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SN74ABT8245DWE4 Arkusz danych(PDF) 4 Page - Texas Instruments |
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SN74ABT8245DWE4 Arkusz danych(HTML) 4 Page - Texas Instruments |
4 / 30 page SN54ABT8245, SN74ABT8245 SCAN TEST DEVICES WITH OCTAL BUS TRANSCEIVERS SCBS124D – AUGUST 1992 – REVISED DECEMBER 1996 4 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 Terminal Functions TERMINAL NAME DESCRIPTION A1 – A8 Normal-function A-bus I/O ports. See function table for normal-mode logic. B1 – B8 Normal-function B-bus I/O ports. See function table for normal-mode logic. DIR Normal-function direction-control input. See function table for normal-mode logic. GND Ground OE Normal-function output-enable input. See function table for normal-mode logic. TCK Test clock. One of four terminals required by IEEE Standard 1149.1-1990. Test operations of the device are synchronous to TCK. Data is captured on the rising edge of TCK and outputs change on the falling edge of TCK. TDI Test data input. One of four terminals required by IEEE Standard 1149.1-1990. TDI is the serial input for shifting data through the instruction register or selected data register. An internal pullup forces TDI to a high level if left unconnected. TDO Test data output. One of four terminals required by IEEE Standard 1149.1-1990. TDO is the serial output for shifting data through the instruction register or selected data register. TMS Test mode select. One of four terminals required by IEEE Standard 1149.1-1990. TMS input directs the device through its TAP controller states. An internal pullup forces TMS to a high level if left unconnected. VCC Supply voltage |
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