Isolation cells

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Isolation cells are additional cells inserted by the synthesis tools for isolating the buses/wires crossing from power-gated domain of a circuit to its always-on domain (AON).

To prevent corruption of always-on domain, we clamp the nets crossing the power domains to a value depending upon the design.

A simple circuit having a switchable (or gated) power domain

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The circuit shown in Figure 1, after isolation cells are inserted

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Always-On Buffer

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reference

Isolation cells and Level Shifter cells URL: https://vlsitutorials.com/isolation-cells-level-shifter-cells-low-power-vlsi/