- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄382649 > TMX320TCI6482ZTZ (Texas Instruments, Inc.) Communications Infrastructure Digital Signal Processor PDF資料下載
參數(shù)資料
| 型號(hào)： | TMX320TCI6482ZTZ |
| 廠商： | Texas Instruments, Inc. |
| 元件分類： | 數(shù)字信號(hào)處理 |
| 英文描述： | Communications Infrastructure Digital Signal Processor |
| 中文描述： | 通信基礎(chǔ)設(shè)施的數(shù)字信號(hào)處理器 |
| 文件頁(yè)數(shù)： | 74/255頁(yè) |
| 文件大?。?/td> | 1893K |
| 代理商： | TMX320TCI6482ZTZ |
第1頁(yè)第2頁(yè)第3頁(yè)第4頁(yè)第5頁(yè)第6頁(yè)第7頁(yè)第8頁(yè)第9頁(yè)第10頁(yè)第11頁(yè)第12頁(yè)第13頁(yè)第14頁(yè)第15頁(yè)第16頁(yè)第17頁(yè)第18頁(yè)第19頁(yè)第20頁(yè)第21頁(yè)第22頁(yè)第23頁(yè)第24頁(yè)第25頁(yè)第26頁(yè)第27頁(yè)第28頁(yè)第29頁(yè)第30頁(yè)第31頁(yè)第32頁(yè)第33頁(yè)第34頁(yè)第35頁(yè)第36頁(yè)第37頁(yè)第38頁(yè)第39頁(yè)第40頁(yè)第41頁(yè)第42頁(yè)第43頁(yè)第44頁(yè)第45頁(yè)第46頁(yè)第47頁(yè)第48頁(yè)第49頁(yè)第50頁(yè)第51頁(yè)第52頁(yè)第53頁(yè)第54頁(yè)第55頁(yè)第56頁(yè)第57頁(yè)第58頁(yè)第59頁(yè)第60頁(yè)第61頁(yè)第62頁(yè)第63頁(yè)第64頁(yè)第65頁(yè)第66頁(yè)第67頁(yè)第68頁(yè)第69頁(yè)第70頁(yè)第71頁(yè)第72頁(yè)第73頁(yè)當(dāng)前第74頁(yè)第75頁(yè)第76頁(yè)第77頁(yè)第78頁(yè)第79頁(yè)第80頁(yè)第81頁(yè)第82頁(yè)第83頁(yè)第84頁(yè)第85頁(yè)第86頁(yè)第87頁(yè)第88頁(yè)第89頁(yè)第90頁(yè)第91頁(yè)第92頁(yè)第93頁(yè)第94頁(yè)第95頁(yè)第96頁(yè)第97頁(yè)第98頁(yè)第99頁(yè)第100頁(yè)第101頁(yè)第102頁(yè)第103頁(yè)第104頁(yè)第105頁(yè)第106頁(yè)第107頁(yè)第108頁(yè)第109頁(yè)第110頁(yè)第111頁(yè)第112頁(yè)第113頁(yè)第114頁(yè)第115頁(yè)第116頁(yè)第117頁(yè)第118頁(yè)第119頁(yè)第120頁(yè)第121頁(yè)第122頁(yè)第123頁(yè)第124頁(yè)第125頁(yè)第126頁(yè)第127頁(yè)第128頁(yè)第129頁(yè)第130頁(yè)第131頁(yè)第132頁(yè)第133頁(yè)第134頁(yè)第135頁(yè)第136頁(yè)第137頁(yè)第138頁(yè)第139頁(yè)第140頁(yè)第141頁(yè)第142頁(yè)第143頁(yè)第144頁(yè)第145頁(yè)第146頁(yè)第147頁(yè)第148頁(yè)第149頁(yè)第150頁(yè)第151頁(yè)第152頁(yè)第153頁(yè)第154頁(yè)第155頁(yè)第156頁(yè)第157頁(yè)第158頁(yè)第159頁(yè)第160頁(yè)第161頁(yè)第162頁(yè)第163頁(yè)第164頁(yè)第165頁(yè)第166頁(yè)第167頁(yè)第168頁(yè)第169頁(yè)第170頁(yè)第171頁(yè)第172頁(yè)第173頁(yè)第174頁(yè)第175頁(yè)第176頁(yè)第177頁(yè)第178頁(yè)第179頁(yè)第180頁(yè)第181頁(yè)第182頁(yè)第183頁(yè)第184頁(yè)第185頁(yè)第186頁(yè)第187頁(yè)第188頁(yè)第189頁(yè)第190頁(yè)第191頁(yè)第192頁(yè)第193頁(yè)第194頁(yè)第195頁(yè)第196頁(yè)第197頁(yè)第198頁(yè)第199頁(yè)第200頁(yè)第201頁(yè)第202頁(yè)第203頁(yè)第204頁(yè)第205頁(yè)第206頁(yè)第207頁(yè)第208頁(yè)第209頁(yè)第210頁(yè)第211頁(yè)第212頁(yè)第213頁(yè)第214頁(yè)第215頁(yè)第216頁(yè)第217頁(yè)第218頁(yè)第219頁(yè)第220頁(yè)第221頁(yè)第222頁(yè)第223頁(yè)第224頁(yè)第225頁(yè)第226頁(yè)第227頁(yè)第228頁(yè)第229頁(yè)第230頁(yè)第231頁(yè)第232頁(yè)第233頁(yè)第234頁(yè)第235頁(yè)第236頁(yè)第237頁(yè)第238頁(yè)第239頁(yè)第240頁(yè)第241頁(yè)第242頁(yè)第243頁(yè)第244頁(yè)第245頁(yè)第246頁(yè)第247頁(yè)第248頁(yè)第249頁(yè)第250頁(yè)第251頁(yè)第252頁(yè)第253頁(yè)第254頁(yè)第255頁(yè)
www.ti.com
3.7 Pullup/Pulldown Resistors
TMS320TCI6482
Communications Infrastructure Digital Signal Processor
SPRS246F–APRIL 2005–REVISED MAY 2007
Proper board design should ensure that input pins to the TCI6482 device always be at a valid logic level
and not floating. This may be achieved via pullup/pulldown resistors. The TCI6482 device features internal
pullup (IPU) and internal pulldown (IPD) resistors on most pins to eliminate the need, unless otherwise
noted, for external pullup/pulldown resistors.
An external pullup/pulldown resistor needs to be used in the following situations:
Device Configuration Pins
: If the pin is both routed out and 3-stated (not driven), an external
pullup/pulldown resistor
must
be used, even if the IPU/IPD matches the desired value/state.
Other Input Pins
: If the IPU/IPD does not match the desired value/state, use an external
pullup/pulldown resistor to pull the signal to the opposite rail.
For the device configuration pins (listed in
Table 3-1
), if they are both routed out and 3-stated (not driven),
it is
strongly
recommended that an external pullup/pulldown resistor be implemented. Although, internal
pullup/pulldown resistors exist on these pins and they may match the desired configuration value,
providing external connectivity can help ensure that valid logic levels are latched on these device
configuration pins. In addition, applying external pullup/pulldown resistors on the device configuration pins
adds convenience to the user in debugging and flexibility in switching operating modes.
Tips for choosing an external pullup/pulldown resistor:
Consider the total amount of current that may pass through the pullup or pulldown resistor. Make sure
to include the leakage currents of all the devices connected to the net, as well as any internal pullup or
pulldown resistors.
Decide a target value for the net. For a pulldown resistor, this should be below the lowest V
IL
level of
all inputs connected to the net. For a pullup resistor, this should be above the highest V
IH
level of all
inputs on the net. A reasonable choice would be to target the V
OL
or V
OH
levels for the logic family of
the limiting device; which, by definition, have margin to the V
IL
and V
IH
levels.
Select a pullup/pulldown resistor with the largest possible value; but, which can still ensure that the net
will reach the target pulled value when maximum current from all devices on the net is flowing through
the resistor. The current to be considered includes leakage current plus, any other internal and
external pullup/pulldown resistors on the net.
For bidirectional nets, there is an additional consideration which sets a lower limit on the resistance
value of the external resistor. Verify that the resistance is small enough that the weakest output buffer
can drive the net to the opposite logic level (including margin).
Remember to include tolerances when selecting the resistor value.
For pullup resistors, also remember to include tolerances on the DV
DD
rail.
For most systems, a 1-k
resistor can be used to oppose the IPU/IPD while meeting the above criteria.
Users should confirm this resistor value is correct for their specific application.
For most systems, a 20-k
resistor can be used to compliment the IPU/IPD on the device configuration
pins while meeting the above criteria. Users should confirm this resistor value is correct for their specific
application.
For more detailed information on input current (I
I
), and the low-/high-level input voltages (V
IL
and V
IH
) for
the TCI6482 device, see
Section 7.3
,
Electrical Characteristics Over Recommended Ranges of Supply
Voltage and Operating Case Temperature
.
To determine which pins on the TCI6482 device include internal pullup/pulldown resistors, see
Table 2-3
,
Terminal Functions
.
Device Configuration
74
Submit Documentation Feedback
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| TMX320TCI6482ZTZ8 | Communications Infrastructure Digital Signal Processor |
| TMX320TCI6482ZTZA | Communications Infrastructure Digital Signal Processor |
| TMX320TCI6482ZTZA8 | Communications Infrastructure Digital Signal Processor |
| TMX380SRAFNL | Communications Interface |
| TMX70A2400AJDL | Modem Controller |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TMX320TCI6616XCYP | 制造商:Texas Instruments 功能描述: |
| TMX320VC33PGE | 制造商:Texas Instruments 功能描述: |
| TMX320VC5401PGE50 | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| TMX320VC5402GGLL100 | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| TMX320VC5402GGU100 | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。