XR16V2550 HIGH PERFORMANCE DUART WITH 16-BYTE FIFO JULY 2012 REV. 1.0.3 FEATURES GENERAL DESCRIPTION 2.25 to 3.6 Volt Operation 1 The XR16V2550 (V2550) is a high performance dual universal asynchronous receiver and transmitter 5 Volt Tolerant Inputs (UART) with 16 bytes TX and RX FIFOs. The device Pin-to-pin compatible to ST16C2550, XR16C2550 operates from 2.25 to 3.6 volts with 5 Volt tolerant and XR16L2550 in the 48-TQFP package inputs and is pin-to-pin compatible to Exars ST16C2550 and XR16C2550. The V2550 register set Two independent UART channels is compatible to the ST16C2550 and the XR16L2550. Register set compatible to XR16L2550 It supports Exars enhanced features of selectable Data rate of up to 16 Mbps at 3.3 V, and 12.5 FIFO trigger level, automatic hardware (RTS/CTS) Mbps at 2.5 V with 4X sampling rate and software flow control, and a complete modem Fractional Baud Rate Generator interface. Onboard registers provide the user with operational status and data error flags. An internal Transmit and Receive FIFOs of 16 bytes loopback capability allows system diagnostics. Selectable TX and RX FIFO Trigger Levels Independent programmable baud rate generators are Automatic Hardware (RTS/CTS) Flow Control provided in each channel to select data rates up to 16 Automatic Software (Xon/Xoff) Flow Control Mbps at 3.3 Volt with 4X sampling clock. The V2550 is available in 48-pin TQFP and 32-pin QFN Wireless Infrared (IrDA 1.0) Encoder/Decoder packages. Automatic sleep mode NOTE: 1 Covered by U.S. Patent 5,649,122 Full modem interface APPLICATIONS Device Identification and Revision Portable Appliances Crystal oscillator (up to 32MHz) or external clock (up to 64MHz) input Telecommunication Network Routers 48-TQFP and 32-QFN packages Ethernet Network Routers Cellular Data Devices Factory Automation and Process Controls FIGURE 1. XR16V2550 BLOCK DIAGRAM * 5 Volt Tolerant Inputs 2.25 to 3.6 Volt VCC A2:A0 GND D7:D0 IOR UART Channel A IOW TXA, RXA, DTRA , 16 Byte TX FIFO CSA UART DSRA , RTSA , Regs IR DTSA , CDA , RIA , CSB TX & RX ENDEC OP2A 8-bit Data INTA BRG Bus 16 Byte RX FIFO INTB Interface TXRDYA TXB, RXB, DTRB , TXRDYB UART Channel B DSRB , RTSB , RXRDYA (same as Channel A) CTSB , CDB , RIB , RXRDYB OP2B Reset XTAL1 Crystal Osc/Buffer XTAL2 Exar Corporation 48720 Kato Road, Fremont CA, 94538 (510) 668-7000 FAX (510) 668-7017 www.exar.com XR16V2550 HIGH PERFORMANCE DUART WITH 16-BYTE FIFO REV. 1.0.3 FIGURE 2. PIN OUT ASSIGNMENT 1 36 RESET D5 DTRB D6 2 35 D7 3 34 DTRA RXB 4 33 RTSA RXA 5 32 OP2A XR16V2550 TXRDYB 6 31 RXRDYA 48-pin TQFP 7 30 INTA TXA TXB 8 29 INTB OP2B 9 28 A0 CSA 10 27 A1 CSB 11 26 A2 NC NC 12 25 1 24 RESET D6 2 23 RTSA D7 3 22 INTA RXB XR16V2550 4 21 INTB RXA 32-pin QFN 20 A0 5 TXA TXB 6 19 A1 A2 7 18 CSA 8 CSB 17 NC ORDERING INFORMATION PART NUMBER PACKAGE OPERATING TEMPERATURE RANGE DEVICE STATUS XR16V2550IL-F 32-QFN -40C to +85C Active XR16V2550ILTR-F 32-QFN -40C to +85C Active XR16V2550IM-F 48-Lead TQFP -40C to +85C Active XR16V2550IMTR-F 48-Lead TQFP -40C to +85C Active NOTE: TR = Tape and Reel, F = Green / RoHS 2 XTAL1 13 48 D4 XTAL2 47 14 D3 32 NC 9 D5 IOW 15 46 D2 XTAL1 31 D4 10 CDB 16 45 D1 XTAL2 11 30 D3 GND 17 44 D0 RXRDYB IOW 12 29 D2 18 43 TXRDYA 28 IOR 42 GND 13 D1 19 VCC DSRB 20 41 RIA 14 IOR 27 D0 RIB 21 40 CDA RTSB 15 26 VCC RTSB 22 39 DSRA CTSB 16 25 CTSA CTSB 38 23 CTSA NC 24 37 NC