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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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SN74GTLP1395DWR 데이터시트(PDF) 11 Page - Texas Instruments |
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SN74GTLP1395DWR 데이터시트(HTML) 11 Page - Texas Instruments |
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11 / 24 page  www.ti.com DISTRIBUTED-LOAD BACKPLANE SWITCHING CHARACTERISTICS From Output Under Test Test Point 1.5 V CL = 18 pF 11 Ω LL = 14 nH Drvr 1.5 V 0.25” 1” 1” 1” 1.5 V 1” 1” 1” 0.25” Rcvr Rcvr Rcvr Slot 1 Slot 2 Slot 19 Slot 20 Conn. Conn. Conn. Conn. ZO = 50 Ω Switching Characteristics SN74GTLP1395 TWO 1-BIT LVTTL-TO-GTLP ADJUSTABLE-EDGE-RATE BUS TRANSCEIVERS WITH SPLIT LVTTL PORT, FEEDBACK PATH, AND SELECTABLE POLARITY SCES349C–JUNE 2001–REVISED JANUARY 2006 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 the backplane. See www.ti.com/sc/gtlp for more information. Figure 2. High-Drive Test Backplane Figure 3. High-Drive RLC Network over recommended operating conditions for the bus transceiver function (unless otherwise noted) (see Figure 3) FROM TO PARAMETER EDGE RATE(1) TYP(2) UNIT (INPUT) (OUTPUT) tPLH 4.3 AB Slow ns tPHL 4.2 tPLH 3.8 AB Fast ns tPHL 3.4 tPLH 6.1 AY Slow ns tPHL 5.9 tPLH 5.6 AY Fast ns tPHL 5.4 Slow 1.5 tr Rise time, B outputs (20% to 80%) ns Fast 1 Slow 2.6 tf Fall time, B outputs (80% to 20%) ns Fast 2 (1) Slow (ERC = H) and Fast (ERC = L) (2) All typical values are at VCC = 3.3 V, TA =25°C. All values are derived from TI SPICE models. 11 |
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