CX28331-1X CONEXANT [Conexant Systems, Inc], CX28331-1X Datasheet - Page 11

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

100985A
1.0 Pin Description
1.1 Pin Assignments
Figures 1-1
pin assignments for the 80-pin Exposed Thin Quad Flat Package (ETQFP). See
Table 1-1
illustrate pin assignments for the 100-pin ETQFP. The 100-pin package adds
more functionality, supporting new features such as Transmit Monitoring and
Transmit Monitoring Status testing. See
descriptions.
NOTE:
receive and transmit analog circuitry powers down. Analog inputs (RLINE) are
ignored and analog outputs (TLINE) are high impedance. Digital inputs of a
powered-down channel are still active, but ignored. Overall noise on the device
can be lowered by not driving the digital inputs of a powered-down channel.
NOTE:
Figures 1-4
The input/output (I/O) column is coded as follows:
I = Input
O = Output
I/O = Bidirectional
P = Power
When a channel is disabled (i.e., the PDx pin is tied low or not connected), all
All digital inputs and outputs contain 75 k
When power is disconnected from the device, TLINE pins are low
impedance to ground if driven by more than one forward-bias diode
voltage (0.7 V) below ground. Additionally, driving TLINE, a
forward-bias diode voltage above the VGG pin, creates a low impedance
path from the TLINE pin to the VGG pin. Otherwise, the TLINE pins are
high impedance.
for the CX2833i-1x pin descriptions.
(CX28331-1x),
(CX28331-3x),
Conexant
1-2
1
1-5
(CX28332-1x), and
(CX28332-3x), and
Table 1-2
for the CX2833i-3x pin
pull-down resistors.
1-3
1-6
(CX28333-1x) illustrate
(CX28333-3x)
1-1