TSB41BA3BTPFPEP datasheet(12/68 Pages) TI1

12 / 68 page

TSB41BA3BEP

IEEE 1394b THREEPORT CABLE TRANSCEIVER/ARBITER

SGLS362—MAY 2006

POST OFFICE BOX 655303

• DALLAS, TEXAS 75265

POST OFFICE BOX 1443

• HOUSTON, TEXAS 77251−1443

Terminal Functions (Continued)

TERMINAL

NAME

TYPE

PFP

NO.

I/O

DESCRIPTION

TPA2−

TPA2+

TPB2−

TPB2+

Cable

I/O

Port 2 twisted-pair differential-signal terminals. Board traces from each pair of positive and negative

differential signal terminals must be kept matched and as short as possible to the external load

resistors and to the cable connector. Request the S800 1394b layout recommendations document

from your Texas Instruments representative.

TPBIAS0_SD0

TPBIAS1_SD1

TPBIAS2_SD2

Cable

I/O

Twisted-pair bias output and signal detect input. This provides the 1.86-V nominal bias voltage

needed for proper operation of the twisted-pair cable drivers and receivers, and for signaling to the

remote nodes that there is an active cable connection in 1394a-2000 mode. Each of these

terminals, except for an unused port, must be decoupled with a 1-

µF capacitor to ground. For the

unused port, this terminal can be left unconnected.

When a port is configured as a Beta-mode port (B1, B2, B4) this terminal becomes an input and

must be high when a valid signal is present. For optical transceivers, the signal detect of the

transceiver must be connected to this terminal. The input is an LVCMOS level input.

VREG_PD

CMOS

Voltage regulator power-down input. When asserted logic high, this pin powers down the

internal 3.3-V-to-1.8-V regulator. For single-supply (3.3-V only) operation, this pin must be tied

to GND.

Crystal

Crystal oscillator inputs. These terminals connect to a 49.152-MHz parallel resonant fundamental

mode crystal. The optimum values for the external shunt capacitors depend on the specifications of

the crystal used (see the crystal selection section in the document SLLS418). XI is a 1.8-V CMOS

input.

TSB41BA3BTPFPEP Datasheet(PDF) 12 Page - Texas Instruments

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