These octal D-type flip-flops are designed specifically for low-voltage (3.3-V) VCC operation, but with the capability to provide a TTL interface to a 5-V system environment.
The ’LVTH273 devices are positive-edge-triggered flip-flops with a direct-clear input. Information at the data (D) inputs meeting the setup-time requirements is transferred to the Q outputs on the positive-going edge of the clock pulse. Clock triggering occurs at a particular voltage level and is not directly related to the transition time of the positive-going pulse. When the clock (CLK) input is at either the high or low level, the D-input signal has no effect at the output.
Active bus-hold circuitry holds unused or undriven inputs at a valid logic state. Use of pullup or pulldown resistors with the bus-hold circuitry is not recommended.
These devices are fully specified for partial-power-down applications using Ioff. The Ioff circuitry disables the outputs, preventing damaging current backflow through the devices when they are powered down.
Support Mixed-Mode Signal Operation (5-V Input and Output Voltages With 3.3-V VCC)
Typical VOLP (Output Ground Bounce) <0.8 V at VCC = 3.3 V, TA = 25°C
Support Unregulated Battery Operation Down to 2.7 V
Buffered Clock and Direct-Clear Inputs
Individual Data Input to Each Flip-Flop
Ioff Supports Partial-Power-Down-Mode Operation
Bus Hold on Data Inputs Eliminates the Need for External Pullup/Pulldown Resistors