The MAX4508/MAX4509 are 8-to-1 and dual 4-to-1 fault-protected multiplexers that are pin compatible with the industry-standard DG508/DG509. The MAX4508/ MAX4509 operate with dual supplies of ±4.5V to ±20V or a single supply of +9V to +36V. These multiplexers feature fault-protected inputs, rail-to-rail signal handling capability, and overvoltage clamping at 150mV beyond the rails. Both parts offer ±40V overvoltage protection with supplies off and ±25V protection with supplies on. On-resistance is 400Ω max and is matched between channels to 15Ω max. All digital inputs have TTL logic thresholds, ensuring both TTL and CMOS logic compatibility when using a single +12V supply or dual ±15V supplies.
The MAX4508 and MAX4509 are fault‑protected analog multiplexers that provide high‑voltage operation. They are pin‑compatible with DG508/DG509 and support dual supplies of ±4.5 V to ±20 V or a single supply of +9 V to +36 V. The devices feature rail‑to‑rail signal handling, TTL/CMOS‑compatible inputs, and over‑voltage clamping beyond the supply rails.
Key characteristics include a maximum on‑resistance of 400 Ω, ±40 V over‑voltage protection when supplies are off, and ±25 V protection when supplies are on. Detailed electrical specifications, typical operating curves, pin descriptions, and ordering information are provided throughout the document.
| Supply Voltage Range (dual) | ±4.5 V to ±20 V |
|---|---|
| Supply Voltage Range (single) | +9 V to +36 V |
| Maximum On‑Resistance | 400 Ω |
| Over‑Voltage Protection (supplies off) | ±40 V |
| Over‑Voltage Protection (supplies on) | ±25 V |
| Input Logic Thresholds | TTL compatible |
| Operating Temperature Range (MAX4508C_E) | 0 °C to +70 °C |
The MAX4508/MAX4509 provide ±40 V over‑voltage protection when the supplies are off.
The maximum on‑resistance is 400 Ω.
They can operate from dual supplies of ±4.5 V to ±20 V or a single supply of +9 V to +36 V.
Yes, all digital inputs have TTL logic thresholds, making them TTL compatible.