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参数资料
| 型号： | ADG3247BRU-REEL7 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 2/12页 |
| 文件大小： | 0K |
| 描述： | IC SW BUS 2.5/3.3V 16BIT 38TSSOP |
| 标准包装： | 1,000 |
| 类型： | 总线开关 |
| 电路： | 8 x 1:1 |
| 独立电路： | 2 |
| 电压电源： | 单电源 |
| 电源电压： | 2.5V, 3.3V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 38-TFSOP（0.173"，4.40mm 宽） |
| 供应商设备封装： | 38-TSSOP |
| 包装： | 带卷 (TR) |
REV. 0
–10–
ADG3247
VIN
1.8V
VOUT
0V
3.3V
SWITCH
INPUT
S
WITCH
OU
TPUT
3.3V SUPPLY
SEL = 0V
Figure 10. 3.3 V to 1.8 V Voltage Translation,
SEL = 0 V
Bus Isolation
A common requirement of bus architectures is low capacitance
loading of the bus. Such systems require bus bridge devices that
extend the number of loads on the bus without exceeding the
specifications. Because the ADG3247 is designed specifically for
applications that do not need drive yet require simple logic func-
tions, it solves this requirement. The device isolates access to the
bus, thus minimizing capacitance loading.
BUS/
BACKPLANE
LOAD A
LOAD C
LOAD B
LOAD D
BUS SWITCH
LOCATION
Figure 11. Location of Bus Switched in a Bus
Isolation Application
Hot Plug and Hot Swap Isolation
The ADG3247 is suitable for hot swap and hot plug applications.
The output signal of the ADG3247 is limited to a voltage that is
below the VCC supply, as shown in Figures 6, 8, and 10. There-
fore the switch acts like a buffer to take the impact from hot
insertion, protecting vital and expensive chipsets from damage.
In hot-plug applications, the system cannot be shutdown when
new hardware is being added. To overcome this, a bus switch can
be positioned on the backplane between the bus devices and the
hot plug connectors. The bus switch is turned off during hot plug.
Figure 12 shows a typical example of this type of application.
PLUG-IN
CARD (1)
CARD I/O
RAM
CPU
PLUG-IN
CARD (2)
ADG3247
Figure 12. ADG3247 in a Hot Plug Application
There are many systems that require the ability to handle hot
swapping, such as docking stations, PCI boards for servers, and
line cards for telecommunications switches. If the bus can be
isolated prior to insertion or removal, then there is more control
over the hot swap event. This isolation can be achieved using a
bus switch. The bus switches are positioned on the hot swap card
between the connector and the devices. During hot swap, the
ground pin of the hot swap card must connect to the ground pin
of the back plane before any other signal or power pins.
Analog Switching
Bus switches can be used in many analog switching applications;
for example, video graphics. Bus switches can have lower on
resistance, smaller ON and OFF channel capacitance and thus
improved frequency performance than their analog counterparts.
The bus switch channel itself consisting solely of an NMOS
switch limits the operating voltage (see TPC 1 for a typical plot),
but in many cases
, this does not present an issue.
High Impedance during Power-Up/Power-Down
To ensure the high impedance state during power-up or power-
down, BEx should be tied to VCC through a pull-up resistor;
the minimum value of the resistor is determined by the current-
sinking capability of the driver.
PACKAGE AND PINOUT
The ADG3247 is packaged in both a small 38-lead TSSOP or
a tiny 40-lead LFCSP package. The area of the TSSOP option
is 62.7 mm
2, while the area of the LFCSP option is 36 mm2.
This leads to a 43% savings in board space when using the LFCSP
package compared with the TSSOP package. This makes the
LFCSP option an excellent choice for space-constrained
applications.
The ADG3247 in the TSSOP package offers a flowthrough
pinout. The term flowthrough signifies that all the inputs are on
opposite sides from the outputs. A flowthrough pinout simplifies
the PCB layout.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ADG3247BRUZ | 功能描述:IC SW BUS 2.5/3.3V 16BIT 38TSSOP RoHS:是 类别:集成电路 (IC) >> 逻辑 - 信号开关，多路复用器，解码器 系列:- 标准包装:1 系列:74LVC 类型:解码器/多路分解器 电路:1 x 2:4 独立电路:2 输出电流高，低:24mA，24mA 电压电源:单电源 电源电压:1.65 V ~ 3.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:16-SOIC（0.209"，5.30mm 宽） 供应商设备封装:16-SO 包装:Digi-Reel® 其它名称:296-28947-6 |
| ADG3247BRUZ-REEL | 制造商:Analog Devices 功能描述:- Tape and Reel |
| ADG3248 | 制造商:AD 制造商全称:Analog Devices 功能描述:2.5 V/ 3.3 V, 2 :1 Multiplexer/ Demultiplexer Bus Switch |
| ADG3248BKS-R2 | 功能描述:IC MUX/DEMUX 2X1 SC70-6 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 |
| ADG3248BKS-REEL | 制造商:Analog Devices 功能描述:Multiplexer/Demultiplexer Bus Switch 1-Element CMOS 2-IN 6-Pin SC-70 T/R |
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