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SN54HCT646JT Datasheet(PDF) 6 Page - Texas Instruments |
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SN54HCT646JT Datasheet(HTML) 6 Page - Texas Instruments |
6 / 8 page SN54HCT646, SN74HCT646 OCTAL BUS TRANSCEIVERS AND REGISTERS WITH 3-STATE OUTPUTS SCLS178B – MARCH 1984 – REVISED MAY 1997 6 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 switching characteristics over recommended operating free-air temperature range, CL = 50 pF (unless otherwise noted) (see Figure 2) PARAMETER FROM TO VCC TA = 25°C SN54HCT646 SN74HCT646 UNIT PARAMETER (INPUT) (OUTPUT) VCC MIN TYP MAX MIN MAX MIN MAX UNIT f 4.5 V 31 54 22 27 MHz fmax 5.5 V 36 64 24 29 MHz CLKBA or CLKAB AorB 4.5 V 18 36 54 45 CLKBA or CLKAB A or B 5.5 V 16 32 49 41 t d AorB BorA 4.5 V 14 27 41 34 ns tpd A or B B or A 5.5 V 12 24 37 31 ns SBA or SAB† AorB 4.5 V 20 38 57 48 SBA or SAB† A or B 5.5 V 17 34 51 43 t OE AorB 4.5 V 25 49 74 61 ns ten OE A or B 5.5 V 22 44 67 55 ns tdi OE AorB 4.5 V 25 49 74 61 ns tdis OE A or B 5.5 V 22 44 67 55 ns t DIR AorB 4.5 V 25 49 74 61 ns ten DIR A or B 5.5 V 22 44 67 55 ns tdi DIR AorB 4.5 V 25 49 74 61 ns tdis DIR A or B 5.5 V 22 44 67 55 ns tt Any 4.5 V 9 12 18 15 ns tt Any 5.5 V 7 11 16 14 ns † These parameters are measured with the internal output state of the storage register opposite that of the bus input. switching characteristics over recommended operating free-air temperature range, CL = 150 pF (unless otherwise noted) (see Figure 2) PARAMETER FROM TO VCC TA = 25°C SN54HCT646 SN74HCT646 UNIT PARAMETER (INPUT) (OUTPUT) VCC MIN TYP MAX MIN MAX MIN MAX UNIT CLKBA or CLKAB AorB 4.5 V 24 53 80 66 CLKBA or CLKAB A or B 5.5 V 22 47 52 60 t d AorB BorA 4.5 V 22 44 67 55 ns tpd A or B B or A 5.5 V 20 39 60 50 ns SBA or SAB† AorB 4.5 V 26 55 83 69 SBA or SAB† A or B 5.5 V 24 49 74 62 OE AorB 4.5 V 33 66 100 87 t OE A or B 5.5 V 22 59 90 74 ns ten DIR AorB 4.5 V 33 66 100 87 ns DIR A or B 5.5 V 22 59 90 74 tt Any 4.5 V 17 42 63 53 ns tt Any 5.5 V 14 38 57 48 ns † These parameters are measured with the internal output state of the storage register opposite that of the bus input. operating characteristics, TA = 25°C PARAMETER TEST CONDITIONS TYP UNIT Cpd Power dissipation capacitance No load 50 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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