XR16L580 SMALLEST 2.25V TO 5.5V UART WITH 16-BYTE FIFO AND POWERSAVE AUGUST 2011 REV. 1.4.2 FEATURES GENERAL DESCRIPTION Smallest Full Featured UART The XR16L580 (L580) is a 2.25 to 5.5 volt Universal Asynchronous Receiver and Transmitter (UART) with 5 volt 2.25V to 5.5V Supply Voltage tolerant inputs and a reduced pin count. It is pin-to-pin and 5V Tolerant Inputs (except XTAL1) software compatible to industry standard 16C450, 16C550, Intel/Motorola Bus Select ST16C580, ST16C650A and XR16C850 UARTs. It has 16 bytes of TX and RX FIFOs and is capable of operating up to 0 ns Address Hold Time (T and T ) AH ADH serial data rate of 1 Mbps at 2.25 volt supply voltage. The Pin and Software Compatible to industry standard internal registers is compatible to the 16C550 register set 16C450, 16C550, ST16C580, ST16C650A and plus enhanced registers for additional features to support XR16C850 in the 48-TQFP package. todays high bandwidth data communication needs. The enhanced features include Intel or Motorola data bus 16-byte Transmit FIFO interface to match your CPU interface, automatic hardware 16-byte Receive FIFO with Errors Flags and software flow control to prevent data loss, selectable Selectable RX and TX FIFO Trigger Levels RX and TX trigger levels for more efficient interrupt service, wireless infrared (IrDA) encoder/decoder for wireless Automatic Hardware (RTS/CTS) Flow Control applications and a unique Power-Save mode to increase Automatic Software (Xon/Xoff) Flow Control battery operating time. The device comes in the 48-TQFP Up to 3.125 Mbps Data Rate at 5V and 2 Mbps at 3.3V and very small 32-QFN and 24-QFN packages in industrial and 1 Mbps at 2.25V Operation with External Clock Input temperature range. Infrared (IrDA) Encoder/Decoder APPLICATIONS Complete Modem Interface Handheld Terminals and Tablets Power-Save Mode to conserve battery power Handheld Computers Sleep Mode with Wake-up Interrupt Wireless Portable Point-of-Sale Terminals Small packages: 24-QFN (4x4x0.9mm) and 32-QFN Cellular Phones DataPort (5x5x0.9mm) GPS Devices Compatible to standard 48-TQFP packages, without the Personal Digital Assistants Modules following signals: IOR, IOW, CS1, CS2, TXRDY , RXRDY , RCLK, BAUDOUT , OP1 and OP2 Battery Operated Instruments o Industrial Temperature Grade(-40 to +85 C) FIGURE 1. BLOCK DIAGRAM VCC *5 V Tolerant Inputs PwrSave (2.25 to 5.5 V) (Except for XTAL1) A2:A0 GND D7:D0 UART IOR TX, RX, IOW (R/W ) 16 Byte TX FIFO UART RTS , CTS , CS DTR , DSR , Regs IR TX & RX RI , CD ENDEC INT (IRQ ) Intel or Motorola RESET BRG 16 Byte RX FIFO Data Bus (RESET ) Interface 16/68 XTAL1 Crystal Osc/Buffer XTAL2 GNugget BLK Exar Corporation 48720 Kato Road, Fremont CA, 94538 (510) 668-7000 FAX (510) 668-7017 www.exar.com XR16L580 SMALLEST 2.25V TO 5.5V UART WITH 16-BYTE FIFO AND POWERSAVE REV. 1.4.2 FIGURE 2. PACKAGES AND PIN OUT (24, 32-PIN QFN AND 48-TQFP PACKAGES) 18 17 16 15 14 13 18 17 16 15 14 13 VCC 19 12 GND VCC GND 19 12 D0 20 11 IOW D0 20 11 R/W 24-pin QFN in D1 21 24-pin QFN in 10 XTAL2 D1 21 10 XTAL2 Motorola Bus Intel Bus mode D2 22 9 XTAL1 D2 22 9 XTAL1 mode D3 23 8 PwrSv D3 23 8 PwrSv D4 24 7 CS 24 7 D4 CS 12 34 56 12 3456 VCC GND 2423 2423222120191817 222120191817 NC NC DSR 25 16 DSR 25 16 CD 26 15 NC CD 26 15 NC RI RI 27 14 NC 27 14 IOR 32-pin QFN in VCC VCC 28 13 28 32-pin QFN in 13 GND GND Motorola Bus Intel Bus Mode D0 29 12 R/W D0 29 12 IOW Mode 30 D1 XTAL2 30 11 D1 11 XTAL2 31 D2 XTAL1 31 10 D2 10 XTAL1 D3 32 9 PwrSave 32 D3 9 PwrSave 23 4 56 78 1 1 23 4 56 78 GND VCC 36 35 34 33 32 31 30 29 28 27 26 25 36 35 34 33 32 31 30 29 28 27 26 25 NC NC 37 24 NC NC 37 24 23 NC 38 23 NC CTS 38 CTS 22 39 DSR 39 NC DSR 22 NC CD 40 21 NC CD 40 21 NC 20 41 RI 41 NC RI 20 NC 19 42 VCC 42 VCC 19 IOR NC 48-TQFP in 48-TQFP in 43 18 43 18 D0 GND D0 GND Intel Bus Mode Motorola Bus Mode 17 44 D1 44 D1 17 NC NC 45 16 45 16 R/W D2 IOW D2 46 15 46 15 D3 XTAL2 D3 XTAL2 14 47 D4 47 XTAL1 D4 14 XTAL1 NC 48 13 PwrSave NC 48 13 PwrSave 1 2 3 4 5 6 7 8 9 10 11 12 1 2 3 4 5 6 7 8 9 10 11 12 VCC GND 2 16/68 NC D5 RESET D4 CTS Reset 16/68 D6 NC RESET 16/68 INT D5 D7 DTR D5 DTR NC RTS A0 D6 RTS D6 NC NC INT D7 INT A1 RX D7 NC RX A0 TX A2 RX NC A0 TX A1 NC A1 IOR CS A2 TX A2 CS NC NC Reset 16/68 D4 CTS NC 16/68 16/68 IRQ RESET D5 D5 RESET D5 DTR D6 NC A0 D6 D6 D7 DTR RTS D7 NC RTS A1 IRQ D7 NC NC RX A0 A2 RX RX IRQ TX A1 TX NC NC CS TX A2 A0 NC A1 NC A2 CS NC NC