XR16M2550 HIGH PERFORMANCE LOW VOLTAGE DUART WITH 16-BYTE FIFO MAY 2007 REV. 1.0.2 FEATURES GENERAL DESCRIPTION 1.62 to 3.63 Volt Operation 1 The XR16M2550 (M2550) is a high performance dual universal asynchronous receiver and transmitter Pin-to-pin and software compatible to ST16C2550 (UART) with 16 bytes TX and RX FIFOs. The device in the 48-TQFP package operates from 1.62 to 3.63 volts and is pin-to-pin and Pin-to-pin and software compatible to XR16L2550 software compatible to the ST16C2550, XR16L2550, and XR16V2550 and XR16V2550. It supports Exars enhanced features of selectable FIFO trigger level, automatic Two independent UART channels hardware (RTS/CTS) and software flow control, and a Register set is 16550 compatible complete modem interface. Onboard registers Data rate of up to 16 Mbps at 3.3 V provide the user with operational status and data Data rate of up to 12.5 Mbps at 2.5 V error flags. An internal loopback capability allows system diagnostics. Independent programmable Data rate of up to 8 Mbps at 1.8V baud rate generators are provided in each channel to Fractional Baud Rate Generator select data rates up to 16 Mbps at 3.3 Volt with 4X Transmit and Receive FIFOs of 16 bytes sampling clock. The M2550 is available in 48-pin Selectable TX and RX FIFO Trigger Levels TQFP and 32-pin QFN packages. Automatic Hardware (RTS/CTS) Flow Control NOTE: 1 Covered by U.S. Patent 5,649,122 Automatic Software (Xon/Xoff) Flow Control APPLICATIONS Wireless Infrared (IrDA 1.0) Encoder/Decoder Portable Appliances Automatic sleep mode Telecommunication Network Routers Full modem interface Ethernet Network Routers Device Identification and Revision Cellular Data Devices Crystal oscillator (up to 24MHz) or external clock (up to 64MHz) input Factory Automation and Process Controls 48-TQFP and 32-QFN packages FIGURE 1. XR16M2550 BLOCK DIAGRAM 1.62 to 3.63 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 XR16M2550 HIGH PERFORMANCE LOW VOLTAGE DUART WITH 16-BYTE FIFO REV. 1.0.2 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 XR16M2550 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 XR16M2550 4 21 INTB RXA 32-pin QFN 5 20 A0 TXA TXB 6 19 A1 A2 7 18 CSA 8 CSB 17 NC ORDERING INFORMATION PART NUMBER PACKAGE OPERATING TEMPERATURE RANGE DEVICE STATUS XR16M2550IL32 32-Pin QFN -40C to +85C Active XR16M2550IM48 48-Lead TQFP -40C to +85C Active 2 XTAL1 13 48 D4 XTAL2 47 D3 14 32 NC 9 D5 IOW 15 46 D2 XTAL1 31 D4 10 CDB 16 45 D1 XTAL2 11 30 D3 GND 17 44 D0 IOW 12 29 D2 RXRDYB 18 43 TXRDYA 28 IOR 42 GND 13 19 VCC D1 DSRB 20 41 RIA IOR 14 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