HC55183ECM Intersil, HC55183ECM Datasheet - Page 16

• Manufacturer Part Number: HC55183ECM
• Manufacturer: Intersil

Specifications of HC55183ECM

• Number Of Channels: 1
• On-hook Transmission: Yes
• Polarity Reversal: Yes
• On-chip Ring Relay Driver: Yes
• Longitudinal Balanced: 45
• Operating Supply Voltage (typ): 5/-28V
• Operating Temp Range: 0C to 70C
• Package Type: PLCC
• Loop Current Limit: 45mA
• Operating Temperature Classification: Commercial
• Pin Count: 28
• Mounting: Surface Mount
• Operating Current: 8.5mA
• Operating Supply Voltage (max): 5.25/-75V
• Operating Supply Voltage (min): 4.75/-24V
• Lead Free Status / RoHS Status: Not Compliant

As with all decoupling schemes, the capacitors should be as
close to the device pins as physically possible.
Uncommitted Switch
Overview
The uncommitted switch is a three terminal device designed
for flexibility. The independent logic control input, SWC,
allows switch operation regardless of device operating
mode. The switch is activated by a logic low. The positive
and negative terminals of the device are labeled SW+ and
SW- respectively.
Relay Driver
The uncommitted switch may be used as a relay driver by
connecting SW+ to the relay coil and SW- to ground. The
switch is designed to have a maximum on voltage of 0.6V
with a load current of 45mA.
Since the device provides the ringing waveform, the relay
functions which may be supported include subscriber
disconnect, test access or line interface bypass. An external
snubber diode is not required when using the uncommitted
switch as a relay driver.
Test Load
The switch may be used to connect test loads across Tip
and Ring. The test loads can provide external test
termination for the device. Proper connection of the
uncommitted switch to Tip and Ring is shown below.
FIGURE 11. ALTERNATE DECOUPLING SCHEME
FIGURE 12. EXTERNAL RELAY SWITCHING
+5V
0.22µ
RELAY
SW+
SW-
VBL
HC5518X
16
0.22µ
VBH
HC55180, HC55181, HC55183, HC55184
SWC
The diode in series with the test load blocks current from
flowing through the uncommitted switch when the polarity of
the Tip and Ring terminals are reversed. In addition to the
reverse active state, the polarity of Tip and Ring are
reversed for half of the ringing cycle. With independent logic
control and the blocking diode, the uncommitted switch may
be continuously connected to the Tip and Ring terminals.
RING
TIP
FIGURE 13. TEST LOAD SWITCHING
LOAD
TEST
SW+
SW-
SWC