General description
The SC16IS741A1 is a slave I2C-bus/SPI interface to a single-channel high performance
UART. It offers data rates up to 5 Mbit/s and guarantees low operating and sleeping
current. The device comes in the TSSOP16 package, which makes it ideally suitable for
handheld, battery operated applications. This device enables seamless protocol
conversion from I2C-bus or SPI to and RS-232/RS-485 and are fully bidirectional.
The SC16IS741A’s internal register set is backward-compatible with the widely used and
widely popular 16C450. This allows the software to be easily written or ported from
another platform.
The SC16IS741A also provides additional advanced features such as auto hardware and
software flow control, automatic RS-485 support, and software reset. This allows the
software to reset the UART at any moment, independent of the hardware reset signal.

Features and benefits
2.1 General features
 Single full-duplex UART
 Selectable I2C-bus or SPI interface
 3.3 V or 2.5 V operation
 Industrial temperature range: 40 C to +95 C
 64 bytes FIFO (transmitter and receiver)
 Fully compatible with industrial standard 16C450 and equivalent
 Baud rates up to 5 Mbit/s in 16 clock mode
 Auto hardware flow control using RTS/CTS
 Auto software flow control with programmable Xon/Xoff characters
 Single or double Xon/Xoff characters
 Automatic RS-485 support (automatic slave address detection)
 RS-485 driver direction control via RTS signal
 RS-485 driver direction control inversion
 Built-in IrDA encoder and decoder interface
 Software reset
 Transmitter and receiver can be enabled/disabled independent of each other
 Receive and Transmit FIFO levels
 Programmable special character detection
 Fully programmable character formatting
 5-bit, 6-bit, 7-bit or 8-bit character
 Even, odd, or no parity
 1, 11⁄2, or 2 stop bits
 Line break generation and detection
 Internal Loopback mode
 Sleep current less than 30 A at 3.3 V
 Industrial and commercial temperature ranges
 Available in the TSSOP16 package
2.2 I2C-bus features
 Noise filter on SCL/SDA inputs
 400 kbit/s maximum speed
 Compliant with I2C-bus fast speed
 Slave mode only
2.3 SPI features
 Slave mode only
SPI Mode 0