HC-5502B Intersil Corporation, HC-5502B Datasheet - Page 6

• Manufacturer Part Number: HC-5502B
• Description: Eia/itu Pabx Slic With 30ma Loop Feed
• Manufacturer: Intersil Corporation

Pin Descriptions
NOTE:
Functional Diagram
5. All grounds (AG, BG, and DG) must be applied before V
1, 8, 5, 22
28 PIN
to run separate grounds off a line card, the AG must be applied first.
PLCC
24
25
26
27
28
2 WIRE
LOOP
RING
TIP
V
DIP/SOIC
VOLTAGE
B
24 PIN
-
RING
20
21
22
23
24
RELAY
RING
PROTECTION
SECONDARY
RING COMMAND
POWER DENIAL
(Continued)
150
52
RING SYNC
SYMBOL
(Note 5)
150
+IN
RX
AG
NC
C
TX
4
150
150
RING
V
The non-inverting analog input of the spare operational amplifier.
Receive Input, 4-Wire Side - A high impedance analog input which is internally biased. Capacitive
coupling to this input is required. AC signals appearing at this input differentially drive the Tip feed
and Ring feed amplifiers, which in turn drive tip and ring through 300
side of the line.
Capacitor #4 - An external capacitor to be connected between this terminal and analog ground. This
capacitor prevents false ground key indication and false ring trip detection from occurring when lon-
gitudinal currents are induced onto the subscriber loop from nearby power lines and other noise
sources. This capacitor is also required for the proper operation of ring trip detection. Typical value
is 0.5 F to 1.0 F, 20V. This capacitor should be nonpolarized.
Analog Ground - To be connected to zero potential and serves as a reference for the transmit output
(TX) and receive input (RX) terminals.
Transmit Output, 4-Wire Side - A low impedance analog output which represents the differential volt-
age across Tip and Ring. Transhybrid balancing must be performed (using the SLIC microcircuit’s
spare op amp) beyond this output to completely implement two to four wire conversion. This output
is unbalanced and referenced to analog ground. Since the DC level of this output varies with loop
current, capacitive coupling to the next stage is essential.
No internal connection.
TIP
PD
B
RF
BG
RS
RC
RD
TF
-
B
+ or V
CURRENT
BATTERY
CONTROL
LIMITER
FEED
LOOP
HC-5502B
RING
B
-. Failure to do so may result in premature failure of the part. If a user wishes
SLIC MICROCIRCUIT
RING
TRIP
DRIVERS
LINE
+1
-1
MONITORING
DESCRIPTION
LOOP
AMP
OP
+
-
+
-
DIFF
AMP
SHD
GKD
OUT
+IN
-IN
TX
RX RECEIVE
of feed resistance on each
SWITCH HOOK
DETECTION
GROUND KEY
DETECTION
TRANSMIT
OUTPUT
INPUT