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SN74LVCZ32245AGKER Datasheet(PDF) 2 Page - Texas Instruments |
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SN74LVCZ32245AGKER Datasheet(HTML) 2 Page - Texas Instruments |
2 / 12 page www.ti.com DESCRIPTION/ORDERING INFORMATION (CONTINUED) SN74LVCZ32245A 32-BIT BUS TRANSCEIVER WITH 3-STATE OUTPUTS SCES423 – JANUARY 2003 – REVISED JUNE 2005 This device can be used as four 8-bit transceivers, two 16-bit transceivers, or one 32-bit transceiver. It allows data transmission from the A bus to the B bus or from the B bus to the A bus, depending on the logic level at the direction-control (DIR) input. The output-enable (OE) input can be used to disable the device so that the buses effectively are isolated. Inputs can be driven from either 3.3-V or 5-V devices. This feature allows the use of these devices as translators in a mixed 3.3-V/5-V system environment. When VCC is between 0 and 1.5 V, the device is in the high-impedance state during power up or power down. However, to ensure the high-impedance state above 1.5 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. This device is fully specified for hot-insertion applications using Ioff and power-up 3-state. The Ioff circuitry disables the outputs, preventing damaging current backflow through the device when it is powered down. The power-up 3-state circuitry places the outputs in the high-impedance state during power up and power down, which prevents driver conflict. FUNCTION TABLE (EACH 8-BIT SECTION) INPUTS OPERATION OE DIR L L B data to A bus L H A data to B bus H X Isolation 2 |
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