Hot-selling and scarce SCC2692AC1A44 Dual asynchronous receiver/transmitter 44-PLCC spot stock

Product Descriptions

The SCC2692 Dual UniversalAsynchronous Receiver/Transmitter (DUART)which is compatiblewith the SCN2681 . It is a single-chip CMOS-LSI communicationsdevice that provides two full-duplex asynchronous receiver/transmitter channels in a single package . It interfacesdirectly with microprocessors and may be used in a polled orinterrupt driven system .

The operating mode and data format of each channel can beprogrammed independently.Additionally, each receiver andtransmitter can select its operating speed as one of eighteen fixedbaud rates, a 16X clock derived from a programmable counter/timer,or an external 1X or 16X clock . The baud rate generator andcounter/timer can operate directly from a crystal or from externalclock inputs . The ability to independently program the operatingspeed of the receiver and transmitter make the DUART particularlyattractive for dual-speed channel applications such as clusteredterminal systems .

Each receiver is quadruply buffered to minimize the potential ofreceiver over-run or to reduce interrupt overhead in interrupt drivensystems . In addition, a flow control capability is provided to disable aremote DUART transmitter when the receiver buffer is full .

Also provided on the SCC2692 are a multipurpose 7-bit input portand a multipurpose 8-bit output port . These can be used as generalpurpose I/O ports or can be assigned specific functions (such asclock inputs or status/interrupt outputs) under program control .

Product Features

•Dual full-duplex asynchronous receiver/transmitters

•Quadruple buffered receiver data register

•Programmable data format

– 5 to 8 data bits plus parity

– Odd, even, no parity or force parity

–  1, 1.5 or 2 stop bits programmable in 1/16-bit increments

•16-bit programmable Counter/Timer

•Programmable baud rate for each receiver and transmitter selectable from:

– 22 fixed rates: 50 to 115.2k baud

–  Non-standard rates to 115.2Kb

–  Non-standard user-defined rate derived from programmable counter/timer

–  External 1X or 16X clock

•Parity,framing, and overrun error detection

•False start bit detection

•Line break detection and generation

•Programmable channel mode

–  Normal (full-duplex)

– Automatic echo

–  Local  loopback

–  Remote loopback

–  Multidrop mode (also called‘wake-up’ or‘9-bit’)

•Multi-function 7-bit input port

– Can  serve as clock or control inputs

– Change of state detection on four inputs

–  Inputs have typically >100k pull-up resistors

•Multi-function 8-bit output port

–  Individual bit set/reset capability

– Outputs can be programmed to be status/interrupt signals

•Versatile interrupt system

– Single interrupt output with eight maskable interrupting conditions

– Output port can be configured to provide a total of up to six separate wire-ORable interrupt outputs

•Maximum data transfer rates: 1X – 1MB/sec, 16X – 125kB/sec

•Automatic wake-up mode for multidrop applications

•Start-end break interrupt/status

•Detects break which originates in the middle of a character

•On-chip crystal oscillator

•Power down mode

•Receiver timeout mode

•Commercial and industrial temperature range versions

•TTL compatible

•Single +5V power supply

Product Photos

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