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SN74AS257N Datasheet(PDF) 4 Page - Texas Instruments |
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SN74AS257N Datasheet(HTML) 4 Page - Texas Instruments |
4 / 20 page SN54ALS257A, SN54ALS258A, SN74ALS257A, SN74ALS258A, SN74AS257, SN74AS258 QUADRUPLE 2LINE TO 1LINE DATA SELECTORS/MULTIPLEXERS WITH 3STATE OUTPUTS SDAS124C − APRIL 1982 − REVISED AUGUST 1996 4 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 POST OFFICE BOX 1443 • HOUSTON, TEXAS 77251−1443 electrical characteristics over recommended operating free-air temperature range (unless otherwise noted) PARAMETER TEST CONDITIONS SN54ALS257A SN54ALS258A SN74ALS257A SN74ALS258A UNIT PARAMETER TEST CONDITIONS MIN TYP† MAX MIN TYP† MAX UNIT VIK VCC = 4.5 V, II = −18 mA −1.5 −1.5 V VCC = 4.5 V to 5.5 V, IOH = −0.4 mA VCC−2 VCC−2 VOH VCC = 4.5 V IOH = −1 mA 2.4 3.3 V VOH VCC = 4.5 V IOH = −2.6 mA 2.4 3.2 V VOH VCC = 4.5 V IOL = 12 mA 0.25 0.4 0.25 0.4 V VOH VCC = 4.5 V IOL = 24 mA 0.35 0.5 V IOZH VCC = 5.5 V, VO = 2.7 V 20 20 µA IOZL VCC = 5.5 V, VO = 0.4 V −20 −20 µA II VCC = 5.5 V, VI = 7 V 0.1 0.1 mA IIH VCC = 5.5 V, VI = 2.7 V 20 20 µA IIL VCC = 5.5 V, VI = 0.4 V −0.1 −0.1 mA IO‡ VCC = 5.5 V, VO = 2.25 V −20 −112 −30 −112 mA SN54ALS257A, Outputs high 3 8 3 6 SN54ALS257A, SN74ALS257A VCC = 5.5 V Outputs low 8 12 8 12 ICC SN74ALS257A VCC = 5.5 V Outputs disabled 9 14 9 14 mA ICC SN54ALS258A, Outputs high 2.5 5 2.5 4 mA SN54ALS258A, SN74ALS258A VCC = 5.5 V Outputs low 7 11 7 11 SN74ALS258A VCC = 5.5 V Outputs disabled 8 13 8 13 † All typical values are at VCC = 5 V, TA = 25°C. ‡ The output conditions have been chosen to produce a current that closely approximates one half of the true short-circuit output current, IOS. switching characteristics (see Figure 1) PARAMETER FROM (INPUT) TO (OUTPUT) VCC = 4.5 V to 5.5 V, CL = 50 pF, R1 = 500 Ω, R2 = 500 Ω, TA = MIN to MAX§ UNIT (INPUT) (OUTPUT) SN54ALS257A SN74ALS257A MIN MAX MIN MAX tPLH A or B Any Y 2 12 2 10 ns tPHL A or B Any Y 2 14 2 12 ns tPLH A /B Any Y 4 21 6 18 ns tPHL A /B Any Y 6 25 6 22 ns tPZH OE Any Y 3 20 4 16 ns tPZL OE Any Y 4 22 5 18 ns tPHZ OE Any Y 2 12 2 10 ns tPLZ OE Any Y 2 35 4 15 ns § For conditions shown MIN or MAX, use the appropriate value specified under recommended operating conditions. |
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