SN54AS856, SN74AS8568-BIT UNIVERSAL TRANSCEIVER PORT CONTROLLERS

SDAS032A - DECEMBER 1983 - REVISED MARCH 1985

features

Package Options Include Plastic Small Outline Packages, Both Plastic and Ceramic Chip Carriers, and Standard Plastic and Ceramic 300-mil DIPs
Buffered 3-State Outputs Drive Bus Lines Directly
Cascadable to n-Bits
Eight Selectable Transceiver/Port Functions: - B to A - Register to A and/or B - Off-Line Shifts (A and B Ports in High-Impedance State) - Shifted to A and/or B
Particularly Suitable for Use in Diagnostics Analysis Circuitry
Serial Register Provides: - Parallel Storage of Either A or B input Data - Serial Transmission of Data from Either A or B Port - Readback Mode B to A
Dependable Texas Instruments Quality and Reliability

description

The 'AS856 features two 8-bit I/O ports (A1-A8 and B1-B8), an 8-bit parallel-load, serial-in, parallel-out shift register, and control logic. With these features, this device is capable of performing eight selectable transceiver or port functions, depending on the state of the three control lines OEA\, OEB\, and MODE. These functions include: transferring data from port A to port B or vice versa (i.e., the transceiver function), serial shifting data to either or both ports, and performing off-line shifts (with A and B ports active as transceivers in a high-impedance state).

Synchronous parallel loading of the internal register can be accomplished from either port on the positive transition of the clock while serially shifting data in via the SERIN input. The 'AS856 is ideally suited for applications needing signature-analysis circuitry to enhance system verification and/or fault analysis. All serial data is shifted right. All outputs are buffer-type outputs designed specifically to drive bus lines directly and all are 3-state except for Q8, which is a totem-pole output.

The SN54AS856 is characterized for operation over the full military temperature range of -55°C to 125°C. The SN74AS856 is characterized for operation from 0°C to 70°C

Title: 8-BIT UNIVERSAL TRANSCEIVER PORT CONTROLLER
Product Family: UNIVERSAL BUS TRANSCEIVERS (UBTS)
Device Functionality: 8-BIT UNIVERSAL TRANSCEIVER PORT CONTROLLER
Orderable Devices: SN74AS856DW, SN74AS856NT

View the complete PDF datasheet: sdas032a.pdf (117 K Bytes) (Requires Acrobat Reader 3.x)

View more information about generic part numbers:SN74AS856

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