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SN74AVCH2T45DCTR Scheda tecnica(PDF) 9 Page - Texas Instruments |
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SN74AVCH2T45DCTR Scheda tecnica(HTML) 9 Page - Texas Instruments |
9 / 23 page www.ti.com Operating Characteristics POWER-UP CONSIDERATIONS SN74AVCH2T45 DUAL-BIT DUAL-SUPPLY BUS TRANSCEIVER WITH CONFIGURABLE VOLTAGE TRANSLATION AND 3-STATE OUTPUTS SCES582D – JULY 2004 – REVISED AUGUST 2005 T A = 25°C VCCA = VCCA = VCCA = VCCA = VCCA = TEST VCCB = 1.2 V VCCB = 1.5 V VCCB = 1.8 V VCCB = 2.5 V VCCB = 3.3 V PARAMETER UNIT CONDITIONS TYP TYP TYP TYP TYP A-port input, 3 3 3 3 4 CL = 0, B-port output CpdA(1) f = 10 MHz, pF B-port input, tr = tf = 1 ns 13 13 14 15 15 A-port output A-port input, 13 13 14 15 15 CL = 0, B-port output CpdB(1) f = 10 MHz, pF B-port input, tr = tf = 1 ns 3 3 3 3 4 A-port output (1) Power dissipation capacitance per transceiver A proper power-up sequence always should be followed to avoid excessive supply current, bus contention, oscillations, or other anomalies. To guard against such power-up problems, take the following precautions: 1. Connect ground before any supply voltage is applied. 2. Power up VCCA. 3. VCCB can be ramped up along with or after VCCA. Table 1. Typical Total Static Power Consumption (ICCA + ICCB) VCCA VCCB UNIT 0 V 1.2 V 1.5 V 1.8 V 2.5 V 3.3 V 0 V 0 <0.5 <0.5 <0.5 <0.5 <0.5 1.2 V <0.5 <1 <1 <1 <1 1 1.5 V <0.5 <1 <1 <1 <1 1 µA 1.8 V <0.5 <1 <1 <1 <1 <1 2.5 V <0.5 1 <1 <1 <1 <1 3.3 V <0.5 1 <1 <1 <1 <1 9 |
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