Description

The ST16C654* 1is a universal asynchronous receiver and transmitter (UART) with a dual foot print interface compatible with the ST16C554 and ST68C554. The 654 is an enhanced UART with 64 byte FIFOs, automatic hardware/software flow control, and data rates up to 1.5Mbps. Onboard status registers provide the user with error indications and operational status, modem interface control. System interrupts may be tailored to meet user requirements. An internal loopback capability allows onboard diagnostics. The 654 is available in 64 pin TQFP, 68 pin PLCC, and 100 pin QFP packages.

Specifications and Features

• Compatibility with the Industry Standard ST16C454/554, ST68C454/554, TL16C554
• 1.5 Mbps transmit/receive operation (24MHz)
• 64 byte transmit FIFO
• 64 byte receive FIFO with error flags
• Automatic software/hardware flow control
• Programmable Xon/Xoff characters
• Independent transmit and receive control
• Software selectable Baud Rate Generator prescaleable clock rates of 1X, 4X.
• Four selectable Transmit/Receive FIFO interrupt trigger levels
• Standard modem interface or infrared IrDA encoder/decoder interface
• Software flow control turned off optionally by any (Xon) RX character
• Independent MIDI interface on 100 pin packages
• 100 pin packages offer internal register FIFO monitoring and separate IrDA TX outputs
• Sleep mode (200mA stand-by)

Application Scenarios

The ST16C654CQ64-F is commonly used as a level converter for RS-232 to 3.3V or 5V systems, especially in situations that require longer cable lengths. It can also be used in many types of embedded systems, such as PLC, motor control systems, and automotive diagnostic systems.

Comparison

• High speed up to 1.5Mbps
• 64 byte transmit and receive FIFOs with error flags
• Automatic hardware/software flow control
• Onboard status registers provide the user with error indications and modem interface control
• System interrupts may be tailored to meet user requirements
• Internal loopback capability allows onboard diagnostics
• Low sleep mode power consumption (200mA stand-by)

• The ST16C654CQ64-F is relatively expensive compared to other UARTs.
• The 100 pin QFP package may be too large for some applications.