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| 型号： | CPC7581BATR |
| 厂商： | CLARE INC |
| 元件分类： | 通信及网络 |
| 中文描述： | SPECIALTY TELECOM CIRCUIT, PDSO16 |
| 封装： | ROHS COMPLIANT, SOIC-16 |
| 文件页数： | 2/17页 |
| 文件大小： | 526K |
| 代理商： | CPC7581BATR |
CPC7581
10
www.clare.com
R05
2. Functional Description
2.1 Introduction
The CPC7581 has three states:
Talk. Line break switches SW1 and SW2 closed,
ringing switches SW3 and SW4 open.
Ringing. Ringing switches SW3 and SW4 closed,
line break switches SW1 and SW2 open.
All-off. All switches open.
See “Truth Table” on page 9 for more information.
The CPC7581 offers break-before-make and
make-before-break switching from the ringing state to
the talk state 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 RON and
excellent matching characteristics. The ringing switch
SW4 has a breakdown voltage rating of 465V @ 25°C.
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 ringing
generator).
Integrated into the CPC7581 is a over voltage
clamping circuit, active 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 hazardous potentials are steered to
ground via diodes and, in CPC7581xA and
CPC7581xC parts, an integrated SCR. Power-cross
potentials are also reduced by the current limiting and
thermal shutdown circuits.
To protect the CPC7581 from an overvoltage fault
condition, the 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 CPC7581 will meet all
relevant ITU, LSSGR, TIA/EIA and IEC protection
requirements.
The CPC7581 operates from a +5 V supply only. This
gives the device extremely low idle and active power
consumption and allows use with virtually any range of
battery voltage. Battery voltage is also used by the
CPC7581 as a reference for the integrated protection
circuit. In the event of a loss of battery voltage, the
CPC7581 enters the all-off state.
2.2 Switch Logic
The CPC7581 provides, when switching from the
ringing state to the talk state, the ability to control the
release timing of the ringing switches SW3 and SW4
relative to the state of the line break switches SW1
and SW2 using simple logic-level input. This is called
make-before-break or break-before-make operation.
When the line break switch contacts (SW1 and SW2)
are closed (or made) before the ringing switch
contacts (SW3 and SW4) are opened (or broken), this
is called make-before-break operation.
Break-before-make operation occurs when the ringing
contacts (SW3 and SW4) are opened (broken) before
the line break contacts (SW1 and SW2) are closed
(made).
To use make-before-break ringing switch release
timing, de-assert INRINGING during ringing. This
causes the operational sequence shown in “Make-
Transition)” on page 11 to occur.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| CPC7581BA-TR | 制造商:CLARE 制造商全称:Clare, Inc. 功能描述:Line Card Access Switch |
| CPC7581BB | 功能描述:固态继电器-PCB安装 4-pole, no SCR, SOIC LCAS RoHS:否 制造商:Omron Electronics 控制电压范围: 负载电压额定值:40 V 负载电流额定值:120 mA 触点形式:1 Form A (SPST-NO) 输出设备:MOSFET 封装 / 箱体:USOP-4 安装风格:SMD/SMT |
| CPC7581BBTR | 功能描述:固态继电器-PCB安装 4-pole, no SCR, SOIC LCAS, T/R RoHS:否 制造商:Omron Electronics 控制电压范围: 负载电压额定值:40 V 负载电流额定值:120 mA 触点形式:1 Form A (SPST-NO) 输出设备:MOSFET 封装 / 箱体:USOP-4 安装风格:SMD/SMT |
| CPC7581BB-TR | 制造商:CLARE 制造商全称:Clare, Inc. 功能描述:Line Card Access Switch |
| CPC7581BC | 功能描述:固态继电器-PCB安装 16-pin SOIC RoHS:否 制造商:Omron Electronics 控制电压范围: 负载电压额定值:40 V 负载电流额定值:120 mA 触点形式:1 Form A (SPST-NO) 输出设备:MOSFET 封装 / 箱体:USOP-4 安装风格:SMD/SMT |
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