L-FW802B-DB LSI, L-FW802B-DB Datasheet - Page 10

• Manufacturer Part Number: L-FW802B-DB
• Manufacturer: LSI

Specifications of L-FW802B-DB

• Lead Free Status / RoHS Status: Compliant

FW802B Low-Power PHY IEEE 1394A-2000
Two-Cable Transceiver/Arbiter Device
Signal Information
Table 1. Signal Descriptions (continued)
* Active-low signals are indicated by “/” at the beginning of signal names, within this document.
10
10
26, 27, 62
43, 50, 51
25, 56, 64
30, 31,
32, 49,
52, 53
7, 17,
2, 14,
Pin
37
42
59
60
TPBIAS0
TPBIAS1
Signal*
V
V
V
V
XO
DDA
SSA
XI
DD
SS
(continued)
Analog I/O Portn, Twisted-Pair Bias. (Where n refers to the port number). TPBIAS
Type
—
—
—
—
—
provides the 1.86 V nominal bias voltage needed for proper operation of
the twisted-pair cable drivers and receivers and for sending a valid cable
connection signal to the remote nodes. When the FW802B’s 1394 port
pins are not wired to a connector, the unused port pins may be left uncon-
nected. Internal connect-detect circuitry will keep the port in a discon-
nected state.
Digital Power. V
Analog Circuit Power. V
device.
Digital Ground. All V
ground plane.
Analog Circuit Ground. All V
impedance ground plane.
Crystal Oscillator. XI and XO connect to a 24.576 MHz parallel resonant
fundamental mode crystal. Although, when a 24.576 MHz clock source is
used, it can be connected to XI with XO left unconnected. The optimum
values for the external load capacitors and resistor are dependent on the
specifications of the crystal used. It is necessary to add an external series
resistor (R
the Crystal Selection Considerations section in the data sheet. Note that it
is very important to place the crystal as close as possible to the XO and XI
pins, i.e., within 0.5 in./1.27 cm.
L
) to the XO pin (see Figures 3 and 5). For more details, refer to
DD
supplies power to the digital portion of the device.
SS
signals should be tied to the low-impedance
DDA
Name/Description
supplies power to the analog portion of the
SSA
signals should be tied together to a low-
Data Sheet, Rev. 3
Agere Systems Inc.
May 2004