LTM2884C View Datasheet(PDF) - Linear Technology

Part Name

Description

MFG CO.

LTM2884C

Isolated USB Transceiver with Isolated Power

Linear Technology 

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LTM2884

Functional Table

USB Transceiver Functional Table

MODE

Full Speed (Idle)

Low Speed (Idle)

Disconnected (Idle)

Suspend (Idle >3ms)

Suspend No Power

(Idle >3ms)

D1 to D2 Data

D2 to D1 Data

D1+

1.5k Pull-Up

Host Pull-Down

Host Pull-Down

Set at Device Connect

Set at Device Connect

IN+

OUT+

D1–

Host Pull-Down

1.5k Pull-Up

Host Pull-Down

Set at Device Connect

Set at Device Connect

IN–

OUT–

AUTOMATIC PULL-UP

CONNECTION

D1+

D1–

None

Set at Device Connect

Set at Device Connect

Set at Device Connect

Set at Device Connect

D2+

Peripheral Pull-Up

15k Pull-Down

15k Pull-Down

Peripheral or 15k

15k Pull-Down

D2–

SPNDPWR

15k Pull-Down

X

Peripheral Pull-Up

X

15k Pull-Down

X

Peripheral or 15k

0

15k Pull-Down

3.3V

OUT+

IN+

OUT–

X

IN–

X

Power Functional Table

MODE

Off

On

On, Suspend (Idle >3ms)

On, Suspend (Idle >3ms), Power Off

On, USB Transceiver Only Power Off

ON

SPNDPWR

VCC

VBUS

DC/DC CONVERTER

0

X

X

X

OFF

3.3V

X

>4.4V

>4.4V

ON

3.3V

0

>4.4V

>4.4V

ON

3.3V

3.3V

>4.4V

>4.4V

OFF

3.3V

X

0

>4.4V

OFF

2884f

12

For more information www.linear.com/LTM2884

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