A four-level pulse amplitude modulation (PAM4) SerDes transmitter for high-speed inter-chip interconnections was designed using a 65 nm CMOS technology. The entire transmitter comprises most significant bit (MSB) channels, least significant bit (LSB) channels, clock generation paths, feedforward equalization modules, and interface drivers. A latchless parallel-to-serial conversion technique is used to minimize power consumption. A fractional feedforward equalization technique is employed to extend the frequency compensation range beyond the Nyquist frequency to enhance the adaptability of the output signal to the channel. Additionally, a 4∶1 parallel-to-serial converter with pre-charge ability is utilized to mitigate the impact of the charge-extraction effects. Simulation results demonstrate that the designed transmitter achieves a 56 Gbit/s PAM4 output signal at a supply voltage of 1 V, a clear output eye image, a high-linearity of the level mismatch ratio (RLM) of 93.1%, an output swing of 480 mV, and a power consumption of 75 mW.