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| 型号： | ISL43640IR-T |
| 厂商： | Intersil |
| 文件页数： | 12/13页 |
| 文件大小： | 0K |
| 描述： | IC MUX/DEMUX 4X1 16QFN |
| 标准包装： | 6,000 |
| 功能： | 多路复用器/多路分解器 |
| 电路： | 1 x 4:1 |
| 导通状态电阻： | 50 欧姆 |
| 电压电源： | 单电源 |
| 电压 - 电源，单路/双路(±)： | 2 V ~ 12 V |
| 电流 - 电源： | 100pA |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-VFQFN 裸露焊盘 |
| 供应商设备封装： | 16-QFN-EP（3x3） |
| 包装： | 带卷 (TR) |
8
FN6043.3
January 23, 2006
Detailed Description
The ISL43640 operates from a single 2V to 12V supply with
low on-resistance (115
) and high speed operation
(tON = 60ns, tOFF = 30ns) with a +5V supply. The ISL43640
is especially well suited to portable battery powered
equipment thanks to the low operating supply voltage (2.0V),
low power consumption (3
W), low leakage currents (5nA
max), and the tiny MSOP and QFN packaging. High frequency
applications also benefit from the wide bandwidth, and the
very high off isolation (75dB).
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 GND (see
Figure 7). 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 7). 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.
This method is not applicable for the signal path inputs.
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 7). 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 ISL43640 construction is typical of most CMOS analog
switches, except that they have only two supply pins: V+ and
GND. V+ and GND drive the internal CMOS switches and
set their analog voltage limits. Unlike switches with a 13V
maximum supply voltage, the ISL43640’s 15V maximum
supply voltage provides plenty of room for the 10% tolerance
of 12V supplies, as well as room for overshoot and noise
spikes.
The minimum recommended supply voltage is 2.0V. 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 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.
The device cannot be operated with bipolar supplies,
because the input switching point becomes negative in this
configuration.
Logic-Level Thresholds
The ISL43640 is TTL compatible (0.8V and 2.4V) over a
supply range of 3V to 11V (see Figure 10). At 12V the VIH
level is 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 the 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 (see
Figure 11). Driving the digital input signals from GND to V+
with a fast transition time minimizes power dissipation.The
ISL43640 has been designed to minimize the supply current
whenever the digital input voltage is not driven to the supply
rails (0V to V+). For example driving the device with 3V logic
(0V to 3V) while operating with a 5V supply the device draws
only 10
A of current (see Figure 11 for VIN = 3V). Similiar
devices of competitors can draw 8 times this amount of
current.
High-Frequency Performance
In 50
systems, signal response is reasonably flat even past
frequency 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 feed
through from a switch’s input to its output. Off Isolation is the
resistance to this feed through. Figure 17 details the high Off
Isolation rejection provided by this family. At 10MHz, Off
Isolation is about 55dB in 50
systems, decreasing
approximately 20dB per decade as frequency increases.
Higher load impedances decrease Off Isolation due to the
FIGURE 7. OVERVOLTAGE PROTECTION
GND
VCOM
VNO or NC
OPTIONAL PROTECTION
V+
IN
DIODE
OPTIONAL PROTECTION
DIODE
OPTIONAL
PROTECTION
RESISTOR
FOR LOGIC
INPUTS
1k
ADDX
1k
ISL43640
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相关代理商/技术参数 |
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| ISL43640IRZ | 功能描述:IC MUX/DEMUX 4X1 16QFN 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 |
| ISL43640IRZ-T | 功能描述:IC MUX/DEMUX 4X1 16QFN 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:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:36 系列:- 功能:多路复用器 电路:2 x 4:1 导通状态电阻:75 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:- 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:20-SOIC（0.295"，7.50mm 宽） 供应商设备封装:20-SOIC W 包装:管件 |
| ISL43640IRZ-T7A | 功能描述:多路器开关 IC MUX 4:1 ENH 3V 65OHM 16QFN 3X3 IND RoHS:否 制造商:Texas Instruments 通道数量:1 开关数量:4 开启电阻（最大值）:7 Ohms 开启时间（最大值）: 关闭时间（最大值）: 传播延迟时间:0.25 ns 工作电源电压:2.3 V to 3.6 V 工作电源电流: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:UQFN-16 |
| ISL43640IU | 功能描述:IC MUX/DEMUX 4X1 10MSOP 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 |
| ISL43640IU-T | 功能描述:IC MUX/DEMUX 4X1 10MSOP 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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