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SN74F657NT Datasheet(PDF) 2 Page - Texas Instruments |
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SN74F657NT Datasheet(HTML) 2 Page - Texas Instruments |
2 / 11 page SN74F657 OCTAL TRANSCEIVER WITH PARITY GENERATOR/CHECKER AND 3-STATE OUTPUTS SDFS027A – D3217, JANUARY 1989 – REVISED OCTOBER 1993 2–2 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 FUNCTION TABLE NUMBER OF A OR B INPUTS INPUT/OUTPUT OUTPUTS INPUTS THAT ARE HIGH OE T/R ODD/EVEN PARITY ERR OUTPUT MODE L H H H Z Transmit L HL L Z Transmit 02468 L LH H H Receive 0, 2, 4, 6, 8 L LH L L Receive L LL H L Receive L LL L H Receive L H H L Z Transmit L HL H Z Transmit 1357 L LH H L Receive 1, 3, 5, 7 L LH L H Receive L LL H H Receive L LL L L Receive Don’t care H X X Z Z Z logic symbol† B2 22 B3 21 B4 20 B5 17 B6 16 B1 23 OE T/R 3 EN1/3G5 [REC] 1 A2 3 A3 4 A4 5 A5 6 A6 8 A7 9 A8 10 B7 15 B8 14 ODD/EVEN 3 EN2 [XMIT] 1 2 2 k 5 4, 2 4, 1 ERR Z11 1 G3 24 N4 11 11 A1 2 12 13 14 15 16 17 18 PARITY 13 12 † This symbol is in accordance with ANSI/IEEE Std 91-1984 and IEC Publication 617-12. |
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