Line Card Access Switch
CPC7508
Features
•
•
•
•
•
•
TTL logic level inputs for 3.3V logic interfaces
Smart logic for power up / hot plug state control
Monolithic IC reliability
Low matched R
ON
Clean, bounce-free switching
Tertiary protection consisting of integrated current
limiting and thermal shutdown for SLIC protection
•
+12.5V operation with power consumption
≤25mW
•
Latched logic level inputs, no external drive circuitry
required
•
Small 16-pin SOIC
Description
The CPC7508 is a member of Clare’s next generation
Line Card Access Switch family. When used with
ringing SLICs it provides the necessary functions to
replace the two 2-Form-C electromechanical test
relays used in contemporary Fiber To The Home
(FTTH) and Optical Network Unit (ONU) deployments
as well as Voice over IP (VoIP) telephony terminals.
Solid state switches provide the mechanism for tip and
ring line break, drop test, and channel test while
requiring only a single +12V supply for operation.
Interface compatibility with 3.3V or 5V logic for switch
state control is provided by the TTL logic level inputs.
The CPC7508 is designed for fiber access units where
EMR’s are used for test access and line monitoring
functions but solid-state switches are desired due to
reduced operating noise, lower power consumption
and longer lifetimes.
This monolithic 8-pole solid-state switch is available in
a 16-pin SOIC package.
Applications
•
•
•
•
•
•
Fiber to the Home (FTTH)
Fiber in the Loop (FITL)
VoIP Gateways
PBX Systems
Digitally Added Main Line (DAML)
Hybrid Fiber Coax (HFC)
Ordering Information
Part Number Description
CPC7508B
CPC7508BTR
8-pole LCAS, 16-pin SOIC in tubes (50/tube)
8-pole LCAS, 16-pin SOIC in reels (1000/reel)
Figure 1. CPC7508 Block Diagram
T
TEST_IN
(T
CHAN_TEST
)
T
TEST_OUT
(T
DROP_TEST
)
7
8
CPC7508
+12V
DC
1
V
DD
SW7
X
SW3
Tip
T
LINE
6
Secondary
Protection
X
X
SW5
5
T
BAT
Ringing
SLIC
SW1
Ring
R
LINE
11
SW2
12
R
BAT
X
X
X
SW4
SW8
X
SW6
Switch
Control
Logic
X
L
A
T
C
H
3
16
15
14
13
IN
A
IN
B
IN
C
LATCH
T
SD
R
TEST_OUT
(R
DROP_TEST
)
R
TEST_IN
(R
CHAN_TEST
)
10
9
2
GND
Pb
DS-CPC7508 - R04
RoHS
2002/95/EC
e
3
1
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CLARE [ CLARE, INC. ]
