XR16M554/554D 1.62V TO 3.63V QUAD UART WITH 16-BYTE FIFO MAY 2008 REV. 1.0.0 FEATURES GENERAL DESCRIPTION Pin-to-pin compatible with ST16C454, ST16C554, The XR16M554 (M554) is a quad Universal TIs TL16C554A and NXPs SC16C554B Asynchronous Receiver and Transmitter (UART) with 16 bytes of transmit and receive FIFOs, selectable Intel or Motorola Data Bus Interface select receive FIFO trigger levels and data rates of up to 4 Four independent UART channels Mbps at 3.3 V. Each UART has a set of registers that provide the user with operating status and control, Register Set Compatible to 16C550 receiver error indications, and modem serial interface Data rates of up to 4 Mbps at 3.3 V, 3.125 controls. An internal loopback capability allows Mbps at 2.5 V and 2 Mbps at 1.8 V onboard diagnostics. The M554 is available in a 48- 16 byte Transmit FIFO pin QFN, 64-pin LQFP, 68-pin PLCC and 80-pin 16 byte Receive FIFO with error tags LQFP packages. The 64-pin and 80-pin packages only offer the 16 mode interface, but the 48- and 68- 4 Selectable RX FIFO Trigger Levels pin packages offer an additional 68 mode interface Full modem interface which allows easy integration with Motorola 1.62V to 3.63V supply operation processors. The XR16M554IV (64-pin) offers three state interrupt output while the XR16M554DIV Crystal oscillator or external clock input provides continuous interrupt output. The XR16M554 APPLICATIONS is compatible with the industry standard ST16C554. Portable Appliances Telecommunication Network Routers Ethernet Network Routers Cellular Data Devices Factory Automation and Process Controls FIGURE 1. XR16M554 BLOCK DIAGRAM 1.62 V to 3.6 V VCC A2:A0 GND D7:D0 UART Channel A IOR 16 Byte TX FIFO UART TXA, RXA, DTRA , IOW Regs DSRA , RTSA , CTSA , TX & RX CSA CDA , RIA BRG CSB 16 Byte RX FIFO CSC TXB, RXB, DTRB , CSD UART Channel B DSRB , RTSB , CTSB , (same as Channel A) INTA Data Bus CDB , RIB Interface INTB INTC TXC, RXC, DTRC , UART Channel C DSRC , RTSC , CTSC , (same as Channel A) INTD CDC , RIC TXRDY A-D TXD, RXD, DTRD , RXRDY A-D UART Channel D DSRD , RTSD , CTSD , (same as Channel A) Reset CDD , RID 16/68 XTAL1 Crystal Osc Buffer INTSEL / XTAL2 554BLK Exar Corporation 48720 Kato Road, Fremont CA, 94538 (510) 668-7000 FAX (510) 668-7017 www.exar.com XR16M554/554D 1.62V TO 3.63V QUAD UART WITH 16-BYTE FIFO REV. 1.0.0 FIGURE 2. PIN OUT ASSIGNMENT FOR 68-PIN PLCC PACKAGES IN 16 AND 68 MODE AND 64-PIN LQFP PACKAGES DSRA 10 60 DSRD DSRA 10 60 DSRD CTSA 11 59 CTSD CTSA 11 59 CTSD DTRA 12 58 DTRD DTRA 12 58 DTRD VCC 13 57 GND VCC 13 57 GND RTSA 14 56 RTSD RTSA 14 56 RTSD IRQ 15 55 N.C. INTA 15 55 INTD CS 16 54 N.C. CSA 16 54 CSD XR16M554 XR16M554 TXA 17 53 TXD TXA 17 53 TXD 68-pin PLCC 68-pin PLCC R/W 18 52 N.C. IOW 18 52 IOR Motorola Mode Intel Mode TXB 19 51 TXC 19 TXB 51 TXC (16/68 pin connected to GND) (16/68 pin connected to VCC) A3 20 50 A4 20 50 CSB CSC N.C. 21 49 N.C. INTB 21 49 INTC RTSB 22 48 RTSC RTSB 22 48 RTSC GND 23 47 VCC GND 23 47 VCC DTRB 24 46 DTRC DTRB 24 46 DTRC CTSB 25 45 CTSC CTSB 25 45 CTSC DSRB 26 44 DSRC DSRB 26 44 DSRC DSRA 1 48 DSRD CTSA 2 47 CTSD DTRA 3 46 DTRD VCC 4 45 GND RTSA 5 44 RTSD INTA 6 43 INTD CSA 7 42 CSD XR16M554/554D TXA 8 64-pin TQFP 41 TXD IOW 9 Intel Mode Only 40 IOR TXB 10 39 TXC CSB 11 38 CSC INTB 12 37 INTC 13 36 RTSC RTSB GND 14 35 VCC DTRB 15 34 DTRC CTSB 16 33 CTSC 2 CDB 27 9 CDA RIB 28 8 RIA RXB 29 7 RXA VCC 30 6 GND 16/68 31 5 D7 A2 32 4 D6 A1 33 3 D5 A0 34 2 D4 XTAL1 35 1 D3 XTAL2 36 68 D2 RESET 37 67 D1 RXRDY 38 66 D0 TXRDY 39 65 INTSEL GND 40 64 VCC DSRB 17 64 CDA RXC 41 63 RXD RIA CDB 18 63 RIC 42 62 RID RIB 19 62 RXA CDC 43 63 CDD RXB 20 61 GND VCC 21 60 D7 A2 22 59 D6 A1 58 D5 23 A0 24 57 D4 XTAL1 25 56 D3 XTAL2 26 55 D2 RESET 27 54 D1 CDB 27 9 CDA GND 28 53 D0 RIA RIB 28 8 RXC 29 52 VCC RXB 29 7 RXA RIC 30 51 RXD VCC 30 6 GND CDC 31 50 RID 16/68 31 5 D7 DSRC 32 49 CDD A2 32 4 D6 A1 33 3 D5 A0 34 2 D4 D3 XTAL1 35 1 XTAL2 D2 36 68 RESET 37 67 D1 RXRDY 38 66 D0 TXRDY 39 65 GND GND 40 64 VCC RXC 41 63 RXD RIC 42 62 RID CDC 43 63 CDD