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SN74ALS638A Datasheet(PDF) 5 Page - Texas Instruments |
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SN74ALS638A Datasheet(HTML) 5 Page - Texas Instruments |
5 / 16 page SN74ALS638A, SN74ALS639A, SN74AS638A, SN74AS639 OCTAL BUS TRANSCEIVERS SDAS123A – DECEMBER 1983 – REVISED JANUARY 1995 5 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 electrical characteristics over recommended operating free-air temperature range (unless otherwise noted) PARAMETER TEST CONDITIONS SN74AS638A SN74AS639 UNIT MIN TYP† MAX VIK VCC = 4.5 V, II = – 18 mA – 1.2 V IOH A ports VCC = 4.5 V, VOH = 5.5 V 0.1 mA VCC = 4.5 V to 5.5 V, IOH = – 2 mA VCC –2 VOH B ports VCC =4 5V IOH = – 3 mA 2.4 3.2 V VCC = 4.5 V IOH = – 15 mA 2.4 VOL A or B ports VCC = 4.5 V, IOL = 64 mA 0.35 0.55 V 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 70 µA IIL Control inputs VCC =5 5V VI =0 4V – 0.5 mA IIL A or B ports‡ VCC = 5.5 V, VI = 0.4 V – 0.75 mA IO§ VCC = 5.5 V, VO = 2.25 V –50 – 150 mA Outputs high 24 54 SN74AS638A VCC = 5.5 V Outputs low 75 122 ICC Outputs disabled 37 61 mA ICC Outputs high 56 92 mA SN74AS639 VCC = 5.5 V Outputs low 95 154 Outputs disabled 62 100 † 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. switching characteristics (see Figure 1) PARAMETER FROM (INPUT) TO (OUTPUT) VCC = 4.5 V to 5.5 V, CL = 50 pF, RL = 500 Ω (A outputs), R1 = R2 = 500 Ω (B outputs), TA = MIN to MAX¶ UNIT SN74AS638A SN74AS639 MIN MAX MIN MAX tPLH A B 2 7 2 9.5 ns tPHL A B 2 6.5 2 9 ns tPLH B A 5 20 5 22 ns tPHL B A 2 7 2 9 ns tPLH OE A 5 19 5 21.5 ns tPHL OE A 2 9 2 11.5 ns tPZH OE B 2 8 2 10.5 ns tPZL OE B 2 10 2 10.5 ns tPHZ OE B 2 7 2 7 ns tPLZ OE B 2 10 2 10.5 ns ¶ For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions. |
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Similar Description - SN74ALS638A_16 |
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