Data Sheet
March 1997
L7554 Low-Power SLIC
Applications
V
BAT
C
BAT
0.1 µF
R
PROG
3
15
66.8 kΩ
I
PROG
V
BAT
VREG
14
12
DCOUT
29
11
R
LCTH
V
TX
LCTH
CB2
0.1 µF
R
X
24.9 kΩ
28.0 kΩ
8
TXI
GSX
V
CC
VCC
R
T2
0.1 µF
18.7 kΩ
VFXIN
VFXIP
20
C
CC
VITR
–
+
R
T1
R
HB1
DX
86.6 kΩ
28.0 kΩ
PCM
HIGHWAY
R
PT
TIP
R
RCV
30
PT
48.7 kΩ
PWROP
9
20 Ω
250 V PROT
RCVP
RCVN
DR
L7554
SLIC
R
GP
L7581
RELAY
FSX
FSR
MC
10
SYNCH
AND
CLOCK
PWRON
GSR
20.0 kΩ
C
GP
330 pF
B2 35
B1 36
B0 23
CONTROL
INPUTS
PD
CLKSEL
A/µ
RING
R
PR
16
32
PR
CONTROL
INPUTS
20 Ω
RTSP
2.0 MΩ
RTSP
NLC 34
T7513
CODEC
SUPERVISION
OUTPUTS
R
402 Ω
TS1
C
RTS2
NRDET 33
C
RTS1
0.27 µF
0.022 µF
31
RTSN
CF2
18
CF1 AGND AGND BGND
19 24 25 27
R
TSN
R
TS2
2.0 MΩ
274 kΩ
C
F1
VRING
0.47 µF
C
0.1 µF
F2
VBAT
12-2573 (C)
Figure 11. Basic Loop Start Application Circuit Using T7513 Type Codec
VCC
RGDET
100 kΩ
LOOP START
APPLICATION CIRCUIT
22
21
RGDET
ICM
82.5 kΩ
RICM2
0.47 µF
CICM
12-2821 (C)
Figure 12. Ground Start Application Circuit
14
Lucent Technologies Inc.
AGERE [ AGERE SYSTEMS ]
