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TSB81BA3EIZAJ データシート(PDF) 11 Page - Texas Instruments

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部品番号 TSB81BA3EIZAJ
部品情報  IEEE 1394b THREE-PORT CABLE TRANSCEIVER/ARBITER
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メーカー  TI1 [Texas Instruments]
ホームページ  http://www.ti.com
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TSB81BA3E
www.ti.com
SLLS783A – MAY 2009 – REVISED MAY 2010
TERMINAL FUNCTIONS (continued)
TERMINAL
PFP
ZAJ
DESCRIPTION
PACKAGE
PACKAGE
NAME
TYPE
NO.
NO.
I/O
PLL 3.3-V circuit power terminal. A combination of high-frequency
decoupling capacitors near the terminal are suggested, such as paralleled
0.1 mF and 0.001 mF. Lower frequency 10-mF filtering capacitors are also
recommended. This supply terminal is separated from the DVDD-CORE,
PLLVDD-
Supply
31
N7
DVDD-3.3, PLLVDD-CORE, and AVDD-3.3 terminals internal to the device
3.3
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.
Logic reset input. Asserting this terminal low resets the internal logic. An
internal pullup resistor to VDD is provided so only an external delay
capacitor is required for proper power-up operation (see power-up reset in
RESET
CMOS
75
A6
I
the Applications Information section).
The RESET 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.
This terminal must normally be left unconnected. When this terminal is
probed, the terminal shows a 98.304-MHz signal. If this is perceived as an
RSVD
Osc Out
26
M5
O
EMI problem, then the terminal may be pulled to ground through a 10-k
resistor. However, this causes an increase of up to 340 mA in device current
consumption.
Current setting resistor terminals. These terminals are connected to a
R0
23
N3
precision external resistance to set the internal operating currents and cable
Bias
R1
22
N2
driver output currents. A resistance of 6.34 k
Ω, ±1%, is required to meet the
IEEE Std 1394-1995 output voltage limits.
Test control input. This input is used in the manufacturing test of the
SE
CMOS
35
M10
I
TSB81BA3E. For normal use this terminal must be pulled low either through
a 1-k
Ω resistor to GND or directly to GND.
Test control input. This input is used in the manufacturing test of the
SM
CMOS
36
N10
I
TSB81BA3E. For normal use this terminal must be pulled low either through
a 1-k
Ω resistor to GND or directly to GND.
Test control input. This input is used in the manufacturing test of the
TESTM
CMOS
78
A3
I
TSB81BA3E. For normal use this terminal must be pulled high through a
1-k
Ω resistor to VDD.
Voltage regulator power-down input. When asserted logic high, this pin will
power-down the internal 3.3-V to 1.95-V regulator. For single 3.3-V supply
VREG_PD
CMOS
73
B7
I
operation, this pin should be tied to GND. If an external regulator is used to
supply the 1.95-V PLLVDD-CORE and DVDD-CORE power rails this
terminals should be pulled to Vcc through a 1-k
Ω resistor to VDD.
Port-0 twisted-pair differential-signal terminals. Board traces from each pair
TPA0–
45
K13
of positive and negative differential signal terminals must be kept matched
TPA0+
46
J13
Cable
I/O
and as short as possible to the external load resistors and to the cable
TPB0–
41
M13
connector. Request the S800 1394b layout recommendations document
TPB0+
42
L13
from your Texas Instruments representative.
Port-1 twisted-pair differential-signal terminals. Board traces from each pair
TPA1–
52
F13
of positive and negative differential signal terminals must be kept matched
TPA1+
53
E13
Cable
I/O
and as short as possible to the external load resistors and to the cable
TPB1–
48
H13
connector. Request the S800 1394b layout recommendations document
TPB1+
49
G13
from your Texas Instruments representative.
Port-2 twisted-pair differential-signal terminals. Board traces from each pair
TPA2–
58
B13
of positive and negative differential signal terminals must be kept matched
TPA2+
59
A13
Cable
I/O
and as short as possible to the external load resistors and to the cable
TPB2–
55
D13
connector. Request the S800 1394b layout recommendations document
TPB2+
56
C13
from your Texas Instruments representative.
Copyright © 2009–2010, Texas Instruments Incorporated
Submit Documentation Feedback
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