EVALUATION KIT AVAILABLE MAX14830 Quad Serial UART with 128-Word FIFOs General Description Benefits and Features 2 The MAX14830 is an advanced quad universal asynchro- Bridges an SPI/MICROWIRE or I C Microprocessor nous receiver-transmitter (UART), each UART having Bus to an Asynchronous Interface like RS-485, SM 128 words of receive and transmit first-in/first-out (FIFO) RS-232, or IrDA 2 and a high-speed serial peripheral interface (SPI) or I C SIR- and MIR-Compliant IrDA Encoder/Decoder Line Noise Indication Ensures Data Link Integrity controller interface. A PLL and fractional baud-rate generators allow a high degree of flexibility in baud-rate Deep, 128-Word Buffer and Automated Control programming and reference clock selection. Features Help Offload Activity on the Microcontroller 2 128-Word Transmit and Receive FIFOs per UART Each of the four UARTs is selected by in-band SPI/I C Transmitter Synchronization Through SPI Commands addressing. Logic-level translation on the transceiver and Automatic Hardware Flow Control Using RTS and controller interfaces allows ease of interfacing to micro- CTS Outputs and Inputs controllers, FPGAs, and transceivers that are powered by Automatic Software Flow Control (XON/XOFF) differing supply voltages. Auto Transceiver Direction Control Extensive features simplify transceiver control in Programmable Setup and Hold Times for Transceiver half-duplex communication applications. The MAX14830 Control features the ability to synchronize the start of individual Auto Transmitter Disable UARTs transmission by SPI-based triggering. On-board Half-Duplex Echo Suppression timers allow programming of delays between transmitters 9-Bit Multidrop-Mode Data Filtering as well as clock generation on GPIOs. Special Character Detection The 128-word FIFOs have advanced FIFO control GPIO-Based Character Detection reducing host processor data flow management. Four Timers Routed to GPIOs 16 Flexible GPIOs with 20mA Drive Capability The MAX14830 is available in a 48-pin TQFN (7mm x 7mm) package and is specified to operate. over the Saves Board Space extended -40C to +85C temperature range. TQFN (7mm x 7mm) Package Fast Data Rates Allow Maximum System Flexibility Applications Across Interface Standards Industrial Control Systems 6Mbaud (max) Data Rate in 16x Sampling Mode Programmable Logic Controllers (PLC) 12/24Mbaud (max) Data Rate in 2x/4x Rate Modes IO-Link Master Controllers High-Resolution Programmable Baud-Rate Medical Systems SPI Up to 26MHz Clock Rate Point-of-Sales Systems 2 Fast Mode Plus (Pm+) I C Up to 1MHz Airplane Communication Buses Integrated Internal Oscillator Eliminates the Need for an External Oscillator and Reduces the BOM Cost Fractional Baud-Rate Generators, Predivider, and Phase-Locked Loop (PLL) Logic-Level Translation Down to 1.61V on the Con- troller and Transceiver Interfaces Ensures System Compatibility Typical Operating Circuit and Ordering Information appear Register Compatible with MAX3107, MAX3108, at end of data sheet. MAX3109 IrDA is a registered service mark of Infrared Data Association Corporation. 19-5547 Rev 7 2/16MAX14830 Quad Serial UART with 128-Word FIFOs TABLE OF CONTENTS General Description ............................................................................ 1 Applications .................................................................................. 1 Benefits and Features .......................................................................... 1 Functional Diagram ............................................................................ 7 Absolute Maximum Ratings ...................................................................... 8 Package Thermal Characteristics ................................................................. 8 DC Electrical Characteristics ..................................................................... 8 AC Electrical Characteristics 10 Test Circuits/Timing Diagrams ................................................................... 13 Typical Operating Characteristics ................................................................ 14 Pin Configuration ............................................................................. 15 Pin Description ............................................................................... 15 Detailed Description........................................................................... 18 Receive and Transmit FIFOs 18 Transmitter Operation 18 Receiver Operation 19 Line Noise Indication . 20 Clocking and Baud-Rate Generation 20 Crystal Oscillator . 20 External Clock Source . 20 PLL and Predivider 20 Fractional Baud-Rate Generators . 21 2x and 4x Rate Modes . 21 Low-Frequency Timer 22 UART Clock to GPIO 22 Multidrop Mode . 22 Auto Data Filtering in Multidrop Mode . 22 Auto Transceiver Direction Control 22 Transmitter Triggering and Synchronization . 23 Transmitter Synchronization 23 Intrachip and Interchip Synchronization . 23 Delayed Triggering 23 Trigger Accuracy . 24 Synchronization Accuracy 24 Auto Transmitter Disable 24 Echo Suppression . 24 Auto Hardware Flow Control . 26 AutoRTS Control . 26 Maxim Integrated 2 www.maximintegrated.com