SI51218 Datasheet, PDF (9/13 Pages) Silicon Laboratories – THREE OUTPUTS FACTORY PROGRAMMABLE CLOCK GENERATOR

4. Pin Descriptions—8-Pin TDFN
Si51218
VDD ¹
XOUT ²
XIN/CLKIN ³
CLKOUT1/REFOUT1 ₄
FSEL/OE
Si51218
8 _VDDO
7 _CLKOUT3
6 ^{CLKOUT2/REFOUT2}
FSEL/OE/PD#
5 _VSS
Table 6. Si51218 Pin Descriptions
Pin #
1
Name
VDD
Type
PWR 2.5 to 3.3 V power supply.
Description
2
XOUT
O Crystal output. Leave this pin unconnected (floating) if an external clock
input is used.
3
XIN/CLKIN
I External crystal and clock input.
4 CLKOUT1/REFOUT1/ I/O Programmable CLKOUT1 or REFOUT1 output or MultiFunction control
FSEL/OE
input. The frequency at this pin is synthesized by internal PLL if pro-
grammed as CLKOUT1. If programmed as REFOUT1, output clock is
buffered output of crystal or reference clock input. If programmed as
MultiFunction control input, it can be FSEL and OE.
5
VSS
GND Ground.
6 CLKOUT2/REFOUT2/ I/O Programmable CLKOUT2 or REFOUT2 output or MultiFunction control
FSEL/OE/PD
input. The frequency at this pin is synthesized by internal PLL if pro-
grammed as CLKOUT2. If programmed as REFOUT2, output clock is
buffered output of crystal or reference clock input. If programmed as
MultiFunction control input, it can be FSEL,OE and PD. It is power by
VDDO (pin 8).
7
CLKOUT3
O Programmable CLKOUT3 output. The frequency at this pin is synthe-
sized by internal PLL. It is power by VDDO (pin 8).
8
VDDO
PWR 1.8 to 3.3 V output power supply to CLKOUT2/3 (pin6/7).
Rev. 1.0
9