Datasheet

TSB81BA3E
SLLS783A –MAY 2009–REVISED MAY 2010 www.ti.com
TERMINAL FUNCTIONS (continued)
TERMINAL
PFP ZAJ
DESCRIPTION
PACKAGE PACKAGE
NAME TYPE NO. NO. 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
TPBIAS0 47 J12
active cable connection in 1394a-2000 mode. Each of these terminals,
TPBIAS1 Cable 54 E12 I/O
except for an unused port, must be decoupled with a 1-mF capacitor to
TPBIAS2 60 A12
ground. For the unused port, this terminal can be left unconnected. Please
request the S800 1394b layout recommendation documents from your TI
representative.
Oscillator input. This terminal connects to a 98.304-MHz low jitter external
oscillator. The XI terminal is a 1.8-V CMOS input.
Oscillator jitter must be 5 ps RMS or better.
If only 3.3-V oscillators can be acquired, then great care must be taken to
XI Osc In 27 N5 –
not introduce significant jitter by the means used to level shift from 3.3 V to
1.8 V. If a resistor divider is used, then a high current oscillator and
low-value resistors must be used to minimize RC time constants. If a
level-shifting circuit is used, then it must introduce very little jitter. Please
see layout recommendations document.
Absolute Maximum Ratings
(1)
over operating free-air temperature range (unless otherwise noted)
MIN MAX UNIT
V
DD
Supply voltage range
(2)
–0.3 4 V
V
I
Input voltage range
(2)
–0.5 V
DD
+ 0.5 V
V
O
Output voltage range at any output –0.5 V
DD
+ 0.5 V
Continuous total power dissipation See Dissipation Ratings Table
TSB81BA3E 0 70
T
A
Operating free-air temperature °C
TSB81BA3EI –40 85
T
stg
Storage temperature range 65 150 °C
Lead temperature 1.6 mm (1/16 in) from case for 10 s 260 °C
(1) Stresses beyond those listed under "absolute maximum ratings" may cause permanent damage to the device. These are stress ratings
only, and functional operation of the device at these or any other conditions beyond those indicated under "recommended operating
conditions" is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
(2) All voltage values, except differential I/O bus voltages, are with respect to network ground.
Dissipation Ratings
T
A
25°C DERATING FACTOR
(1)
T
A
= 70°C T
A
= 85°C
PACKAGE
POWER RATING ABOVE T
A
= 25°C POWER RATING POWER RATING
PFP
(2) (3)
5.05 W 52.5 mW/°C 2.69 W 1.9 W
PFP
(4) (3)
3.05 W 31.7 mW/°C 1.62 W 1.15 W
(1) This is the inverse of the traditional junction-to-ambient thermal resistance (R
qJA
).
(2) 2-oz. trace and copper pad with solder.
(3) For more information, see the Texas Instruments application note PowerPAD™ Thermally Enhanced Package, (SLMA002).
(4) 2-oz. trace and copper pad without solder.
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