User Manual Smsc Switch Tmc2005-Jt [22/32 Pages]

SMSC switch TMC2005-JT

ARCNET 5 Port HUB Controller

Datasheet

Revision 1.1 (07-24-07) Page 22 SMSC TMC2005-JT

DATASHEET

Method To Connect A Crystal Clock

Connect with external parts as follows:

FIGURE 11 - CONNECTING THE CRYSTAL CLOCK

Note 1: When designing a printed circuit board, keep the patterns as short as possible and don’t cross with other

patterns.

Note 2: When using an external clock like an oscillator module, connect it to XTLI pin and leave XTLO pin open.

When designing a printed circuit board, wire between XTLI pin and oscillator should be short as possible.

nPLLTST pin

nPLLTST must be connect toVDD. The rest of input pins have pull-up resistors built in, but nPLLTST pin does not

have the pull-up resistor. Clock signal cannot ditributed into the TMC2005 if nPLLTST pin is connected GND or is left

open.