The MAX3344E and MAX3345E are bidirectional USB transceivers that convert logic‑level signals to USB signals and vice‑versa. They feature an internal 1.5 kΩ pull‑up resistor, USB detect functionality, and +15 kV ESD protection on the USB I/O pins. The devices operate from a low logic supply (VL) as low as 1.65 V and support full‑speed (12 Mbps) USB 1.1/2.0 operation.
Key specifications include a supply voltage range of –0.3 V to +6 V, VL input range of 1.65 V to 3.6 V, USB detect thresholds of 3.6‑4 V for MAX3344E and 1‑2.8 V for MAX3345E, and a suspend mode current below 40 µA. The transceivers are offered in 4×4 UCSP and 16‑pin TSSOP packages and meet stringent ESD standards (+15 kV human‑body model).
| Supply Voltage (Vcc) range | -0.3 V to +6 V |
|---|---|
| VL Input Range | 1.65 V to 3.60 V |
| USB_DET threshold (MAX3344E) | 3.6 V (min) to 4 V (max) |
| USB_DET threshold (MAX3345E) | 1 V (min) to 2.8 V (max) |
| ESD protection rating | +15 kV on D+ and D- |
| Suspend mode supply current | < 40 µA |
The MAX3344E USB_DET threshold is between 3.6 V (minimum) and 4 V (maximum).
The MAX3345E USB_DET threshold is between 1 V (minimum) and 2.8 V (maximum).
The VL input range is 1.65 V to 3.60 V.
In suspend mode the device draws less than 40 µA of supply current.
The transceiver provides +15 kV ESD protection on the D+ and D- pins.