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SN74ACT244IPWRQ1 Datasheet(PDF) 4 Page - Texas Instruments |
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SN74ACT244IPWRQ1 Datasheet(HTML) 4 Page - Texas Instruments |
4 / 8 page SN74ACT244Q1 OCTAL BUFFER/DRIVER WITH 3STATE OUTPUTS SCAS766B − APRIL 2004 − REVISED JANUARY 2008 4 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 PARAMETER MEASUREMENT INFORMATION From Output Under Test CL = 50 pF (see Note A) LOAD CIRCUIT S1 2 × VCC 500 Ω 500 Ω tPLH tPHL Output Control (low-level enabling) Output Waveform 1 S1 at 2 × VCC (see Note B) Output Waveform 2 S1 at Open (see Note B) VOL VOH tPZL tPZH tPLZ tPHZ 1.5 V 1.5 V 1.5 V 1.5 V ≈VCC 3 V 0 V 50% VCC 50% VCC VOH VOL 0 V 50% VCC VOL + 0.3 V 50% VCC ≈0 V 3 V Open Input Output VOLTAGE WAVEFORMS VOLTAGE WAVEFORMS tPLH/tPHL tPLZ/tPZL tPHZ/tPZH Open 2 × VCC Open TEST S1 VOH − 0.3 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 ≤ 1 MHz, ZO = 50 Ω, tr ≤ 2.5 ns, tf ≤ 2.5 ns. D. The outputs are measured one at a time, with one input transition per measurement. Figure 1. Load Circuit and Voltage Waveforms |
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