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SN74GTLPH16912 데이터시트(PDF) 11 Page - Texas Instruments |
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SN74GTLPH16912 데이터시트(HTML) 11 Page - Texas Instruments |
11 / 14 page SN74GTLPH16912 18-BIT LVTTL-TO-GTLP UNIVERSAL BUS TRANSCEIVER SCES288C – OCTOBER 1999 – REVISED JULY 2001 11 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 4.5 ns tPHL A B 4.5 ns tPLH LEAB B 4.7 ns tPHL LEAB B 4.7 ns tPLH CLKAB B 4.7 ns tPHL CLKAB B 4.7 ns ten OEAB B 4.8 ns tdis OEAB B 4.4 ns tr Rise time, B outputs (20% to 80%) 1.2 ns tf Fall time, B outputs (80% to 20%) 2.5 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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