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SN74ABT32543 Scheda tecnica(PDF) 2 Page - Texas Instruments |
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SN74ABT32543 Scheda tecnica(HTML) 2 Page - Texas Instruments |
2 / 9 page SN54ABT32543, SN74ABT32543 36BIT REGISTERED BUS TRANSCEIVERS WITH 3STATE OUTPUTS SCBS230B − JUNE 1992 − REVISED JULY 1994 5−2 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 POST OFFICE BOX 1443 • HOUSTON, TEXAS 77251−1443 description (continued) The A-to-B enable (CEAB) input must be low in order to enter data from A or to output data from B. If CEAB is low and LEAB is low, the A-to-B latches are transparent; a subsequent low-to-high transition of LEAB puts the A latches in the storage mode. With CEAB and OEAB both low, the 3-state B outputs are active and reflect the data present at the output of the A latches. Data flow from B to A is similar but requires using the CEBA, LEBA, and OEBA inputs. To ensure the high-impedance state during power up or power down, 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. Active bus-hold circuitry is provided to hold unused or floating data inputs at a valid logic level. The SN54ABT32543 is characterized for operation over the full military temperature range of − 55 °C to 125°C. The SN74ABT32543 is characterized for operation from − 40 °C to 85°C. FUNCTION TABLE† (each 18-bit section) INPUTS OUTPUT CEAB LEAB OEAB A OUTPUT B H X X X Z X XH X Z L HL X B0‡ L LL L L L L L H H † A-to-B data flow is shown; B-to-A flow control is the same except that it uses CEBA, LEBA, and OEBA. ‡ Output level before the indicated steady-state input conditions were established. |
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