HC5503CB Intersil, HC5503CB Datasheet - Page 12

• Manufacturer Part Number: HC5503CB
• Description: IC,SLIC,2-4 CONVERSION,BIPOLAR,SOP,24PIN,PLASTIC
• Manufacturer: Intersil

Specifications of HC5503CB

• Rohs Compliant: NO

Pin Descriptions
NOTE: All grounds (AG, BG, and DG) must be applied before V
wishes to run separate grounds off a line card, the AG must be applied first.
17, 18, 19,
24 PIN
SOIC
10
11
12
13
15
16
21
22
23
24
14
20
1
2
3
4
5
6
7
8
9
SYMBOL
RING
V
RFS
V
SHD
TIP
DG
RS
RD
BG
PD
RC
AG
NC
NC
C
TF
RF
R
C
TX
BAT
CC
1
X
2
An analog input connected to the TIP (more positive) side of the subscriber loop. Functions with the Ring terminal to
receive voice signals from the telephone and for loop monitoring purposes.
An analog input connected to the RING (more negative) side of the subscriber loop. Functions with the Tip terminal to
receive voice signals from the telephone and for loop monitoring purposes.
Senses ring side of loop for ring trip detection. During ringing, the ring signal is inserted into the line at this node and
RF is isolated from RFS via a relay.
Positive Voltage Source - Most positive supply. V
Capacitor #1 - 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
Digital Ground - To be connected to zero potential and serves as a reference for all digital inputs and outputs on the
SLIC microcircuit.
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.
Relay Driver - A low active open collector logic output. When enabled, the external ring relay is energized.
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.
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.
Negative Voltage Source - Most negative supply. V
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 10.5mA and disabled for loop currents less than 5mA.
Power Denial - A low active TTL - Compatible logic input. When enabled, the switch hook detect (SHD) is not
necessarily valid, and the relay driver (RD) output is disabled.
Ring Command - A low active TTL - Compatible logic input. When enabled, the relay driver (RD) output goes low on
the next high level of the ring sync (R
subscriber is not already off-hook (SHD = 0).
Receive Input, Four Wire Side - A high impedance analog input which is internally biased. Capacitive coupling to this input
is required. AC signals appearing at this input deferentially drive the Tip feed and Ring feed terminals, which in turn drive tip
and ring through 150Ω of feed resistance on each side of the line.
Capacitor #2 - An external capacitor to be connected between this terminal and analog ground. This capacitor prevents
false ring trip detection from occurring when longitudinal currents are induced onto the subscriber loop from nearby
power lines and other noise sources. Recommended value is 1.0µF, 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, Four Wire Side - A low impedance analog output which represents the differential voltage across Tip and
Ring. Transhybrid balancing must be performed 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.
Used during production testing. For proper operation of the SLIC, this pin should float.
No internal connection.
12
CC
S
HC5503
) input, as long as the SLIC is not in the power denial state (PD = 0) or the
or V
BAT
. Failure to do so may result in premature failure of the part. If a user
BAT
CC
BAT
DESCRIPTION
is typically 5V.
is typically -24V. Frequently referred to as “battery”.
. Typical value is 0.3µF, 16V.