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Manufacturer Part #


XR16L2751 Series 6.25 Mbps 5.5 V Dual UART With 64-Byte FIFO & Powersave-TQFP-48

Mfr. Name: MaxLinear
Standard Pkg:
Product Variant Information section
Date Code: 1802
Product Specification Section
Technical Attributes
Attributes Table
Data Rate: 6.25Mbps
No of Functions / Channels: 2
Interface Circuit Type: Parallel
Supply Voltage-Nom: 2.25V to 5.5V
Supply Current: 5mA
Power Dissipation: 0.5W
Clock Frequency-Max: 50MHz
Operating Temperature: -40°C to +85°C
Storage Temperature Range: -65°C to +150°C
Package Style:  TQFP-48
Mounting Method: Surface Mount
Features & Applications

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 device 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.

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.


  • Support data rates up to 6.125Mbps at 5.0V, 4 Mbps at 3.3V, and 3 Mbps at 2.5V
  • Transmit and receive FIFO level counters
  • Automatic Sleep-mode
  • Automatic Xon/Xoff software flow control
  • Data rate up to 6.25 Mbps
  • Infrared (IrDA 1.0) data encoder/decoder
  • Programmable Tx and Rx FIFO trigger levels
  • Automatic RTS/CTS
  • Pb-Free, RoHS Compliant Versions Offered
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Product Variant Information section