Overview
Information | 1.62V to 3.63V UART with 64-Byte FIFO and VLIO Interface |
---|---|
Data Bus Interface | VLIO |
# of Channels | 1 |
Max Data Rate 5V (Mbps) | na |
Max Data Rate 3.3V (Mbps) | 20 |
Max Data Rate 2.5V (Mbps) | 16 |
Max Data Rate 1.8V (Mbps) | 10 |
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) | 1.62 to 3.63 |
Auto RTS/CTS | ✔ |
Package | QFN-32 |
FIFO Level Counters | ✔ |
Selectable/ Programable Trigger Levels | P |
IrDA Sup | ✔ |
5V Tolerant Inputs | |
Max UART/GPIO Input Voltage (V) | VCC |
Max UART/GPIO Output Voltage (V) | VCC |
Temperature Range (°C) | -40 to 85 |
The XR16M781¹ (M781) is an enhanced Universal Asynchronous Receiver and Transmitter (UART) with a VLIO bus interface and has 64 bytes of transmit and receive FIFOs, programmable transmit and receive FIFO trigger levels, automatic hardware and software flow control, and data rates of up to 20 Mbps at 3.3V, 16 Mbps at 2.5V and 10 Mbps at 1.8V with 4X data sampling rate.
The Auto RS-485 Half-Duplex Direction control feature simplifies both the hardware and software for half-duplex RS-485 applications. In addition, the Multidrop mode with Auto Address detection increases the performance by simplifying the software routines.
The Independent TX/RX Baud Rate Generator feature allows the transmitter and receiver to operate at different baud rates. Power consumption of the M781 can be minmized by enabling the sleep mode and PowerSave mode.
The M781 has a 16550 compatible register set that provide users with operating status and control, receiver error indications, and modem serial interface controls. An internal loopback capability allows onboard diagnostics. The M781 is available in 24-pin QFN, 32-pin QFN and 25-pin BGA packages.
- VLIO bus interface
- Pin-to-pin compatible with SC16C850V and SC16C850SV in 32-QFN package
- 20 Mbps maximum data rate
- Programmable TX/RX FIFO Trigger Levels
- TX/RX FIFO Level Counters
- Independent TX/RX Baud Rate Generator
- Fractional Baud Rate Generator
- Auto RTS/CTS Hardware Flow Control
- Auto XON/XOFF Software Flow Control
- Auto RS-485 Half-Duplex Direction Control
- Multidrop mode w/ Auto Address Detect
- Sleep Mode with Automatic Wake-up
- PowerSave mode
- Infrared (IrDA 1.0 and 1.1) mode
- 1.62V to 3.63V supply operation
- Crystal oscillator or external clock input
- Personal Digital Assistants (PDA)
- Cellular Phones/Data Devices
- Battery-Operated Devices
- Global Positioning System (GPS)
- Bluetooth
Documentation & Design Tools
Type | Title | Version | Date | File Size |
---|---|---|---|---|
Data Sheets | XR16M781 1.62V to 3.63V UART with 64-Byte FIFO and VLIO Interface | 1.0.1 | August 2009 | 1.1 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-200, MULTIDROP/9-BIT MODE Feature | 1 | April 2009 | 143.5 KB |
Application Notes | DAN-201, Independant TX and RX Baud Rate Generator | 1 | April 2009 | 144.2 KB |
User Guides & Manuals | XR16M781 User Manuals | 1.0.0 | June 2009 | 416.8 KB |
Product Flyers | 1.62V to 3.63V High Performance UARTs | 1.0.0 | March 2009 | 361.9 KB |
Product Brochures | Interface Brochure | R01 | June 2024 | 3.6 MB |
Schematics & Design Files | Schematics | 1.0.0 | June 2009 | 57.1 KB |
Simulation Models
Package Type | Vcc | Temp | Mode | Version | File |
---|---|---|---|---|---|
BGA | 1.8V | Industrial | Intel | 1 | |
BGA | 2.5V | Industrial | Intel | 1 | |
BGA | 3.3V | Industrial | Intel | 1 | |
QFN | 1.8V | Industrial | Intel | 1 | |
QFN | 2.5V | Industrial | Intel | 1 | |
QFN | 3.3V | Industrial | Intel | 1 | |
QFN | 1.8V | Industrial | Intel | 1 | |
QFN | 2.5V | Industrial | Intel | 1 | |
QFN | 3.3V | Industrial | Intel | 1 |
Quality & RoHS
Part Number | RoHS | Exempt | RoHS | Halogen Free | REACH | TSCA | MSL Rating / Peak Reflow | Package |
---|---|---|---|---|---|---|---|
XR16M781IL32-F | N | Y | Y | Y | Y | L2 / 260ᵒC | QFN32 5x5 OPT3 |
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 | PDN |
---|---|---|---|---|---|---|
XR16M781IB25-F | BGA25 | -40 | 85 | OBS | XR16M781IL24-F , XR16M781IL32-F | |
XR16M781IB25TR-F | BGA25 | -40 | 85 | OBS | XR16M781IL24TR-F , XR16M781IL32TR-F | |
XR16M781IL24-F | QFN24 4x4 OPT1 | -40 | 85 | OBS | ||
XR16M781IL24TR-F | QFN24 4x4 OPT1 | -40 | 85 | OBS | ||
XR16M781IL32-F | QFN32 5x5 OPT3 | -40 | 85 | OBS | ||
XR16M781IL32TR-F | QFN32 5x5 OPT3 | -40 | 85 | OBS | XR16M781IL32-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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QFN24 4x4 OPT1 |
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QFN32 5x5 OPT3 |
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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.