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CD74HCT646M96 Datasheet(PDF) 7 Page - Texas Instruments |
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CD74HCT646M96 Datasheet(HTML) 7 Page - Texas Instruments |
7 / 18 page CD54HC646, CD74HCT646 OCTAL BUS TRANSCEIVERS AND REGISTERS WITH 3-STATE OUTPUTS SCHS278B – APRIL 2003 – REVISED APRIL 2003 7 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 HCT INPUT LOADING TABLE INPUT UNIT LOAD† OE 1.3 DIR 0.75 CLKAB or CLKBA 0.6 SAB or SBA 0.45 A or B 0.3 † Unit Load is ∆ICC limit specified in electrical characteristics table (e.g., 360 µA max at 25°C). timing requirements for CD54HC646 over recommended operating free-air temperature range (unless otherwise noted) (see Figure 2) VCC TA = 25°C TA = –55°C TO 125 °C TA = –40°C TO 85 °C UNIT CC MIN MAX MIN MAX MIN MAX 2 V 6 4 5 fclock Clock frequency 4.5 V 30 20 25 MHz 6 V 35 23 29 2 V 80 120 100 tw Pulse duration, CLKBA or CLKAB high or low 4.5 V 16 24 20 ns 6 V 14 20 17 ↑ ↑ 2 V 60 90 75 tsu Setup time, A before CLKAB ↑ or B before CLKBA↑ 4.5 V 12 18 15 ns 6 V 10 15 13 ↑ ↑ 2 V 35 55 45 th Hold time, A after CLKAB ↑ or B after CLKBA↑ 4.5 V 7 11 9 ns 6 V 6 9 8 timing requirements for CD74HCT646 over recommended operating free-air temperature range, VCC = 4.5 V (unless otherwise noted) (see Figure 3) TA = 25°C TA = –55°C TO 125 °C TA = –40°C TO 85 °C UNIT MIN MAX MIN MAX MIN MAX fclock Clock frequency 25 17 20 MHz tw Pulse duration, CLKBA or CLKAB high or low 25 38 31 ns tsu Setup time, A before CLKAB ↑ or B before CLKBA↑ 12 18 15 ns th Hold time, A after CLKAB ↑ or B after CLKBA↑ 5 5 5 ns |
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