The DataSheet of CH315 (the first)

4

transfer.

CH315H support the common type 6N137 single channel high-speed photic coupler (need four) or the

type is HCPL-2630,2631,0630,0631 double channels (only need two). The isolate power is determined by

photic coupler, the typical isolate power is 5000V of 6N137. CH315H also support magnetism coupler,

recommended to use photic coupler, not influenced by the electromagnetism. In order to support 12Mbps

USB full-speed signal, the transfer speed is more than 10Mbps of photic coupler or magnetism coupler.

CH315 is hardware project of USB signal extension and USB signal electric isolation, compatible with

the relative criterion, completely transparent to the USB protocol. For the CH315, no need any drive, but the

USB device may need to install driver, the method is the same with the no isolation. The common USB

Flash Drive, keyboard, mice and other USB device may no need driver.

CH315 can automatically detect USB full-speed and USB low-speed, support plug and play,

automatically detect and simulate the USB device connect and disconnect. CH315G can be used to produce

active USB extension cable, extension USB transmission distance, signal acquisition and on-line remote

control; CH315G can be used to produce optical isolator USB signals and reduce signal interference,

improve signal acquisition accuracy.

6. Parameter

6.1. Absolute maximum rating (Stresses above those listed can cause permanent damage to the device.

Exposure to maximum rated conditions can affect device operation and reliability.)

Name

Parameter note

Min.

Max.

Units

TA

Ambient operating temperature

-40

85

℃

TS

Storage temperature

-55

125

℃

VCC

Voltage source (VCC connects to power, GND to ground)

-0.5

6.0

V

VIO

The voltage of input or output pin

-0.5

VCC+0.5

V

6.2. Electrical parameter (test conditions: TA=25℃, VCC=5V, excluding pin connection of USB bus)

Name

Note of parameter

Min.

Typ.

Max.

Unit

s

VCC

Power voltage

3.2

5

5.3

V

ICCs

Static source current

2

5

mA

ICCa

Source current when working

20

50

mA

VIL

Input Voltage LOW OPIN/N

-0.5

0.8

V

VIH

Input Voltage HIGH OPIP/N

2.0

VCC+0.5

V

VOL

Output Voltage LOW (draw 8mA current) OPOP/N

0.5

V

VOH

Output Voltage HIGH (output 8mA current) OPOP/N

VCC-0.5

V

IUPup

Input current in UP# pin with internal pull-up resistor

3

150

300

uA

IUPact

Input current in ACT# pin with internal pull-up resistor

100

230

400

uA

Lfs

Extension distance of full-speed USB signal

75

m

Lls

Extension distance of low-speed USB signal

300

m

7. Application

7.1. Active USB extension cable (following image)

The following USB extension cable is composed by two groups CH315G circuit.