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SN74HC157DT 데이터시트(PDF) 5 Page - Texas Instruments |
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SN74HC157DT 데이터시트(HTML) 5 Page - Texas Instruments |
5 / 21 page SN54HC157, SN74HC157 QUADRUPLE 2LINE TO 1LINE DATA SELECTORS/MULTIPLEXERS SCLS113D − DECEMBER 1982 − REVISED SEPTEMBER 2003 5 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 switching characteristics over recommended operating free-air temperature range, CL = 150 pF (unless otherwise noted) (see Figure 1) PARAMETER FROM TO VCC TA = 25°C SN54HC157 SN74HC157 UNIT PARAMETER FROM (INPUT) TO (OUTPUT) VCC MIN TYP MAX MIN MAX MIN MAX UNIT 2 V 81 190 290 235 A or B Y 4.5 V 23 38 58 47 A or B Y 6 V 18 33 49 41 2 V 81 210 320 260 tpd A/B Y 4.5 V 23 42 64 52 ns tpd A/B Y 6 V 18 36 54 45 ns 2 V 91 190 290 235 G Y 4.5 V 24 38 58 47 G Y 6 V 18 33 49 41 2 V 45 210 315 265 tt Y 4.5 V 17 42 63 53 ns tt Y 6 V 13 36 53 45 ns operating characteristics, TA = 25°C PARAMETER TEST CONDITIONS TYP UNIT Cpd Power dissipation capacitance No load 40 pF PARAMETER MEASUREMENT INFORMATION VOLTAGE WAVEFORM INPUT RISE AND FALL TIMES 50% 50% 10% 10% 90% 90% VCC 0 V tr tf Input VOLTAGE WAVEFORMS PROPAGATION DELAY AND OUTPUT TRANSITION TIMES 50% 50% 50% 10% 10% 90% 90% VCC VOH VOL 0 V tr tf Input In-Phase Output 50% tPLH tPHL 50% 50% 10% 10% 90% 90% VOH VOL tr tf tPHL tPLH Out-of-Phase Output Test Point From Output Under Test CL (see Note A) 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. Figure 1. Load Circuit and Voltage Waveforms |
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