HC55180 Datasheet, PDF (19/19 Pages) Intersil Corporation – Extended Reach Ringing SLIC Family

HC55180, HC55181, HC55182, HC55183, HC55184
Pin Descriptions
PLCC
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
SYMBOL
TIP
BGND
VBL
VBH
SW+
SW-
SWC
F2
F1
F0
E0
DET
ALM
AGND
BSEL
NC
POL
VRS
VRX
VTX
VFB
-IN
VCC
CDC
RTD
ILIM
RD
RING
DESCRIPTION
TIP power amplifier output.
Battery Ground - To be connected to zero potential. All loop current and longitudinal current flow from this ground. Inter-
nally separate from AGND but it is recommended that it is connected to the same potential as AGND.
Low battery supply connection.
High battery supply connection for the most negative battery.
Uncommitted switch positive terminal. This pin is a no connect (NC) on the HC55180, HC55183 and HC55184.
Uncommitted switch negative terminal. This pin is a no connect (NC) on the HC55180, HC55183 and HC55184.
Switch control input. This TTL compatible input controls the uncommitted switch, with a logic “0” enabling the switch and
logic “1” disabling the switch. This pin is a no connect (NC) on the HC55180, HC55183 and HC55184.
Mode control input - MSB. F2-F0 for the TTL compatible parallel control interface for controlling the various modes of
operation of the device.
Mode control input.
Mode control input.
Detector Output Selection Input. This TTL input controls the multiplexing of the SHD (E0 = 1) and GKD (E0 = 0)
comparator outputs to the DET output based upon the state at the F2-F0 pins (see the Device Operating Modes table
shown on page 2).
Detector Output - This TTL output provides on-hook/off-hook status of the loop based upon the selected operating mode.
The detected output will either be switch hook, ground key or ring trip (see the Device Operating Modes table shown on
page 2).
Thermal Shutdown Alarm. This pin signals the internal die temperature has exceeded safe operating temperature
(approximately 175^oC) and the device has been powered down automatically.
Analog ground reference. This pin should be externally connected to BGND.
Selects between high and low battery, with a logic “1” selecting the high battery and logic “0” the low battery. This pin is
a no connect (NC) on the HC55180.
This pin is a no connect (NC) for all the devices.
External capacitor on this pin sets the polarity reversal time. This pin is a no connect on the HC55182 and HC55183.
Ringing Signal Input - Analog input for driving 2-wire interface while in Ring Mode.
Analog Receive Voltage - 4-wire analog audio input voltage. AC couples to CODEC.
Transmit output voltage - Output of impedance matching amplifier, AC couples to CODEC.
Feedback voltage for impedance matching. This voltage is scaled to accomplish impedance matching.
Impedance matching amplifier summing node.
Positive voltage power supply, usually +5V.
DC Biasing Filter Capacitor - Connects between this pin and V_CC.
Ring trip filter network.
Loop Current Limit programming resistor.
Switch hook detection threshold programming resistor.
RING power amplifier output.
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Intersil semiconductor products are sold by description only. Intersil Corporation reserves the right to make changes in circuit design and/or specifications at any time with-
out notice. Accordingly, the reader is cautioned to verify that data sheets are current before placing orders. Information furnished by Intersil is believed to be accurate and
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