SC16C554B/554DB - 5 V, 3.3 V and 2.5 V quad UART, 5 Mbit/s (max.) with 16-byte FIFOs QFP 80-Pin
SC16C754B - 5 V, 3.3 V and 2.5 V quad UART, 5 Mbit/s (max.) with 64-byte FIFOs QFP 80-Pin
SC16C554_554D - Quad UART with 16-byte FIFO and infrared (IrDA) encoder/decoder QFP 80-Pin
