HC5503T
Pin Des criptions
24 PIN
SOIC
SYMBOL
DESCRIPTION
1
TIP
An analog input connected to the TIP (more positive) side of the subscriber loop through a 150Ω feed resistor. Functions
with the Ring terminal to receive voice signals from the telephone and for loop
monitoring purposes.
2
RING
An analog input connected to the RING (more negative) side of the subscriber loop through a 150Ω feed resistor.
Functions with the Tip terminal to receive voice signals from the telephone and for loop monitoring purposes.
3
4
5
V
Positive Voltage Source - Most positive supply. V
is typically 5V.
CC
CC
N/C
No Connect. For proper operation this pin should be left floating.
C
Capacitor - An external capacitor to be connected between this terminal and analog ground. Required for proper
1
operation of the voice band hybrid. Typical value is 0.3µF, 30V.
6
DGND
Digital Ground - To be connected to zero potential and serves as a reference for all digital inputs and outputs on the SLIC
microcircuit.
7
8
9
RS
N/C
TF
This pin should be tied to 5V.
No Connect. For proper operation this pin should be left floating.
Tip Feed - A low impedance analog output connected to the TIP terminal through a 150Ω feed resistor. Provides voice
signals to the telephone set and sink longitudinal current.
10
11
12
13
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
Negative Voltage Source - Most negative supply. V
Frequently referred to as “battery”.
has an operational range of -24V to -58V.
BAT
BAT
BGND
SHD
Battery Ground - To be connected to zero potential. All loop current and some quiescent current flows into this ground
terminal.
Switch Hook Detection - A low active LS TTL - compatible logic output. This output is enabled for loop currents exceeding
10mA and disabled for loop currents less than 5mA.
14
15
16
17
18
19
20
21
N/C
N/C
N/C
N/C
T1
No Connect. For proper operation this pin should be left floating.
No Connect. For proper operation this pin should be left floating.
No Connect. For proper operation this pin should be left floating.
No Connect. For proper operation this pin should be left floating.
Used during production testing. For proper operation this pin should be connected to pin T2.
Used during production testing. For proper operation this pin should be connected to pin T1.
Used during production testing. For proper operation this pin should be connected to Analog Ground pin AGND.
T2
T3
RX
Receive Input - 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 terminals, which in turn drive tip and ring
through 300Ω of feed resistance on each side of the line.
22
23
N/C
No Connect. For proper operation this pin should be left floating.
AGND
Analog Ground - To be connected to zero potential and serves as a reference for the transmit output (TX) and receive
input (RX) terminals.
24
TX
Transmit Output - A low impedance analog output which represents the differential voltage across Tip and Ring. 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.
NOTE: All grounds (AGND, BGND, and DGND) must be applied before V
or V
. Failure to do so may result in premature failure of the part. If
BAT
CC
a user wishes to run separate grounds off a line card, the AG must be applied first.
4
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