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SN74HCT257N Datasheet(PDF) 4 Page - Texas Instruments |
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SN74HCT257N Datasheet(HTML) 4 Page - Texas Instruments |
4 / 8 page SN54HCT257, SN74HCT257 QUADRUPLE 2LINE TO 1LINE DATA SELECTORS/MULTIPLEXERS WITH 3STATE OUTPUTS SCLS072D − NOVEMBER 1988 − REVISED SEPTEMBER 2003 4 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 switching characteristics over recommended operating free-air temperature range, CL = 50 pF (unless otherwise noted) (see Figure 1) PARAMETER FROM TO VCC TA = 25°C SN54HCT257 SN74HCT257 UNIT PARAMETER FROM (INPUT) TO (OUTPUT) VCC MIN TYP MAX MIN MAX MIN MAX UNIT A or B Y 4.5 V 20 30 45 38 tpd A or B Y 5.5 V 17 27 40 34 ns tpd A/B Y 4.5 V 20 30 45 38 ns A/B Y 5.5 V 17 27 40 34 ten OE Y 4.5 V 20 30 45 38 ns ten OE Y 5.5 V 17 27 40 34 ns tdis OE Y 4.5 V 20 30 45 38 ns tdis OE Y 5.5 V 17 27 40 34 ns tt Any 4.5 V 8 15 22 19 ns tt Any 5.5 V 7 14 21 17 ns 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 SN54HCT257 SN74HCT257 UNIT PARAMETER FROM (INPUT) TO (OUTPUT) VCC MIN TYP MAX MIN MAX MIN MAX UNIT A or B Y 4.5 V 22 38 57 48 tpd A or B Y 5.5 V 19 35 53 44 ns tpd A/B Y 4.5 V 22 38 57 48 ns A/B Y 5.5 V 19 35 53 44 ten OE Y 4.5 V 23 40 60 50 ns ten OE Y 5.5 V 20 38 57 48 ns tt Any 4.5 V 17 42 63 53 ns tt Any 5.5 V 14 38 57 48 ns operating characteristics, TA = 25°C PARAMETER TEST CONDITIONS TYP UNIT Cpd Power dissipation capacitance No load 13 pF PRODUCT PREVIEW information concerns products in the formative or design phase of development. Characteristic data and other specifications are design goals. Texas Instruments reserves the right to change or discontinue these products without notice. |
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