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| 型號(hào)： | CPC7514ZTR |
| 廠商： | IXYS Integrated Circuits Division |
| 文件頁數(shù)： | 2/15頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC ANALOG SW ARRAY QUAD 20-SOIC |
| 標(biāo)準(zhǔn)包裝： | 1,000 |
| 功能： | 高壓開關(guān) |
| 電路： | 4 x 1:1 |
| 導(dǎo)通狀態(tài)電阻： | 14.5 歐姆 |
| 電壓電源： | 雙電源 |
| 電壓 - 電源，單路/雙路(±)： | ±3 V |
| 工作溫度： | -40°C ~ 110°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 20-SOIC（0.295"，7.50mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 20-SOIC |
| 包裝： | 帶卷 (TR) |
INTEGRATED CIRCUITS DIVISION
CPC7514
10
www.ixysic.com
R06
3. Functional Description
3.1 Introduction
The CPC7514 High Voltage Quad Analog Switch
Array has four independent symmetrical switches
providing 16 unique operating states. These
operational states and the logical behavior of the
device are shown in the tables given in “Truth
Tables” on page 8. Switch organization consists of
two channels each having a pair of switches. Within
each channel there is a single LATCH input and a
single Temperature Shutdown circuit shared by the
switch pair. Other than these two shared circuits the
performance of each switch within a channel is
independent of the other. As there is no shared
circuitry between the channels, the switches of one
channel are completely independent of the other
channel. Switch utilization under normal operating
conditions allows the switches to be used in any
combination. In designs where the switches will be
required to carry high load currents or operate in
higher temperature environments the thermal
specifications should be reviewed.
Solid-state switch construction of the CPC7514 offers
clean, bounce-free switching with simple logic input
control to provide access to high voltage interfaces
without the impulse noise generated by traditional
electromechanical switching techniques. Simple logic
input control eliminates the additional driver circuitry
required by traditional techniques.
The low on-resistance (RON) symmetrical linear
switches are configured as matched pairs, SW1/SW2
and SW3/SW4, for improved performance when
differential access is required. Their symmetrical
construction provides an additional degree of design
flexibility allowing either side of the switch to be
connected to the high voltage network.
Integrated into the CPC7514 switches are active
current limiting and thermal shutdown mechanisms to
provide protection for the electronics being connected
to the high voltage network during a fault condition.
High frequency positive and negative transient
currents such as lightning are reduced by the current
limiting circuitry. Protection from prolonged low
frequency power-cross and DC currents, also reduced
by the current limiting circuitry, is supplemented by
thermal shutdown circuits.
To protect against a high voltage fault in excess of the
CPC7514’s maximum voltage rating, use of an
over-voltage protector is required. The protector must
limit the voltage seen at the SxA and SxB terminals to a
level below the switches maximum breakdown
voltage. To minimize the stress on the solid-state
contacts, use of a foldback or crowbar type protector is
highly recommended. With proper selection of the
protector, telecom applications using the CPC7514
will meet all relevant ITU, LSSGR, TIA/EIA and IEC
protection requirements.
Operating from a single +3.3V supply the CPC7514
has extremely low power consumption.
3.2 Under-Voltage Switch Lock-Out Circuitry
Smart logic in the CPC7514 provides for switch state
control during both power up and power loss
transitions to prevent undesired connections to high
voltage networks. An internal detector evaluates the
VDD supply to determine when to de-assert the
under-voltage switch lock-out circuitry with a rising
VDD, and when to assert the under-voltage switch
lock-out circuitry with a falling VDD. Any time
unsatisfactory low VDD conditions exist, the lock-out
circuit overrides user switch control by blocking the
external information at the input pins, and conditioning
internal switch commands to the All-Off state. Upon
restoration of VDD, the switches will remain off until the
LATCHx input is pulled low with proper conditioning of
the INx inputs.
The rising VDD lock-out release threshold is internally
set to ensure all internal logic is properly biased and
functional before accepting external switch commands
from the inputs to control the switch states. For a
falling VDD event, the lock-out threshold is set to
assure proper logic and switch behavior up to the
moment the switches are forced off and external
inputs are suppressed.
3.3 Switch Logic
The CPC7514 uses smart logic to monitor the VDD
supply. Any time VDD is below an internally set
threshold, the smart logic places the control logic into
the All-Off state. After VDD recovers the switches may
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