SY100EL91L

The SY100EL91L is a triple LVPECL-to-ECL or LVPECL-to-LVECL translator.

A V_BB output of SY100EL91L is provided for interfacing with single ended PECL signals at the input. If a single ended input is to be used, the V_BB output should be connected to the D input. The active signal would then drive the D input. When used, the V_BB output should be bypassed to ground via a 0.01F capacitor. The V_BB output is designed to act as the switching reference for the EL91L under single ended input switching conditions. As a result this pin can only source/sink up to 0.5mA of current.

To accomplish the level translation the SY100EL91L requires three power rails. The V_CC supply should be connected to the positive supply, and the VEE pin should be connected to the negative power supply. The GND pins as expected are connected to the system ground plane. Both VEE and V_CC should be bypassed to ground via 0.01F capacitors.

Under open input conditions, the D input of SY100EL91L will be biased at V_CC/2 and the D input will be pulled to GND. This condition will force the Q output to a LOW, ensuring stability.