參數(shù)資料
型號： TSB43AA82A1
廠商： Texas Instruments, Inc.
英文描述： 1394 integrated PHY and link layer controller(1394集成PHY和鏈路層控制器)
中文描述： 1394綜合物理層和鏈路層控制器（1394集成物理層和鏈路層控制器）
文件頁數(shù)： 132/146頁
文件大?。?/td> 597K
代理商： TSB43AA82A1
122
Outer Shield Termination
Chassis Ground
Figure 122. Nonisolated Outer Shield Termination for 6-Pin Connector
Outer Shield Termination
Device Ground
Figure 123. Nonisolated Outer Shield Termination for 4-Pin Connector
12.2 Crystal Selection
The TSB43AA82A and other TI PHY devices are designed to use an external 24.576-MHz crystal connected between
the XI and XO pins to provide the reference for an internal oscillator circuit. This oscillator in turn drives a PLL circuit
that generates the various clocks required for transmission and resynchronization of data at the S100 through S400
media data rates.
A variation of less than
±
100 ppm from nominal for the media data rates is required by IEEE Std 1394. Adjacent PHYs
may therefore have a difference of up to 200 ppm from each other in their internal clocks, and PHYs must be able
to compensate for this difference over the maximum packet length. Larger clock variations may cause
resynchronization overflows or underflows, resulting in corrupted packet data.
The following are some typical specifications for crystals used with the physical layers from TI in order to achieve the
required frequency accuracy and stability:
1.
Crystal mode of operation: Fundamental
2.
Frequency tolerance at 25
°
C: Total frequency variation for the complete circuit is
±
100 ppm. A crystal with
±
30 ppm frequency tolerance is recommended for adequate margin.
3.
Frequency stability (over temperature and age): A crystal with
±
30 ppm frequency stability is recommended
for adequate margin.
NOTE: The total frequency variation must be kept below
±
100 ppm from nominal with some allowance for
error introduced by board and device variations. Trade-offs between frequency tolerance and stability may
be made as long as the total frequency variation is less than
±
100 ppm. For example, the frequency
tolerance of the crystal may be specified at 50 ppm and the temperature tolerance may be specified at 30
ppm to give a total of 80 ppm possible variation due to the crystal alone. Crystal aging also contributes to the
frequency variation.
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TSB43AA82AI 制造商:TI 制造商全稱:Texas Instruments 功能描述:1394 Integrated PHY and Link-Layer Controller for SBP-2 Products and DPP Products
TSB43AA82AIPGE 功能描述:1394 接口集成電路 Hi Perf Integr Phy & Link Layer Chip RoHS:否 制造商:Texas Instruments 類型:Link Layer Controller 工作電源電壓: 封裝 / 箱體:LQFP 封裝:Tray
TSB43AA82AIPGEEP 功能描述:1394 接口集成電路 Mil Enh Int PHY and Link-Layer Cntrlr RoHS:否 制造商:Texas Instruments 類型:Link Layer Controller 工作電源電壓: 封裝 / 箱體:LQFP 封裝:Tray
TSB43AA82APGE 功能描述:1394 接口集成電路 Hi Perf Integr Phy & Link Layer Chip RoHS:否 制造商:Texas Instruments 類型:Link Layer Controller 工作電源電壓: 封裝 / 箱體:LQFP 封裝:Tray
TSB43AA82APGEG4 功能描述:1394 接口集成電路 Hi Perf Integr Phy & Link Layer Chip RoHS:否 制造商:Texas Instruments 類型:Link Layer Controller 工作電源電壓: 封裝 / 箱體:LQFP 封裝:Tray
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