@Adil Malik: use

sky130_fd_io__top_gpiov2

from the

sky130_fd_io

library:

.SUBCKT sky130_fd_io__top_gpiov2 AMUXBUS_A AMUXBUS_B ANALOG_EN ANALOG_POL
+ ANALOG_SEL DM[2] DM[1] DM[0] ENABLE_H ENABLE_INP_H ENABLE_VDDA_H ENABLE_VDDIO
+ ENABLE_VSWITCH_H HLD_H_N HLD_OVR IB_MODE_SEL IN IN_H INP_DIS OE_N OUT PAD
+ PAD_A_ESD_0_H PAD_A_ESD_1_H PAD_A_NOESD_H SLOW TIE_HI_ESD TIE_LO_ESD VCCD VCCHIB
+ VDDA VDDIO VDDIO_Q VSSA VSSD VSSIO VSSIO_Q VSWITCH VTRIP_SEL

with the following voltages applied to the inputs:

AMUXBUS_A          N/C
AMUXBUS_B          N/C
ANALOG_EN          0
ANALOG_POL         0
ANALOG_SEL         0
DM[2]              0
DM[1]              0
DM[0]              0
ENABLE_H           3.3
ENABLE_INP_H       0
ENABLE_VDDA_H      3.3
ENABLE_VDDIO       1.8
ENABLE_VSWITCH_H   0
HLD_H_N            3.3
HLD_OVR            0
IB_MODE_SEL        0
IN                 N/C
IN_H               N/C
INP_DIS            1.8
OE_N               1.8
OUT                0
PAD                (pad signal connection)
PAD_A_ESD_0_H      (core signal connection)
PAD_A_ESD_1_H      N/C
PAD_A_NOESD_H      N/C
SLOW               0
TIE_HI_ESD         N/C
TIE_LO_ESD         N/C
VCCD               1.8
VCCHIB             1.8
VDDA               3.3
VDDIO              3.3
VDDIO_Q            N/C
VSSA               0
VSSD               0
VSSIO              0
VSSIO_Q            N/C
VSWITCH            3.3
VTRIP_SEL          0