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| 型號(hào)： | CPC7584BA |
| 廠商： | CLARE INC |
| 元件分類： | 通信及網(wǎng)絡(luò) |
| 中文描述： | SPECIALTY TELECOM CIRCUIT, PDSO16 |
| 封裝： | SOIC-16 |
| 文件頁數(shù)： | 2/16頁 |
| 文件大小： | 320K |
| 代理商： | CPC7584BA |
CPC7584
10
www.clare.com
Rev. B
Preliminar
y
2. Functional Description
2.1 Introduction
The CPC7584xA/B has four states:
Talk. Line break switches SW1 and SW2 closed,
ringing switches SW3 and SW4 open, and test
switches SW5 and SW6 open.
Ringing. Line break switches SW1 and SW2 open,
ringing switches SW3 and SW4 closed, and test-in
switches SW5 and SW6 open.
Test. Line break switches SW1 and SW2 open,
ringing switches SW3 and SW4 open, and test-in
switches SW5 and SW6 closed.
All off. Line break switches SW1 and SW2 open,
ringing switches SW3 and SW4 open, and loop test
switches SW5 and SW6 open.
The CPC7584xC replaces the Test state with the
Test/Monitor state as defined below.
Test/Monitor. Line break switches SW1 and SW2
closed, ringing switches SW3 and SW4 open, and
test-in switches SW5 and SW6 closed.
The CPC7584 offers break-before-make and
make-before-break switching with simple logic-level
input control. Solid-state switch construction means no
impulse noise is generated when switching during ring
cadence or ring trip, eliminating the need for external
zero-cross switching circuitry. State-control is via
logic-level input so no additional driver circuitry is
required. The line break switches SW1 and SW2 are
linear switches that have exceptionally low RDSON
and excellent matching characteristics. The ringing
access switch SW4 has a breakdown voltage rating of
greater than 480 V. This is sufficiently high, with proper
protection, to prevent breakdown in the presence of a
transient fault condition (i.e., passing the transient on
to the ring generator).
Integrated into the CPC7584 is a diode bridge/SCR
clamping circuit, current limiting, and a thermal
shutdown mechanism to provide protection to the
SLIC device during a fault condition. Positive and
negative surges are reduced by the current limiting
circuitry and steered to ground via diodes and the
integrated SCR. Power-cross transients are also
reduced by the current limiting and thermal shutdown
circuits. Note that only the CPC7584xA and
CPC7584xC parts include the integrated protection
SCR.
To protect the CPC7584 from an overvoltage fault
condition, use of a secondary protector is required.
The secondary protector must limit the voltage seen at
the tip and ring terminals to a level below the
maximum breakdown voltage of the switches. To
minimize the stress on the solid-state contacts, use of
a foldback or crowbar type secondary protector is
recommended. With proper selection of the secondary
protector, a line card using the CPC7582BC will meet
all relevant ITU, LSSGR, FCC and UL protection
requirements.
The CPC7584 operates from a +5 V supply only. This
gives the device extremely low idle and active power
dissipation and allows use with virtually any range of
battery voltage. A battery voltage is also used by the
CPC7584 as a reference for the integrated protection
circuit. In the event of a loss of battery voltage, the
CPC7584 enters the all-off state.
2.2 Switch Timing
The CPC7584 provides, when switching from the
ringing state to the idle/talk state, the ability to control
the release timing of the ringing access switches SW3
and SW4 relative to the state of the line break
switches SW1 and SW2 using simple logic-level input.
This is referred to a make-before-break or
break-before-make operation. When the line break
switch contacts (SW1 and SW2) are closed (or made)
before the ringing access switch contacts (SW3 and
SW4) are opened (or broken), this is referred to
make-before-break operation. Break-before-make
operation occurs when the ringing access contacts
(SW3 and SW4) are opened (broken) before the line
break switch contacts (SW1 and SW2) are closed
(made). With the CPC7584, the make-before-break
and break-before-make operations can easily be
selected by applying logic-level inputs to pins 9 and 10
(INRING and INTEST-IN) of the device.
The logic sequences for either mode of operation are
Logic states and explanations are given in “Truth Table
Break-before-make operation can also be achieved
using pin 7 (TSD) as an input. In “Break-Before-Make
lines 2 and 3, it is possible to induce the switches to
the all-off state by grounding pin 7 (TSD) instead of
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| CPC7584BB | 功能描述:SWITCH LINE CARD ACCESS 16-SOIC RoHS:是 類別:集成電路 (IC) >> 接口 - 電信 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS 產(chǎn)品變化通告:Product Discontinuation 06/Feb/2012 標(biāo)準(zhǔn)包裝:750 系列:* |
| CPC7584BBTR | 功能描述:SWITCH LINE CARD ACCESS 16-SOIC RoHS:是 類別:集成電路 (IC) >> 接口 - 電信 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS 產(chǎn)品變化通告:Product Discontinuation 06/Feb/2012 標(biāo)準(zhǔn)包裝:750 系列:* |
| CPC7584BC | 功能描述:SWITCH LINE CARD ACCESS 16-SOIC RoHS:是 類別:集成電路 (IC) >> 接口 - 電信 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS 產(chǎn)品變化通告:Product Discontinuation 06/Feb/2012 標(biāo)準(zhǔn)包裝:750 系列:* |
| CPC7584BCTR | 功能描述:SWITCH LINE CARD ACCESS 16-SOIC RoHS:是 類別:集成電路 (IC) >> 接口 - 電信 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS 產(chǎn)品變化通告:Product Discontinuation 06/Feb/2012 標(biāo)準(zhǔn)包裝:750 系列:* |
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