| Number of channels (#) | 8 |
| Technology Family | AC |
| Supply voltage (Min) (V) | 2 |
| Supply voltage (Max) (V) | 6 |
| Input type | Standard CMOS |
| Output type | 3-State |
| Clock Frequency (Max) (MHz) | 100 |
| IOL (Max) (mA) | 24 |
| IOH (Max) (mA) | -24 |
| ICC (Max) (uA) | 40 |
| Features | Balanced outputs, High speed (tpd 10-50ns), Positive input clamp diode |
- 2-V to 6-V VCC Operation
- Inputs Accept Voltages to 6 V
- Max tpd of 8.5 ns at 5 V
- 3-State Outputs Drive Bus Lines Directly
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 VCC through a pullup resistor; the minimum value of the resistor is determined by the current-sinking capability of the driver.
