REF11REF22VSSB3CLKB14CLKB25S26S37VDDB8VSSB9CLKB310CLKB411VDDB12VDDC13XIN14XOUT15FAIL#/SAFE16VDDA17CLKA418CLKA319VSSA20VDDA21S422S123CLKA224CLKA125VSSA26FBK27REFSEL28