xr ST16C654/654D 2.97V TO 5.5V QUAD UART WITH 64-BYTE FIFO AUGUST 2005 REV. 5.0.2 FEATURES GENERAL DESCRIPTION Pin-to-pin compatible with ST16C454, ST16C554 1 The ST16C654/654D (654) is an enhanced quad and TIs TL16C554AFN and TL16C754BFN Universal Asynchronous Receiver and Transmitter Intel or Motorola Data Bus Interface select (UART) each with 64 bytes of transmit and receive FIFOs, transmit and receive FIFO trigger levels, Four independent UART channels automatic hardware and software flow control, and Register Set Compatible to 16C550 data rates of up to 1.5 Mbps. Each UART has a set Data rates of up to 1.5 Mbps of registers that provide the user with operating status 64 Byte Transmit FIFO and control, receiver error indications, and modem 64 Byte Receive FIFO with error tags serial interface controls. Selectable interrupt polarity provides flexibility to meet design requirements. An 4 Selectable TX and RX FIFO Trigger Levels internal loopback capability allows onboard Automatic Hardware (RTS/CTS) Flow Control diagnostics. The 654 is available in 64 pin LQFP, 68 Automatic Software (Xon/Xoff) Flow Control pin PLCC and 100 pin QFP packages. The 64 pin Progammable Xon/Xoff characters package only offers the 16 mode interface, but the 68 Wireless Infrared (IrDA 1.0) Encoder/Decoder and 100 pin packages offer an additional 68 mode Full modem interface interface which allows easy integration with Motorola processors. The ST16C654CQ64 (64 pin) offers 2.97V to 5.5V supply operation three state interrupt output while the Sleep Mode (200 uA typical) ST16C654DCQ64 provides continuous interrupt Crystal oscillator or external clock input output. The 100 pin package provides additional FIFO status outputs (TXRDY and RXRDY A-D), APPLICATIONS separate infrared transmit data outputs (IRTX A-D) and channel C external clock input (CHCCLK). The Portable Appliances ST16C654/654D is compatible with the industry Telecommunication Network Routers standard ST16C454 and ST16C654/554D. Ethernet Network Routers NOTE: 1 Covered by U.S. Patent 5,649,122. Cellular Data Devices Factory Automation and Process Controls FIGURE 1. ST16C654 BLOCK DIAGRAM 2.97V to 5.5V VCC A2:A0 GND D7:D0 UART Channel A IOR 64 Byte TX FIFO UART TXA, RXA, IRTXA, DTRA , IOW Regs IR DSRA , RTSA , CTSA , TX & RX CSA ENDEC CDA , RIA BRG CSB 64 Byte RX FIFO CSC TXB, RXB, IRTXB, DTRB , CSD UART Channel B DSRB , RTSB , CTSB , (same as Channel A) INTA Data Bus CDB , RIB INTB Interface INTC TXC, RXC, IRTXC, DTRC , UART Channel C INTD DSRC , RTSC , CTSC , (same as Channel A) CDC , RIC CHCCLK TXRDY A-D TXD, RXD, IRTXD, DTRD , UART Channel D RXRDY A-D DSRD , RTSD , CTSD , (same as Channel A) Reset CDD , RID 16/68 INTSEL XTAL1 Crystal Osc/Buffer CLKSEL XTAL2 654 BLK Exar Corporation 48720 Kato Road, Fremont CA, 94538 (510) 668-7000 FAX (510) 668-7017 www.exar.com ST16C654/654D xr 2.97V TO 5.5V QUAD UART WITH 64-BYTE FIFO REV. 5.0.2 FIGURE 2. PIN OUT ASSIGNMENT FOR 100-PIN QFP PACKAGES IN 16 AND 68 MODE TXRDYD 81 50 RXRDYC RXRDYD 82 49 CDC CDD 83 48 RIC 84 RID 47 RXC RXD 85 46 GND VCC 86 45 TXRDY INTSEL 87 44 RXRDY ST16C654 RESET D0 88 43 100-pin QFP D1 89 42 CHCCLK Intel Mode D2 90 XTAL2 41 Connect 16/68 pin to VCC D3 91 40 XTAL1 D4 92 39 A0 D5 93 38 A1 D6 94 37 A2 D7 95 36 16/68 GND 96 35 CLKSEL RXA 97 34 RXB RIA 98 33 RIB CDA 99 32 CDB RXRDYA 100 31 RXRDYB TXRDYD 81 RXRDYC 50 RXRDYD 82 49 CDC CDD 83 48 RIC RID 84 47 RXC RXD 85 GND 46 VCC 86 45 TXRDY INTSEL 87 44 RXRDY ST16C654 D0 88 RESET 43 100-pin QFP D1 89 42 CHCCLK Motorola Mode D2 90 41 XTAL2 Connect 16/68 pin to GND D3 91 XTAL1 40 D4 92 39 A0 D5 93 38 A1 D6 94 37 A2 D7 95 36 16/68 GND 96 35 CLKSEL RXA 97 34 RXB 98 RIA 33 RIB CDB CDA 99 32 RXRDYA 100 31 RXRDYB 2 N.C. 1 N.C. 1 80 N.C. 80 N.C. N.C. 2 N.C. 2 79 N.C. 79 N.C. N.C. 3 N.C. 3 78 N.C. 78 N.C. N.C. 4 77 N.C. N.C. 4 77 N.C. TXRDYA 5 76 FSRS TXRDYA 5 76 FSRS IRTXA 6 75 IRTXD IRTXA 6 75 IRTXD DSRA 7 DSRA 7 74 DSRD 74 DSRD 8 8 CTSA 73 CTSD CTSA 73 CTSD DTRA 9 DTRA 9 72 DTRD 72 DTRD VCC 10 VCC 10 71 GND 71 GND RTSA 11 70 RTSD RTSA 11 70 RTSD IRQ 12 69 N.C. INTA 12 69 INTD CSA 13 68 N.C. CSA 13 68 CSD TXA 14 TXA 14 67 TXD 67 TXD R/W 15 IOW 15 66 N.C. 66 IOR TXB 16 TXB 16 65 TXC 65 TXC A3 17 A4 CSB 17 CSC 64 64 N.C. 18 63 N.C. INTB 18 63 INTC RTSB 19 62 RTSC RTSB 19 62 RTSC 20 20 GND 61 VCC GND 61 VCC 21 21 DTRB 60 DTRC DTRB 60 DTRC CTSB 22 CTSB 22 59 CTSC 59 CTSC DSRB 23 DSRB 23 58 DSRC 58 DSRC IRTXB 24 IRTXC IRTXB 24 IRTXC 57 57 TXRDYB 25 56 TXRDYC TXRDYB 25 56 TXRDYC N.C. 26 55 N.C. N.C. 26 55 N.C. N.C. 27 54 N.C. N.C. 27 54 N.C. N.C. 28 N.C. 28 53 N.C. 53 N.C. N.C. 29 N.C. 29 52 N.C. 52 N.C. N.C. 30 N.C. N.C. 30 N.C. 51 51