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HC-5504B1 Datasheet(PDF) 6 Page - Intersil Corporation

Part No. HC-5504B1
Description  ITU Low Cost, PABX SLIC With 40mA Loop Feed
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Maker  INTERSIL [Intersil Corporation]
Homepage  http://www.intersil.com/cda/home
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 6 page
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57
Functional Diagram
26
C4
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 longitudinal currents are induced onto the
subscriber loop from near by power lines and other noise sources. This capacitor is also required for the proper operation
of ring trip detection. Typical value is 0.5
µF, to 1.0µF, 20V. This capacitor should be nonpolarized.
27
AG
Analog Ground - To be connected to zero potential and serves as a reference for the transmit output (TX) and receive
input (RX) terminals.
28
TX
Transmit Output, Four Wire Side - A low impedance analog output which represents the differential voltage 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.
1, 8,
15, 22
NC
No internal connection.
NOTE: All grounds (AG, BG, and DG) must be applied before VB+orVB-. Failure to do so may result in premature failure of the part. If a user wishes
to run separate grounds off a line card, the AG must be applied first.
Pin Descriptions (Continued)
28 PIN
PLCC
SYMBOL
DESCRIPTION
+
DIFF
AMP
+
OP
AMP
LOOP
MONITORING
RING
CONTROL
2-WIRE
LOOP
SECONDARY
PROTECTION
LINE
DRIVERS
TIP
RING
VB-
VB-
PD
POWER DENIAL
150
RING
150
RF
BG
150
TF
TIP
RD
RC
RS
RING SYNC
RING COMMAND
RING
TRIP
SHD
GKD
TX
TRANSMIT
OUTPUT
OUT
+IN
-IN
RX
RECEIVE
INPUT
SLIC MICROCIRCUIT
1/2 RING
RELAY
VB-
RING
VOLTAGE
RFS
1/2 RING
RELAY
150
SWITCH HOOK
DETECTION
GROUND KEY
DETECTION
-1
+1
BATTERY
FEED
LOOP
CURRENT
LIMITER
HC-5504B1




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