3.3 V, 5 V UART, 3.125 Mbit/s, with 256-byte FIFO

The SC28L201 is a high performance UART. Its functional and programming features closely match but greatly extend those of previous Philips UARTs. Its configuration on power-up is similar that of the SC26C92. Its differences from the previous Philips UARTs are: 256-character receiver, 256-character transmit FIFOs, 3.3 V and 5 V compatibility, 8 I/O ports for arbitrating interrupt system and overall faster bus and data speeds and is fabricated in an advanced 0.5 micron CMOS process.

It is a member of the IMPACT line of data communications parts.

Pin programming will allow the device to operate with either the Motorola or Intel bus interface by changing the function of some pins (reset is inverted, DACKN, and IACKN enabled, for example).

The Philips Semiconductors SC28L201 Universal Asynchronous Receiver/Transmitter (UART) is a single-chip CMOS-LSI communications device that provides a full-duplex asynchronous receiver/transmitter channel in a single package. It interfaces directly with microprocessors and may be used in a polled or interrupt driven system. The use of the Interrupt system provides intelligent interrupt vectors.

The operating mode and data format of the channel may be programmed independently. Additionally, the receiver and transmitter can select its operating speed as one of twenty-seven fixed baud rates; a 16x clock derived from one of two programmable counter/timers, or an external 1x or 16x clock. The baud rate generator and counter/timer can operate directly from a crystal or from external clock inputs. The ability to independently program the operating speed of the receiver and transmitter make the UART particularly attractive for dual-speed channel applications such as clustered terminal systems and bridges.

Each receiver and transmitter is buffered by 256-character FIFOs to nearly eliminate the potential of receiver overrun, transmitter underrun and to reduce interrupt overhead in interrupt driven systems. In addition, a flow control capability (Xon/Xoff and RTS/CTS) is provided to disable a remote transmitter when the receiver buffer is full.

Also provided on the SC28L201 is a multipurpose 8-bit I/O for the channel. These can be used as general-purpose I/O ports or can be assigned specific functions (such as clock inputs or status and interrupt outputs) under program control. Normally they will be used for modem control and DMA interface. All ports have change of state detectors and input sections are always active making output signals available to the internal circuits and the control processor.

The SC28L201 is available in a TSSOP48 package. For other package options, contact Philips.