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XR16L2751IM Datasheet(PDF) 1 Page - Exar Corporation |
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XR16L2751IM Datasheet(HTML) 1 Page - Exar Corporation |
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1 / 52 page  Exar Corporation 48720 Kato Road, Fremont CA, 94538 • (510) 668-7000 • FAX (510) 668-7017 • www.exar.com xr XR16L2751 2.25V TO 5.5V DUART WITH 64-BYTE FIFO AND POWERSAVE OCTOBER 2005 REV. 1.2.2 GENERAL DESCRIPTION The XR16L27511 (2751) is a low voltage dual universal asynchronous receiver and transmitter (UART) with 5 Volt tolerant inputs. The device includes 2 additional capabilities over the XR16L2750: Intel and Motorola data bus selection and a “PowerSave” mode to further reduce sleep current to a minimum during sleep mode. The 2751’s register set is compatible to the ST16C2550 and XR16C2850 but with added functions. It supports the Exar’s enhanced features of 64 bytes of TX and RX FIFOs, programmable FIFO trigger level, FIFO level counters, automatic hardware and software flow control, automatic RS-485 half duplex direction control with programmable turn-around delay, and a complete modem interface. Onboard registers provide the user with operational status and data error tags. An internal loopback capability allows onboard diagnostics. Independent programmable baud rate generator is provided in each UART channel to support data rates up to 6.25 Mbps. NOTE: 1 Covered by U.S. Patent #5,649,122 and #5,949,787 APPLICATIONS • Portable and Battery Operated Appliances • Wireless Access Servers • Ethernet Network Routers • Cellular Data Devices • Telecommunication Network Routers • Factory Automation and Process Controls 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) FIGURE 1. XR16L2751 BLOCK DIAGRAM XTAL1 XTAL2 Crystal Osc/Buffer TXA, RXA, DTRA#, DSRA#, RTSA#, DTSA#, CDA#, RIA#, OP2A# Intel or Motorola Data Bus Interface UART Channel A 64 Byte TX FIFO 64 Byte RX FIFO BRG IR ENDEC TX & RX UART Regs 2.25 to 5.5 Volt VCC GND *5 Volt Tolerant Inputs (Except XTAL1) 2751BLK TXB, RXB, DTRB#, DSRB#, RTSB#, CTSB#, CDB#, RIB#, OP2B# UART Channel B (same as Channel A) A2:A0 D7:D0 CSA# (CS#) 16/68# CSB# (A3) INTA (IRQ#) INTB (logic 0) PwrSave IOW# (R/W#) IOR# (VCC) Reset (Reset#) CLKSEL HDCNTL# TXRDYA# TXRDYB# RXRDYA# RXRDYB# |
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