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參數資料
| 型號： | L8574D |
| 英文描述： | CAP 15PF 50V 5% C0G SMD-0402 TR-7-PA SN100 |
| 中文描述： | L8574D電阻用戶線接口電路（SLIC），環繼電器和保護（SRP）的為遠距離和TR - 57應用 |
| 文件頁數： | 5/36頁 |
| 文件大小： | 489K |
| 代理商： | L8574D |
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Lucent Technologies Inc.
5
Data Sheet
October 1998
Relay, and Protector (SRP) for Long Loop and TR-57 Applications
L8574D Resistive Subscriber Line Interface Circuit (SLIC), Ring
Pin Information
(continued)
Table 1. Pin Descriptions
Pin
1
Symbol
IRCV
Type
I
Name/Function
The differential current flowing from PT to PR is
Receive Signal Input (+).
200 times the current flowing into IRCV.
+5 V Analog dc Supply.
Battery Noise Capacitor.
applied to CBN divided by the impedance connected between RGBN and AGND.
Connect a capacitor from CBN to V
BF
to eliminate battery noise from the Tip/Ring.
Battery Noise Gain Resistor.
The current flowing out of PR is 100 times the cur-
rent flowing into RGBN. Connect a resistor from RGBN to AGND to set the gain of
the battery noise cancellation circuit.
Analog Ground.
Ground return for analog circuitry.
Protected Ring A.
Connect to PRB via an external coupling network.
Protected Ring B.
Connect to PRA via an external coupling network.
Not Status.
When low, this logic output indicates either a ring trip or an off-hook
condition, depending on the input state of the SLIC.
Channel Select.
A low-to-high transition on this logic input stores the data on pins
B0—B3 into the input latches on the SLIC.
Bit 3.
B0—B3 determine the state of the SLIC. See the Operating States section.
Bit 2.
B0—B3 determine the state of the SLIC. See the Operating States section.
Bit 1.
B0—B3 determine the state of the SLIC. See the Operating States section.
Bit 0.
B0—B3 determine the state of the SLIC. See the Operating States section.
Channel Enable.
A low on this logic input resets latches B0—B3 to the 1111 state
and disables the channel select input CS. A high on this logic input enables the
channel select input CS.
+5 V Digital dc Supply.
+5 V supply for logic and switch circuitry.
Digital Ground.
Ground return for V
DD
and the relay driver.
Relay Driver.
This output drives an external relay.
Ring Trip Sense.
Sense input for the ring trip detector.
Ringing Access Switch.
Ringing relay connects this pin to pin V
ply). Connect this pin to pin V
BF
through a 600
Ringing Supply Voltage.
Connect this pin to the ringing supply.
Office Battery Supply.
Negative high-voltage power supply.
Feed Resistor Battery Supply.
Negative battery and ringing supply for the loop.
Connect this pin to the Ring of the loop through a 200
Fault Ground.
Protected Ring.
The input to the Ring fault protection and output of Ring current
drive amplifier (via the Ring access switch). Connect this pin to the Ring of the loop
through a 1 k
overvoltage protection resistor.
Protected Tip.
The input to the Tip fault protection and output of Tip current drive
amplifier. Connect this pin to the Tip of the loop through a 1 k
tion resistor. Connect to PTA via an external coupling network.
2
3
V
CBN
CCA
—
I
+5 V supply for analog circuitry.
The current flowing out of PR is –100 times the voltage
4
RGBN
I
5
7
8
9
AGND
PRA
PRB
NSTAT
—
—
—
O
11
CS
I
12
13
14
15
16
B3
B2
B1
B0
CE
I
I
I
I
I
17
18
19
20
21
V
DD
—
—
O
I
O
DGND
RDO
RTS
RSW
RNG
(ringing sup-
current-limiting resistor.
22
23
25
V
V
RNG
—
—
—
BAT1
V
BF
battery feed resistor.
27
30
FGND
PR
—
I/O
31
PT
I/O
overvoltage protec-
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