ST16C650A 2.90V TO 5.5V UART WITH 32-BYTE FIFO JUNE 2010 REV. 5.0.3 FEATURES GENERAL DESCRIPTION Added features in devices with a top mark date code 1 The ST16C650A (650A) is a 2.90 to 5.5 volt ofHC YYW and newer: Universal Asynchronous Receiver and Transmitter 2.90 to 5.5 Volt Operation (UART) with 5 volt tolerant inputs. This device 5 Volt Tolerant Inputs supports Intel and PC ISA mode data bus interfaces and is software compatible to industry standard Automatic RS485 Half-Duplex Control Output 16C450, 16C550, and ST16C580 UARTs. Programmable Infrared Encoder Pulse Width The 650A has 32 bytes of TX and RX FIFOs and is Sleep Mode with Wake-up Indicator capable of operating up to serial data rates of 3.125 Device ID & Revision Mbps at 5 volt supply voltage. The internal registers Up to 3.125 Mbps Data Rate at 5 Volts include the 16C550 register set plus Exars enhanced Added feature in devices with a top mark date code of registers for additional features to support todays I2 YYW and newer: highly demanding data communication needs. The enhanced features include automatic hardware and 0 ns address hold time software flow control, selectable TX and RX trigger Intel or PC Mode 8-bit Bus Interface levels, and wireless infrared (IrDA) encoder/decoder. 32-byte Transmit and Receive FIFOs The device provides a new capability to give user the Automatic Hardware (RTS/CTS) Flow Control ability to program the wireless infrared encoder output pulse width, hence reducing the power Hardware Flow Control Hysteresis consumption of a handheld unit. Automatic Software (Xon/Xoff) Flow Control The ST16C650A device comes in the 44-pin PLCC APPLICATIONS and 48-pin TQFP packages in both the commercial and industrial temperature ranges. Battery Operated Electronics NOTE: 1 Covered by US patents 5,649,122. Handheld Terminal Personal Digital Assistants Cellular Phones DataPort Wireless Infrared Data Communications Systems FIGURE 1. BLOCK DIAGRAM RESET 32 Byte TX FIFO A2:A0 Transmitter TX D7:D0 Infrared Encoder and IOR Pulse Width Control IOR IOW Intel or CTS Flow UART Control PC Data Configuration IOW Bus DTR , DSR , Regs CS2 Interface Modem Control Signals RTS , CTS , CS1 CD , RI RTS Flow CS0 Control Infrared INT Decoder TXRDY Receiver with Auto RDRDY RX Software Flow Control DDIS 32 Byte RX FIFO BRG Prescaler SEL Baud Rate Generator S1 S2 PC Mode: S3 COM 1 to 4 XTAL1/CLK Crystal Osc/Buffer IRQA Decode Logic XTAL2 IRQB IRQC Exar Corporation 48720 Kato Road, Fremont CA, 94538 (510) 668-7000 FAX (510) 668-7017 www.exar.com ST16C650A 2.90V TO 5.5V UART WITH 32-BYTE FIFO REV. 5.0.3 FIGURE 2. INTEL AND PC MODE PIN OUT 48-TQFP PACKAGE 44-PLCC PACKAGE D5 7 39 RESET 1 36 SEL N.C. D6 8 38 OP1 RESET D5 2 35 D7 9 37 DTR OP1 D6 3 34 10 36 RCLK RTS DTR D7 4 33 RX 11 35 OP2 RTS RCLK 5 32 N.C. 12 ST16C650ACJ44 34 SEL OP2 N.C. 6 31 ST16C650ACQ48 Intel Bus Mode (SEL = VCC) TX 13 33 INT Intel Bus Mode (SEL = VCC) INT RX 7 30 14 32 CS0 RXRDY RXRDY TX 8 29 CS1 15 31 A0 A0 CS0 9 28 CS2 16 30 A1 A1 CS1 10 27 BAUDOUT 17 29 A2 A2 -CS2 11 26 N.C. -BAUDOUT 12 25 D5 7 39 RESET N.C. 1 36 SEL D6 8 38 OP1 D5 2 35 RESET D7 9 37 DTR OP1 D6 3 34 10 36 S2 RTS D7 4 33 DTR RX 11 35 S3 S2 5 32 RTS ST16C650ACQ48 S3 A4 12 ST16C650ACJ44 34 SEL A4 6 31 PC Mode (SEL = GND) PC Mode (SEL = GND) RX 7 30 IRQA TX 13 33 IRQA TX 8 29 IRQB 14 32 A5 IRQB A0 A5 9 28 A6 15 31 A0 A6 10 27 A1 A7 16 30 A1 A7 11 26 A2 LPT1 17 29 A2 N.C. LPT1 12 25 ORDERING INFORMATION OPERATING PART NUMBER PACKAGE TEMPERATURE DEVICE STATUS RANGE ST16C650ACJ44 44-Lead PLCC 0C to +70C Active ST16C650ACQ48 48-Lead TQFP 0C to +70C Active ST16C650AIJ44 44-Lead PLCC -40C to +85C Active ST16C650AIQ48 48-Lead TQFP -40C to +85C Active 2 N.C. 13 48 N.C. N.C. 13 48 N.C. XTAL1 47 D4 14 XTAL1 14 47 D4 XTAL2 15 46 D3 XTAL2 46 D3 15 IOW 16 45 D2 IOW 16 45 D2 IOW 17 44 D1 A8 17 44 D1 43 GND 18 D0 GND 18 43 D0 IOR 19 42 VCC 42 IOR 19 VCC IOR 20 41 RI A3 20 41 RI S1 21 40 CD N.C. 21 40 CD 39 LPT2 22 DSR DDIS 22 39 DSR IRQC 23 38 CTS TXRDY 23 38 CTS AEN 24 37 A9 37 AS 24 N.C. XTAL1 18 6 D4 18 6 D4 XTAL1 19 XTAL2 5 D3 XTAL2 19 5 D3 IOW 20 4 D2 IOW 20 4 D2 IOW 21 3 D1 21 3 D1 A8 22 GND 2 D0 GND 22 2 D0 23 1 N.C. N.C. S1 23 1 A9 IOR 24 44 VCC 24 44 VCC IOR IOR 25 43 RI A3 25 43 RI 26 42 CD DDIS LPT2 26 42 CD TXRDY 27 41 DSR 27 IRQC 41 DSR AS 28 40 CTS AEN 28 40 CTS