A 22nm 0.26nW/Synapse Spike-Driven Spiking Neural Network Processing Unit Using Time-Step-First Dataflowand Sparsity-Adaptive In-Memory Computing - Ying Liu#; Yufei Ma#; Ninghui Shang; Tianhao Zhao; Chen, Peiyu; Wu, Meng; Ru, Jiayoon; Tianyu Jia; Le Ye*; Zhixuan Wang*; Ru HUANG (IEEE International Solid-State Circuits Conference (ISSCC 2024), 2024)