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SN74GTLPH16945VR Datenblatt(PDF) 9 Page - Texas Instruments |
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SN74GTLPH16945VR Datenblatt(HTML) 9 Page - Texas Instruments |
9 / 13 page SN74GTLPH16945 16-BIT LVTTL-TO-GTLP BUS TRANSCEIVER SCES292D – OCTOBER 1999 – REVISED NOVEMBER 2001 9 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 DISTRIBUTED-LOAD BACKPLANE SWITCHING CHARACTERISTICS 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. Drvr 1.5 V .25” 2” 1” 1” 1.5 V 1” 1” 2” .25” Rcvr Rcvr Rcvr Figure 2. Medium-Drive Test Backplane Slot 1 Slot 2 Slot 9 Slot 10 Conn. Conn. Conn. Conn. ZO = 70 Ω From Output Under Test Test Point 1.5 V CL = 9 pF 19 Ω LL = 19 nH Figure 3. 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 3) PARAMETER FROM (INPUT) TO (OUTPUT) TYP† UNIT tPLH A B 4.3 ns tPHL A B 4.3 ns ten OE B 5 ns tdis OE B 4.4 ns tr Rise time, B outputs (20% to 80%) 1 ns tf Fall time, B outputs (80% to 20%) 2 ns † All typical values are at VCC = 3.3 V, TA = 25°C. All values are derived from TI-SPICE models. |
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