PCA9549PW NXP [NXP Semiconductors], PCA9549PW Datasheet - Page 7

• Manufacturer Part Number: PCA9549PW
• Description: Octal bus switch with individually I2C-bus controlled enables
• Manufacturer: NXP [NXP Semiconductors]

NXP Semiconductors
PCA9549_2
Product data sheet
Figure 7
PCA9549 is only tested at the points specified in
order for the PCA9549 to act as a voltage translator, the V
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
to effectively clamp the downstream bus voltages. Looking at
(maximum) will be at 2.7 V when the PCA9549 supply voltage is 3.5 V or lower so the
PCA9549 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
Fig 7.
(1) maximum.
(2) typical.
(3) minimum.
shows the voltage characteristics of the pass gate transistors (note that the
V
o(sw)
voltage versus V
V
o(sw)
(V)
5.0
4.0
3.0
2.0
1.0
Rev. 02 — 13 July 2009
Octal bus switch with individually I
2.0
2.5
DD
3.0
3.5
4.0
Figure
Section 9 “Static
(1)
(2)
(3)
o(sw)
4.5
16).
should be equal to or below 2.7 V
002aaa964
5.0
V
o(sw)
DD
(V)
Figure
2
5.5
voltage should be equal to,
C-bus controlled enables
characteristics”). In
7, we see that V
PCA9549
© NXP B.V. 2009. All rights reserved.
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o(sw)