GENERAL DESCRIPTION
The ST16C1550 and ST16C1551 UARTs (here on denoted as the ST16C155X) are improved versions of the SSI 73M1550 and SSI 73M2550 UART with higher operating speed and lower access time. The ST16C155X provides enhanced UART functions with 16 byte FIFOs, a modem control interface, independent programmable baud rate generators with clock rates up to 1.5 Mbps. Onboard status registers provide the user with error indications and operational status. System interrupt and modem control features may be tailored by external software to meet specific user requirements.

FEATURES
• Pin and functionally compatible to SSI 73M1550/2550
• 16 byte Transmit FIFO
• 16 byte Receive FIFO with error flags
• 4 selectable Receive FIFO interrupt trigger levels
• Modem Control Signals (CTS#, RTS#, DSR#, DTR#, RI#, CD#)
• Programmable character lengths (5, 6, 7, 8) with even, odd or no parity
• Crystal or external clock input (except 28 pin ST16C1551, external clock only)
• 1.5 Mbps Transmit/Receive operation (24 MHz) with programmable clock control
• Power Down Mode (50 uA at 3.3 V, 200 uA at 5 V)
• Software controllable reset output
• 2.97 to 5.5 Volt operation

APPLICATIONS
• Battery Operated Electronics
• Internet Appliances
• Handheld Terminal
• Personal Digital Assistants
• Cellular Phones DataPort