ATTL7554AP Просмотр технического описания (PDF) - Agere -> LSI Corporation
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ATTL7554AP Datasheet PDF : 28 Pages
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Data Sheet
March 1997
L7554 Low-Power SLIC
Applications (continued)
Table 10. Parts List for Loop Start and Ground Start Applications
Name
Value
Integrated Circuits
SLIC
L7554
Protector
250 V Thyristor type
Ringing Relay
L7581
Codec
T7513
Overvoltage Protection
RPT
20 Ω, Fusible
RPR
20 Ω, Fusible
Power Supply
CBAT1
0.1 µF, 20%, 100 V
CCC
0.1 µF, 20%, 10 V
CF1
0.47 µF, 20%, 100 V
CF2
0.1 µF, 20%, 100 V
dc Profile
RPROG
66.8 kΩ, 1%, 1/4 W
ac Characteristics
CB2
0.1 µF, 20%, 100 V
CGB
330 µF, 20%, 10 V
RT1
86.6 kΩ, 1%, 1/4 W
RRCV
48.7 kΩ, 1%, 1/4 W
RGP
20.0 kΩ, 1%, 1/4 W
CGP
RT2
RX
RHB1
Supervision
RLCTH
RTS1
RTS2
330 pF, 10 V, 20%
18.7 kΩ, 1%, 1/4 W
28.0 kΩ, 1%, 1/4 W
28.0 kΩ, 1%, 1/4 W
24.9 kΩ, 1%, 1/4 W
402 Ω, 5%, 2 W
274 kΩ, 5%, 1/4 W
CRTS1
CRTS2
RTSN
RTSP
Ground Start
CICM
RGDET
RICM2
0.022 µF, 20%, 5 V
0.27 µF, 20%, 100 V
2 MΩ, 5%, 1/4 W
2 MΩ, 5%, 1/4 W
0.47 µF, 20%, 10 V
100 kΩ, 20%, 1/4 W
82.5 kΩ, 1%, 1/4 W
Function
Subscriber loop interface circuit (SLIC).
Secondary protection.
Switches ringing signals.
First-generation codec.
Protection resistor.
Protection resistor.
VBAT filter capacitor.
VCC filter.
With CF2, improves idle channel noise.
With CF1, improves idle channel noise.
Sets dc loop current limit.
ac/dc separation capacitor.
Loop stability.
With RGP and RRCV, sets ac termination impedance.
With RGP and RT1, sets receive gain.
With RT1 and RRCV, sets ac termination impedance
and receive gain.
Loop stability.
With RX, sets transmit gain in codec.
With RT2, sets transmit gain in codec.
Sets hybrid balance.
Sets loop closure (off-hook) threshold.
Ringing source series resistor.
With CRTS2, forms first pole of a double pole,
2 Hz ring trip sense filter.
With RTSN, RTSP, forms second 2 Hz filter pole.
With RTS2, forms first 2 Hz filter pole.
With CRTS1, RTSP, forms second 2 Hz filter pole.
With CRTS1, RTSN, forms second 2 Hz filter pole.
Provides 60 Hz filtering for ring ground detection.
Digital output pull-up resistor.
Sets ring ground detection threshold.
Lucent Technologies Inc.
15
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