The DataSheet of CH315 (the first)

2

● automatically detect USB Full-Speed or USB Low-Speed, CH315H offer USB transfer status indication.

● the same chip can be configured as upstream mode and downstream mode, connect to USB-Host and

USB-Device.

● the downstream mode can automatically detect USB device connection and removal, the upstream mode

can automatically simulate USB device connection and removal.

● set impedance matching serial resistor of USB signal, pull-up resistor of USB device port, pull-down

resistor of USB host port.

● set PLL and 12MHz USB clock internal, no need crystal or crystal resonator, the peripheral circuit is

simply.

● set USB signal extension circuit in the CH315G, support category 5 or category 5 unshielded twisted-pair

super, the transfer distance is no less than 75m of 12Mbps full-speed USB signal, the transfer distance is no

less than 300m of 1.5Mbps.

● set current driven circuit of photic coupler in CH315H, support the low-cost 6N137, the photic coupler can

not influenced by electromagnetism.

● only hardware project, real time of USB protocol, no need other drive program, support Windows

98/ME/2000/XP/Vista/Server200X/64bit-Vista and Linux.

● set 3.3V power manostat in the internal. Support 5V power (default) and 3.3V power.

● CH315G adopt SOP-14 lead-free package, CH315H adopt SOP-18 lead-free package, compatible with

RoHS.

3. Package

Package shape Width of plastic

Pitch of pin

Instruction of package

Ordering type

SOP-14

3.9mm 150mil 1.27mm 50mil

Small outline package of 14-pin

CH315G

SOP-18

7.62mm 300mil 1.27mm 50mil

Small outline package of 18-pin

CH315H

4. Pins

CH315G

Pin No.

CH315H

Pin No.

Pin

Name

Pin Type

Pin Description

3,9

13,16

VCC

POWER

Positive power input port, requires an external 0.1uF

power decoupling capacitance

2,6

8,17,18

GND

POWER

Public ground, ground connection for USB

14

3

V3

POWER

Attachment of VCC input external power while

3.3V;connects of 0.01uF decoupling capacitance outside

while 5V

13

1

UD+

USB signal

Directly connect to USB bus D+ data bus