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SN74ALS990 Datasheet(PDF) 3 Page - Texas Instruments |
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SN74ALS990 Datasheet(HTML) 3 Page - Texas Instruments |
3 / 14 page SN74ALS990 8-BIT D-TYPE TRANSPARENT READ-BACK LATCH SDAS027B – APRIL 1984 – REVISED JANUARY 1995 3 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 recommended operating conditions 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 Q – 2.6 mA IOH High-level output current D – 0.4 mA IOL Low level output current Q 24 mA IOL Low-level output current D 8 mA tw Pulse duration, LE high 10 ns t Setup time Data before LE ↓ 10 ns tsu Setup time Data before OERB ↓ 10 ns th Hold time, data after LE ↓ 5 ns TA Operating free-air temperature 0 70 °C electrical characteristics over recommended operating free-air temperature range (unless otherwise noted) PARAMETER TEST CONDITIONS MIN TYP† MAX UNIT VIK VCC = 4.5 V, II = – 18 mA – 1.2 V V All outputs VCC = 4.5 V to 5.5 V, IOH = – 0.4 mA VCC –2 V VOH Q VCC = 4.5 V, IOH = – 2.6 mA 2.4 3.2 V D VCC =4 5V IOL = 4 mA 0.25 0.4 VOL D VCC = 4.5 V IOL = 8 mA 0.35 0.5 V VOL Q VCC =4 5V IOL = 12 mA 0.25 0.4 V Q VCC = 4.5 V IOL = 24 mA 0.35 0.5 II OERB, LE VCC =5 5V VI = 5.5 V 0.1 mA II D inputs VCC = 5.5 V VI = 7 V 0.1 mA I OERB, LE VCC =5 5V VI =2 7V 20 µA IIH D inputs‡ VCC = 5.5 V, VI = 2.7 V 20 µA IIL OERB, LE VCC =5 5V VI =0 4V – 0.1 mA IIL D inputs‡ VCC = 5.5 V, VI = 0.4 V – 0.1 mA IO§ VCC = 5.5 V, VO = 2.25 V –30 –112 mA ICC VCC = 5.5 V, Outputs high 27 50 mA ICC CC OERB high Outputs low 40 70 mA † All typical values are at VCC = 5 V, TA = 25°C. ‡ For I/O ports (QA thru QH), the parameters IIH and IIL include the off-state output current. § The output conditions have been chosen to produce a current that closely approximates one half of the true short-circuit output current, IOS. |
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