CX28331/CX28332/CX28333
1.0 Pin Description
Single/Dual/Triple E3/DS3/STS-1 Line Interface Unit
1.1 Pin Assignments
Table 1-2. CX2833i-3x Pin Definitions (6 of 8)
Pin #
Signal Name
Description
I/O/P
Notes
CX28331-3x CX28332-3x CX28333-3x
10
—
—
—
16
—
—
—
19
—
—
—
75
—
100
20
—
—
6
—
100
10
20
—
6
TVSS
TVSS1
TVSS2
TVSS3
RVDD
RVDD1
RVDD2
RVDD3
RVSS
TX ground Ch1
P
Ground pins for transmit circuitry per
channel.
TX ground Ch2
TX ground Ch3
RX power Ch1
P
P
P
Power pins for receive circuitry per channel
(3.3 V).
26
—
—
9
16
26
—
9
RX power Ch2
RX power Ch3
RX ground Ch1
P
P
P
Connect to 3.3 V power.
Ground pins for receive circuitry per
channel.
RVSS1
RVSS2
RVSS3
DVDDC
29
—
75
19
29
75
RX ground Ch2
RX ground Ch3
P
P
P
Connect to ground.
Digital core
power
Digital core power for all channels (3.3 V).
51
98
51
98
51
98
DVSSC
VGG
Digital core
ground
P
P
Digital core ground for all channels.
5 V/3.3 V ESD
pin (1)
5 V supply for 5 V-tolerant, digital pad ESD
diodes. No static power is drawn from pin.
92
33
92
92
33
—
—
DVDDIO
DVSSIO
VDD
Digital I/O power
Digital ground
Power
P
P
P
P
Connect to 3.3 V digital power.
Digital ground.
33
5, 6, 25, 26
15, 16
10, 19
Connect to 3.3 V power.
Connect to ground.
9, 20, 29,
100
VSS
Ground
Miscellaneous
73
—
—
—
95
30
—
95
73
PD
PD1
PD2
Power down for
Ch1
I
Power down transceiver channel
0 = Power down channel (off)
1 = Channel active (on)
Power down for
Ch2
I
I
Note: A special power-down mode exists
when all three PDBs are set low. This
special mode shuts off the entire chip
(including biasing). This is useful for static
Idd testing.
—
—
30
PD3
Power down for
Ch3
100985A
Conexant
1-19
CONEXANT [ CONEXANT SYSTEMS, INC ]
