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74LVTH18514DGGRG4 Datasheet(PDF) 11 Page - Texas Instruments |
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74LVTH18514DGGRG4 Datasheet(HTML) 11 Page - Texas Instruments |
11 / 38 page SN54LVTH18514, SN54LVTH182514, SN74LVTH18514, SN74LVTH182514 3.3-V ABT SCAN TEST DEVICES WITH 20-BIT UNIVERSAL BUS TRANSCEIVERS SCBS670C – AUGUST 1996 – REVISED MARCH 1998 11 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 device-identification register The device-identification register (IDR) is 32 bits long. It can be selected and read to identify the manufacturer, part number, and version of this device. For the ’LVTH18514, the binary value 00000000000000111101000000101111 (0003D02F, hex) is captured (during Capture-DR state) in the IDR to identify this device as TI SN54/74LVTH18514. For the ’LVTH182514, the binary value 00000000000000111110000000101111 (0003E02F, hex) is captured (during Capture-DR state) in the IDR to identify this device as TI SN54/74LVTH182514. The IDR order of scan is from TDI through bits 31–0 to TDO. Table 2 shows the IDR bits and their significance. Table 2. Device-Identification Register Configuration IDR BIT NUMBER IDENTIFICATION SIGNIFICANCE IDR BIT NUMBER IDENTIFICATION SIGNIFICANCE IDR BIT NUMBER IDENTIFICATION SIGNIFICANCE† 31 VERSION3 27 PARTNUMBER15 11 MANUFACTURER10† 30 VERSION2 26 PARTNUMBER14 10 MANUFACTURER09† 29 VERSION1 25 PARTNUMBER13 9 MANUFACTURER08† 28 VERSION0 24 PARTNUMBER12 8 MANUFACTURER07† –– –– 23 PARTNUMBER11 7 MANUFACTURER06† –– –– 22 PARTNUMBER10 6 MANUFACTURER05† –– –– 21 PARTNUMBER09 5 MANUFACTURER04† –– –– 20 PARTNUMBER08 4 MANUFACTURER03† –– –– 19 PARTNUMBER07 3 MANUFACTURER02† –– –– 18 PARTNUMBER06 2 MANUFACTURER01† –– –– 17 PARTNUMBER05 1 MANUFACTURER00† –– –– 16 PARTNUMBER04 0 LOGIC1† –– –– 15 PARTNUMBER03 –– –– –– –– 14 PARTNUMBER02 –– –– –– –– 13 PARTNUMBER01 –– –– –– –– 12 PARTNUMBER00 –– –– † Note that for TI products, bits 11–0 of the device-identification register always contain the binary value 000000101111 (02F, hex). |
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