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TSB11LV01PT Datasheet(PDF) 7 Page - Texas Instruments

No. de pieza TSB11LV01PT
Descripción Electrónicos  3-V 1-PORT IEEE 1394-1995 CABLE TRANSCEIVER/ARBITER
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Fabricante Electrónico  TI [Texas Instruments]
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TSB11LV01PT Datasheet(HTML) 7 Page - Texas Instruments

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TSB11LV01
3-V 1-PORT IEEE 1394-1995 CABLE TRANSCEIVER/ARBITER
SLLS232B – MARCH 1996 – REVISED MAY 1997
7
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
Terminal Functions (continued)
TERMINAL
I/O
TYPE
DESCRIPTION
NAME
NO.
I/O
TYPE
DESCRIPTION
PC0, PC1, PC2
4, 5, 6
I
CMOS
Power class indicators. the PC signals set the bit values of the three power
class bits in the Self-ID packet (bits 21, 22, and 23). These bits can be pro-
grammed by tying the terminals to VCC (high) or to GND (low).
PLLFLT
42
I
CMOS
PLL filter. PLLFLT is connected to a 0.1-
µF capacitor and then to AGND to
complete the internal lag-lead filter. This filter is required for stable opera-
tion of the frequency multiplier PLL running off of the crystal oscillator.
PLLGND
39, 40
Supply
PLL circuit ground. The PLLGND terminals should be tied to the low-imped-
ance circuit board ground plane.
PLLVCC
41
Supply
PLL circuit power. PLLVCC supplies power to the PLL portion of the device.
It is recommended that a combination of high-frequency decoupling capaci-
tors be connected to PLLVCC (i.e., paralleled 0.1 µF and 0.001 µF). Lower
frequency 10-
µF filtering capacitors can also be used. These supply pins
are separated internally in the device to provide noise isolation. These ter-
minals should also be tied at a low impedance point on the circuit board.
Individual filtering networks for each is desired.
PWRDN
43
I
CMOS
Powerdown. When asserted high, PWRDN turns off all internal circuitry
except the CNA monitor circuits that drive the CNA terminal.
R1, R0
31, 32
Bias
Current setting resistor. An internal reference voltage is applied to a resistor
connected between these two terminals to set the operating current and the
cable driver output current. A low TCR 6 k
Ω ±5% resistor should be used to
meet the IEEE 1394-1995 standard requirements for output voltage limits.
RESET
46
I
CMOS
Reset. When RESET is asserted low (active), a bus reset condition is set
on the active cable ports and the the internal logic is reset to the reset start
state. An internal pullup resistor, which is connected to VCC, is provided so
only an external delay capacitor is required. This input is a standard logic
buffer and can also be driven by an open-drain logic output buffer.
SYSCLK
12
O
CMOS
System clock. SYSCLK provides a 49.152-MHz clock signal, which is syn-
chronized with the data transfers, to the link.
TESTM1,
TESTM2
48, 47
I
CMOS
Test mode control. TESTM1 and TESTM2 are used during manufacturing
test and should be tied to VCC.
TPA +
36
I/O
Cable
Port cable pair A. TPA is the port A connection to the twisted pair cable.
Board traces from these terminal should be kept matched and as short as
TPA –
35
Board traces from these terminal should be ke t matched and as short as
possible to the external load resistors and to the cable connector.
TPB +
34
I/O
Cable
Port cable pair B. TPB is the port B connection to the twisted pair cable.
Board traces from these terminal should be kept matched and as short as
TPB –
33
Board traces from these terminal should be ke t matched and as short as
possible to the external load resistors and to the cable connector.
TPBIAS
25
O
Cable
Twisted-pair bias. TPBIAS provides the 1.86-V nominal bias voltage need-
ed for proper operation of the twisted-pair cable drivers and receivers and
for sending a valid cable connection signal to the remote nodes.
XO, XI
37, 38
Crystal
Crystal oscillator. X0 and X1 connect to a 24.576-MHz parallel resonant
fundamental mode crystal. The optimum values for the external shunt ca-
pacitors are dependent on the specifications of the crystal used. The sug-
gested values of 12 pF are appropriate for a crystal with 15 pF specified
loads.


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