ATTL7554BP Agere Systems, ATTL7554BP Datasheet - Page 15

• Manufacturer Part Number: ATTL7554BP
• Description: L7554 Low-Power SLIC
• Manufacturer: Agere Systems

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