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SN74BCT8244ANT Datasheet(PDF) 2 Page - Texas Instruments |
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SN74BCT8244ANT Datasheet(HTML) 2 Page - Texas Instruments |
2 / 28 page SN54BCT8244A, SN74BCT8244A SCAN TEST DEVICES WITH OCTAL BUFFERS SCBS042E – FEBRUARY 1990 – REVISED JULY 1996 2 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 description (continued) Four dedicated test terminals control the operation of the test circuitry: test data input (TDI), test data output (TDO), test mode select (TMS), and test clock (TCK). Additionally, the test circuitry performs other testing functions such as parallel-signature analysis (PSA) on data inputs and pseudo-random pattern generation (PRPG) from data outputs. All testing and scan operations are synchronized to the TAP interface. The SN54BCT8244A is characterized for operation over the full military temperature range of –55 °C to 125°C. The SN74BCT8244A is characterized for operation from 0 °C to 70°C. FUNCTION TABLE (normal mode, each buffer) INPUTS OUTPUT OE A Y H X Z L LL L H H logic symbol† SCAN ’BCT8244A 23 1A1 1Y1 2 TDI 14 TDI TCK-IN EN1 1 22 1A2 1Y2 3 TMS 12 TMS 13 TCK EN2 24 TCK-OUT 21 1A3 1Y3 4 20 1A4 1Y4 5 19 2A1 2Y1 7 17 2A2 2Y2 8 16 2A3 2Y3 9 15 2A4 2Y4 10 2OE 1OE Φ 1 2 TDO 11 TDO † This symbol is in accordance with ANSI/IEEE Std 91-1984 and IEC Publication 617-12. Pin numbers shown are for the DW, JT, and NT packages. |
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