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SN74HCT245PW Scheda tecnica(PDF) 3 Page - Texas Instruments |
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SN74HCT245PW Scheda tecnica(HTML) 3 Page - Texas Instruments |
3 / 18 page SN54HCT245, SN74HCT245 OCTAL BUS TRANSCEIVERS WITH 3-STATE OUTPUTS SCLS020E – MARCH 1984 – REVISED AUGUST 2003 3 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 recommended operating conditions (see Note 3) SN54HCT245 SN74HCT245 UNIT MIN NOM MAX MIN NOM MAX UNIT VCC Supply voltage 4.5 5 5.5 4.5 5 5.5 V VIH High-level input voltage VCC = 4.5 V to 5.5 V 2 2 V VIL Low-level input voltage VCC = 4.5 V to 5.5 V 0.8 0.8 V VI Input voltage 0 VCC 0 VCC V VO Output voltage 0 VCC 0 VCC V ∆t/∆v Input transition rise/fall time 500 500 ns TA Operating free-air temperature –55 125 –40 85 °C NOTE 3: All unused inputs of the device must be held at VCC or GND to ensure proper device operation. Refer to the TI application report, Implications of Slow or Floating CMOS Inputs, literature number SCBA004. electrical characteristics over recommended operating free-air temperature range (unless otherwise noted) PARAMETER TEST CONDITIONS VCC TA = 25°C SN54HCT245 SN74HCT245 UNIT PARAMETER TEST CONDITIONS VCC MIN TYP MAX MIN MAX MIN MAX UNIT VOH VI = VIH or VIL IOH = –20 µA 4.5 V 4.4 4.499 4.4 4.4 V VOH VI = VIH or VIL IOH = –6 mA 4.5 V 3.98 4.3 3.7 3.84 V VOL VI = VIH or VIL IOL = 20 µA 4.5 V 0.001 0.1 0.1 0.1 V VOL VI = VIH or VIL IOL = 6 mA 4.5 V 0.17 0.26 0.4 0.33 V II DIR or OE VI = VCC or 0 5.5 V ±0.1 ±100 ±1000 ±1000 nA IOZ A or B VO = VCC or 0 5.5 V ±0.01 ±0.5 ±10 ±5 µA ICC VI = VCC or 0, IO = 0 5.5 V 8 160 80 µA ∆ICC† One input at 0.5 V or 2.4 V, Other inputs at 0 or VCC 5.5 V 1.4 2.4 3 2.9 mA Ci‡ DIR or OE 4.5 V to 5.5 V 3 10 10 10 pF † This is the increase in supply current for each input that is at one of the specified TTL voltage levels, rather than 0 V or VCC. ‡ Parameter Ci does not apply to transceiver I/O ports. 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 SN54HCT245 SN74HCT245 UNIT PARAMETER FROM (INPUT) TO (OUTPUT) VCC MIN TYP MAX MIN MAX MIN MAX UNIT tpd A or B B or A 4.5 V 16 22 33 28 ns tpd A or B B or A 5.5 V 14 20 30 25 ns ten OE A or B 4.5 V 25 46 69 58 ns ten OE A or B 5.5 V 22 41 62 52 ns tdis OE A or B 4.5 V 26 40 60 50 ns tdis OE A or B 5.5 V 23 36 54 45 ns tt A or B 4.5 V 9 12 18 15 ns tt A or B 5.5 V 8 11 16 14 ns |
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