2

ICS91720

0698D—10/05/04

Pin Description

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.

Modulated clock output.

Frequency select latch input. Refer to the functionality table.

Un-modulated 3.3V reference clock output.

Frequency select latch input. Refer to the functionality table.

6

SDATA

PWR

Data pin for I2C circuitry 5V tolerant

7

SCLK

PWR

Clock pin of I2C circuitry 5V tolerant

8PD#*

PWR

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

I/O

I/O

4

**CLKOUT/FS_IN0

REF_OUT/FS_IN1*

5