Line Card Access Switch
Features
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TTL logic level inputs for 3.3V logic interfaces
Smart logic for power up / hot plug state control
Improved switch dv/dt immunity of 500 V/μs
Small 16-pin SOIC or 16-pin DFN package
DFN package printed-circuit board footprint is 60
percent smaller than the SOIC version, 40 percent
smaller than fourth generation EMR solutions.
Monolithic IC reliability
Low, matched R
ON
Eliminates the need for zero-cross switching
Flexible switch timing for transition from ringing
mode to idle/talk mode.
Clean, bounce-free switching
Tertiary protection consisting of integrated current
limiting, voltage clamping, and thermal shutdown for
SLIC protection
5 V operation with power consumption < 10 mW
Intelligent battery monitor
Latched logic-level inputs, no external drive circuitry
VoIP Gateways
Central office (CO)
Digital Loop Carrier (DLC)
PBX Systems
Digitally Added Main Line (DAML)
Hybrid Fiber Coax (HFC)
Fiber in the Loop (FITL)
Pair Gain System
Channel Banks
CPC7591
Description
The CPC7591 is a member of Clare’s next generation
Line Card Access Switch (LCAS) family. This
monolithic 4-pole solid state switch is available in
either a 16-pin SOIC or a 16-pin DFN package. It
provides the necessary functions to replace the
2-Form-C electromechanical ringing relay and it’s
associated snubber circuitry on traditional analog line
cards or contemporary integrated voice and data (IVD)
line cards found in Central Office (CO), Access, and
PBX equipment. Because this device contains solid
state switches for tip and ring line break and for ringing
injection/return, it requires only a +5 V supply for
operation and TTL logic-level inputs for control. The
CPC7591 provides stable start-up conditioning during
system power up and for hot plug insertion
applications. Once active, the inputs respond to
traditional TTL logic levels, enabling the CPC7591 to
be used with 3.3V-only logic.
For negative transient voltage protection the
CPC7591xA versions include SCRs to provide voltage
fold-back protection for the SLIC and subsequent
circuitry, while the CPC7591xB versions utilize
clamping diodes to the V
BAT
pin. For positive transient
voltage protection all versions provide clamping
diodes to the F
GND
pin.
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Applications
Ordering Information
CPC7591 part numbers are specified as shown here:
B - 16-pin SOIC delivered 50/Tube, 1000/Reel
M - 16-pin DFN delivered 52/Tube, 1000/Reel
Pb
RoHS
2002/95/EC
e
3
6 T
RINGING
CPC7591 x x xx
TR - Add for Tape & Reel
Version
A -
With
Protection SCR
B -
Without
Protection SCR
Figure 1. CPC7591 Block Diagram
+5 Vdc
7 V
DD
Tip
Secondary
Protection
T
LINE
3
X
SW3
SW1
CPC7591
2 T
BAT
X
SLIC
R
LINE
14
SW2
15 R
BAT
L
A
T
C
H
8
T
SD
Ring
X
X
SW4
V
REF
Switch
Control
Logic
10
11
IN
RINGING
LATCH
12 R
RINGING
V
BAT
300
Ω
(min.)
RINGING
1
F
GND
SCR Trip Circuit
(CPC7591xA)
16
V
BAT
9
D
GND
DS-CPC7591 - R05
www.clare.com
1
CLARE [ CLARE, INC. ]
