DS36C278

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SNLS096C – JULY 1998 – REVISED APRIL 2013

First, for a ½ UL device the top and bottom borders shown in Figure 19 are scaled. Both 0 mA reference points

at +5V and

−3V stay the same. The other reference points are +12V at +0.5 mA for the top border and −7V at

−0.4 mA for the bottom border (see Figure 19). Second, for a ¼ UL device the top and bottom borders shown in

Figure 19 are scaled also. Again, both 0 mA reference points at +5V and

−3V stay the same. The other

reference points are +12V at +0.25 mA for the top border and

−7V at −0.2 mA for the bottom border (see

Figure 19).

The advantage of the ½ UL and ¼ UL devices is the increased number of nodes on one bus. In a single master

multi-slave type of application where the number of slaves exceeds 32, the DS36C278/279/280 may save in the

cost of extra devices like repeaters, extra media like cable, and/or extra components like resistors.

The DS36C279 and DS36C280 have an additional feature which offers more advantages. The DS36C279 has

an automatic sleep mode function for power conscious applications. The DS36C280 has a slew rate control for

EMI conscious applications. Refer to the sleep mode and slew rate control portion of the application information

section in the corresponding datasheet for more information on these features.

Figure 19. Input Current vs Input Voltage Operating Range

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