2

ICS91718

0500D—07/15/04

Pin Descriptions

PIN

#

PIN NAME

PIN

TYPE

DESCRIPTION

1

CLKIN

IN

Input clock

2

VDD

PWR

Power supply, nominal 3.3V

3

GND

PWR

Ground pin.

4

**CLKOUT/FS_IN0

I/O

CLKOUT modulated clock output

FS_IN0 latched input, selects modulation percentage/type

5

REF_OUT/FS_IN1**

I/O

REF_OUT, unmodulated reference clock output

FS_IN1 latched input, selects modulation percentage/type

6

SDATA

I/O

Data pin for I2C circuitry 5V tolerant

7

SCLK

IN

Clock pin of I2C circuitry 5V tolerant

8PD#*

IN

Asynchronous active low input pin used to power down the device into a

low power state. The internal clocks are disabled and the VCO and the

crystal are stopped. The latency of the power down will not be greater

than 1.8ms.

* Internal Pull-Up Resistor

** Internal Pull-Down Resistor