October 2003

P1817A/B

rev 1.0

Low Frequency EMI Reduction

2 of 10

Notice: The information in this document is subject to change without notice.

ModOUT

1

2

3

4

5

6

7

8

P1817A/B

XIN /CLKIN

VSS

SR0

SSON/SBM

REF

VDD

XOUT

Pin Configuration

Pin Description

Pin#

Pin Name

Type

Description

1

XIN/CLKIN

I

Connect to externally generated clock signal. To put the part into standby

mode, disable the input clock signal to this pin and pull SSON/SBM (pin 4)

low. Refer Standby Mode Selection Table.

2

VSS

P

Ground Connection. Connect to system ground.

3

SR0

I

Digital logic input used to select Spreading Range. Refer Spread Spectrum

Selection Table. This pin has an internal pull-up resistor.

4

SSON/SBM

I

Spread Spectrum On/Off and standby mode control. Refer Standby Mode

Selection Table.

5

ModOUT

O

Spread spectrum clock output or reference output. Refer Standby Mode

Selection Table.

6

REF

O

Reference output.

7

VDD

P

Connect to +3.3V or 5.0V.

8

XOUT

O

Connect to crystal. No connect if externally generated clock signal is used.