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SN74HCT157 Scheda tecnica(PDF) 5 Page - Texas Instruments |
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SN74HCT157 Scheda tecnica(HTML) 5 Page - Texas Instruments |
5 / 6 page SN54HCT157, SN74HCT157 QUADRUPLE 2-LINE TO 1-LINE DATA SELECTORS/MULTIPLEXERS SCLS071B – NOVEMBER 1988 – REVISED MAY 1997 5 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 PARAMETER MEASUREMENT INFORMATION VOLTAGE WAVEFORMS PROPAGATION DELAY TIMES 1.3 V 1.3 V 1.3 V 10% 10% 90% 90% 3 V VOH VOL 0 V tr tf Input (see Note B) Output 1.3 V tPLH tPHL Test Point From Output Under Test LOAD CIRCUIT NOTES: A. CL includes probe and test-fixture capacitance. B. Phase relationships between waveforms were chosen arbitrarily. All input pulses are supplied by generators having the following characteristics: PRR ≤ 1 MHz, ZO = 50 Ω, tr = 6 ns, tf = 6 ns. C. The outputs are measured one at a time with one input transition per measurement. D. tPLH and tPHL are the same as tpd. CL = 50 pF (see Note A) Figure 1. Load Circuit and Voltage Waveforms |
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