2

ICS91730

0794D—05/23/05

Pin Descriptions

PIN #

PIN NAME

PIN

TYPE

DESCRIPTION

1CLKIN

PWR

Input for reference clock.

2

VDD

IN

Power supply, nominal 3.3V

3

GND

OUT

Ground pin.

4

CLKOUT

I/O

Modulated clock output.

Un-modulated 3.3V reference clock output.

Frequency select latch input. Refer to the functionality table.

6SDATA

PWR

Data pin for SMBus circuitry, 5V tolerant.

7

SCLK

PWR

Clock pin of SMBus circuitry, 5V tolerant.

8PD#*

PWR

Asynchronous active low input pin, with 120Kohm internal pull-up resistor,

used to power down the device. The internal clocks are disabled and the

VCO and the crystal are stopped.

* Internal Pull-Up Resistor ** Internal Pull-Down Resistor

I/O

REF_OUT/FS_IN1*

5