
Description
The XR16C850 (850) is a universal asynchronous receiver and transmitter (UART) and is pin compatible with the ST16C650A UART. The 850 is an enhanced UART with 128 byte FIFOs, automatic hardware/soft- ware flow control, and data rates up to 1.5Mbps. It include transmit/receive FIFO counters to increase data loading and unloading from controlling CPU. Onboard status registers provide the user with error indications and operational status.Modem interface control is included and can be optionally configured to operate with the Infrared (IrDA) encoder/decoder. The system interrupts may be tailored to meet user requirements. An internal loop-back capability allows onboard diagnostics.
The 850 is available in 44 pin PLCC and 48 TQFP packages. The XR16C850 provides both the standard (STD) mode or PC ISA bus (PC) mode. The STD mode is compatible with the ST16C450 and ST16C550 while the PC mode allows connection to the PC ISA bus.
Features
- Pin to pin compatible to ST16C550, ST16C650A and TL16C750
- Transmit/receive FIFO counters
- 128 bytes of Transmit/Receive FIFO
- RS-485 half duplex direction control
- Automatic software/hardware flow control
- Programmable, selectable transmit/receive trigger levels
- Infrared transmitter and receiver encoder/decoder
- Up to 1.5Mbps data rate
- Sleep mode (100mA standby)
- Small 7x7mm TQFP
- +5 or 3.3 Volts operation
- Windows 2 drivers available
- Pb-Free, RoHS Compliant Versions Offered
Documentation
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Datasheet
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Application Notes
- DAN-107, Interfacing 16Cxxx UARTs to a CPU
- DAN-108, UART Crystal Oscillator Design Guide
- DAN-102, Infrared Application with ST16C580, ST16C650A or XR16C850 UART
- DAN-132, EXAR's ST16C550 vs. TL16C550C
- DAN-131, EXAR's ST16C650A vs. TL16C750
- DAN-140, EXAR's XR16C850 vs. OX16C950
- DAN-136, Exar 16L580 Compared to TI's TL6C550C (48-tqp)
- DAN-190, Exar UARTs in RS-485 Applications
- AN-204, UART Sleep Mode
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Manuals
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Product Brochure
Application
- Battery Operated Electronics
- Internet Appliances
- Handheld Terminal
- Personal Digital Assistants
- Cellular Phones DataPort
Design Tools
Package Type | Vcc | Temp | Mode | Version | File |
---|---|---|---|---|---|
PLCC | 3.3V | Commercial | Intel | 1 | |
PLCC | 3.3V | Commercial | PC COM | 1 | |
PLCC | 5V | Commercial | Intel | 1 | |
PLCC | 5V | Commercial | PC COM | 1 | |
TQFP | 3.3V | Commercial | Intel | 1 | |
TQFP | 3.3V | Commercial | PC COM | 1 | |
TQFP | 5V | Commercial | Intel | 1 | |
TQFP | 5V | Commercial | PC COM | 1 | |
PLCC | 3.3V | Industrial | Intel | 1 | |
PLCC | 3.3V | Industrial | PC COM | 1 | |
PLCC | 5V | Industrial | Intel | 1 | |
PLCC | 5V | Industrial | PC COM | 1 | |
TQFP | 3.3V | Industrial | Intel | 1 | |
TQFP | 3.3V | Industrial | PC COM | 1 | |
TQFP | 5V | Industrial | Intel | 1 | |
TQFP | 5V | Industrial | PC COM | 1 |
Packaging
Parts & Purchasing
Part Number | Pkg Code | Min Temp | Max Temp | Status | Buy Now | Order Samples |
---|---|---|---|---|---|---|
XR16C850CJ-F | PLCC44 | 0 | 70 | Active | Order | |
XR16C850CJTR-F | PLCC44 | 0 | 70 | OBS |
Suggested: XR16C850CJ-F |
|
XR16C850CM-F | TQFP48 | 0 | 70 | Active | Order | |
XR16C850CMTR-F | TQFP48 | 0 | 70 | OBS |
Suggested: XR16C850CM-F |
|
XR16C850IJ-F | PLCC44 | -40 | 85 | OBS |
Suggested: XR16C850CJ-F |
|
XR16C850IJTR-F | PLCC44 | -40 | 85 | OBS |
Suggested: XR16C850CJ-F |
|
XR16C850IM-F | TQFP48 | -40 | 85 | Active | Order |
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.
Quality & Environmental Data
Part Number | RoHS | Exempt | RoHS | Halogen Free | REACH | MSL Rating / Peak Reflow | Package |
---|---|---|---|---|---|---|
XR16C850CM-F | N | Y | Y | Y | L3 / 260ᵒC | TQFP48 |
XR16C850IM-F | N | Y | Y | Y | L3 / 260ᵒC | TQFP48 |
XR16C850CJ-F | N | Y | Y | Y | L1 / 260ᵒC | PLCC44 |
Click on the links above to download the Certificate of Non-Use of Hazardous Substances.
Support
Search our list of FAQs for answers to common technical questions.
For material content, environmental, quality and reliability questions review the Quality tab or visit our Quality page.
For ordering information and general customer service visit our Contact Us page.
Frequently Asked Questions
https://www.exar.com/quality-assurance-and-reliability/lead-free-program
In this example, we looked for XRA1201. Click on part number header or on the link at the bottom of the result. This brings you to the product page. For example:
Click on Parts & Purchasing, highlighted with the blue arrow above. The screen changes to:
Notice the status column and the “Show obsolete parts” link. A legend tells you the definition of the different statuses. Click on the “Show obsolete parts” link to see EOL or OBS part numbers along with the Active part numbers, the legend still present:
Another method to find out if a part is OBS or EOL is to click on SUPPORT at the top:
And then Product Change Notifications:
Type the part into the search, and click on one of the part numbers from the drop down menu. Then you can look for the Product Discontinuation Notice, which generally is at the top of the list, for example:
If you see this, it tells you that this particular orderable part has been discontinued and when the last order date is, or was. If you click on the file, then you can view the notice we sent about this if you purchased the part in the recent past. It may also advise of a replacement part. When an orderable part first becomes discontinued, Product Discontinuation Notices are sent are sent to those who have purchased the parts in the recent past, if purchased directly, with a dated opportunity to place a last order.
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.
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