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SY89540U Datasheet(PDF) 5 Page - Micrel Semiconductor |
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SY89540U Datasheet(HTML) 5 Page - Micrel Semiconductor |
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5 / 14 page  Micrel, Inc. SY89540U December 2007 M9999-120607-C hbwhelp@micrel.com or (408) 955-1690 5 Functional Description Buffer Mode SY89540 can be used as a 1:4 fanout buffer. This is the default mode with LOAD and CONFIG being HIGH when the device is first powered up. The SIN0 and SIN1 inputs select the input signal that will be buffered. Regardless of the output switch selection, the input signal will be buffered to all four outputs. Crosspoint Mode SY89540 can be programmed to take differential input signals from any input and buffer the signals to one or more outputs. Prior to configuring SIN and SOUT, LOAD and CONFIG must be LOW. To program the desired I/O combination, follow the following sequence: 1) Select the desired input with the SIN0 and SIN1 inputs and the output with the SOUT0 and SOUT1. 2) Pulse the LOAD with a positive pulse to load SIN and SOUT. 3) Pulse the CONFIG pin with a positive pulse to latched the I/O configuration. 4) This method can be used to create independent paths between inputs and outputs. Below is the truth table to create a 4:4 buffer where IN0 -> Q3, IN1 -> Q2, IN2 -> Q1, and IN3 -> Q0: The SY89540 can be switched from crosspoint mode to a 1:4 fanout buffer simply by providing a LOW-to- HIGH pulse to the LOAD and CONFIG pins. The input configuration (SIN0:1) will select the desired input signal while the output switch will buffer the selected input signal. To get the same desired input to all four outputs (1:4), LOAD and CONFIG must be repeated four times to cover all outputs (i.e., SOUT0:1 must go through all four output combinations, repeated by LOAD and CONFIG). Input SIN1 SIN0 SOUT1 SOUT0 Load Config. Output 0 IN0 0 0 1 1 0 Q3 0 IN1 0 1 1 0 0 Q2 0 IN2 1 0 0 1 0 Q1 0 IN3 1 1 0 0 0 Q0 Table 1. 4:4 Buffer Truth Table |
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