XR16V2551 Datasheet | Exar

FEATURE GENERAL DESCRIPTION The XR16V25511 (V2551) is a high performance dual universal asynchronous receiver and transmitter (UART) with 16 byte TX and RX FIFOs. The device operates from 2.25 to 3.6 volts with 5 Volt tolerant inputs and is pin-to-pin patible to Exar’s XR16V2651 and XR16L2551. The device includes 2 additional capabilities over the XR16V2550: Intel and Motorola data bus selection and a “Power Save” mode to further reduce sleep current to a minimum during sleep mode. It supports Exar’s enhanced features of selectable FIFO trigger level, automatic hardware (RTS/CTS) and software flow control, and a plete modem interface. An internal loopback capability allows system diagnostics. Independent programmable fractional baud rate generators are provided in each channel to select data rates up to 16 Mbps at 3.3 Volt and 4X sampling clock. The V2551 is available in 48-pin TQFP and 32-pin QFN packages. NOTE: 1 Covered by U.S. Patent #5,649,122 FEATURES - 2.25 to 3.6 Volt Operation - 5 Volt Tolerant Inputs - Pin-to-pin patible to Exar’s XR16V2651 and the XR16L2551 - Two independent UART channels - - Register set identical to 16V2550 Data rate of up to 16 Mbps at 3.3 V, and 12.5 Mbps at 2.5 V with 4X sampling rate Fractional Baud Rate Generator Transmit and Receive FIFOs of 16 bytes Selectable TX and RX FIFO Trigger Levels Automatic Hardware (RTS/CTS) Flow Control Automatic Software (Xon/Xoff) Flow Control Wireless Infrared (Ir DA 1.0) Encoder/Decoder Automatic sleep mode with wake-up interrupt Full modem interface - - - - - - - - APPLICATIONS - Portable Appliances - Telemunication Network Routers - Ethernet Network Routers - Cellular Data Devices - Factory Automation and Process Controls FIGURE 1. XR16V2551 BLOCK DIAGRAM - Power Save Feature reduces sleep current to 15 µA - Device Identification and Revision - Crystal oscillator (up to 32MHz) or external clock (up to 64MHz) input - 48-TQFP and 32-QFN packages Pwr Save A2:A0 D7:D0 IOR# (VCC) IOW# (R/W#)...