SN74HCT574DWR

These octal edge-triggered D-type flip-flops feature 3-state outputs designed specifically for bus driving. The ’HCT574 devices are particularly suitable for implementing buffer registers, I/O ports, bidirectional bus drivers, and working registers. The eight flip-flops enter data on the low-to-high transition of the clock (CLK) input. A buffered output-enable (overline{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. 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.

Applications

• Buffer register implementation
• I/O port implementation
• Bidirectional bus driver implementation
• Working register implementation

Key features

• Operating Voltage Range of 4.5 V to 5.5 V
• High-Current 3-State Noninverting Outputs Drive Bus Lines Directly or Up To 15 LSTTL Loads
• Low Power Consumption, 80 μA Max ICC
• Typical t_pd=22ns
• ±6 - mA Output Drive at 5 V
• Low Input Current of 1 μA Max
• Inputs Are TTL-Voltage Compatible Bus-Structured Pinout