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74GTLPH306DGVRE4 Datasheet(PDF) 8 Page - Texas Instruments |
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74GTLPH306DGVRE4 Datasheet(HTML) 8 Page - Texas Instruments |
8 / 17 page www.ti.com Distributed-Load Backplane Switching Characteristics From Output Under Test Test Point 1.5 V CL = 9 pF 19 Ω LL = 19 nH Drvr 1.5 V 0.25” 2” 1” 1” 1.5 V 1” 1” 2” 0.25” Rcvr Rcvr Rcvr Slot 1 Slot 2 Slot 9 Slot 10 Conn. Conn. Conn. Conn. ZO = 70 Ω Switching Characteristics SN74GTLPH306 8-BIT LVTTL-TO-GTLP BUS TRANSCEIVER SCES284E – OCTOBER 1999 – REVISED APRIL 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 3. Medium-Drive RLC Network Figure 2. Medium-Drive Test Backplane over recommended ranges of supply voltage and operating free-air temperature, V TT = 1.5 V and VREF = 1 V for GTLP (see Figure 3) FROM TO PARAMETER TYP(1) UNIT (INPUT) (OUTPUT) tPLH 3.6 A B ns tPHL 4.1 ten 4.4 OE B ns tdis 4.6 tr Rise time, B outputs (20% to 80%) 1.2 ns tf Fall time, B outputs (80% to 20%) 2.2 ns (1) All typical values are at VCC = 3.3 V, TA = 25°C. All values are derived from TI-SPICE models. 8 |
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