November 2006
rev 1.3
Pin Configuration
ASM3P2853A
XIN
XOUT
V
DD
V
SS
1
2
3
4
8
7
50MHz
USB Clock
SSONB
PWDNB
ASM3P2853A
6
5
Pin Description
Pin#
Pin
Name
XIN
Type
Description
Connection to crystal or external reference frequency input. This pin has dual
1
I
functions. It can be connected either to an external crystal or an external
reference clock.
Connection to crystal. If using an external reference clock, this pin must be left
unconnected.
Power supply for the analog and digital blocks
Ground to entire chip.
Power-down control pin. Pull low to enable the power-down mode. Connect to
VDD, if not used.
Digital logic input used to enable spread spectrum function (Active LOW).
Spread spectrum is enabled when LOW, disabled when HIGH.
Clock output -1 (48MHz unmodulated)
Clock output -2 (50MHz modulated)
2
3
4
5
6
7
8
XOUT
V
DD
V
SS
PWDNB
SSONB
USB
Clock
50MHz
O
P
P
I
I
O
O
Peak EMI Reducing Solution
Notice: The information in this document is subject to change without notice.
2 of 8
PULSECORE [ PulseCore Semiconductor ]
