參數(shù)資料
型號: ADG3257BRQZ
廠商: Analog Devices Inc
文件頁數(shù): 2/12頁
文件大?。?/td> 0K
描述: IC MUX QUAD 3.3/5V HS 16-QSOP
標準包裝: 98
類型: 多路復(fù)用器/多路分解器
電路: 4 x 1:2
獨立電路: 1
電壓電源: 單電源
電源電壓: 3.3V,5V
工作溫度: -40°C ~ 85°C
安裝類型: 表面貼裝
封裝/外殼: 16-SSOP(0.154",3.90mm 寬)
供應(yīng)商設(shè)備封裝: 16-QSOP
包裝: 管件
ADG3257
Rev. E | Page 10 of 12
APPLICATIONS INFORMATION
MIXED VOLTAGE OPERATION, LEVEL TRANSLATION
Bus switches can be used to provide a solution for mixed voltage
systems where interfacing bidirectionally between 5 V and 3.3 V
devices is required. To interface between 5 V and 3.3 V buses,
an external diode is placed in series with the 5 V power supply
as shown in Figure 15.
BE
5V
3.3V
VCC = 5V
5V MEMORY
5V I/O
3.3V CPU/DSP/
MICROPROCESSOR/
MEMORY
4-
0
15
3.3V
02
91
Figure 15. Level Translation Between 5 V and 3.3 V Devices
The diode drops the internal gate voltage down to 4.3 V. The
bus switch limits the voltage present on the output to
VCC External Diode Drop = VTH
Therefore, assuming a diode drop of 0.7 V and a VTH of 1 V, the
output voltage is limited to 3.3 V with a logic high.
3.3V
0V
5V
VOUT
5V SUPPLY
ADG3257
2.5V
SW
IT
C
H
OU
TP
U
T
SWITCH
INPUT
VIN
02
91
4-
0
16
Figure 16. Input Voltage to Output Voltage
Similarly, the device could be used to translate bidirectionally
between 3.3 V to 2.5 V systems. In this case, there is no need for
an external diode. The internal VTH drop is 1 V, so with a
VCC = 3.3 V the bus switch limits the output voltage to
VCC 1 V = 2.3 V
V
3.3V
2.5V
3.3V
2.5V
0V
3.3V
OUT
SW
IT
C
H
OU
TP
U
T
SWITCH
INPUT
VIN
3.3V SUPPLY
02
914
-01
7
Figure 17. 3.3 V to 2.5 V Level Translation Using the ADG3257 Bus Switch
MEMORY SWITCHING
This quad bus switch may be used to allow switching between
different memory banks, thus allowing additional memory and
decreasing capacitive loading. Figure 18 illustrates the
ADG3257 in such an application.
SDRAM NO. 1
SDRAM NO. 2
SDRAM NO. 7
SDRAM NO. 8
BE
S
LOGIC
02
91
4-
0
18
Figure 18. Allows Additional Memory Modules Without Added Drive or Delay
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