Overview
Information | High Performance 5V and 3.3V Quad UART |
---|---|
Data Bus Interface | Intel, Motorola |
# of Channels | 4 |
Max Data Rate 5V (Mbps) | 6.25 |
Max Data Rate 3.3V (Mbps) | 4 |
Max Data Rate 2.5V (Mbps) | na |
Max Data Rate 1.8V (Mbps) | na |
Tx FIFO (Bytes) | 64 |
Rx FIFO (Bytes) | 64 |
Auto Flow Control | ✔ |
Auto RS-485 Half-Duplex Control | ✔ |
Multidrop (9-bit) Mode | |
Fractional Baud Rate Generator | |
Power Down Mode | ✔ |
Supply Voltage Range VCC (V) | 2.97 to 5.5 |
Auto RTS/CTS | ✔ |
Package | LQFP-64 |
FIFO Level Counters | ✔ |
Selectable/ Programable Trigger Levels | P |
IrDA Sup | ✔ |
5V Tolerant Inputs | ✔ |
Max UART/GPIO Input Voltage (V) | 5.5 |
Max UART/GPIO Output Voltage (V) | VCC |
Temperature Range (°C) | -40 to 85 |
The XR16L7841 is a four-channel Universal Asynchronous Receiver and Transmitter (UART). The device is designed for high bandwidth requirements in communication systems. The XR16L784 (784) integrates the functions of four enhanced 16550 UARTs, a general purpose 16-bit timer/counter and an on-chip oscillator. The device configuration registers include a set of four consecutive interrupt source registers that provides interrupt-status for all four UARTs, timer/counter, and a sleep wake up indicator.
Each UART channel has its own 16550 UART-compatible configuration register set for individual channel control, status, and data transfer. Additionally, each UART channel has 64-byte transmit and receive FIFOs, automatic RTS/CTS or DTR/DSR hardware flow control with hysteresis control, and automatic Xon/Xoff and special character software flow control. The XR16L784 also has programmable transmit and receive FIFO trigger levels, FIFO level counters, infrared encoder and decoder (IrDA ver 1.0), and a programmable baud rate generator with a prescaler of divide by one or four, and data rate up to 6.25 Mbps with 8x sampling clock rate.
NOTE: 1 Covered by U.S. Patents #5,649,122 and #5,832,205
- 5V and 3.3V Operation with 5V Tolerant Inputs
- 8-bit Intel or Motorola Data Bus Interface
- Single Open Drain Interrupt for all 4 channels
- Global Interrupt Source Registers for all channels
- Fifth Generation “Flat” Register Set
- 16C550-Compatible Registers
- 64-byte Transmit and Receive FIFO
- Transmit and Receive FIFO Level Counters
- Programmable TX and RX FIFO Level Trigger
- Automatic RTS/CTS or DTR/DSR Flow Control
- RS485 Half-duplex Control with Selectable Delay
- Programmable Data Rate with Prescaler
- 64-pin LQFP Package
- Pb-Free, RoHS Compliant Versions Offered
- Remote Access Servers
- Ethernet Network to Serial Ports
- Network Management
- Factory Automation and Process Control
- Point-of-Sale Systems
- Multi-port RS-232/RS-422/RS-485 Cards
Documentation & Design Tools
Type | Title | Version | Date | File Size |
---|---|---|---|---|
Data Sheets | XR16L784 High Performance 2.97V to 5.5V Quad UART | 1.2.3 | July 2008 | 1 MB |
Application Notes | DAN-190, MaxLinear UARTs in RS-485 Applications | R01 | July 2023 | 2.4 MB |
Application Notes | AN-204, UART Sleep Mode | 1.0.0 | June 2010 | 515.8 KB |
Application Notes | DAN-170, Migrating to EXAR’s Fifth Generation UARTS: XR16L784/788 | 1.0.0 | August 2004 | 41.2 KB |
Application Notes | DAN-144, XR16L784 vs. Ox16C954 | 1.0.0 | August 2002 | 25.5 KB |
Application Notes | DAN-125, XR16L784 Compared with the Philips SC28C94 and SC28L194 | 1.0.0 | June 2002 | 21.3 KB |
Application Notes | DAN-135, XR16L784 vs. TL16C754B | 1.0.0 | June 2001 | 19.5 KB |
User Guides & Manuals | Evaluation Board User's Manual | 1.3.0 | August 2003 | 22 KB |
Software: Drivers | DOS | 1.0.0 | December 2009 | 4 KB |
Software: Drivers | Linux 2.4 | 1.0.0.0 | December 2009 | 23.4 KB |
Software: Drivers | Linux 2.6 | 1.0.0.0 | December 2009 | 10.7 KB |
Software: Drivers | Linux 2.6.13 | 1.0.0 | December 2009 | 10.8 KB |
Software: Drivers | Linux 2.6.18 | 1.0.0 | December 2009 | 11.6 KB |
Software: Drivers | Linux 2.6.18 | 1.0.0 | December 2009 | 12.1 KB |
Software: Drivers | Linux 2.6.21 | 1.0.0 | December 2009 | 11.6 KB |
Software: Drivers | Windows 2000 & XP | 4.0.2.0 | December 2009 | 687.2 KB |
Software: Drivers | Windows NT | 1.0.0.0 | December 2009 | 1.4 MB |
Software: Drivers | Windows XP | 4.0.2.0 | December 2009 | 644.5 KB |
Software: Drivers | Windows XP & 2000 | 1.3.0.0 | December 2009 | 61 KB |
Product Brochures | Interface Brochure | R01 | June 2024 | 3.6 MB |
Schematics & Design Files | PCI Eval Board Schematic | 1.1.0 | August 2007 | 168.7 KB |
Schematics & Design Files | ISA Eval Board Schematic | 1.4.0 | August 2007 | 111.2 KB |
Quality & RoHS
Part Number | RoHS | Exempt | RoHS | Halogen Free | REACH | TSCA | MSL Rating / Peak Reflow | Package |
---|---|---|---|---|---|---|---|
XR16L784CV-F | N | Y | Y | Y | Y | L3 / 260ᵒC | LQFP64 |
XR16L784IV-F | N | Y | Y | Y | Y | L3 / 260ᵒC | LQFP64 |
XR16L784IVTR-F | N | Y | Y | Y | Y | L3 / 260ᵒC | LQFP64 |
Click on the links above to download the Certificate of Non-Use of Hazardous Substances.
Parts & Purchasing
Part Number | Pkg Code | Min Temp | Max Temp | Status | Suggested Replacement | Buy Now | Order Samples | PDN |
---|---|---|---|---|---|---|---|---|
XR16L784CV-F | LQFP64 | 0 | 70 | Active | Order | |||
XR16L784CVTR-F | LQFP64 | 0 | 70 | OBS | XR16L784CV-F | |||
XR16L784IV-F | LQFP64 | -40 | 85 | Active | Order | |||
XR16L784IVTR-F | LQFP64 | -40 | 85 | OBS | XR16L784IV-F |
Active - the part is released for sale, standard product.
EOL (End of Life) - the part is no longer being manufactured, there may or may not be inventory still in stock.
CF (Contact Factory) - the part is still active but customers should check with the factory for availability. Longer lead-times may apply.
PRE (Pre-introduction) - the part has not been introduced or the part number is an early version available for sample only.
OBS (Obsolete) - the part is no longer being manufactured and may not be ordered.
NRND (Not Recommended for New Designs) - the part is not recommended for new designs.
Packaging
Pkg Code | Details | Quantities | Dimensions |
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LQFP64 |
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Notifications
FAQs & Support
Search our list of FAQs for answers to common technical questions.
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Please check that all the following conditions are satisfied first.
- no interrupts pending (ISR bit-0 = 1)
- modem inputs are not toggling (MSR bits 0-3 = 0)
- RX input pin is idling HIGH • divisor (the value in DLL register) is non-zero
- TX and RX FIFOs are empty
Be sure sleep mode bit has been set to 1. If there are multiple UART channels, the sleep conditions must be true for all channels.
See more on Sleep Mode in AN204 UART Sleep Mode.
Yes. Note: some devices do have powersave mode. If UART goes into powersave mode, then the registers are not accessible.
See more on Sleep Mode in AN204 UART Sleep Mode.
Read LSR register to check whether the UART receives the data or not.
- If LSR value is 0x60, it means that either UART receiver FIFO doesn’t receive the data or the data in receiver FIFO has been read out before the read of LSR.
- If LSR value is 0x00, it means data is still in the THR (clock doesn’t oscillate to transmit data).
- If LSR value is 0xFF, it means either UART is in powersave mode or UART is powered off. For those devices with powersave mode, be sure that UARTS are not in powersave mode.
See more on Sleep Mode in AN204 UART Sleep Mode.
- Check whether the register set can be accessed.
- Check whether the crystal is oscillating fully.
- Check whether the data can be transmitted in internal loopback mode.
See more on Sleep Mode in AN204 UART Sleep Mode.
Videos
MxL UARTs Auto RS-485 Direction Control
This video describes how the automatic RS-485 half-duplex direction control feature in MaxLinear UARTs reduces driver development and frees up CPU/MCU loading. This feature eliminates the need to monitor the status of the UART’s transmit shift register and automatically switches MaxLinear RS-485 transceivers from the transmit mode to the receive mode. This video summarizes the content in application note DAN-190.