ICS627-01

HDTV Set-Top Clock Source

MDS 627-01 B

2

Revision 051600

Integrated Circuit Systems, Inc. • 525 Race Street • San Jose •CA•95126•(408) 295-9800tel • www.icst.com

PRELIMINARY INFORMATION

SA2

X2

X1

VDD

VDD

CLKIN

VDD

VDD

VDD

GND

GND

CLKC/2

CLKC

CLKB

28

27

26

25

24

23

22

21

20

19

18

17

16

15

1

2

3

4

5

6

7

8

9

10

11

12

13

14

Pin Assignment

SA2

SA0

SA0

REFOUT

GND

CLKA

VDD

GND

GND

GND

GND

SB

SA1

SA1

Key: I = Input; O = output; P = power supply connection; XI, XO = crystal connections; CI = clock input

Number

Name

Type

Description

1, 28

SA2

I

Pins 1, 28 should be connected together. Selects CLKA and CLKC frequencies. Internal p-u.

2X2

XO

Connect to a fundamental 27.0 MHz crystal or leave unconnected for clock.

3

X1/ICLK

XI

Connect to a fundamental 27.0 MHz crystal or clock input.

4, 5, 7-9, 22

VDD

P

Connect to 3.3V.

6

CLKIN

CI

Clock input to produce 1001/1000 or 2(1001/1000) at CLKB. See table above.

10, 11, 18, 19

GND

P

Connect to ground.

12

CLKC/2

O

C Clock output divided-by-2. See table above.

13

CLKC

O

C Clock output. See above table.

14

CLKB

O

B Clock output. See above table.

15, 16

SA1

I

Pins 15, 16 should be connected together. Selects CLKA and CLKC frequencies. Internal p-u.

17

SB

I

B Clock Select. Selects CLKB frequency. See above table. Internal pull-up.

20, 21, 24

GND

P

Connect to ground.

23

CLKA

O

A Clock output. See above table.

25

REFOUT

O

27 MHz Reference Output.

26, 27

SA0

I

Pins 26, 27 should be connected together. Selects CLKA and CLKC frequencies. Internal p-u.

0 = connect directly to GND

1 = connect directl to VDD

CLKB Select Table (MHz)

SA2 SA1 SA0

Input

CLKA

CLKC

CLKC/2

0

0

0

27.0

108.0

54.0

27.0

0

0

1

27.0

74.175824*

TEST

TEST

0

1

0

27.0

54.0

54.0

27.0

0

1

1

27.0

74.25*

54.0

27.0

1

0

0

TEST

1

0

1

27.0

74.175824

54.0

27.0

1

1

0

TEST

1

1

1

27.0

74.250

54.0

27.0

CLKA/CLKC Select Table (MHz)

SB

CLKIN

CLKB

Multiplier

0

13.5

27.027

2002/1000

1

27 - 54

27.027 - 54.054

1001/1000

Pin Descriptions

* These selections are recommended for the lowest jitter