
November 2008
3
M9999-112008
MIC2551
Micrel, Inc.
SUS
OE#
D+, D–
RCV
VP/VM
Function
00
Driving
Active
Normal transmit mode
01
Receiving
Active
Normal receive mode
10
Hi-Z
0
Not active
Low power state
11
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
VP
VM
D+
D-
RCV
Result
0000
X
SE0
01010
Logic 0
10101
Logic 1
1111
X
Undefined
OE# = 1:
Input
Output
D+
D-
VP
VM
RCV
Result
0000
X
SE0
01010
Logic 0
10101
Logic 1
1111
X
Undefined
X - Undefined
Table 2. Truth Table During Normal Mode