ICS487G-25LFT datasheet(2/6 Pages) ICST

Part #	ICS487G-25LFT

Description	Quad PLL for DTV

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Quad PLL for DTV

MDS 487-25 A

2

Revision 050604

Integrated Circuit Systems l 525 Race Street, San Jose, CA 95126 l tel (408) 297-1201 l

www.icst.com

ICS487-25

Pin Assignment

ACLK Output Selection Table

Note: When S1 and S0 are switched, all other output

clocks will remain stable throughout the transition.

Pin Descriptions

12

1

11

2

10

3

9

X1/ICLK

4

S0

5

S1

6

VDD

7

48M

8

VDD

PDTS

GND

VDD

GND

ACLK

20M

33.0M

16

15

14

13

24.576M

X2

16 pin (173 mil) TSSOP

S1

S0

ACLK (MHz)

0

18.432

0

1

16.9344

1

0

12.288

1

18.432

Number

Name

Type

Pin Description

1

X1/ICLK

Input

Crystal connection. Connect to 27 MHz crystal or clock input.

2

S0

Input

Select pin 0. Determines ACLK output frequency per table above.

Internal pull up resistor.

3

S1

Input

Select pin 1. Determines ACLK output frequency per table above.

Internal pull up resistor.

4

48M

Output

48 MHz clcok output. Weak internal pull-down when tri-state.

5

VDD

Power

Connect to +3.3 V.

6

GND

Power

Connect to ground.

7

20M

Output

20 MHz clock output. Weak internal pull-down when tri-state.

8

24.576M

Output

24.576 MHz clock output. Weak internal pull-down when tri-state.

9

ACLK

Output

Audio clock output. Determined by table above. Weak internal

pull-down when tri-state

10

33.0M

Output

33.0 MHz clock output. Weak internal pull-down when tri-state.

11

GND

Power

Connect to ground.

12

VDD

Power

Connect to +3.3 V.

13

GND

Power

Connect to ground.

14

PDTS

Input

Powers down entire chip and tri-states outputs when low. Internal

pull-up resistor.

15

VDD

Power

Connect to +3.3 V.

16

X2

Input

Connect to 27 MHz crystal or float for clock input.

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