SN74AC574 - Octal D-Type Edge-Triggered Flip-Flops with 3-State Outputs

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

The eight flip-flops of the ’AC574 devices are D-type edge-triggered flip-flops. On the positive transition of the clock (CLK) input, the Q outputs are set to the logic levels 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 the increased drive provide the capability to drive bus lines in a bus-organized system without need for interface or pullup components.

OE\ does not affect internal operations of the flip-flop. 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 V_CC through a pullup resistor; the minimum value of the resistor is determined by the current-sinking capability of the driver.

Products containing the "SN74AC574" keyword are: SN74AC574DBR , SN74AC574DBR , SN74AC574DW , SN74AC574DW , SN74AC574DWG4 , SN74AC574DWG4 , SN74AC574DWR , SN74AC574DWR , SN74AC574DWRE4 , SN74AC574DWRG4 , SN74AC574N , SN74AC574N , SN74AC574NE4 , SN74AC574NG4 , SN74AC574NS , SN74AC574NSE4 , SN74AC574NSR , SN74AC574NSR , SN74AC574NSRE4 , SN74AC574NSRG4

• 2-V to 6-V V_CC Operation
• Inputs Accept Voltages to 6 V
• Max t_pd of 8.5 ns at 5 V
• 3-State Outputs Drive Bus Lines Directly