

• Accepts a clock input, provides same frequency
dithered output

• Optimized for higher resolutions that require up
to 140 MHz, as well as 40 MHz (SVGA) and
65 MHz (XVGA) clocks

• Peak reduction by 7dB - 14 dB typical on 3rd­ 19th odd harmonics

• Low EMI feature can be disabled

• 3.3 V or 5 V ±10% supply voltage

We offer many other clocks for computers and
computer peripherals. Consult us when you need
to remove crystals and oscillators from your board.

Block Diagram

VDD GND

S0
S1

Low EMI

Enable

Input Clock

Crystal

Oscillator

• Advanced, low power CMOS process

• See the MK1714-01 for a multiplier with low
EMI which can operate from a crystal

PLL Clock

Synthesis and

Spread Spectrum

Circuitry

Output

Buffer

Clock Out

MDS 1704A B 1 Revision 062599 Printed 11/15/00

MicroClock Division of ICS • 525 Race Street • San Jose • CA • 95126•[phone]tel•[phone]fax

MK1704A

ICRO

C

LOCK

Low EMI Clock Generator

Pin Assignment

Clock Output Select Table (in MHz)

ICLK

VDD

GND

CLK

1 8
2

3
4

8 pin SOIC

DC

7

S0

6

S1

5

LEE

S1 S0 Min Nom Max Multiplier Mode vs. CLK

0 0 60 135 140 x1 * +0.5, -1.5%
0 1 60 80 120 x1 * +0.5, -1.5%
1 0 30 40 60 x1 SVGA Down 2.5%
1 1 40 65 100 x1 XGA +0.5, -1.5%

*Note: Use only MK1704A with date code of 9909 or later.

Input Freq. spread

Pin Descriptions

Pin # Name Type Description

1 ICLK I Connect to a clock input as shown in the table above.
2 VDD P Connect to +3.3V or +5V.
3 GND P Connect to ground.
4 CLK O Clock Output; equal to input frequency.
5 LEE I Low EMI Enable. Turns on the spread spectrum when high. Internal pull-up.
6 S1 I Frequency Select 1 Input. Selects input/output clock range per table above. Internal pull-up.
7 S0 I Frequency Select 0 Input. Selects input/output clock range per table above. Internal pull-up.
8 DC - Don't Connect. Do not connect anything to this pin.

Key: I = Input, O = output, P = power supply connection

External Components

A minimum number of external components are required for proper operation. A decoupling capacitor of

0.01µF should be connected between VDD and GND on pins 2 and 3, and a 33 Ω terminating resistor
may be used on the clock output if the trace is longer than 1 inch. The MK1704A is designed for use with a

clock input only. For a crystal input, use the MK1704S or the MK1714-01R.

MDS 1704A B 2 Revision 062599 Printed 11/15/00

MicroClock Division of ICS • 525 Race Street • San Jose • CA • 95126•[phone]tel•[phone]fax

MK1704A

DC CHARACTERISTICS (at 5.0V unless otherwise noted)

AC CHARACTERISTICS (at 5.0V unless otherwise noted)

ICRO

C

LOCK

Low EMI Clock Generator

Electrical Specifications

Parameter Conditions Minimum Typical Maximum Units
ABSOLUTE MAXIMUM RATINGS (note 1)

Supply Voltage, VDD Referenced to GND 7 V
Inputs Referenced to GND -0.5 VDD+.5V V
Clock Outputs Referenced to GND -0.5 VDD+.5V V
Ambient Operating Temperature 0 70 °C
Soldering Temperature Max of 10 seconds 260 °C
Storage temperature -65 150 °C

Operating Voltage, VDD 3 5.5 V
Input High Voltage, VIH, input clock only Clock input (VDD/2)+1 VDD/2 V
Input Low Voltage, VIL, input clock only Clock input VDD/2 (VDD/2)-1 V
Output High Voltage, VOH IOH=-4mA VDD-0.4 V
Output High Voltage, VOH IOH=-25mA 2.4 V
Output Low Voltage, VOL IOL=25mA 0.4 V
Operating Supply Current, IDD, 5V No Load 15 mA
Operating Supply Current, IDD, 3.3V No Load 10 mA
Input Capacitance S0, S1 pins 7 pF
Internal Pull-up Resistor LEE pin only 500 kΩ

Input Clock Frequency S1=0, S0=0 60 135 140 MHz
(Note 3) S1=0, S0=1 60 80 120

S1=1, S0=0 30 40 60

S1=1, S0=1 40 65 100
Input Clock Duty Cycle Time above VDD/2 20 80 %
Output Clock Rise Time 0.8 to 2.0V 1.5 ns

Output Clock Fall Time 2.0 to 0.8V 1.5 ns
Output Clock Duty Cycle Time above 1.5V 40 50 60 %
Output Clock Frequency Variation from Mean 1 - 2.5 %
EMI Peak Frequency Reduction

Notes:

1. Stresses beyond those listed under Absolute Maximum Ratings could cause permanent damage to the device. Prolonged exposure
to levels above the operating limits but below the Absolute Maximums may affect device reliability.

2. Typical values are at 25°C.

3. Not tested; guaranteed by design.

3rd-19th odd harmonics

10 to 16 dB

MDS 1704A B 3 Revision 062599 Printed 11/15/00

MicroClock Division of ICS • 525 Race Street • San Jose • CA • 95126•[phone]tel•[phone]fax

MK1704A

Inches

Millimeters

ICRO

C

LOCK

Package Outline and Package Dimensions
8 pin SOIC

E H

Pin 1

h x 45°

c

Q

D

e

b

Low EMI Clock Generator

Symbol Min Max Min Max

A 0.055 0.068 1.397 1.7272
b 0.013 0.019 0.330 0.483

D 0.185 0.200 4.699 5.080

E 0.150 0.160 3.810 4.064

H 0.225 0.245 5.715 6.223

e
h 0.015 0.381
L 0.016 0.035 0.406 0.889

Q 0.004 0.01 0.102 0.254

A

L

Ordering Information

Part/Order Number Marking Package Temperature

MK1704A MK1704A 8 pin SOIC 0 to 70 °C

MK1704ATR MK1704A Add tape and reel 0 to 70 °C

While the information presented herein has been checked for both accuracy and reliability, Integrated Circuit Systems, Inc. (ICS) 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 ICS. ICS reserves the right to change any circuitry or specifications without notice. ICS does not authorize or warrant any
ICS product for use in life support devices or critical medical instruments.

MDS 1704A B 4 Revision 062599 Printed 11/15/00

MicroClock Division of ICS • 525 Race Street • San Jose • CA • 95126•[phone]tel•[phone]fax