GL650USB View Datasheet(PDF) - Genesys Logic

Part Name

Description

Manufacturer

GL650USB

USB 4 PORT HUB CONTROLLER

Genesys Logic 

A

4

3

2

1

A

B

C

D

Rev.

Description

1.0

1. First Product Release

Date

'00/04/05

1.1

1. Seperate 4-port and 7-port hubs into different schematic files.

2. Omit the ganged mode pull-up resistor on 'SUSPND' pin.

3. Add a 10K pull-up resistor to 'RESET' pin.

4. Connect pin 1 of U2 to B_VCC, then regulator will be enabled

only when upstream port is plugged!

A 1M pull-low resistor is also added to disable this pin when

the upstream port is not plugged.

5. 'SELF' is directly connected to drain of Q4 to omit the external

debounce RC circuit for this pin.

6. Q1 is replaced by a more popular and cheaper one -- FDN340P.

7. Some resistor values are increased to save the operating current.

'00/05/18

1.2

1. Change the pull-up voltage source for each LED from B_VCC to power

switch output.

'00/08/17

2. Remove the 47U output capacitor of MIC29302 to suppress inrush current.

3. Add R1, R2 and C6 for EMI suppressing.

4. Change C10, C15, C18 and C23 from 100U to 120U for better behavior in

droop test.

5. Add a 2-transistor circuit for regulator ENABLE pin. That will save

several tens of mA operating current than direct connecting B_VCC

to ENABLE pin.

6. Remove a redudant transistor in SELF-BUS power switching circuit.

E

4

3

2

1

Title

CIRCUIT FOR GENESYS 4-PORT USB HUB

Size

B

Document Number

USBHUB.DSN

Rev

1.2

Date:

Thursday, August 17, 2000

Sheet

3

of 3

B

C

D

E

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