The 34 Ohm on-resistance is the series resistance each switch adds when closed. The 150 pC charge injection is the charge dumped into the channel when the switch toggles; it matters most when switching into a high-impedance sample-and-hold or a precision ADC front-end. A 1 nF hold capacitor sees a 150 mV glitch from that charge — something to budget for in the acquisition chain.
Supply range and temperature grade — where it lives on the board
The single-supply range of 2.3 V to 5.5 V covers 5 V logic families without a separate analog rail.