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SN74ABT657ADBR Datasheet(PDF) 2 Page - Texas Instruments |
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SN74ABT657ADBR Datasheet(HTML) 2 Page - Texas Instruments |
2 / 13 page SN54ABT657A, SN74ABT657A OCTAL TRANSCEIVERS WITH PARITY GENERATORS/CHECKERS AND 3-STATE OUTPUTS SCBS192E – JANUARY 1991 – REVISED JUNE 1997 2 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 description (continued) When VCC is between 0 and 2.1 V, the device is in the high-impedance state during power up or power down. However, to ensure the high-impedance state above 2.1 V, OE should be tied to VCC through a pullup resistor; the minimum value of the resistor is determined by the current-sinking capability of the driver. The SN54ABT657A is characterized for operation over the full military temperature range of –55 °C to 125°C. The SN74ABT657A is characterized for operation from –40 °C to 85°C. FUNCTION TABLE NUMBER OF A OR B INPUTS I/O 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 |
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