XR16M752/XR68M752 HIGH PERFORMANCE DUART WITH 64-BYTE FIFO JUNE 2009 REV. 1.1.1 FEATURES GENERAL DESCRIPTION 1.62 to 3.6 Volt Operation 1 The XR16M752/XR68M752 (M752) is a high Pin-to-pin and software compatible to TIs performance dual universal asynchronous receiver TL16C752B and Philips SC16C752B in the 48- and transmitter (UART) with 64 byte TX and RX TQFP package FIFOs. The M752 operates from 1.62 to 3.63 volts. It is pin-to-pin and software compatible to the Two independent UART channels TL16C752B and SC16C752B, but with additional Data rate of up to 16 Mbps at 3.3 V features such as a programmable fractional baud rate Data rate of up to 12.5 Mbps at 2.5 V generator, automatic RS-485 half-duplex direction Data rate of up to 8 Mbps at 1.8 V control, infrared mode and 8X and 4X sampling rate. Fractional Baud Rate Generator The standard features include 16 selectable TX and RX FIFO trigger levels, automatic hardware (RTS/ Data sampling rates of 16X, 8X and 4X CTS) and software (Xon/Xoff) flow control, and a Transmit and Receive FIFOs of 64 bytes complete modem interface. Onboard registers Programmable TX and RX FIFO Trigger Levels provide the user with operational status and data Automatic Hardware (RTS/CTS) Flow Control error flags. An internal loopback capability allows Automatic Software (Xon/Xoff) Flow Control system diagnostics. Each channel is independently Halt and Resume Transmission Control programmable for data rates up to 16 Mbps at 3.3V with a 4X sampling rate. The XR68M752 has an Automatic RS-485 Half-duplex Direction additional 16/68 pin to select between the Intel and Control Output via RTS Motorola bus interface. The M752 is available in the Wireless Infrared (IrDA 1.0) Encoder/Decoder 48-pin TQFP, 32-pin QFN and 49-pin STBGA Automatic sleep mode packages. Full modem interface NOTE: 1 Covered by U.S. Patent 5,649,122 Crystal oscillator (up to 24MHz) or external clock APPLICATIONS (up to 64MHz) input 48-TQFP, 32-QFN and 49-STBGA packages Portable Appliances Telecommunication Network Routers Ethernet Network Routers Cellular Data Devices Factory Automation and Process Controls FIGURE 1. XR16M752 BLOCK DIAGRAM 1.62 to 3.63 Volt VCC A2:A0 GND D7:D0 IOR (NC) UART Channel A IOW (R/W ) TXA, RXA, DTRA , 64 Byte TX FIFO CSA (CS ) UART DSRA , RTSA , Regs IR DTSA , CDA , RIA , CSB (A3) TX & RX ENDEC OP2A 8-bit Data INTA (IRQ ) BRG Bus 64 Byte RX FIFO INTB (NC) Interface TXRDYA TXB, RXB, DTRB , TXRDYB UART Channel B DSRB , RTSB , RXRDYA (same as Channel A) CTSB , CDB , RIB , RXRDYB OP2B Reset/Reset XTAL1 Crystal Osc/Buffer XTAL2 16/68 Exar Corporation 48720 Kato Road, Fremont CA, 94538 (510) 668-7000 FAX (510) 668-7017 www.exar.com XR16M752/XR68M752 HIGH PERFORMANCE DUART WITH 64-BYTE FIFO REV. 1.1.1 FIGURE 2. PIN OUT ASSIGNMENT - TQFP AND QFN PACKAGES D5 1 36 RESET D6 2 35 DTRB D7 3 34 DTRA 1 24 RESET 33 D6 RXB 4 RTSA D7 2 23 RTSA 32 OP2A RXA 5 3 22 INTA RXB XR16M752 TXRDYB 6 31 RXRDYA XR16M752 4 21 INTB RXA 48-pin TQFP 32-pin QFN A0 TXA 7 30 INTA TXA 5 20 Intel Mode Only Intel Mode Only 6 19 A1 TXB TXB 8 29 INTB 7 18 A2 CSA 28 OP2B 9 A0 CSB 8 17 NC 27 A1 CSA 10 CSB 11 26 A2 NC 12 25 NC D5 1 36 RESET D6 2 35 DTRB D7 3 34 DTRA 1 24 RESET D6 RXB 4 33 RTSA 2 23 RTSA D7 32 RXA 5 OP2A INTA RXB 3 22 XR68M752 31 TXRDYB 6 RXRDYA XR68M752 4 21 INTB RXA 32-pin QFN 48- pin TQFP 30 INTA 5 20 A0 TXA 7 TXA Intel Mode Intel Mode A1 TXB 6 19 29 INTB TXB 8 7 18 A2 CSA VCC 28 A0 OP2B 9 8 17 16/68 CSB 27 A1 CSA 10 11 26 A2 CSB 12 25 NC NC VCC D5 1 36 RESET D6 2 35 DTRB 3 34 DTRA D7 1 24 RESET D6 D7 2 23 RTSA 33 RXB 4 RTSA 3 22 IRQ RXB 32 RXA 5 OP2A XR68M752 4 21 NC RXA 32-pin QFN XR68M752 TXRDYB 6 31 RXRDYA A0 TXA 5 20 Motorola Mode 48- pin TQFP TXB 6 19 A1 TXA 7 30 IRQ Motorola Mode 7 18 A2 CS 29 TXB 8 NC A3 8 17 16/68 OP2B 9 28 A0 GND CS 10 27 A1 11 26 A2 A3 25 NC 12 NC GND 2 XTAL1 XTAL1 48 D4 13 48 D4 13 XTAL1 48 13 D4 XTAL2 14 47 D3 XTAL2 14 47 D3 XTAL2 14 47 D3 IOW 15 46 D2 IOW 46 D2 15 R/W 15 46 D2 CDB 16 45 D1 CDB 16 45 D1 CDB 16 45 D1 GND 17 44 D0 GND 17 44 D0 GND 17 44 D0 RXRDYB 43 18 TXRDYA RXRDYB 18 43 TXRDYA RXRDYB 18 43 TXRDYA IOR 42 VCC 19 IOR 42 NC 19 VCC 19 42 VCC DSRB 20 41 RIA DSRB 41 RIA DSRB 20 41 RIA 20 RIB 21 40 CDA RIB RIB 21 40 CDA 21 40 CDA RTSB 22 39 DSRA RTSB RTSB 39 22 39 DSRA CTSB 22 DSRA 23 38 CTSA CTSB CTSB NC 23 38 CTSA 23 38 CTSA 24 37 NC 37 16/68 24 NC 16/68 24 37 NC 32 NC 9 32 D5 32 NC 9 D5 NC 9 D5 XTAL1 31 XTAL1 10 31 D4 10 D4 XTAL1 31 D4 10 XTAL2 11 30 D3 XTAL2 11 30 D3 XTAL2 11 30 D3 IOW 12 29 D2 IOW 12 29 D2 R/W 12 29 D2 28 28 28 GND 13 D1 GND 13 D1 GND 13 D1 14 27 D0 IOR 14 27 D0 14 27 D0 IOR NC RTSB 15 26 VCC RTSB 15 26 VCC RTSB 15 26 VCC CTSB 16 25 CTSA CTSB 16 25 CTSA CTSB 16 25 CTSA