LUCL8574DP-D AGERE [Agere Systems], LUCL8574DP-D Datasheet - Page 5

• Manufacturer Part Number: LUCL8574DP-D
• Description: L8574D Resistive Subscriber Line Interface Circuit(SLIC), Ring Relay,and Protector(SRP)for Long Loop and TR-57 Applications
• Manufacturer: AGERE [Agere Systems]

Data Sheet
October 1998
Lucent Technologies Inc.
Pin Information
Table 1. Pin Descriptions
Pin
11
12
13
14
15
16
17
18
19
20
21
22
23
25
27
30
31
1
2
3
4
5
7
8
9
Symbol
NSTAT
RGBN
DGND
AGND
FGND
IRCV
RSW
V
RDO
V
V
CBN
PRA
PRB
RTS
V
V
CS
CE
PR
B3
B2
B1
B0
PT
BAT1
RNG
CCA
DD
BF
(continued)
Type
I/O
I/O
—
—
—
—
—
—
—
—
—
—
O
O
O
I
I
I
I
I
I
I
I
I
I
Relay, and Protector (SRP) for Long Loop and TR-57 Applications
Receive Signal Input (+). The differential current flowing from PT to PR is
200 times the current flowing into IRCV.
+5 V Analog dc Supply. +5 V supply for analog circuitry.
Battery Noise Capacitor. The current flowing out of PR is –100 times the voltage
applied to CBN divided by the impedance connected between RGBN and AGND.
Connect a capacitor from CBN to V
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
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
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 overvoltage protec-
tion resistor. Connect to PTA via an external coupling network.
L8574D Resistive Subscriber Line Interface Circuit (SLIC), Ring
BF
through a 600
Name/Function
BF
DD
to eliminate battery noise from the Tip/Ring.
and the relay driver.
current-limiting resistor.
battery feed resistor.
RNG
(ringing sup-
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