GENERAL DESCRIPTION
The XR16C2552 (2552) is a dual universal asynchronous receiver and transmitter (UART). The XR16C2552 is an improved version of the PC16552 UART. The 2552 provides enhanced UART functions with 16 byte FIFOs, a modem control interface, and data rates up to 4 Mbps. Onboard status registers provide the user with error indications and operational status. System interrupts and modem control features may be tailored by external software to meet specific user requirements.
FEATURES
● 2.97 volt to 5.5 volt operation
● 5 volt tolerant inputs
● Pin-to-pin and functionally compatible to National
PC16552 and Exar’s XR16L2752 and XR16C2852
● 4 Mbps transmit/receive operation (64 MHz
External Clock Frequency)
● 2 Independent UART Channels
■ Register Set Compatible to 16C550
■ 16 byte Transmit FIFO to reduce the bandwidth
requirement of the external CPU
■ 16 byte Receive FIFO with error tags to reduce
the bandwidth requirement of the external CPU
■ 4 selectable RX FIFO Trigger Levels
■ Fixed Transmit FIFO interrupt trigger level
■ Full Modem Interface (CTS#, RTS#, DSR#,
DTR#, RI#, CD#)
● DMA operation and DMA monitoring via TXRDY#
and RXRDY# pins
● UART internal register sections A & B may be
written to concurrently
● Multi-Function output allows more package
functions with few I/O pins
● Programmable character lengths (5, 6, 7, 8) with
even, odd, or no parity
● Crystal oscillator or external clock input
APPLICATIONS
● Portable Appliances
● Telecommunication Network Routers
● Ethernet Network Routers
● Cellular Data Devices
● Factory Automation and Process Controls