ADG3242BRJ-REEL7 Analog Devices Inc, ADG3242BRJ-REEL7 Datasheet - Page 12

• Manufacturer Part Number: ADG3242BRJ-REEL7
• Description: IC SW BUS CTRL 2.5/3.3V SOT23-8
• Manufacturer: Analog Devices Inc
• Type: Bus Switchr

Specifications of ADG3242BRJ-REEL7

• Rohs Status: RoHS non-compliant
• Circuit: 2 x 1:1
• Independent Circuits: 1
• Voltage Supply Source: Single Supply
• Voltage - Supply: 2.5V, 3.3V
• Mounting Type: Surface Mount
• Package / Case: SOT-23-8
• Number Of Bits: 2
• Number Of Elements: 1
• Technology: CMOS
• High Level Output Current: -25mA
• Low Level Output Current: 25mA
• On Resistance: 12(Typ)Ohm
• Propagation Delay Time: 4.6ns
• Package Type: SOT-23
• Operating Temp Range: -40C to 85C
• Operating Temperature Classification: Industrial
• Operating Supply Voltage (min): 2.3V
• Operating Supply Voltage (typ): 2.5/3.3V
• Operating Supply Voltage (max): 3.6V
• Quiescent Current: 200uA
• Pin Count: 8
• Mounting: Surface Mount
• Operating Temperature: -
• Current - Output High, Low: -
• Lead Free Status / Rohs Status: Not Compliant

ADG3242
BUS SWITCH APPLICATIONS
MIXED VOLTAGE OPERATION, LEVEL
TRANSLATION
Bus switches provide an ideal solution for interfacing between
mixed voltage systems. The ADG3242 is suitable for applications
where voltage translation from 3.3 V technology to a lower voltage
technology is needed. This device translates from 3.3 V to 1.8 V,
from 2.5 V to 1.8 V, or from a bidirectional 3.3 V directly to 2.5 V.
Figure 28 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 micro-
processor. The microprocessor does not have 3.3 V tolerant inputs,
therefore, placing the ADG3242 between the two devices allows
the devices to communicate easily. The bus switch directly connects
the two blocks, therefore introducing minimal propagation delay,
timing skew, or noise.
3.3 V TO 2.5 V TRANSLATION
When V
0 V to V
voltage threshold below the V
is limited to 2.5 V, as shown in Figure 30. This device can be used
for translation from 2.5 V to 3.3 V devices and also between two
3.3 V devices.
Figure 28. Level Translation Between a 3.3 V ADC and a 2.5 V Microprocessor
CC
CC
3.3V ADC
Figure 29. 3.3 V to 2.5 V Voltage Translation, SEL = V
Figure 30. 3.3 V to 2.5 V Voltage Translation, SEL = V
3.3V
2.5V
, the maximum output signal is clamped to within a
3.3V
is 3.3 V ( SEL = 3.3 V) and the input signal range is
2.5V
V
0V
OUT
ADG3242
SWITCH
3.3V
INPUT
3.3V
CC
supply. In this case, the output
3.3V SUPPLY
SEL = 3.3V
3.3V
MICROPROCESSOR
V
IN
2.5V
2.5V
2.5V
2.5V
CC
CC
Rev. A | Page 12 of 16
2.5 V TO 1.8 V TRANSLATION
When V
0 V to V
a voltage threshold below the V
is limited to approximately 1.8 V, as shown in Figure 32.
3.3 V TO 1.8 V TRANSLATION
The ADG3242 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. The SEL pin is an active low control pin. SEL activates inter-
nal circuitry in the ADG3242 that allows voltage translation
between 3.3 V devices and 1.8 V devices.
When V
maximum output signal is clamped to 1.8 V, as shown in Figure 34.
To do this, the SEL pin must be tied to Logic 0. If SEL is unused,
it can be tied directly to V
CC
CC
Figure 31. 2.5 V to 1.8 V Voltage Translation, SEL = 2.5 V
CC
Figure 32. 2.5 V to 1.8 V Voltage Translation, SEL = V
Figure 33. 3.3 V to 1.8 V Voltage Translation, SEL = 0 V
Figure 34. 3.3 V to 1.8 V Voltage Translation, SEL = 0 V
2.5V
3.3V
, the maximum output signal is also clamped within
is 2.5 V ( SEL = 2.5 V) and the input signal range is
is 3.3 V and the input signal range is 0 V to V
1.8V
1.8V
V
V
0V
0V
OUT
OUT
CC
ADG3242
ADG3242
SWITCH
SWITCH
INPUT
INPUT
.
2.5V
3.3V
CC
supply. In this case, the output
3.3V SUPPLY
2.5V SUPPLY
SEL = 2.5V
SEL = 0V
2.5V
3.3V
V
V
IN
IN
1.8V
1.8V
CC
CC
CC
, the