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SN74ALS232BFN Scheda tecnica(PDF) 5 Page - Texas Instruments |
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SN74ALS232BFN Scheda tecnica(HTML) 5 Page - Texas Instruments |
5 / 8 page SN74ALS232B 16 × 4 ASYNCHRONOUS FIRST-IN, FIRST-OUT MEMORY SCAS251B – FEBRUARY 1989 – REVISED APRIL 1998 5 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 recommended operating conditions (see Note 3) 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 outputs –2.6 mA IOH High-level output current FULL, EMPTY –0.4 mA IOL Low level output current Q outputs 24 mA IOL Low-level output current FULL, EMPTY 8 mA TA Operating free-air temperature 0 70 °C NOTE 3: To ensure proper operation of this high-speed FIFO device, it is necessary to provide a clean signal to the LDCK and UNCK clock inputs. Any excessive noise or glitching on the clock inputs that violates limits for maximum VIL, minimum VIH, or minimum pulse duration can cause a false clock or improper operation of the internal read and write pointers. 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 VOH Q outputs VCC = 4.5 V, IOH = –2.6 mA 2.4 3.2 V VOH FULL, EMPTY VCC = 4.5 V to 5.5 V, IOH = –0.4 mA VCC–2 V Q outputs VCC =4 5V IOL = 12 mA 0.25 0.4 VOL Q outputs VCC = 4.5 V IOL = 24 mA 0.35 0.5 V VOL FULL EMPTY VCC =4 5V IOL = 4 mA 0.25 0.4 V FULL, EMPTY VCC = 4.5 V IOL = 8 mA 0.35 0.5 IOZH VCC = 5.5 V, VO = 2.7 V 20 µA IOZL VCC = 5.5 V, VO = 0.4 V –20 µA II VCC = 5.5 V, VI = 7 V 0.1 mA IIH VCC = 5.5 V, VI = 2.7 V 20 µA IIL VCC = 5.5 V, VI = 0.4 V –0.2 mA IO‡ VCC = 5.5 V, VO = 2.25 V –30 –112 mA ICC VCC = 5.5 V 80 125 mA † All typical values are at VCC = 5 V, TA = 25°C. ‡ 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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