The MT90210 is a 100-pin device used to interface a parallel bidirectional 8 bit bus to 24 time division multiplexed (TDM) serial streams. The device is configured to perform simultaneous parallel-to-serial and serial-to-parallel conversion with the capability of handling up to 3072 channels, 1536 on the transmit and 1536 on the receive direction. Depending on the operation mode selected at the mode pins, the individual 64 Kb/s channels on the serial links may be configured as inputs or outputs. The data on the parallel bus is in a format suitable for interfacing with a dual-port RAM. Depending on the data rate selected by the MD0-MD2 input pins, serial data is clocked in and out on the serial streams at either 2.048, 4.096 or 8.192 Mb/s.