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參數(shù)資料
| 型號： | ISL84714IH-T |
| 廠商： | Intersil |
| 文件頁數(shù)： | 8/10頁 |
| 文件大小： | 0K |
| 描述： | IC SWITCH SPDT SC70-6 |
| 標準包裝： | 3,000 |
| 功能： | 開關(guān) |
| 電路： | 1 x SPDT |
| 導(dǎo)通狀態(tài)電阻： | 600 毫歐 |
| 電壓電源： | 單電源 |
| 電壓 - 電源，單路/雙路(±)： | 1.65 V ~ 3.6 V |
| 電流 - 電源： | 18nA |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 6-TSSOP，SC-88，SOT-363 |
| 供應(yīng)商設(shè)備封裝： | SC-70-6 |
| 包裝： | 帶卷 (TR) |
| 其它名稱： | ISL84714IH-TR |
7
FN6086.3
January 19, 2009
Logic inputs can easily be protected by adding a 1k
Ω
resistor in series with the input (see Figure 8). 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 acceptable 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 8). 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 signal range is
reduced and the resistance may increase, especially at low
supply voltages.
Power-Supply Considerations
The ISL84714 construction is typical of most single supply
CMOS analog switches, in that they have two supply pins:
V+ and GND. V+ and GND drive the internal CMOS
switches and set their analog voltage limits. Unlike switches
with a 4V maximum supply voltage, the ISL84714 4.8V
maximum supply voltage provides plenty of room for the
10% tolerance of 3.6V supplies, as well as room for
overshoot and noise spikes.
The minimum recommended supply voltage is 1.65V but the
part will operate with a supply below 1.5V. It is important to
note that the input signal range, switching times, and
ON-resistance degrade at lower supply voltages. Refer to
the “Electrical Specifications” Table beginning on page 3 and
“Typical Performance Curves” on page 8 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.
This family of switches cannot be operated with bipolar
supplies, because the input switching point becomes
negative in this configuration.
Logic-Level Thresholds
This switch family is 1.8V CMOS compatible (0.5V and 1.4V)
over a supply range of 2V to 3.6V (see Figure 15). At 3.6V
the VIH level is about 1.1V. This is still below the 1.8V CMOS
guaranteed high output minimum level of 1.4V, but noise
margin is reduced.
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 50
Ω systems, signal response is reasonably flat even past
90MHz (see Figure 16). The 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
feedthrough from a switch’s input to its output. OFF Isolation
is the resistance to this feedthrough, while crosstalk
indicates the amount of feedthrough from one switch to
another. Figure 17 details the high OFF Isolation and
crosstalk rejection provided by this family. At 1MHz, Off
Isolation is about 50dB in 50
Ω systems, decreasing
approximately 20dB per decade as frequency increases.
Higher load impedances decrease OFF Isolation and
crosstalk rejection due to the voltage divider action of the
switch OFF impedance and the load impedance.
Leakage Considerations
Reverse ESD protection diodes are internally connected
between each analog-signal pin and both V+ and GND. One of
these diodes conducts if any analog signal exceeds V+ or
GND.
Virtually all the analog leakage current comes from the ESD
diodes to V+ or GND. Although the ESD diodes on a given
signal pin are identical and therefore fairly well balanced,
they are reverse biased differently. Each is biased by either
V+ or GND and the analog signal. This means their leakages
will vary as the signal varies. The difference in the two diode
leakages to the V+ and GND pins constitutes the
analog-signal-path leakage current. All analog leakage
current flows between each pin and one of the supply
terminals, not to the other switch terminal. This is why both
sides of a given switch can show leakage currents of the
same or opposite polarity. There is no connection between
the analog signal paths and V+ or GND.
FIGURE 8. OVERVOLTAGE PROTECTION
GND
VCOM
VNO or NC
OPTIONAL PROTECTION
V+
INX
DIODE
OPTIONAL PROTECTION
DIODE
OPTIONAL
PROTECTION
RESISTOR
ISL84714
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ISL84714IHZ-T | 功能描述:IC SWITCH SPDT SC70-6 RoHS:是 類別:集成電路 (IC) >> 接口 - 模擬開關(guān)，多路復(fù)用器，多路分解器 系列:- 標準包裝:2,500 系列:- 功能:視頻交叉點開關(guān) 電路:1 x 8:6 導(dǎo)通狀態(tài)電阻:- 電壓電源:單電源 電壓 - 電源，單路/雙路(±):3.135 V ~ 5.25 V 電流 - 電源:55mA 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:24-TSSOP（0.173"，4.40mm 寬） 供應(yīng)商設(shè)備封裝:24-TSSOP 包裝:帶卷 (TR) 產(chǎn)品目錄頁面:1214 (CN2011-ZH PDF) 其它名稱:FMS6502MTC24XTR |
| ISL84714IHZ-T7A | 功能描述:模擬開關(guān) IC SUB 1OHM S SW 1 65V TO 3 6V SPDT OR 2:1 RoHS:否 制造商:Texas Instruments 開關(guān)數(shù)量:2 開關(guān)配置:SPDT 開啟電阻（最大值）:0.1 Ohms 切換電壓（最大）: 開啟時間（最大值）: 關(guān)閉時間（最大值）: 工作電源電壓:2.7 V to 4.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:DSBGA-16 |
| ISL84715 | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:Ultra Low ON-Resistance, Low Voltage, Single Supply, SPST Analog Switches |
| ISL84715_0411 | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:Ultra Low ON-Resistance, Low Voltage, Single Supply, SPST Analog Switches |
| ISL84715IH-T | 功能描述:模擬開關(guān) IC SPST NO RoHS:否 制造商:Texas Instruments 開關(guān)數(shù)量:2 開關(guān)配置:SPDT 開啟電阻（最大值）:0.1 Ohms 切換電壓（最大）: 開啟時間（最大值）: 關(guān)閉時間（最大值）: 工作電源電壓:2.7 V to 4.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:DSBGA-16 |
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