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SN74HCT138DE4 데이터시트(PDF) 4 Page - Texas Instruments |
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SN74HCT138DE4 데이터시트(HTML) 4 Page - Texas Instruments |
4 / 20 page SN54HCT138, SN74HCT138 3LINE TO 8LINE DECODERS/DEMULTIPLEXERS SCLS171E − MARCH 1984 − REVISED SEPTEMBER 2003 4 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 recommended operating conditions (see Note 3) SN54HCT138 SN74HCT138 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 SN54HCT138 SN74HCT138 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 = −4 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 = 4 mA 4.5 V 0.17 0.26 0.4 0.33 V II VI = VCC or 0 5.5 V ±0.1 ±100 ±1000 ±1000 nA 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 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. 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 SN54HCT138 SN74HCT138 UNIT PARAMETER FROM (INPUT) TO (OUTPUT) VCC MIN TYP MAX MIN MAX MIN MAX UNIT A, B, or C Any Y 4.5 V 23 36 54 45 tpd A, B, or C Any Y 5.5 V 17 32 49 34 ns tpd Enable Any Y 4.5 V 22 33 50 42 ns Enable Any Y 5.5 V 18 30 45 38 tt Y 4.5 V 12 15 22 19 ns tt Y 5.5 V 11 14 20 17 ns operating characteristics, TA = 25°C PARAMETER TEST CONDITIONS TYP UNIT Cpd Power dissipation capacitance No load 85 pF |
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