Peak EMI Reducing Solution

2 of 8

November 2006

ASM3P2853A

rev 1.3

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

Pin Configuration

Pin Description

Pin#

Pin

Name

Type

Description

1

XIN

I

Connection to crystal or external reference frequency input. This pin has dual

functions. It can be connected either to an external crystal or an external

reference clock.

2

XOUT

O

Connection to crystal. If using an external reference clock, this pin must be left

unconnected.

3

P

Power supply for the analog and digital blocks

4

P

Ground to entire chip.

5

PWDNB

I

Power-down control pin. Pull low to enable the power-down mode. Connect to

VDD, if not used.

6

SSONB

I

Digital logic input used to enable spread spectrum function (Active LOW).

Spread spectrum is enabled when LOW, disabled when HIGH.

7

USB

Clock

O

Clock output -1 (48MHz unmodulated)

8

50MHz

O

Clock output -2 (50MHz modulated)

50MHz

XOUT

XIN

8

7

6

5

1

2

3

4

ASM3P2853A

PWDNB

SSONB

USB Clock