March 2006

3

M9999-031306

MIC2551A-2.5

Micrel, Inc.

SUS

OE#

D+, D–

RCV

VP/VM

Function

0

0

Driving

Active

Active

Normal transmit mode.

0

1

Receiving

Active

Active

Normal receive mode.

1

0

Hi-Z

0

Not Active

Low power state.

1

1

Hi-Z

0

Active

Receiving during suspend (low power

state) (Note 1)

Note 1. During suspend, VP and VM are active in order to detect out-of-band signaling conditions.

Table 1. Function Selection

OE# = 0:

Input

Output

Result

VP

VM

D+

D–

RCV

0

0

0

0

X

SE0

0

1

0

1

0

Logic 0

1

0

1

0

1

Logic 1

1

1

1

1

X

Undefined

OE# = 1:

Input

Output

Result

D+

D–

VP

VM

RCV

0

0

0

0

X

SE0

0

1

0

1

0

Logic 0

1

0

1

0

1

Logic 1

1

1

1

1

X

Undefined

X - Undefined

Table 2. Truth Table During Normal Mode