HC-5504B1_03 Datasheet, PDF (7/10 Pages) Intersil Corporation – ITU Low Cost, PABX SLIC With 40mA Loop Feed

HC-5504B1
Schematic
SLIC FUNCTIONAL SCHEMATIC
DIP/SOIC Pin Numbers Shown
TF
9
TIP
1
RING
FEED
SENSE
3
RING
2
RF
10
21
22
11
12
23
6
4
RX
C₄
V_BAT
BAT
GND
ANA
GND
DIG
GND
V_B+
20
19
+
-
18
OUT
V_B+
V_B+
V_B+
+
A-400
TIP FEED
AMP
V_BAT
I_B4
-
V_B1
V_B2
VOLTAGE AND CURRENT
V_B3
BIAS NETWORK
V_B4
V_B5
R₁₇
5V
V_B2 ^IB1 ^IB2 ^IB3 ^IB4 ^IB5 ^IB6 ^IB7 ^IB8 ^VBAT ^IB9 ^IB10 ^IB11
RING TRIP DETECTOR
R₁₂
5V
A-500
OP AMP
V_BAT
I_B3
5V ^{IB10 V}B⁺
R₇
-
V_B+
R₈
V_B+ ^{QD3 QD36}
A-200
LONG’L
R₂₀
R₁₀
R₉
I / V AMP
+
R₁₁
I_B7
V_BAT
V_BAT
R₂₂
R₂₃ ^{VB+ VBAT}
R₅
+
V_B+
R₃
A-100
TRANSV’L
R₄
I/V AMP
R₁
-
V_BAT
I_B6
R₂
R₆
R₁₆
V_BAT/2 REFERENCE
R₁₅
V_B2
R₁₄
R₁₈
-
R₂₁
A-300
RING FEED
AMP
+
V_BAT
R₁₉
I_B5
GK
+
V_BAT
V_B4
I_B8
SWITCH HOOK
DETECTOR
V_B+
+
I_B6
Q_D27
-
V_B1
Q_D28
GND SHORTS
CURRENT
LIMITING
I_B1
-
+
V_B3
V_BAT
STTL
AND LOGIC
INTERFACE
SH
LOAD CURRENT
LIMITING _IB2
-^VB5
+
THERMAL
LIMITING
V_B5
RFC
V_BAT
GKD
14
C₂
17
SHD
13
RC
16
PD
15
R₁₃
V_BAT
V_BAT
C₃
TX
5
24
RS
RD
7
8
7