TSB41BA3BIPFP datasheet(13/67 Pages) TI

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TSB41BA3B

IEEE 1394b THREEPORT CABLE TRANSCEIVER/ARBITER

SLLS678 − SEPTEMBER 2005

POST OFFICE BOX 655303

• DALLAS, TEXAS 75265

Terminal Functions (Continued)

TERMINAL

NAME

TYPE

PFP

NO.

GGM

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 terminal powers

down the internal 3.3-V-to-1.8-V regulator. For single-supply (3.3-V only) operation, this

terminal must be tied to GND.

Crystal

F10

G10

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 TSB41AB3

IEEE 1394a−2000 Three-Port Cable Transceiver/Arbiter data sheet, SLLS418. XI is a

1.8-V CMOS input.

TSB41BA3BIPFP Datasheet(PDF) 13 Page - Texas Instruments

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