SN74ABT574A - Octal Edge-Triggered D-Type 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. They are particularly suitable for implementing buffer registers, I/O ports, bidirectional bus drivers, and working registers.

The eight flip-flops of the SN54ABT574 and SN74ABT574A 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 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 increased drive provide the capability to drive bus lines without need for 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 V_CC through a pullup resistor; the minimum value of the resistor is determined by the current-sinking capability of the driver.

This device is fully specified for partial-power-down applications using I_off. The I_off circuitry disables the outputs, preventing damaging current backflow through the device when it is powered down.

Products containing the "SN74ABT574A" keyword are: SN74ABT574ADBR , SN74ABT574ADBR , SN74ABT574ADBR AB574A , SN74ABT574ADBRG4 , SN74ABT574ADW , SN74ABT574ADW , SN74ABT574ADWR , SN74ABT574ADWR , SN74ABT574ADWRE4 , SN74ABT574ADWRE4 , SN74ABT574ADWRG4 , SN74ABT574AGQNR , SN74ABT574AGQNR , SN74ABT574AN , SN74ABT574AN , SN74ABT574ANE4 , SN74ABT574ANE4 , SN74ABT574ANG4 , SN74ABT574ANS , SN74ABT574ANSE4

• Typical V_OLP (Output Ground Bounce)
     <1 V at V_CC = 5 V, T_A = 25°C
• High-Drive Outputs (–32-mA I_OH, 64-mA I_OL)
• I_off Supports Partial-Power-Down Mode Operation
• Latch-Up Performance Exceeds 500 mA Per JEDEC Standard JESD 17
• ESD Protection Exceeds JESD 22
  • 2000-V Human-Body Model (A114-A)
  • 200-V Machine Model (A115-A)