The ST16C550 (550) is a universal asynchronous receiver and transmitter with 16 byte transmit and receiveFIFO. It operates at 2.97 to 5.5 volts. A programmablebaud rate generator can select transmit and receiveclock rates from 50 bps to 1.5 Mbps.

The ST16C550 is an improved version of the NS16C550UART with higher operating speed and lower accesstime. The ST16C550 on board status registers provides
the error conditions, type and status of the transferoperation being performed. Included is complete MODEM control capability, and a processor interrupt
system that may be software tailored to the user’srequirements.

The ST16C550 provides internal loopback capability for on board diagnostic testing.

The ST16C550 is available in 40 pin PDIP, 44 pin PLCC,and 48 pin TQFP packages. It is fabricated in anadvanced CMOS process to achieve low drain powerand high speed requirements.

FEATURES

• Pin to pin and functionally compatible to the Industry
Standard 16C550
• 2.97 to 5.5 volt operation
• 24MHz clock operation at 5V
• 16MHz clock operation at 3.3V
• 16 byte transmit FIFO
• 16 byte receive FIFO with error flags
• Full duplex operation
• Transmit and receive control
• Four selectable receive FIFO interrupt trigger levels
• Standard modem interface
• Compatible with ST16C450
• Low operating current ( 1.2mA typ.)

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