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SN74ABT8543DW 数据表(PDF) 4 Page - Texas Instruments |
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SN74ABT8543DW 数据表(HTML) 4 Page - Texas Instruments |
4 / 31 page SN54ABT8543, SN74ABT8543 SCAN TEST DEVICES WITH OCTAL REGISTERED BUS TRANSCEIVERS SCBS120E – AUGUST 1991 – REVISED JULY 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. CEAB, CEBA Normal-function chip-enable inputs. See function table for normal-mode logic. GND Ground LEAB, LEBA Normal-function latch-enable inputs. See function table for normal-mode logic. OEAB, OEBA Normal-function output-enable inputs. 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 directs the device through its TAP controller states. An internal pullup forces TMS to a high level if left unconnected. VCC Supply voltage |
类似零件编号 - SN74ABT8543DW |
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类似说明 - SN74ABT8543DW |
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