The FSA1156 and FSA1157 are high performance SinglePole/Single Throw (SPST) analog switches. The devices feature ultra low R ON of 0.75 \Omega (typical) and will operate over the wide VCC range of 1.65V to 5.5V. The devices are fabricated with sub-micron CMOS technology to achieve fast switching speeds. The select input is TTL level compatible. The FSA1156 has Normally Open operation and the FSA1157 has Normally Closed operation.