ATTL7554BP Agere Systems, ATTL7554BP Datasheet - Page 15
![no-image](/images/manufacturer_photos/0/0/21/agere_systems_sml.jpg)
ATTL7554BP
Manufacturer Part Number
ATTL7554BP
Description
L7554 Low-Power SLIC
Manufacturer
Agere Systems
Datasheet
1.ATTL7554BP.pdf
(28 pages)
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Data Sheet
March 1997
Lucent Technologies Inc.
Applications
Table 10. Parts List for Loop Start and Ground Start Applications
Integrated Circuits
SLIC
Protector
Ringing Relay
Codec
Overvoltage Protection
R
R
Power Supply
C
C
C
C
dc Profile
R
ac Characteristics
C
C
R
R
R
C
R
R
R
Supervision
R
R
R
C
C
R
R
Ground Start
C
R
R
PT
PR
BAT1
CC
F1
F2
PROG
B2
GB
T1
RCV
GP
GP
T2
X
HB1
LCTH
TS1
TS2
RTS1
RTS2
TSN
TSP
ICM
GDET
ICM2
Name
(continued)
L7554
250 V Thyristor type
L7581
T7513
20 , Fusible
20 , Fusible
0.1 F, 20%, 100 V
0.1 F, 20%, 10 V
0.47 F, 20%, 100 V
0.1 F, 20%, 100 V
66.8 k , 1%, 1/4 W
0.1 F, 20%, 100 V
330 F, 20%, 10 V
86.6 k , 1%, 1/4 W
48.7 k , 1%, 1/4 W
20.0 k , 1%, 1/4 W
330 pF, 10 V, 20%
18.7 k , 1%, 1/4 W
28.0 k , 1%, 1/4 W
28.0 k , 1%, 1/4 W
24.9 k , 1%, 1/4 W
402 , 5%, 2 W
274 k , 5%, 1/4 W
0.022 F, 20%, 5 V
0.27 F, 20%, 100 V
2 M , 5%, 1/4 W
2 M , 5%, 1/4 W
0.47 F, 20%, 10 V
100 k , 20%, 1/4 W
82.5 k , 1%, 1/4 W
Value
Subscriber loop interface circuit (SLIC).
Secondary protection.
Switches ringing signals.
First-generation codec.
Protection resistor.
Protection resistor.
V
V
With C
With C
Sets dc loop current limit.
ac/dc separation capacitor.
Loop stability.
With R
With R
With R
and receive gain.
Loop stability.
With R
With R
Sets hybrid balance.
Sets loop closure (off-hook) threshold.
Ringing source series resistor.
With C
2 Hz ring trip sense filter.
With R
With R
With C
With C
Provides 60 Hz filtering for ring ground detection.
Digital output pull-up resistor.
Sets ring ground detection threshold.
BAT
CC
filter.
filter capacitor.
T1
T2
TSN
TS2
F2
F1
GP
GP
X
RTS2
RTS1
RTS1
, sets transmit gain in codec.
, improves idle channel noise.
, improves idle channel noise.
, sets transmit gain in codec.
and R
and R
and R
, forms first 2 Hz filter pole.
, R
, forms first pole of a double pole,
, R
, R
TSP
TSP
TSN
RCV
, forms second 2 Hz filter pole.
RCV
T1
, forms second 2 Hz filter pole.
, forms second 2 Hz filter pole.
, sets receive gain.
, sets ac termination impedance
, sets ac termination impedance.
Function
L7554 Low-Power SLIC
15