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SY55853U Datasheet(PDF) 3 Page - Micrel Semiconductor |
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SY55853U Datasheet(HTML) 3 Page - Micrel Semiconductor |
3 / 7 page 3 SuperLite™ SY55853U Micrel, Inc. M9999-110705 hbwhelp@micrel.com or (408) 955-1690 FUNCTIONAL DESCRIPTION VCC NC X /X Figure 1. Hard Wiring A Logic “1” (1) Note 1. X is either D, LE, R input. /X is either /D, /LE, /R input. NC NC VCC > 3.0V X /X NC VCC ≤ 3.0V VCC X /X Figure 2. Hard Wiring A Logic “0” (1) Establishing Static Logic Inputs The true pin of an input pair is internally biased to ground through a 75k Ω resistor. The complement pin of an input pair is internally biased halfway between V CC and ground by a voltage divider consisting of two 75k Ω resistors. To keep an input at static logic zero at V CC > 3.0V, leave both inputs unconnected. For V CC ≤ 3.0V, connect the complement input to V CC and leave the true input unconnected. To make an input static logic one, connect the true input to V CC, leave the complement input unconnected. These are the only ;safe ways to cause inputs to be at a static value. In particular, no input pin should be directly connected to ground. All NC (no connect) pins should be unconnected. |
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