전자부품 데이터시트 검색엔진 |
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SN74GTLPH1645GQLR 데이터시트(PDF) 11 Page - Texas Instruments |
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SN74GTLPH1645GQLR 데이터시트(HTML) 11 Page - Texas Instruments |
11 / 22 page www.ti.com Distributed-Load Backplane Switching Characteristics 0.25” Drvr 1.5 V 0.25” 1” 1” 1” 1.5 V 1” 1” 1” Rcvr Rcvr Rcvr Slot 1 Slot 2 Slot 19 Slot 20 Conn. Conn. Conn. Conn. ZO = 50 Ω From Output Under Test Test Point 1.5 V CL = 18 pF 11 Ω LL = 14 nH SN74GTLPH1645 16-BIT LVTTL-TO-GTLP ADJUSTABLE-EDGE-RATE BUS TRANSCEIVER SCES290D – OCTOBER 1999 – REVISED JUNE 2005 The preceding switching characteristics table shows the switching characteristics of the device into a lumped load (Figure 1). However, the designer's backplane application probably is a distributed load. The physical representation is shown in Figure 2. This backplane, or distributed load, can be approximated closely to a resistor inductance capacitance (RLC) circuit, as shown in Figure 3. This device has been designed for optimum performance in this RLC circuit. The following switching characteristics table shows the switching characteristics of the device into the RLC load, to help the designer better understand the performance of the GTLP device in this typical backplane. See www.ti.com/sc/gtlp for more information. Figure 2. High-Drive Test Backplane Figure 3. High-Drive RLC Network 11 |
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