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參數(shù)資料
| 型號： | CN8333EXF |
| 英文描述： | PCM Transceiver |
| 中文描述： | 收發(fā)器的PCM |
| 文件頁數(shù)： | 17/48頁 |
| 文件大?。?/td> | 434K |
| 代理商： | CN8333EXF |
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CN8331/CN8332/CN8333
1.0 Pin Description
Single/Dual/Triple E3/DS3/STS-1 Line Interface Unit
1.1 Pin Assignments
100604B
Conexant
1-9
16
8
8
RVSS
RVSS1
RX ground Ch1
P
Ground pins for receive circuitry per
channel.
Connect to ground.
—
24
16
RVSS2
RX ground Ch2
P
—
—
24
RVSS3
RX ground Ch3
P
60
60
60
DVDDC
Digital core power
P
Digital core power for all channels (3.3V).
41
41
41
DVSSC
Digital core ground
P
Digital core ground for all channels.
79
79
79
VGG
5 V/3.3 V ESD pin
(1)
P
5 V supply for 5 V-tolerant, digital pad ESD
diodes. No static power is drawn from pin.
73
73
73
DVDDIO
Digital I/O power
P
Connect to 3.3 V digital power.
28
28
28
DVSSIO
Digital ground
P
Digital ground.
4, 5, 20,
21
12, 13
—
VDD
Power
P
Connect to 3.3 V power.
1, 8, 17,
24
9, 16
—
VSS
Ground
P
Connect to ground.
Miscellaneous
58
76
76
PD/
PD1
Power down for Ch1
I
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. (See PD pin).
—
25
58
PD2
Power down for Ch2
I
—
—
25
PD3
Power down for Ch3
I
47
65
65
REFCLK/
REFCLK1
Reference clock for Ch1
I
Reference clock from off-chip.
This clock should be set to one of the
following:
E3 rate (34.368 MHz)
DS3 rate (44.736 MHz)
STS-1 rate (51.84 MHz)
The clock rate should correspond to the
mode of operation that has been chosen for
the channel.
—
36
47
REFCLK2
Reference clock for Ch2
I
—
—
36
REFCLK3
Reference clock for Ch3
I
80
80
80
RBIAS
Bias resistor
O
A 12.1 k
±1% resistor tied from this pin to
ground provides the current reference to
the entire chip.
(2)
78
78
78
Reset
Reset
I/O
Asynchronous reset (reset entire device).
77
77
77
GPD
Global Power Down
I/O
Power Down (device enter low power state
for Static Idd testing).
Table 1-1. CN8331/CN8332/CN8333 Pin Definitions
(5 of 6)
Pin #
Signal Name
Description
I/O/P
Notes
CN8331
CN8332
CN8333
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