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SN74ALS257A Datasheet(PDF) 5 Page - Texas Instruments |
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SN74ALS257A Datasheet(HTML) 5 Page - Texas Instruments |
5 / 20 page SN54ALS257A, SN54ALS258A, SN74ALS257A, SN74ALS258A, SN74AS257, SN74AS258 QUADRUPLE 2LINE TO 1LINE DATA SELECTORS/MULTIPLEXERS WITH 3STATE OUTPUTS SDAS124C − APRIL 1982 − REVISED AUGUST 1996 5 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 POST OFFICE BOX 1443 • HOUSTON, TEXAS 77251−1443 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) SN54ALS258A SN74ALS258A MIN MAX MIN MAX tPLH A or B Any Y 1 12 2 8 ns tPHL A or B Any Y 2 9 2 7 ns tPLH A /B Any Y 4 28 5 25 ns tPHL A /B Any Y 5 25 6 20 ns tPZH OE Any Y 3 20 4 18 ns tPZL OE Any Y 5 21 5 18 ns tPHZ OE Any Y 2 12 2 10 ns tPLZ OE Any Y 3 37 4 18 ns † For conditions shown MIN or MAX, use the appropriate value specified under recommended operating conditions. absolute maximum ratings over operating free-air temperature range (unless otherwise noted)‡ Supply voltage, VCC 7 V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Input voltage, VI 7 V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Voltage applied to a disabled 3-state output 5.5 V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Maximum power dissipation at TA = 55°C (in still air) (see Note 1): D package 1.3 W . . . . . . . . . . . . . . . . . . . N package 1.1 W . . . . . . . . . . . . . . . . . . . Operating free-air temperature range, TA: SN74AS257, SN74AS258 0 °C to 70°C . . . . . . . . . . . . . . . . . . . . . . Storage temperature range, Tstg −65 °C to 150°C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ‡ Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability. NOTE 1: The maximum package power dissipation is calculated using a junction temperature of 150 °C and a board trace length of 750 mils, except for the N package, which has a trace length of zero. recommended operating conditions SN74AS257 SN74AS258 UNIT MIN NOM MAX UNIT VCC Supply voltage 4.5 5 5.5 V VIH High-level input voltage 2 V VIL Low-level input voltage 0.8 V IOH High-level output current −15 mA IOL Low-level output current 48 mA TA Operating free-air temperature 0 70 °C |
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