MK1704A

Low EMI Clock Generator

MDS 1704A B

2

Revision 062599

Printed 11/15/00

MicroClock Division of ICS • 525 Race Street • San Jose • CA • 95126•(408)295-9800tel•(408)295-9818fax

I C R O

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.

Pin Descriptions

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

Pin Assignment

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.

1

8

2

3

4

7

6

5

ICLK

S0

GND

DC

VDD

LEE

8 pin SOIC

CLK

S1

Clock Output Select Table (in MHz)

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

Input

Freq. spread

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%