XR88C681CP28

Product Summary

The XR88C681CP28 is a kind of EXAR Dual Universal Asynchronous Receiver and Transmitter (DUART). It is a data communications device that provides two fully independent full duplex asynchronous communication channels in a single package. The XR88C681CP28 is designed for use in microprocessor based systems and may be used in a polled or interrupt driven environment. The XR88C681CP28 offers a single IC solution for the 8080/85, 8086/88, Z80，Z8000，68xx and 65xx microprocessor families. The DUART is fabricated using advanced two layer metal, with a high performance density EPI/CMOS 1.8. process to provide high performance and low power consumption, and is packaged in a 40 pin PDIP，a 28 pin PDIP, and a 44 pin PLCC. The XR88C681CP28 is widely used in Multimedia Systems, Serial to Parallel/Parallel to Serial Converter and DTE for Modem Communication Systems.

Parametrics

XR88C681CP28 absolute maximum ratings: (1)DC Supply Voltage: 7V; (2)Storage Temperature: -65 to 150℃; (3)All Voltages with respect to Ground: -0.5 to +7V.

Features

XR88C681CP28 features: (1)Two Full Duplex, Independent Channels; (2)Asynchronous Receiver and Transmitter; (3)Quadruple-Buffered Receivers and Dual Buffered Transmitters; (4)Programmable Stop Bits in 1/16 Bit Increments; (5)Internal Bit Rate Generators with More than 23 Bit Rates; (6)Independent Bit Rate Selection for Each Transmitter and Receiver; (7)External Clock Capability; (8)Maximum Bit Rate: 1X Clock - 1Mb/s, 16X Clock - 125kb/s; (9)Normal, AUTOECHO, Local LOOPBACK and Remote LOOPBACK Modes; (10)Multi-function 16 Bit Counter/Timer; (11)Interrupt Output with Eight Maskable Interrupt Conditions; (12)Interrupt Vector Output on Acknowledge (40 Pin DIP and 44 Pin PLCC Packages Only); (13)Programmable Interrupt Daisy Chain; (14)8 General Purpose Outputs (40 Pin DIP and 44 Pin PLCC Packages Only); (15)7 General Purpose Inputs with Change of States Detectors on Inputs (40 Pin DIP and 44 Pin PLCC Packages Only); (16)Multi-Drop Mode Compatible with 8051 Nine Bit Mode; (17)On-Chip Oscillator for Crystal; (18)Standby Mode to Reduce Operating Power; (19)Compatible with the Motorola MC2681 and Signetics SCC2692 devices; (20)Advanced CMOS Low Power Technology.

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