Features: · 2.25 to 5.5 Volt Operation
· 5 Volt Tolerant Inputs
· Functionally Compatible to ST16C2550 and XR16C2850 with 4 additional inputs
· Intel or Motorola Data Bus Interface Select
· Two Independent UARTs
·Up to 6.25 Mbps at 5 Volt, 4 Mbps at 3.3 Volt, and 3 Mbps at 2.5 Volt with 8X sampling rate
· 64 bytes of Transmit and Receive FIFOs
·Transmit and Receive FIFO Level Counters
·Programmable TX and RX FIFO Trigger Levels
· Automatic Hardware (RTS/CTS) Flow Control
·Selectable RTS Flow Control Hysteresis.
·Automatic Software (Xoff/Xon) Flow Control
·Automatic RS-485 2-wire Half-duplex Direction Control to the Transceiver via RTS#
·Full Modem Interface
·Infrared Receive and Transmit Encoder/ decoder
· PowerSave Feature reduces sleep current to 15 µA at 3.3 Volt
· Device Identification
· Crystal or external clock input
· Industrial and Commercial Temperature ranges
· 48 TQFP Package (7 x 7 x 1.0 mm)Application· Portable and Battery Operated Appliances
· Wireless Access Servers
· Ethernet Network Routers
· Cellular Data Devices
· Telecommunication Network Routers
· Factory Automation and Process ControlsPinout
Specifications
| CH |
2 |
| CPUInterface |
Intel or Motorola |
| Data Rate@5/3.3/2.5V |
6.2/4.0/3.0 @8X |
| Tx/RxFIFO(Bytes) |
64/64 |
| Tx/RxFIFOCtrs |
Yes |
| Tx/RxFIFOINT Trig |
Program/ Program |
| AutoRTS/CTS |
Yes |
| IrDaSup |
Yes |
| 5VTolInputs |
Yes |
| Sup V |
2.25-5.5 |
| Pkgs |
TQFP-48 |
Power Supply Range 7 Volts
Voltage at Any Pin GND-0.3 V to 7 V
Operating Temperature -40o to +85
Storage Temperature -65o to +150
Package Dissipation 500 mWDescription
The XR16L2751 UART (Universal Asynchronous Receiver Transmitter) is a dual-channel, 2.25V to 5.5V supply product with 5V tolerant inputs. It has a selectable Intel or Motorola data bus interface, and its pin-out is comparable to the ST16C2550CQ and XR16C2850CM. It has a PowerSave feature in sleep mode; this isolates the data bus interface from other bus activities that could cause a wasteful power drain. The PowerSave feature also eliminates the requirement for external buffers, which can reduce cost and board space.
Several XR16L2751 family features can enable more data byte transfer per interrupt service -- this can lower CPU bandwidth requirements. The programmable TX and RX FIFO interrupt trigger levels, and FIFO counters, further reduce the interrupt service period. Additionally, the automatic hardware (RTS/CTS) and software (Xon/Xoff) flow control (with auto RTS hysteresis) eliminates data loss and re-transmission, which can increase data throughput.
XR16L2751 Data rates of up to 6.125Mbps at 5V, 4Mbps at 3.3V and 3Mbps at 2.5V are supported at 8x sampling clock rate. The device supports on-chip crystal oscillator or external clock inputs. The 2751 is offered in a low profile 48-pin TQFP package in commercial and industrial temperature grade.
For UART technical support or to obtain an IBIS model for this product, please email Exar's UART Technical Support group.
XR16L2751 Data Sheet
