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參數資料
| 型號： | ADG3245 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | 2.5 V/3.3 V, 8-Bit, 2-Port Level Translating, Bus Switch |
| 中文描述： | 2.5 V/3.3五，8位，2端口級翻譯，總線開關 |
| 文件頁數： | 9/12頁 |
| 文件大?。?/td> | 333K |
| 代理商： | ADG3245 |
PRELIMINARY TECHNICAL DATA
REV. Pr
E
ADG3245
–9–
BUS SWITCH APPLICATIONS
Mixed Voltage Operation, Level Translation
Bus switches can be used to provide an ideal solution for inter-
facing between mixed voltage systems. The ADG3245 is suitable
for applications where voltage translation from 3.3 V technology
to a lower voltage technology is needed. This device can translate
from 3.3 V to 1.8 V, from 2.5 V to 1.8 V, or bidirectionally
from 3.3 V directly to 2.5 V.
Figure 4 shows a block diagram of a typical application in which
a user needs to interface between a 3.3 V ADC and a 2.5 V
microprocessor. The microprocessor may not have 3.3 V toler-
ant inputs, therefore placing the ADG3245 between the two
devices allows the devices to communicate easily. The bus
switch directly connects the two blocks, thus introducing
minimal propagation delay, timing skew, or noise.
3.3V ADC
2.5V
3.3V
2.5V
MICROPROCESSOR
A
3.3V
Figure 4. Level Translation between a 3.3 V ADC
and a 2.5 V Microprocessor
3.3 V to 2.5 V Translation
When V
CC
is 3.3 V (
SEL
= 3.3 V) and the input signal range is
0 V to V
CC
, the max output signal will be clamped to within a
voltage threshold below the V
CC
supply.
ADG3245
2.5V
2.5V
3.3V
2.5V
3.3V
Figure 5. 3.3 V to 2.5 V Voltage Translation,
SEL
= 3.3 V
In this case, the output will be limited to 2.5 V, as shown in
Figure 6.
V
IN
2.5V
V
OUT
0V
3.3V
SWITCH
INPUT
S
O
3.3V SUPPLY
SEL
= 3.3V
Figure 6. 3.3 V to 2.5 V Voltage Translation,
SEL
= 3.3 V
This device can be used for translation from 2.5 V to 3.3 V
devices, and also between two 3.3 V devices.
2.5 V to 1.8 V Translation
When V
CC
is 2.5 V (
SEL
= 2.5 V) and the input signal range is
0 V to V
CC
, the max output signal will, as before, be clamped to
within a voltage threshold below the V
CC
supply.
ADG3245
1.8V
2.5V
2.5V
Figure 7. 2.5 V to 1.8 V Voltage Translation,
SEL
= 2.5 V
In this case, the output will be limited to approximately
1.8 V, as shown in Figure 7.
V
IN
1.8V
V
OUT
0V
2.5V
SWITCH
INPUT
S
O
2.5V SUPPLY
SEL
= 2.5V
Figure 8. 2.5 V to 1.8 V Voltage Translation,
SEL
= 2.5 V
3.3 V to 1.8 V Translation
The ADG3245 offers the option of interfacing between a 3.3 V
device and a 1.8 V device. This is possible through use of the
SEL
pin.
SEL
pin: An active low control pin.
SEL
activates internal
circuitry in the ADG3245 that allows voltage translation
between 3.3 V devices and 1.8 V devices.
ADG3245
1.8V
3.3V
3.3V
Figure 9. 3.3 V to 1.8 V Voltage Translation,
SEL
= 0 V
When V
CC
is 3.3 V and the input signal range is 0 V to V
CC
, the
max output signal will be clamped to 1.8 V, as shown in Figure 9.
To do this, the
SEL
pin must be tied to Logic 0. If
SEL
is
unused, it should be tied directly to V
CC
.
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相關代理商/技術參數 |
參數描述 |
|---|---|
| ADG3245BCP | 制造商:Rochester Electronics LLC 功能描述: 制造商:Analog Devices 功能描述: |
| ADG3245BCP-REEL7 | 制造商:Rochester Electronics LLC 功能描述:2.2V/3.3V,8 BIT,2 PORT BUS SW/TRANS - Tape and Reel |
| ADG3245BCPZ | 功能描述:IC SW BUS 2.5-3.3V 8BIT 20LFCSP RoHS:是 類別:集成電路 (IC) >> 邏輯 - 信號開關，多路復用器，解碼器 系列:- 標準包裝:48 系列:74VHC 類型:多路復用器 電路:4 x 2:1 獨立電路:1 輸出電流高，低:8mA，8mA 電壓電源:單電源 電源電壓:2 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:16-SOIC（0.154"，3.90mm 寬） 供應商設備封裝:16-SOIC 包裝:管件 |
| ADG3245BRU | 功能描述:IC SW BUS 2.5/3.3V 8BIT 20TSSOP RoHS:否 類別:集成電路 (IC) >> 邏輯 - 信號開關，多路復用器，解碼器 系列:- 標準包裝:48 系列:74VHC 類型:多路復用器 電路:4 x 2:1 獨立電路:1 輸出電流高，低:8mA，8mA 電壓電源:單電源 電源電壓:2 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:16-SOIC（0.154"，3.90mm 寬） 供應商設備封裝:16-SOIC 包裝:管件 |
| ADG3245BRU-REEL7 | 制造商:Analog Devices 功能描述:Bus Switch 1-Element CMOS 8-IN 20-Pin TSSOP T/R 制造商:Analog Devices 功能描述:BUS SWIT 1-ELEM 8-IN 20TSSOP - Tape and Reel 制造商:Rochester Electronics LLC 功能描述:2.2V/3.3V,8 BIT,2 PORT BUS SW/TRANS - Tape and Reel |
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