HC-5504DLC Datasheet, PDF (4/9 Pages) Intersil Corporation – SLIC Subscriber Line Interface Circuit

Specifications HC-5504DLC
Uncommitted Op Amp Specifications
PARAMETER
Input Offset Voltage
Input Offset Current
Input Bias Current
Differential Input Resistance
Output Voltage Swing
Output Resistance
Small Signal GBW
CONDITIONS
(Note 2)
R_L = 10K, V_B+ = +12V
R_L = 10K, V_B+ = +5V
A_VCL = 1 (Note 2)
(Note 2)
MIN
TYP
-
±5
-
±10
-
20
-
1
-
±5
-
±3
-
10
-
1
MAX
-
-
-
-
-
-
-
-
UNITS
mV
nA
nA
MΩ
V_PEAK
V_PEAK
Ω
MHz
Pin Descriptions
28 PIN
PLCC
2
3
4
5
6
7
9
10
11
12
13
14
16
17
18
24 PIN
DIP/SOIC
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
SYMBOL
DESCRIPTION
TIP An analog input connected to the TIP (more positive) side of the subscriber loop through a 150Ω feed
resistor and a ring relay contact. Functions with the Ring terminal to receive voice signals from the
telephone and for loop monitoring purposes.
RING
An analog input connected to the RING (more negative) side of the subscriber loop through a 150Ω
feed resistor and a ring relay contact. Functions with the Tip terminal to receive voice signals from the
telephone and for loop monitoring purposes.
RFS
Senses ring side of loop for ground key and ring trip detection. During ringing, the ring signal is insert-
ed into the line at this node and RF is isolated from RFS via a relay.
V_B+ Positive Voltage Source - Most positive supply. V_B+ is typically 12V or 5V.
C3 Capacitor #3 - An external capacitor to be connected between this terminal and analog ground.
Required for proper operation of the loop current limiting function, and for filtering V_B-. Typical value
is 0.3µF, 30V.
DG Digital Ground - To be connected to zero potential and serves as a reference for all digital inputs and
outputs on the SLIC microcircuit.
RS Ring Synchronization Input - A TTL - compatible clock input. The clock should be arranged such that
a positive pulse transition occurs on the zero crossing of the ring voltage source, as it appears at the
RFS terminal. For Tip side injected systems, the RS pulse should occur on the negative going zero
crossing and for Ring injected systems, on the positive going zero crossing. This ensures that the ring
relay activates and deactivates when the instantaneous ring voltage is near zero. If synchronization
is not required, the pin should be tied to +5V.
RD Relay Driver - A low active open collector logic output. When enabled, the external ring relay is
energized.
TF Tip Feed - A low impedance analog output connected to the TIP terminal through a 150Ω feed resistor.
Functions with the RF terminal to provide loop current, feed voice signals to the telephone set, and
sink longitudinal current.
RF Ring Feed - A low impedance analog output connected to the RING terminal through a 150Ω feed
resistor. Functions with the TF terminal to provide loop current, feed voice signals to the telephone
set, and sink longitudinal current.
V_B- Negative Voltage Source - Most negative supply. V_B- is typically -48V with an operational range of
-42V to -58V. Frequently referred to as “battery”.
BG Battery Ground - To be connected to zero potential. All loop current and some quiescent current flows
into this ground terminal.
SHD Switch Hook Detection - A low active LS TTL - compatible logic output.
GKD
Ground Key Detection - A low active LS TTL - compatible logic output. This output is enabled if the
DC current into the ring lead exceeds the DC current out of the tip lead by more than 20mA, and dis-
abled if this current difference is below an internally set threshold.
PD Power Denial - A low active TTL - Compatible logic input. When enabled, the switch hook detect
(SHD) and ground key detect (GKD) are not necessarily valid, and the relay driver (RD) output is dis-
abled.
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