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SN74GTLPH16612DGG 데이터시트(PDF) 10 Page - Texas Instruments |
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SN74GTLPH16612DGG 데이터시트(HTML) 10 Page - Texas Instruments |
10 / 11 page SN74GTLPH16612 18-BIT LVTTL-TO-GTLP UNIVERSAL BUS TRANSCEIVER SCES326 – MARCH 2000 10 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 DISTRIBUTED-LOAD BACKPLANE SWITCHING CHARACTERISTICS The previous switching characteristics table shows the switching characteristics of the device into a lumped load (Figure 2). However, the designer’s backplane application most likely is a distributed load, the physical representation as shown in Figure 3. This backplane, or distributed load, can be closely approximated to an RLC circuit, as in Figure 4. This device has been designed for optimum performance into 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. Drvr 1.5 V .25” 2” 1” 1” 1.5 V 1” 1” 2” .25” Rcvr Rcvr Rcvr Figure 3. Medium-Drive Test Backplane Slot 1 Slot 2 Slot 9 Slot 10 Conn. Conn. Conn. Conn. Z0 = 70 Ω From Output Under Test Test Point 1.5 V CL = 9 pF 19 Ω LL = 19 nH Figure 4. Medium-Drive RLC Network switching characteristics over recommended ranges of supply voltage and operating free-air temperature, VTT = 1.5 V and VREF = 1 V for GTLP (see Figure 4)† PARAMETER FROM (INPUT) TO (OUTPUT) MIN TYP‡ UNIT fmax 85 MHz A 3.6 tpd LEAB B 4.3 ns CLKAB 4.4 ten OEAB B 4.1 ns tdis OEAB B 4.3 ns tr Rise time, B outputs (20% to 80%) 1.4 ns tf Fall time, B outputs (80% to 20%) 2.1 ns † TI SPICE simulation data ‡ All typical values are at VCC = 3.3 V, TA = 25°C. |
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