ST16C654

 OCTOBER 2003 ST16C654/654D 2.97V TO 5.5V QUAD UART WITH 64-BYTE FIFO REV. 5.0.0 GENERAL DESCRIPTION The ST16C654/654D1 (654) is an enhanced quad Universal Asynchronous Receiver and Transmitter (UART) each with 64 bytes of transmit and receive FIFOs, transmit and receive FIFO trigger levels, automatic hardware and software flow control, and data rates of up to 1.5 Mbps. Each UART has a set of registers that provide the user with operating status and control, receiver error indications, and modem serial interface controls. Selectable interrupt polarity provides flexibility to meet design requirements. An internal loopback capability allows onboard diagnostics. The 654 is available in 64 pin TQFP , 68 pin PLCC and 100 pin QFP packages. The 64 pin package only offers the 16 mode interface, but the 68 and 100 pin packages offer an additional 68 mode interface which allows easy integration with Motorola processors. The ST16C654CQ64 (64 pin) offers three state interrupt output while the ST16C654DCQ64 provides continuous interrupt output. The 100 pin package provides additional FIFO status outputs (TXRDY# and RXRDY# A-D), separate infrared transmit data outputs (IRTX A-D) and channel C external clock input (CHCCLK). The ST16C654/654D is compatible with the industry standard ST16C454 and ST16C654/554D. NOTE: 1 Covered by U.S. Patent #5,649,122. FEATURES Pin-to-pin compatible with ST16C454, ST16C554 and TI’s TL16C554AFN and TL16C754BFN Intel or Motorola Data Bus Interface s...