hc5523 Intersil Corporation, hc5523 Datasheet - Page 18

• Manufacturer Part Number: hc5523
• Description: Lssgr/tr57 Co/loop Carrier Slic With Low Power Standby
• Manufacturer: Intersil Corporation

Pin Descriptions
17, 24
PLCC
3, 10,
11
12
13
14
15
16
18
19
20
21
22
23
25
26
27
28
1
2
4
5
6
7
8
9
PDIP
10
11
12
13
14
15
16
17
18
19
20
21
22
7
8
9
1
2
3
4
5
6
RING
TIP
RINGRLY
SYMBOL
RINGX
BGND
AGND
V
TIPX
RSN
HPR
V
R
DET
R
HPT
V
V
N/C
RD
DR
SENSE
C2
C1
DT
E1
E0
BAT
E
CC
SG
DC
EE
TX
SENS
18
Internally connected to output of RING power amplifier.
Battery Ground - To be connected to zero potential. All loop current and longitudinal current flow from this ground.
Internally separate from AGND but it is recommended that it is connected to the same potential as AGND.
+5V power supply.
Ring relay driver output.
Battery supply voltage, -24V to -56V.
Saturation guard programming resistor pin.
TTL compatible logic input. The logic state of E1 in conjunction with the logic state of C1 determines which detector
is gated to the DET output.
TTL compatible logic input. Enables the DET output when set to logic level zero and disables DET output when
set to a logic level one.
Detector output. TTL compatible logic output. A zero logic level indicates that the selected detector was triggered
(see Truth Table for selection of Ground Key detector, Loop Current detector or the Ring Trip detector). The DET
output is an open collector with an internal pull-up of approximately 15kΩ to V CC.
TTL compatible logic input. The logic states of C1 and C2 determine the operating states (Open Circuit, Active,
Ringing or Standby) of the SLIC.
TTL compatible logic input. The logic states of C1 and C2 determine the operating states (Open Circuit, Active,
Ringing or Standby) of the SLIC.
DC feed current programming resistor pin. Constant current feed is programmed by resistors R
connected in series from this pin to the receive summing node (RSN). The resistor junction point is decoupled to
AGND to isolate the AC signal components.
Analog ground.
Receive Summing Node. The AC and DC current flowing into this pin establishes the metallic loop current that
flows between tip and ring. The magnitude of the metallic loop current is 1000 times greater than the current into
the RSN pin. The constant current programming resistors and the networks for program receive gain and 2-wire
impedance all connect to this pin.
-5V power supply.
Transmit audio output. This output is equivalent to the TIP to RING metallic voltage. The network for programming
the 2-wire input impedance connects between this pin and RSN.
RING side of AC/DC separation capacitor C
DC loop current. The other end of C
TIP side of AC/DC separation capacitor C
loop current. The other end of C
Loop current programming resistor. Resistor R
capacitor C
Input to ring trip comparator. Ring trip detection is accomplished by connecting an external network to a
comparator in the SLIC with inputs DT and DR.
Input to ring trip comparator. Ring trip detection is accomplished by connecting an external network to a
comparator in the SLIC with inputs DT and DR.
Internally connected to output of tip power amplifier.
Output of tip power amplifier.
Output of ring power amplifier.
No internal connection.
D
is also connected between this pin and V
HP
HC5523
is connected to HPR.
HP
is connected to HPT.
HP
HP
. C
. C
D
HP
DESCRIPTION
sets the trigger level for the loop current detect circuit. A filter
HP
is required to properly separate the tip AC current from the DC
is required to properly separate the ring AC current from the
EE
.
DC1
and R
DC2