SN74AUP1G79_17 Datasheet, PDF (15/45 Pages) Texas Instruments – SN74AUP1G79 Low-Power Single Positive-Edge-Triggered D-Type Flip-Flop

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8 Detailed Description
SN74AUP1G79
SCES592I – JULY 2004 – REVISED SEPTEMBER 2017
8.1 Overview
The SN74AUP1G79 is a single positive-edge-triggered D-type flip-flop. Data at the input (D) is transferred to the
output (Q) on the positive-going edge of the clock pulse when the setup time requirement is met. Because the
clock triggering occurs at a voltage level, it is not directly related to the rise time of the clock pulse. This allows
for data at the input to be changed without affecting the level at the output, following the hold-time interval.
8.2 Functional Block Diagram
CLK
D
CLK
Q
Q
D
Figure 5. Logic Diagram (Positive Logic)
8.3 Feature Description
8.3.1 Balanced CMOS Push-Pull Outputs
A balanced output allows the device to sink and source similar currents. The drive capability of this device may
create fast edges into light loads so routing and load conditions should be considered to prevent ringing.
Additionally, the outputs of this device are capable of driving larger currents than the device can sustain without
being damaged. It is important for the power output of the device to be limited to avoid damage due to over-
current. The electrical and thermal limits defined the in the Absolute Maximum Ratings must be followed at all
times.
8.3.2 Standard CMOS Inputs
Standard CMOS inputs are high impedance and are typically modelled as a resistor in parallel with the input
capacitance given in the Electrical Characteristics: T_A = 25°C. The worst case resistance is calculated with the
maximum input voltage, given in the Absolute Maximum Ratings, and the maximum input leakage current, given
in the Electrical Characteristics: T_A = 25°C, using ohm's law (R = V ÷ I).
Signals applied to the inputs need to have fast edge rates, as defined by Δt/Δv in Recommended Operating
Conditions to avoid excessive currents and oscillations. If a slow or noisy input signal is required, a device with a
Schmitt-trigger input should be used to condition the input signal prior to the standard CMOS input.
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