参数资料
| 型号： | ISL84782IV-T |
| 厂商： | Intersil |
| 文件页数： | 10/12页 |
| 文件大小： | 0K |
| 描述： | IC MUX/DEMUX DUAL 4X1 16TSSOP |
| 标准包装： | 2,500 |
| 功能： | 多路复用器/多路分解器 |
| 电路： | 2 x 4:1 |
| 导通状态电阻： | 750 毫欧 |
| 电压电源： | 单电源 |
| 电压 - 电源，单路/双路(±)： | 1.6 V ~ 3.6 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-TSSOP（0.173"，4.40mm 宽） |
| 供应商设备封装： | 16-TSSOP |
| 包装： | 带卷 (TR) |
7
FN6097.3
November 17, 2004
Detailed Description
The ISL84782 analog multiplexer offers precise switching
capability from a single 1.6V to 3.6V supply with low on-
resistance (0.5
) and high speed operation (tON = 16ns,
tOFF = 13ns). The device is especially well suited for
portable battery powered equipment thanks to the low
operating supply voltage (1.6V), low power consumption
(0.2
W), low leakage currents (60nA max). High frequency
applications also benefit from the wide bandwidth, and the
very high off isolation and crosstalk rejection.
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 8). To prevent forward biasing these diodes, V+ must
be applied before any input signals, and the 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 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 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 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 ISL84782 construction is typical of most CMOS analog
switches, in that it has two supply pins: V+ and GND. V+ and
GND drive the internal CMOS switches and set its analog
voltage limits. Unlike switches with a 4V maximum supply
voltage, the ISL84782 4.7V 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 1.6V 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-
FIGURE 6. CROSSTALK TEST CIRCUIT
FIGURE 7. CAPACITANCE TEST CIRCUIT
Test Circuits and Waveforms (Continued)
0V or V+
ANALYZER
Ax
SIGNAL
GENERATOR
RL
GND
ADD1
50
N.C.
COMB
Bx
V+
C
COMA
Crosstalk is measured between adjacent channels with one channel
ON and the other channel OFF.
Signal direction through switch is reversed and worst case values
are recorded.
ADD0
CHANNEL
SELECT
INH
GND
Ax or Bx
COMA or COMB
ADD1
IMPEDANCE
ANALYZER
0V or V+
V+
C
ADD0
CHANNEL
SELECT
INH
FIGURE 8. OVERVOLTAGE PROTECTION
GND
VCOM
VNOx
OPTIONAL PROTECTION
V+
INH
DIODE
OPTIONAL PROTECTION
DIODE
OPTIONAL
PROTECTION
RESISTOR
FOR LOGIC
INPUTS
1k
ADDX
1k
ISL84782
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ISL84782IVZ | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:Ultra Low ON-Resistance, Low-Voltage, Single Supply, Differential 4 to 1 Analog Multiplexer |
| ISL84782IVZ-T | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:Ultra Low ON-Resistance, Low-Voltage, Single Supply, Differential 4 to 1 Analog Multiplexer |
| ISL8478IRZ | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:Ultra Low ON-Resistance, Low-Voltage, Single Supply, 8 to 1 Analog Multiplexer |
| ISL8478IRZ-T | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:Ultra Low ON-Resistance, Low-Voltage, Single Supply, 8 to 1 Analog Multiplexer |
| ISL8483 | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:5V, Low Power, High Speed or Slew Rate Limited, RS-485/RS-422 Transceivers |
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