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SN74ALS640BDWRE4 Scheda tecnica(PDF) 3 Page - Texas Instruments |
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SN74ALS640BDWRE4 Scheda tecnica(HTML) 3 Page - Texas Instruments |
3 / 20 page SN54ALS640B, SN54AS640, SN74ALS640B, SN74AS640 OCTAL BUS TRANSCEIVERS WITH 3-STATE OUTPUTS SDAS122A – DECEMBER 1983 – REVISED JANUARY 1995 3 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 electrical characteristics over recommended operating free-air temperature range (unless otherwise noted) PARAMETER TEST CONDITIONS SN54ALS640B SN74ALS640B 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 IOH = – 3 mA 2.4 3.2 2.4 3.2 V VOH VCC = 4.5 V IOH = – 12 mA 2 V IOH = – 15 mA 2 IOL = 12 mA 0.25 0.4 0.25 0.4 VOL 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 0.1 mA II A or B ports VCC = 5.5 V VI = 5.5 V 0.1 0.1 mA IIH Control inputs VCC =5 5V VI =2 7V 20 20 µA IIH A or B ports§ VCC = 5.5 V, VI = 2.7 V 20 20 µA IIL Control inputs VCC =5 5V VI =0 4V – 0.1 – 0.1 mA IIL A or B ports§ 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 Outputs high 19 50 19 45 ICC VCC = 5.5 V Outputs low 27 60 27 55 mA Outputs disabled 28 55 28 50 † All typical values are at VCC = 5 V, TA = 25°C. ‡ Applies only to the -1 version and only if VCC is between 4.75 V and 5.25 V § 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, R1 = 500 Ω, R2 = 500 Ω, TA = MIN to MAX# UNIT SN54ALS640B SN74ALS640B MIN MAX MIN MAX tPLH AorB BorA 2 14 2 11 ns tPHL A or B B or A 2 13 2 10 ns tPZH OE AorB 4 25 4 21 ns tPZL OE A or B 5 27 5 24 ns tPHZ OE AorB 2 12 2 10 ns tPLZ OE A or B 3 20 3 15 ns # For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions. |
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