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参数资料
| 型号： | ISL84514IBZ-T |
| 厂商： | Intersil |
| 文件页数： | 9/11页 |
| 文件大小： | 0K |
| 描述： | IC SWITCH SPST 8SOIC |
| 标准包装： | 2,500 |
| 功能： | 开关 |
| 电路： | 1 x SPST- NO |
| 导通状态电阻： | 20 欧姆 |
| 电压电源： | 单电源 |
| 电压 - 电源，单路/双路(±)： | 2.4 V ~ 12 V |
| 电流 - 电源： | 1µA |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SOIC |
| 包装： | 带卷 (TR) |
7
Detailed Description
The ISL84514 and ISL84515 analog switches offer precise
switching capability from a single 2.4V to 12V supply with
low on-resistance, and high-speed operation. The devices
are especially well suited to portable battery powered
equipment thanks to the low operating supply voltage (2.4V),
low power consumption (5
W), low leakage currents (2nA
max), and the tiny SOT-23 packaging. High frequency
applications also benefit from the wide bandwidth, and the
very high Off Isolation.
Supply Sequencing And Overvoltage Protection
With any CMOS device, proper power supply sequencing is
required to protect the device from excessive input currents
which might permanently damage the IC. All I/O pins contain
ESD protection diodes from the pin to V+ and to GND (see
Figure 6). To prevent forward biasing these diodes, V+ must
be applied before any input signals, and input signal voltages
must remain between V+ and GND. If these conditions
cannot be guaranteed, then one of the following two
protection methods should be employed.
Logic inputs can easily be protected by adding a 1k
resistor in series with the input (see Figure 6). The resistor
limits the input current below the threshold that produces
permanent damage, and the sub-microamp input current
produces an insignificant voltage drop during normal
operation.
Adding a series resistor to the switch input defeats the
purpose of using a low RON switch, so two small signal
diodes can be added in series with the supply pins to provide
overvoltage protection for all pins (see Figure 6). These
additional diodes limit the analog signal from 1V below V+ to
1V above GND. The low leakage current performance is
unaffected by this approach, but the switch resistance may
increase, especially at low supply voltages.
Power-Supply Considerations
The ISL8451X construction is typical of most CMOS analog
switches, except that there are only two supply pins: V+ and
GND. Unlike switches with a 13V maximum supply voltage,
the ISL8451X 15V maximum supply voltage provides plenty
of room for the 10% tolerance of 12V supplies, as well as
margin for overshoot and noise spikes.
The minimum recommended supply voltage is 2.4V. It is
important to note that the input signal range, switching times,
and on-resistance degrade at lower supply voltages. Refer to
the electrical specification tables and Typical Performance
Curves for details.
V+ and GND power the internal CMOS switches and set
their analog voltage limits. These supplies also power the
internal logic and level shifters. The level shifters convert the
input logic levels to switched V+ and GND signals to drive
the analog switch gate terminals.
This family of switches cannot be operated with bipolar
supplies, because the input switching point becomes
negative in this configuration. For a
±5V single SPST switch,
see the ISL84516, ISL84517 data sheet.
Logic-Level Thresholds
This switch family is TTL compatible (0.8V and 2.4V) over a
supply range of 3V to 11V, and the full temperature range
about 2.5V. This is still below the TTL guaranteed high
output minimum level of 2.8V, but noise margin is reduced.
For best results with a 12V supply, use a logic family that
provides a VOH greater than 3V.
The digital input stages draw supply current whenever the
digital input voltage is not at one of the supply rails. Driving
the digital input signals from GND to V+ with a fast transition
time minimizes power dissipation.
High-Frequency Performance
In 5
0 systems, signal response is reasonably flat to
20MHz, with a -3dB bandwidth exceeding 200MHz (see
response is very consistent over a wide V+ range, and for
varying analog signal levels.
An OFF switch acts like a capacitor and passes higher
frequencies with less attenuation, resulting in signal
feedthrough from a switch’s input to its output. Off Isolation is
the resistance to this feedthrough. Figure 14 details the high
Off Isolation provided by this family. At 10MHz, off isolation is
about 50dB in 5
0 systems, decreasing approximately 20dB
per decade as frequency increases. Higher load impedances
decrease Off Isolation due to the voltage divider action of the
switch OFF impedance and the load impedance.
FIGURE 6. OVERVOLTAGE PROTECTION
GND
VCOM
VNO OR NC
OPTIONAL PROTECTION
V+
IN
DIODE
OPTIONAL PROTECTION
DIODE
OPTIONAL
PROTECTION
RESISTOR
ISL84514, ISL84515
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ISL84514IH-T | 功能描述:模拟开关 IC SPST NO Low Voltage RoHS:否 制造商:Texas Instruments 开关数量:2 开关配置:SPDT 开启电阻（最大值）:0.1 Ohms 切换电压（最大）: 开启时间（最大值）: 关闭时间（最大值）: 工作电源电压:2.7 V to 4.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:DSBGA-16 |
| ISL84514IHZ-T | 功能描述:IC SWITCH SPST SOT23-5 RoHS:是 类别:集成电路 (IC) >> 接口 - 模拟开关，多路复用器，多路分解器 系列:- 标准包装:1 系列:- 功能:开关 电路:2 x SPST - NC/NO 导通状态电阻:8 欧姆 电压电源:单电源 电压 - 电源，单路/双路(±):2.3 V ~ 4.3 V 电流 - 电源:1µA 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:8-UFQFN 供应商设备封装:8-迷你型QFN（1.4x1.4） 包装:剪切带 (CT) 其它名称:DG2738DN-T1-E4CT |
| ISL84515 | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:Low-Voltage, Single Supply, SPST, Analog Switches |
| ISL84515IB | 功能描述:IC SWITCH SPST 8SOIC RoHS:否 类别:集成电路 (IC) >> 接口 - 模拟开关，多路复用器，多路分解器 系列:- 标准包装:48 系列:- 功能:开关 电路:4 x SPST - NO 导通状态电阻:100 欧姆 电压电源:单/双电源 电压 - 电源，单路/双路(±):2 V ~ 12 V，±2 V ~ 6 V 电流 - 电源:50nA 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:16-SOIC（0.154"，3.90mm 宽） 供应商设备封装:16-SOIC 包装:管件 |
| ISL84515IB-T | 功能描述:IC SWITCH SPST 8SOIC RoHS:否 类别:集成电路 (IC) >> 接口 - 模拟开关，多路复用器，多路分解器 系列:- 标准包装:48 系列:- 功能:开关 电路:4 x SPST - NO 导通状态电阻:100 欧姆 电压电源:单/双电源 电压 - 电源，单路/双路(±):2 V ~ 12 V，±2 V ~ 6 V 电流 - 电源:50nA 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:16-SOIC（0.154"，3.90mm 宽） 供应商设备封装:16-SOIC 包装:管件 |
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