SN74BCT574

八路 D 类边沿触发器

These 8-bit flip-flops feature 3-state outputs designed specifically for driving highly capacitive or relatively low-impedance loads. They are particularly suitable for implementing buffer registers, I/O ports, bidirectional bus drivers, and working registers.

The eight flip-flops of the ’BCT574 devices are edge-triggered D-type flip-flops. On the positive transition of the clock CLK input, the Q outputs are set to the logic levels that were set up at the data D inputs.

A buffered output-enable OE\ input can be used to place the eight outputs in either a normal logic state high or low logic levels or the high-impedance state. In the high-impedance state, the outputs neither load nor drive the bus lines significantly. The high-impedance state and increased drive provide the capability to drive bus lines without interface or pullup components.

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.

OE\ does not affect internal operations of the flip-flops. Old data can be retained or new data can be entered while the outputs are in the high-impedance state.

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Operating Voltage Range of 4.5 V to 5.5 V

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State-of-the-Art BiCMOS Design Significantly Reduces ICCZ

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Full Parallel Access for Loading

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ESD Protection Exceeds JESD 22

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2000-V Human-Body Model A114-A

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200-V Machine Model A115-A

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1000-V Charged-Device Model C101