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SN74LVCH16952ADL Datasheet(PDF) 2 Page - Texas Instruments |
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SN74LVCH16952ADL Datasheet(HTML) 2 Page - Texas Instruments |
2 / 14 page www.ti.com DESCRIPTION/ORDERING INFORMATION (CONTINUED) SN74LVCH16952A 16-BIT REGISTERED TRANSCEIVER WITH 3-STATE OUTPUTS SCAS320L – NOVEMBER 1993 – REVISED MARCH 2005 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. Inputs can be driven from either 3.3-V or 5-V devices. This feature allows the use of this device as a translator in a mixed 3.3-V/5-V system environment. This device is fully specified for partial-power-down applications using Ioff. The Ioff circuitry disables the outputs, preventing damaging current backflow through the device when it is powered down. Active bus-hold circuitry is provided to hold unused or floating data inputs at a valid logic level. Use of pullup or pulldown resistors with the bus-hold circuitry is not recommended. The bus-hold circuitry is part of the input circuit and is not disabled by OE or DIR. FUNCTION TABLE(1) INPUTS OUTPUT B CEAB CLKAB OEAB A H X L X B0(2) X L L X B0(2) L ↑ L L L L ↑ L H H X X H X Z (1) A-to-B data flow is shown; B-to-A data flow is similar, but uses CEBA, CLKBA, and OEBA. (2) Level of B before the indicated steady-state input conditions were established 2 |
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