ST16C2450 Datasheet | Exar

DESCRIPTION The ST16C2450 (2450) is a dual universal asynchronous receiver and transmitter (UART). The ST16C2450 is an improved version of the ST16C2450 with lower operating voltage and 5 volt tolerant inputs. The 2450 provides enhanced UART functions, a modem control interface and data rates up to 1.5 Mbps. Onboard status registers provide the user with error indications and operational status. Independent programmable baud rate generators are provided to select transmit and receive clock rates up to 1.5 Mbps. An internal loopback capability allows onboard diagnostics. The 2450 is available in a 44pin PLCC and 48-pin TQFP packages. The 2450 is fabricated in an advanced CMOS process capable of operating from 2.97 volt to 5.5 volt power supply. The devices with a top marking of "A2 YYWW" or newer have 5 volt tolerant inputs. FEATURES Added feature in devices with top marking "A2 YYWW" and newer: s 5 Volt Tolerant Inputs - 2.97 to 5.5 Volt Operation - Pin-to-pin patible to Exar’s ST16C2450, ST16C2550, XR16C2850 TQFP package XR16L2550, XR16L2750 and - Pin-to-pin patible to TI’s TL16C752B on the 48- 2 independent UART channels s Up to 1.5 Mbps data rate with a 24 MHz crystal oscillator or external clock frequency 1 byte Transmit FIFO 1 byte Receive FIFO with error tags Status report registers Modem control signals (CTS#, RTS#, DSR#, DTR#, RI#, CD#) Programmable character lengths (5, 6, 7, 8) with even, odd, or no parity s s s s APPLICATIONS - Portable Appliances - Telemunication Network Routers - Ethernet Network Routers - Cellular Data Devices - Factory Automation and Process Controls s - Crystal oscillator or external clock input - TTL patible inputs, outputs - Industrial temperature ranges - 48-TQFP and 44-PLCC packages FIGURE 1. ST16C2450 BLOCK DIAGRAM A2:A0 D7:D0 IOR# IOW# CSA# CSB# INTA INTB UART Channel A UART Regs 8-bit Data Bus Interface BRG 16 Byte TX FIFO TX & RX 16 Byte RX FIFO 2.25 to 5.5 Volt VCC GND TXA, RXA, DTRA#, DSRA#, RTSA#, DTSA#, CDA#,...