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SMSC TMC2005-JT Note 1:, Note 2:, nPLLTST pin, Method To Connect A Crystal Clock, FIGURE 11 - CONNECTING THE CRYSTAL CLOCK

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ARCNET 5 Port HUB Controller

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.

Revision 1.1 (07-24-07)

Page 22

SMSC TMC2005-JT

DATASHEET

Contents

FEATURES GENERAL DESCRIPTION ORDERING INFORMATION Page TABLE OF CONTENTS PIN CONFIGURATION BLOCK DIAGRAM DESCRIPTION OF PIN FUNCTIONS TX/RX Interface FEATURE Operating Mode Setup INPUT PLL Must always connect to VDD Other Signals FEATURES OPERATIONAL DESCRIPTION Direction Determination Direction Release Jitter Filter 1)Input Sampling Option Feature for Jitter Filtering 1)Big jitter (BJ) mode Note: [Complement] 2)Changing polar of RX port APPLICATION NOTES FIGURE 2 - APPLICATION EXAMPLE FIGURE 3 - APPLICATION EXAMPLE FIGURE 4 - APPLICATION EXAMPLE FIGURE 5 - APPLICATION EXAMPLE FIGURE 6 - APPLICATION EXAMPLE FIGURE 7 - APPLICATION EXAMPLE FIGURE 8 - APPLICATION EXAMPLE PORT GROUP CONNECTING THE TMC2005 WITH INTERNAL PLL Method To Connect A Crystal Clock FIGURE 11 - CONNECTING THE CRYSTAL CLOCK Note 1: Note 2: nPLLTST pin CASCADING CONNECTION FIGURE 13 - CASCADE CONNECTION OF 8 PORT HUB FIGURE 14 - CASCADE CONNECTION OF 8 PORT HUB FIGURE 15 - CASCADE CONNECTION OF 16 PORT HUB Ring Network With the TMC2005 FIGURE 16 - RING CONFIGURATION Example for system hang-up Example for no hang-up Note 3: MAXIMUM GUARANTEED RATINGS Vss ITEM SYMBOL RATING DC CHARACTERISTIC - OUTPUT PIN PIN AC CHARACTERISTIC - CLOCK and RESET TYP FIGURE 17 - CLOCK AND RESET AC CHARACTERISTIC – Rx waveforms and Tx waveforms FIGURE 18 - RX WAVEFORMS AND TX WAVEFORMS ITEMS MARK REMARK Page TMC2005-JT64 PIN TQFP PACKAGE OUTLINE