Overview

CH9374B is a USB KVM controller with built-in 4 upstream USB device ports, 4 downstream USB host ports, 1 PS2 host port and switch control signals. It supports up to 4 PCs to share a set of keyboard, mouse, speaker, microphone and monitor. The PC is connected to devices through USB ports. Plug-and-play, no driver installation required. Easy to use. The downstream USB host ports can connect PC to USB-HID devices, such as USB keyboard/mouse, as well as to some commonly used non-USB-HID devices, such as USB flash disks, printers, cameras, etc. The following figure is a general application block diagram.

Features

• Operating voltage: 5V, 3.3V.
• Crystal: 24MHZ. Supports built-in crystal oscillator. Up to 48MHZ system clock frequency.
• Low-speed (1.5Mbps) and full-speed (12Mbps) USB transfer modes. USB V2.0 compliant.
• Streamlined peripherals. Only power decoupling capacitors are needed.
• Supports Win98/ME/2K/XP/2003/Vista/Win7/Linux/macOS and other operating systems.
• The downstream USB host ports support mixed insertion of USB keyboard and USB mouse.
• Supports PS2 keyboard. Reserved Bluetooth keyboard, Bluetooth mouse communication interface.
• Single-key round-robin switch, multi-key designated switch, keyboard hotkey switch, and mouse hotkey switch.
• Infrared remote control switch.
• Automatic round-robin switch mode, which is convenient for monitoring. The switching time interval can be set by hotkey.
• Automatic detection mode can be enabled/disabled, to detect plug/unplug automatic intelligent switch.
• Buzzer sound can be turned on/off.
• Supports hotkeys all on/off.
• LED indicators, indicating the currently selected PC.
• 4 groups of different keyboard switch hotkeys, can be switched arbitrarily and saved when power off.
• DC-DC boost function.
• Online firmware upgrade.
• LQFP-64 lead-free package, compatible with RoHS.