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SN74GTLP21395DWR データシート(PDF) 10 Page - Texas Instruments |
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SN74GTLP21395DWR データシート(HTML) 10 Page - Texas Instruments |
10 / 21 page SN74GTLP21395 TWO 1-BIT LVTTL-TO-GTLP ADJUSTABLE-EDGE-RATE BUS TRANSCEIVERS WITH SPLIT LVTTL PORT, FEEDBACK PATH, AND SELECTABLE POLARITY SCES350C – JUNE 2001 – REVISED NOVEMBER 2001 10 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 PARAMETER MEASUREMENT INFORMATION From Output Under Test CL = 50 pF (see Note A) LOAD CIRCUIT FOR Y OUTPUTS S1 Open GND 500 Ω 500 Ω TEST tPLH/tPHL tPLZ/tPZL tPHZ/tPZH S1 Open 6 V GND tPLH tPHL Output Control Output Waveform 1 S1 at 6 V (see Note B) Output Waveform 2 S1 at GND (see Note B) VOL VOH tPZL tPZH tPLZ tPHZ 3 V 0 V VOH VOL 0 V VOL + 0.3 V VOH – 0.3 V ≈0 V Input 3 V 3 V VOLTAGE WAVEFORMS PROPAGATION DELAY TIMES (A input to B port) Output 1.5 V Test Point CL = 30 pF (see Note A) From Output Under Test 12.5 Ω LOAD CIRCUIT FOR B OUTPUTS 0 V VOH VOL Input VOLTAGE WAVEFORMS PROPAGATION DELAY TIMES (B port to Y output) Output 1.5 V NOTES: A. CL includes probe and jig capacitance. B. Waveform 1 is for an output with internal conditions such that the output is low except when disabled by the output control. Waveform 2 is for an output with internal conditions such that the output is high except when disabled by the output control. C. All input pulses are supplied by generators having the following characteristics: PRR ≈ 10 MHz, ZO = 50 Ω, tr ≈ 2 ns, tf ≈ 2 ns. D. The outputs are measured one at a time with one transition per measurement. 6 V tPLH tPHL 1.5 V 1.5 V 1.5 V 1.5 V 1.5 V 1.5 V 1.5 V 1.5 V 1 V 1 V 1 V 1 V VOLTAGE WAVEFORMS ENABLE AND DISABLE TIMES (A input) Figure 1. Load Circuits and Voltage Waveforms |
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