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16C2850 Dataheets PDF



Part Number 16C2850
Manufacturers Exar Corporation
Logo Exar Corporation
Description DUAL UART WITH 128-byte FIFOs AND RS-485 HALF DUPLEX CONTROL
Datasheet 16C2850 Datasheet16C2850 Datasheet (PDF)

Preliminary Information DUAL UART WITH 128-byte FIFO’s AND RS-485 HALF DUPLEX CONTROL XR16C2850 DESCRIPTION The XR16C2850 (2850) is a dual universal asynchronous receiver and transmitter (UART). The 2850 provides enhanced UART functions with 128 byte FIFO, automatic RS-485 half duplex control, a modem control interface, and data rates up to 1.5 Mbps. Onboard status registers provide the user with error indications and operational status. System interrupts and modem control features may be tai.

  16C2850   16C2850



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Preliminary Information DUAL UART WITH 128-byte FIFO’s AND RS-485 HALF DUPLEX CONTROL XR16C2850 DESCRIPTION The XR16C2850 (2850) is a dual universal asynchronous receiver and transmitter (UART). The 2850 provides enhanced UART functions with 128 byte FIFO, automatic RS-485 half duplex control, a modem control interface, and data rates up to 1.5 Mbps. Onboard status registers provide the user with error indications and operational status. System interrupts and modem control features may be tailored by external software to meet specific user requirements. An internal loopback capability allows onboard diagnostics. Independent programmable baud rate generators are provided to select transmit and receive clock rates up to 1.5 Mbps. The baud rate generator can be configured for either crystal or external clock input. The 2850 is available in a 40-pin PDIP, 44-pin PLCC, and 48-pin TQFP packages. The 40 pin package does not offer TXRDY and RXRDY pins (DMA Signal monitoring). Otherwise the three package versions are the same. The 2850 is functionally compatible with the ST16C2550. The 2850 is fabricated in an advanced CMOS process to achieve low drain power and high speed requirements. FEATURES • Pin and functionally compatible to ST16C2550, software compatible with INS8250, NS16C550 • 1.5 Mbps transmit/receive operation (24 MHz Max.). • 128 byte transmit FIFO to reduce bandwidth requirement of the external CPU. • 128 byte receive FIFO with error flags to reduce bandwidth requirement of the external CPU. • Independent transmit and receive UART control. • RS-485 half duplex control. • Programmable transmit/receive FIFO trigger levels. • Hardware / software flow control. • Selectable RTS flow control hysterisis. • Modem control signals (-CTS, -RTS, -DSR, -DTR, -RI, -CD, and software controllable line break). • Programmable character lengths (5, 6, 7, 8) with even, odd, or no parity. • Infrared receive and transmit encoder/decoder. • Device identification. • Crystal or external clock input. • 460.8 Kbps transmit/receive operation with 7.3728 MHz crystal or external clock source. PLCC Package -TXRDYA -DSRA 41 -CTSA 40 -CDA 42 VCC 44 D5 D6 D7 RXB RXA -TXRDYB TXA TXB -OPB -CSA -CSB 7 8 9 10 11 12 13 14 15 16 17 XTAL1 18 XTAL2 19 -IOW 20 -CDB 21 GND 22 -RXRDYB 23 -IOR 24 -DSRB 25 -RIB 26 -RTSB 27 -CTSB 28 43 6 5 4 3 2 1 -RIA D4 D3 D2 D1 D0 39 38 37 36 35 RESET -DTRB -DTRA -RTSA -OPA -RXRDYA INTA INTB A0 A1 A2 XR16C2850CJ 34 33 32 31 30 29 ORDERING INFORMATION Part number XR16C2850CP XR16C2850CJ XR16C2850CM 40 44 48 Pins Package PDIP PLCC TQFP Operating temperature 0° C to + 70° C 0° C to + 70° C 0° C to + 70° C Part number XR16C2850IP XR16C2850IJ XR16C2850IM 40 44 48 Pins Package PDIP PLCC TQFP Operating temperature -40° C to + 85° C -40° C to + 85° C -40° C to + 85° C Rev. 1.00P EXAR Corporation, 48720 Kato Road, Fremont, CA 94538 • (510) 668-7000 • FAX (510) 668-7017 XR16C2850 Figure 1, Package Descriptions, 40 pin, 4.


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