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TSB81BA3DPFP 数据表(PDF) 9 Page - Texas Instruments

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部件名 TSB81BA3DPFP
功能描述  IEEE 139b THREE-PORT CABLE TRANSCEIVER/ARBITER
Download  59 Pages
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制造商  TI [Texas Instruments]
网页  http://www.ti.com
标志 TI - Texas Instruments

TSB81BA3DPFP 数据表(HTML) 9 Page - Texas Instruments

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TSB81BA3D, TSB81BA3DI
IEEE 1394b THREEPORT CABLE TRANSCEIVER/ARBITER
SLLS559E − DECEMBER 2002 − REVISED JUNE 2006
9
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
Terminal Functions (Continued)
TERMINAL
I/O
DESCRIPTION
NAME
TYPE
NO.
I/O
DESCRIPTION
PCLK
CMOS
5
O
PHY clock. Provides a 98.304-MHz clock signal, synchronized with data transfers, to the LLC when
the PHY-link interface is operating in the 1394b mode (BMODE asserted). PCLK output provides a
49.152-MHz clock signal, synchronized with data transfers, to the LLC when the PHY-link interface is
in legacy 1394a−2000 (BMODE input deasserted).
PD
CMOS
77
I
Power-down input. A high on this terminal turns off all internal circuitry except the cable-active monitor
circuits, which control the CNA output. Asserting the PD input high also activates an internal pulldown
on the RESETz terminal to force a reset of the internal control logic.
PINT
CMOS
1
O
PHY Interrupt. The PHY uses this output to serially transfer status and interrupt information to the link
when PHY-link interface is in the 1394b mode. A bus holder is built into this terminal.
PLLGND
Supply
25,
28
PLL circuit ground terminals. These terminals must be tied together to the low-impedance circuit
board ground plane.
PLLVDD-CORE
Supply
29,
30
PLL 1.95-V circuit power terminals. A combination of high-frequency decoupling capacitors near each
terminal are suggested, such as paralleled 0.1
µF and 0.001 µF. An additional 1-µF capacitor is
required for voltage regulation, and the PLLVDD-CORE terminals must be separate from the
DVDD-CORE terminals. These supply terminals are separated from the DVDD-CORE, DVDD-3.3,
PLLVDD-3.3 and AVDD-3.3 terminals internal to the device to provide noise isolation.
PLLVDD-3.3
Supply
31
PLL 3.3-V circuit power terminal. A combination of high-frequency decoupling capacitors near the
terminal are suggested, such as paralleled 0.1
µF and 0.001 µF. Lower frequency 10-µF filtering
capacitors are also recommended. This supply terminal is separated from the DVDD-CORE,
DVDD-3.3, PLLVDD-CORE, and AVDD-3.3 terminals internal to the device to provide noise isolation.
The DVDD-3.3 terminals must be tied together at a low-impedance point on the circuit board. The
PLLVDD-3.3, AVDD-3.3, and DVDD-3.3 terminals must be tied together with a low dc impedance
connection.
RESETz
CMOS
75
I
Logic reset input. Asserting this terminal low resets the internal logic. An internal pull-up resistor to
VDD is provided so only an external delay capacitor is required for proper power-up operation (see
power-up reset in the APPLICATIONS INFORMATION section). The RESETz terminal also
incorporates an internal pulldown which is activated when the PD input is asserted high. This input is
otherwise a standard logic input, and can also be driven by an open-drain type driver.
RSVD
26
O
This terminal must normally be left unconnected. When this terminal is probed, the terminal will show
a 98.304-MHz signal. If this is perceived as an EMI problem, then the terminal may be pulled to ground
through a 10-k
Ω resistor. However, this causes an increase of up to 340 µA in device current
consumption.
R0
R1
Bias
23
22
Current setting resistor terminals. These terminals are connected to a precision external resistance to
set the internal operating currents and cable driver output currents. A resistance of 6.34 k
Ω ±1% is
required to meet the IEEE Std 1394−1995 output voltage limits.
SE
CMOS
35
I
Test control input. This input is used in the manufacturing test of the TSB81BA3D. For normal use this
terminal must be pulled low either through a 1-k
Ω resistor to GND or directly to GND.
SM
CMOS
36
I
Test control input. This input is used in the manufacturing test of the TSB81BA3D. For normal use this
terminal must be pulled low either through a 1-k
Ω resistor to GND or directly to GND.
TESTM
CMOS
78
I
Test control input. This input is used in the manufacturing test of the TSB81BA3D. For normal use this
terminal must be pulled high through a 1-k
Ω resistor to VDD.
TESTW
CMOS
73
I
Test control input. This input is used in the manufacturing test of the TSB81BA3D. For normal use
this terminal must be pulled high through a 1-k
Ω resistor to VDD.
TPA0−
TPA0+
TPB0−
TPB0+
Cable
45,
46,
41,
42
I/O
Port 0 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. Please request the S800 1394b layout
recommendations document from your TI representative.
TPA1−
TPA1+
TPB1−
TPB1+
Cable
52
53
48
49
I/O
Port 1 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. Please request the S800 1394b layout
recommendations document from your TI representative.


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