TI SN74AC534DWR

The SN74AC534 is an octal edge-triggered D-type flip-flop with 3-state outputs. These 8-channel edge-triggered D-type flip-flops feature 3-state outputs specifically designed to drive highly capacitive or relatively low-impedance loads. These devices are particularly suited for implementing buffer registers, I/O ports, bidirectional bus drivers, and working registers. On the positive-going transition of the clock (CLK) input, the inverting Q outputs are set to the complement of the logic levels present at the data (D) inputs. The buffered output enable (OE) input can be used to place all eight outputs in either a normal logic state (high or low logic level) or a high-impedance state. In the high-impedance state, the outputs neither load nor drive the bus lines significantly. The high-impedance state and enhanced drive capability allow this device to drive bus lines without interface or pull-up components. The output enable does not affect the internal operation of the flip-flops; while the outputs are in the high-impedance state, old data can be retained or new data can be entered. To ensure the high-impedance state during power-up or power-down, OE should be connected to VCC through a pull-up resistor; the minimum value of the resistor is determined by the current-sinking capability of the driver.

• Operating voltage range: 2 V to 6 V VCC
• Input voltage up to 6 V
• Maximum tpd of 11 ns at 5 V
• 3-state inverting outputs for direct bus driving
• Full parallel load access supported

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