The MC10SX1130 is high speed LED Driver/current switch specifically targeted for use in FDDI PMD and ANSI X3T9.3 FibreChannel 266 Mbits/s optical transmitters. The integrated circuit contains several unique functional blocks which makes it easily configurable for use with a variety of high performance LED devices. The part is fabricated using MOSAIC IIITM bipolar process. The logic is designed so that a data HIGH input results in the modulation current flowing through the IOUT pin to turn on the LED. The device incorporates open collector outputs with a capability of driving peak currents of 100 mA. Since the output current switching circuitry simply switches current between the complementary outputs, the dynamic switching demands on the system power supply are greatly reduced. In addition, because the design is pure bipolar, the device current drain is insensitive to the data pattern and frequency of operation.