The MAX3421E USB peripheral/host controller contains the digital logic and analog circuitry necessary to implement a full-speed USB peripheral or a full-/low- speed host compliant to USB specification rev 2.0.
The MAX3421E is a USB peripheral/host controller that provides a full‑speed USB peripheral and full/low‑speed host compliant with USB specification rev 2.0. It includes an integrated transceiver with +15 kV ESD protection, programmable USB connect/disconnect, and an internal serial interface engine that handles low‑level USB protocol tasks.
The device is accessed via a 3‑ or 4‑wire SPI interface that can run up to 26 MHz and supports system voltages from 1.4 V to 3.6 V. It offers eight general‑purpose inputs and eight outputs, multiple FIFO buffers, and a range of registers for both peripheral and host operation. The MAX3421E is supplied in 32‑pin TQFP and TQFN packages and operates from –40 °C to +85 °C.
| Operating Temperature Range | -40 °C to +85 °C |
|---|---|
| SPI Clock Frequency | up to 26 MHz |
| Supply Voltage (V_) | 1.4 V to 3.6 V |
| Package Types | 32‑pin TQFP (5 mm × 5 mm) and 32‑pin TQFN (6 mm × 5 mm) |
| General‑Purpose I/O | 8 inputs, 8 outputs |
| USB Speed Support (Peripheral) | Full‑Speed 12 Mbps |
| USB Speed Support (Host) | Full‑Speed 12 Mbps, Low‑Speed 1.5 Mbps |
| ESD Protection | +15 kV on D+, D‑, and VBCOMP |
The device operates with a supply voltage (V_) from 1.4 V to 3.6 V.
The SPI interface can be clocked up to 26 MHz.
It provides eight general‑purpose inputs and eight general‑purpose outputs.
In host mode it supports Full‑Speed 12 Mbps and Low‑Speed 1.5 Mbps.