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FXMAR2104UMX Datasheet(PDF) 7 Page - Fairchild Semiconductor |
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FXMAR2104UMX Datasheet(HTML) 7 Page - Fairchild Semiconductor |
7 / 15 page © 2011 Fairchild Semiconductor Corporation www.fairchildsemi.com FXMAR2104 • Rev. 1.0.1 7 VOL vs. IOL The I 2C specification mandates a maximum V IL (IOL of 3mA) of VCC • 0.3 and a maximum VOL of 0.4V. If there is a master on the A port of an I 2C translator with a V CC of 1.65V and a slave on the I 2C translator B port with a VCC of 3.3V, the maximum VIL of the master is (1.65V x 0.3) 495mV. The slave could legally transmit a valid logic LOW of 0.4V to the master. If the I 2C translator’s channel resistance is too high, the voltage drop across the translator could present a VIL to the master greater than 495mV. To complicate matters, the I 2C specification states that 6mA of I OL is recommended for bus capacitances approaching 400pF. More IOL increases the voltage drop across the I 2C translator. The I2C application benefits when I2C translators exhibit low VOL performance. Figure 5 depicts typical FXMAR2104 VOL performance vs. a competitor, given a 0.4V VIL. Figure 5. VOL vs. IOL |
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