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74ALVCH16973DLG4 Datasheet(PDF) 2 Page - Texas Instruments |
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74ALVCH16973DLG4 Datasheet(HTML) 2 Page - Texas Instruments |
2 / 13 page www.ti.com DESCRIPTION/ORDERING INFORMATION (CONTINUED) SN74ALVCH16973 8-BIT BUS TRANSCEIVER AND TRANSPARENT D-TYPE LATCH WITH FOUR INDEPENDENT BUFFERS SCES435B – APRIL 2003 – REVISED SEPTEMBER 2004 When the latch-enable (LE) input is high, the Q outputs follow the data (A) inputs. When LE is taken low, the Q outputs are latched at the levels set up at the A inputs. The latch output-enable (LOE) input can be used to place the nine Q outputs in either a normal logic state (high or low logic level) or the high-impedance state. In the high-impedance state, the Q outputs neither drive nor load the bus lines significantly. LOE does not affect internal operations of the latch. Old data can be retained or new data can be entered while the Q outputs are in the high-impedance state. To ensure the high-impedance state during power up or power down, LOE and TOE should be tied to VCC through pullup resistors; the minimum values of the resistors are determined by the current-sinking capability of the drivers. The four independent noninverting buffers perform the Boolean function Y = D and are independent of the state of DIR, TOE, LE, and LOE. The A and B I/Os and D inputs have bus-hold circuitry. Active bus-hold circuitry holds unused or undriven data inputs at a valid logic state. Use of pullup or pulldown resistors with the bus-hold circuitry is not recommended. FUNCTION TABLES INPUTS OPERATION TOE DIR L L B data to A bus L H A data to B bus A bus and B bus H X isolation INPUTS OUTPUT Q LOE LE A L H H H L H L L L L X Q0 H X X Z INPUT OUTPUT D Y L L H H 2 |
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