SN74HC374

具有三态输出的八路边沿 D 类触发器

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 \x92HC374 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.

An output-enable OE input places 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.

OE does not affect the 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.

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.

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Wide Operating Voltage Range of 2 V to 6 V

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High-Current 3-State True Outputs Can

Drive Up To 15 LSTTL Loads

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Eight D-Type Flip-Flops in a Single Package

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Full Parallel Access for Loading

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Low Power Consumption, 80-µA Max ICC

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Typical tpd = 14 ns

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±6-mA Output Drive at 5 V

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Low Input Current of 1 µA Max