PCA9548AD,112 NXP Semiconductors, PCA9548AD,112 Datasheet - Page 8

• Manufacturer Part Number: PCA9548AD,112
• Description: IC I2C SWITCH 8CH 24-SOIC
• Manufacturer: NXP Semiconductors

Specifications of PCA9548AD,112

• Applications: Translating Switch
• Interface: I²C, SMBus
• Voltage - Supply: 2.3 V ~ 3.6 V, 4.5 V ~ 5.5 V
• Package / Case: 24-SOIC (7.5mm Width)
• Mounting Type: Surface Mount
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 568-3383-5; 935275815112; PCA9548AD

NXP Semiconductors
PCA9548A_3
Product data sheet
6.5 Voltage translation
The pass gate transistors of the PCA9548A are constructed such that the V
be used to limit the maximum voltage that will be passed from one I
Figure 7
PCA9548A is only tested at the points specified in
this data sheet). In order for the PCA9548A to act as a voltage translator, the V
voltage should be equal to, or lower than the lowest bus voltage. For example, if the main
bus was running at 5 V, and the downstream buses were 3.3 V and 2.7 V, then V
should be equal to or below 2.7 V to effectively clamp the downstream bus voltages.
Looking at
voltage is 3.5 V or lower, so the PCA9548A supply voltage could be set to 3.3 V. Pull-up
resistors can then be used to bring the bus voltages to their appropriate levels (see
Figure
More Information can be found in Application Note AN262: PCA954X family of I
multiplexers and switches .
Fig 7.
(1) maximum
(2) typical
(3) minimum
14).
shows the voltage characteristics of the pass gate transistors (note that the
Pass gate voltage versus supply voltage
Figure
7, we see that V
V
o(sw)
(V)
5.0
4.0
3.0
2.0
1.0
Rev. 03 — 7 July 2009
2.0
2.5
o(sw)(max)
3.0
3.5
will be at 2.7 V when the PCA9548A supply
4.0
(1)
(2)
(3)
Section 10 “Static characteristics”
4.5
8-channel I
002aaa964
5.0
V
DD
(V)
5.5
2
C-bus switch with reset
PCA9548A
2
C-bus to another.
© NXP B.V. 2009. All rights reserved.
DD
voltage can
2
o(sw)
C/SMBus
o(sw)
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