**Explanation:**

Digital ICs (Integrated Circuits) are electronic circuits that are used to process and store digital signals. They are designed to work with discrete digital input signals, which have only two possible states: high (1) or low (0). Digital ICs perform various functions such as logic operations, memory storage, and signal amplification.

Digital ICs have several parameters that are specified to characterize their performance and behavior. These parameters help in understanding the limitations and capabilities of the ICs. Some of the commonly specified parameters for digital ICs include gate dissipation, propagation delay, noise margin, and bandwidth.

- **Gate Dissipation**: Gate dissipation refers to the power dissipated by the gates of the digital ICs. It is an important parameter to consider as it determines the power consumption of the IC. Lower gate dissipation is desirable as it leads to reduced power consumption and heat generation.

- **Propagation Delay**: Propagation delay is the time taken for a digital signal to propagate from the input of a gate or circuit to its output. It is an essential parameter as it determines the speed or performance of the IC. Lower propagation delay is desirable as it allows the IC to operate at higher clock speeds and process signals more quickly.

- **Noise Margin**: Noise margin refers to the difference between the minimum input voltage level required to be recognized as a logic high (1) and the maximum input voltage level required to be recognized as a logic low (0). It indicates the tolerance of the IC to noise or variations in the input signal. Higher noise margin is desirable as it improves the immunity of the IC to external disturbances and ensures reliable operation.

- **Bandwidth**: Bandwidth is the range of frequencies over which the IC can operate effectively. It is a parameter commonly specified for analog ICs but not typically specified for digital ICs. Digital ICs are primarily concerned with processing digital signals and are not designed to handle a wide range of frequencies like analog ICs.

Therefore, among the given options, the parameter that is not typically specified for digital ICs is **bandwidth** (option D).