SMSC TMC2005-JT - Manual (Page 9)

ARCNET 5 Port HUB Controller
Datasheet
SMSC TMC2005-JT Page 9 Revision 1.1 (07-24-07)
DATASHEET
FEATURE NAME
INPUT/
OUTPUT DESCRIPTION
nPLLTST INPUT Test pin for PLL.
Must always connect to VDD.
AVDD Analog power supply
Using PLL: Analog power supply. There are some
limits on PCB pattern.
Using no PLL: Power supply (+5V) same as VDD1~6.
AVSS Analog ground
Using PLL: Analog ground. There are some limits on
PCB pattern.
Using no PLL: Use a ground same as VSS1~8.
Other Signals
FEATURES NAME
INPUT/
OUTPUT DESCRIPTION
CRYSTAL
INTERFACE XTLI INPUT Connect a 20MHz crystal.
When supplying an external clock,
input the clock to this pin.
CRYSTAL
INTERFACE XTLO OUTPUT Connect a 20MHz crystal.
When supplying an external clock, it
must be open.
SYSTEM RESET
INTERFACE nRST INPUT Reset for initializing TMC2005. (active
Low)
TEST PIN CKO OUTPUT Output internal clock of TMC2005.
TEST PIN nCKOEN INPUT Output control of CKO.
0: Output internal clock on CKO.
1: Always output Low level on CKO.
Set “1” Normally.
TEST PIN RXFLT INPUT It must be open
TEST PIN NC [1:2] It must be open
POWER SUPPLY VDD [1:6] Power supply (+5V)
GROUND VSS [1:8] Ground