CX28331-1X CONEXANT [Conexant Systems, Inc], CX28331-1X Datasheet - Page 20

• Manufacturer Part Number: CX28331-1X
• Description: Single/Dual/Triple E3/DS3/STS-1 Line Interface Unit
• Manufacturer: CONEXANT [Conexant Systems, Inc]

1.0 Pin Description
1.1 Pin Assignments
Table 1-1. CX2833i-1x Pin Definitions (6 of 6)
1-10
2, 3, 6, 7, 18,
NOTE(S):
(1)
(2)
3. All digital input pins contain a 75 k pull-down resistor from input to DVSS.
CX28331-1x CX28332-1x CX28333-1x
4, 5, 20, 21
1, 8, 17, 24
19, 22, 23,
25, 26, 27,
29, 30, 31,
32, 33, 34,
35, 36, 37,
38, 39, 40,
42, 61, 62,
63, 64, 65,
66, 67, 68,
69, 70, 71,
72, 74, 75,
This pin should be connected to 3.3 V in an all-3.3 V design.
Placing a capacitor from this pin to ground may result in instabilities.
58
—
—
—
47
—
—
—
80
78
77
76
10, 11, 14,
15, 42,
12, 13
44–58
Pin #
9, 16
—
76
25
—
—
65
36
—
80
78
77
—
—
—
76
58
25
—
65
47
36
80
78
77
42
Signal Name
REFCLK1
REFCLK2
REFCLK3
REFCLK
RBIAS
Reset
VDD
GPD
VSS
PD1
PD2
PD3
PD
NC
Miscellaneous
Conexant
Power
Ground
Power down for Ch1
Power down for Ch2
Power down for Ch3
Reference clock for Ch1
Reference clock for Ch2
Reference clock for Ch3
Bias resistor
Reset
Global Power down
No connect
Description
Single/Dual/Triple E3/DS3/STS-1 Line Interface Unit
I/O/P
I/O
I/O
—
P
P
O
I
I
I
I
I
I
Connect to 3.3 V power.
Connect to ground.
Power down transceiver channel
0 = Power down channel (off)
1 = Channel active (on)
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.
Reference clock from off-chip.
This clock should be set to one of
the following:
The clock rate should correspond to
the mode of operation that has been
chosen for the channel.
A 12.1 k ± 1% resistor tied from
this pin to ground provides the
current reference to the entire
chip.
Asynchronous reset (reset entire
device).
Power down (Static Idd testing).
Not connected.
CX28331/CX28332/CX28333
0 = Power down disable
1 = Power down active
•
•
•
(2)
E3 rate (34.368 MHz)
DS3 rate (44.736 MHz)
STS-1 rate (51.84 MHz)
Notes
100985A