Overview
Information | High-Performance 2.25V - 5.5V DUART |
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Data Bus Interface | Intel |
# of Channels | 2 |
Max Data Rate 5V (Mbps) | 3.125 |
Max Data Rate 3.3V (Mbps) | 1.875 |
Max Data Rate 2.5V (Mbps) | 1 |
Max Data Rate 1.8V (Mbps) | na |
Tx FIFO (Bytes) | 16 |
Rx FIFO (Bytes) | 16 |
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) | 2.25 to 5.5 |
Auto RTS/CTS | ✔ |
Package | PLCC-44, TQFP-48 |
FIFO Level Counters | |
Selectable/ Programable Trigger Levels | S |
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 |
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.
- 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
- Handheld Appliances
- Battery Operated Instruments
- Portable Appliances
- CDMA Cellular Phones
- Cellular Base Stations
- Telecommunications Network Routers
- Industrial Automation Controls
Documentation & Design Tools
Type | Title | Version | Date | File Size |
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Data Sheets | XR16L2552 2.25V to 5.5V DUART with 16-Byte FIFO | 1.1.2 | September 2010 | 284.8 KB |
Application Notes | AN-204, UART Sleep Mode | 1.0.0 | June 2010 | 515.8 KB |
User Guides & Manuals | Evaluation Board User's Manual | 1.3.0 | August 2003 | 24.7 KB |
Product Brochures | Interface Brochure | R01 | June 2024 | 3.6 MB |
Schematics & Design Files | ISA Eval Board Schematic | 1.4.0 | August 2007 | 109 KB |
Schematics & Design Files | PCI Eval Board Schematic | 1.1.0 | July 2007 | 167.8 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 | 12.1 KB |
Software: Drivers | Windows XP & 2000 | 1.3.0.0 | December 2009 | 61 KB |
Quality & RoHS
Part Number | RoHS | Exempt | RoHS | Halogen Free | REACH | TSCA | MSL Rating / Peak Reflow | Package |
---|---|---|---|---|---|---|---|
XR16L2552IM-F | N | Y | Y | Y | Y | L3 / 260ᵒC | TQFP48 |
XR16L2552IJTR-F | N | Y | Y | Y | Y | L1 / 260ᵒC | PLCC44 |
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 |
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XR16L2552IJ-F | PLCC44 | -40 | 85 | OBS | XR16L2552IJTR-F | |||
XR16L2552IJTR-F | PLCC44 | -40 | 85 | Active | Order | |||
XR16L2552IM-F | TQFP48 | -40 | 85 | Active | Order | |||
XR16L2552IMTR-F | TQFP48 | -40 | 85 | OBS | 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.
Packaging
Pkg Code | Details | Quantities | Dimensions |
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PLCC44 |
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TQFP48 |
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Notifications
FAQs & 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.
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The Parts & Purchasing section of the product page shows the Status of all orderable part numbers for that product. Click Show obsolete parts, to see all EOL or OBS products.
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.