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SCN2675TC4N, SCN2677, SCN2681

Table of contents:
Info of SCN2675TC4N
Info of SCN2677
Info of SCN2681

SCN2675TC4N, SCN2677, SCN2681 Selling Leads, Datasheet

MFG:PHILIPS Package Cooled:NULL D/C:92+

SCN2675TC4N, SCN2677, SCN2681 Datasheet download

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Part Number: SCN2675TC4N

MFG: PHILIPS

Package Cooled: NULL

D/C: 92+

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SCN2681 General Description

The Philips Semiconductors SCN2681 Dual Universal Asynchronous Receiver/Transmitter (DUART) is a single-chip MOS-LSI communications device that provides two independent full-duplex asynchronous receiver/transmitter channels in a single package. It interfaces directly with microprocessors and may be used in a polled or interrupt driven system.

The operating mode and data format of each channel can be programmed independently. Additionally, each receiver and transmitter can select its operating speed as one of eighteen fixed baud rates, a 16X clock derived from a programmable counter/timer, or an external 1X or 16X clock. The baud rate generator and counter/timer can operate directly from a crystal or from external clock inputs. The ability to independently program the operating speed of the receiver and transmitter make the DUART particularly attractive for dual-speed channel applications such as clustered terminal systems.

Each receiver is quadruply buffered to minimize the potential of receiver over-run or to reduce interrupt overhead in interrupt driven systems. In addition, a flow control capability is provided to disable a remote DUART transmitter when the buffer of the receiving device is full.

Also provided on the SCN2681 are a multipurpose 7-bit input port and a multipurpose 8-bit output port. These can be used as general purpose I/O ports or can be assigned specific functions (such as clock inputs or status/interrupt outputs) under program control.

The SCN2681 is available in three package versions: 40-pin and 28-pin, both 0.6" wide DIPs; a compact 24-pin 0.4" wide DIP; a 44-pin PLCC.

SCN2681 Maximum Ratings

SYMBOL	PARAMETER	RATING	UNIT
T_A	Operating ambient temperature range²	See Note 4
T_STG	Storage temperature range	-65 to +150
	All voltages with respect to ground³	-0.5 to +6.0	V

SCN2681 Features

Dual full-duplex asynchronous receiver/transmitter
Quadruple buffered receiver data registers
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
Programmable baud rate for each receiver and transmitter selectable from:
¤ 22 fixed rates: 50 to 115.2k baud
16-bit programmable Counter/Timer
¤ Non-standard rates to 115.2Kb
¤ One user-defined rate derived from programmable timer/counter
¤ 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
Multi-function programmable 16-bit counter/timer
Multi-function 7-bit input port
¤ Can serve as clock or control inputs
¤ Change of state detection on four inputs
¤ 100k typical pull-up resistor
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 interruptingconditions
¤ Output port can be configured to provide a total of up to six separate wire-ORable interrupt outputs
Maximum data transfer: 1X -1MB/sec, 16X-25kB/s
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
Single +5V power supply
Commercial and industrial temperature ranges available
DIP and PLCC packages

SCN2681 Connection Diagram

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