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SN74ALS638A Scheda tecnica(PDF) 3 Page - Texas Instruments |
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SN74ALS638A Scheda tecnica(HTML) 3 Page - Texas Instruments |
3 / 16 page SN74ALS638A, SN74ALS639A, SN74AS638A, SN74AS639 OCTAL BUS TRANSCEIVERS SDAS123A – DECEMBER 1983 – REVISED JANUARY 1995 3 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 recommended operating conditions SN74ALS638A SN74ALS639A UNIT MIN NOM MAX VCC Supply voltage 4.5 5 5.5 V VIH High-level input voltage 2 V VIL Low-level input voltage 0.8 V VOH High-level output voltage A ports 5.5 V IOH High-level output current B ports –15 mA IOL Low level output current AorB ports 24 mA IOL Low-level output current A or B ports 48† mA TA Operating free-air temperature 0 70 °C † Applies only to the SN74ALS638A-1 version and only if VCC is between 4.75 V and 5.25 V electrical characteristics over recommended operating free-air temperature range (unless otherwise noted) PARAMETER TEST CONDITIONS SN74ALS638A SN74ALS639A UNIT MIN TYP‡ MAX VIK VCC = 4.5 V, II = – 18 mA – 1.5 V IOH A ports VCC = 4.5 V, VOH = 5.5 V 0.1 mA VCC = 4.5 V to 5.5 V, IOH = – 0.4 mA VCC –2 VOH B ports VCC =4 5V IOH = – 3 mA 2.4 3.2 V VCC = 4.5 V IOH = – 15 mA 2 IOL = 12 mA 0.25 0.4 VOL A or B ports VCC = 4.5 V IOL = 24 mA 0.35 0.5 V IOL = 48 mA† 0.35 0.5 II Control inputs VCC =5 5V VI = 7 V 0.1 mA II A or B ports VCC = 5.5 V VI = 5.5 V 0.1 mA IIH Control inputs VCC =5 5V VI =2 7V 20 µA IIH A or B ports§ VCC = 5.5 V, VI = 2.7 V 20 µA IIL Control inputs VCC =5 5V VI =0 4V – 0.1 mA IIL A or B ports§ VCC = 5.5 V, VI = 0.4 V – 0.1 mA IO¶ B ports VCC = 5.5 V, VO = 2.25 V –30 –112 mA Outputs high 18 30 SN74ALS638A VCC = 5.5 V Outputs low 26 41 ICC Outputs disabled 16 30 mA ICC Outputs high 25 40 mA SN74ALS639A VCC = 5.5 V Outputs low 30 50 Outputs disabled 33 54 † Applies only to the SN74ALS638A-1 version and only if VCC is between 4.75 V and 5.25 V ‡ All typical values are at VCC = 5 V, TA = 25°C. § For I/O ports, 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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