
Description
This dual-channel product family is highly integrated and built for small board space, low voltage and high bandwidth requirements found in a variety of handheld and battery operated applications. These include Point-of-Sale (POS) terminals, tablets and notepads, CDMA cellular phones, expansion modules, instrumentation, cellular base stations, wireless infrared appliances and industrial automation controls.
The series consists of four devices: XR16L2450, XR16L2550, XR16L2551 and XR16L2552. Each has two independently controlled UART channels and operates over a broad range power source of 2.25V to 5.5V with 5V tolerant inputs.
The XR16L2551 uniquely offers a very small 32-QFN, 5x5x0.9mm, package with PowerSave feature to conserve power down to less than 30uA* of current consumption. These attributes are a perfect combination for tight space and/or battery operated designs. The PowerSave feature eliminates the need for two external octal transceivers to reduce board space requirement and lower overall system costs. The XR16L2551 also offers a pin select for Intel or Motorola data bus interface to reduce hardware design cycle.
The XR16L2550, XR16L2551 and XR16L2552 have 16-byte of TX and RX FIFOs for larger data buffering and provide automatic hardware (RTS/CTS) or software (Xon/Xoff) flow control to eliminate receiver data overflow and wasteful re-transmissions. In addition, the devices include the wireless infrared encoder/decoder for wireless communications. The XR16L2450 has one byte of TX and RX FIFO as its predecessor, the ST16C2450, but with lower operating voltage and 5V tolerant inputs. The 4 devices are pin and function compatible with their previous 5V series.
Features
- Wide Range Supply Voltage Operation of 2.25V to 5.5V
- Automatic RTS/CTS Hardware Flow Control
- Automatic Xon/Xoff software flow control
- 16-byte Transmit/Receive FIFO to Reduce Bandwidth Requirements of External CPU
- Wireless Infrared Encoder and Decoder
- Full Modem Interface (TXD, RXD, RTS, CTS, DTR,DSR, RI, CD)
- Pb-Free, RoHS Compliant Versions Offered
Documentation
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Datasheet
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Application Notes
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Manuals
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Product Brochure
Application
- Handheld Appliances
- Battery Operated Instruments
- Portable Appliances
- CDMA Cellular Phones
- Cellular Base Stations
- Telecommunications Network Routers
- Industrial Automation Controls
Design Tools
Package Type | Vcc | Temp | Mode | Version | File |
---|---|---|---|---|---|
PLCC | 2.5V | Industrial | Intel | 1 | |
PLCC | 3.3V | Industrial | Intel | 1 | |
PLCC | 5V | Industrial | Intel | 1 | |
TQFP | 2.5V | Industrial | Intel | 1 | |
TQFP | 3.3V | Industrial | Intel | 1 | |
TQFP | 5V | Industrial | Intel | 1 |
Packaging
Parts & Purchasing
Part Number | Pkg Code | Min Temp | Max Temp | Status | Buy Now | Order Samples |
---|---|---|---|---|---|---|
XR16L2552IJ-F | PLCC44 | -40 | 85 | OBS |
Suggested: XR16L2552IJTR-F |
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XR16L2552IJTR-F | PLCC44 | -40 | 85 | Active | Order | |
XR16L2552IM-F | TQFP48 | -40 | 85 | Active | Order | |
XR16L2552IMTR-F | TQFP48 | -40 | 85 | OBS |
Suggested: XR16L2552IM-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.
Quality & Environmental Data
Part Number | RoHS | Exempt | RoHS | Halogen Free | REACH | MSL Rating / Peak Reflow | Package |
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XR16L2552IM-F | N | Y | Y | Y | L3 / 260ᵒC | TQFP48 |
XR16L2552IJTR-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
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.
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.
- 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.
https://www.exar.com/quality-assurance-and-reliability/lead-free-program
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.
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.
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