PCA9547D,118 NXP Semiconductors, PCA9547D,118 Datasheet - Page 8

• Manufacturer Part Number: PCA9547D,118
• Description: IC MUX 8CH I2C BUS 24SOIC
• Manufacturer: NXP Semiconductors

Specifications of PCA9547D,118

• Package / Case: 24-SOIC (7.5mm Width)
• Applications: Translating Multiplexer
• Interface: I²C, SMBus
• Voltage - Supply: 2.3 V ~ 3.6 V, 4.5 V ~ 5.5 V
• Mounting Type: Surface Mount
• Product: Decoders, Encoders, Multiplexers & Demultiplexers
• Number Of Lines (input / Output): 8.0 / 1.0
• Propagation Delay Time: 0.3 ns at 2.3 V to 5.5 V
• Supply Voltage (max): 5.5 V
• Supply Voltage (min): 2.3 V
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Mounting Style: SMD/SMT
• Number Of Input Lines: 8.0
• Number Of Output Lines: 1.0
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant
• Other names: 935280788118; PCA9547D-T; PCA9547D-T

NXP Semiconductors
PCA9547_3
Product data sheet
6.5 Voltage translation
The pass gate transistors of the PCA9547 are constructed such that the V
be used to limit the maximum voltage that will be passed from one I
Figure 7
PCA9547 is only tested at the points specified in
data sheet). In order for the PCA9547 to act as a voltage translator, the V
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
equal to or below 2.7 V to effectively clamp the downstream bus voltages. Looking at
Figure
3.5 V or lower so the PCA9547 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
More information can be found in Application Note AN262, PCA954X family of I
multiplexers and switches .
Fig 7.
(1) maximum
(2) typical
(3) minimum
7, we see that V
shows the voltage characteristics of the pass gate transistors (note that the
Pass gate voltage as a function of supply voltage
V
o(mux)
(V)
o(mux)(max)
5.0
4.0
3.0
2.0
1.0
Rev. 03 — 10 July 2009
2.0
2.5
will be at 2.7 V when the PCA9547 supply voltage is
3.0
3.5
4.0
8-channel I
Section 10 “Static characteristics”
(1)
(2)
(3)
4.5
002aab802
5.0
V
2
DD
C-bus multiplexer with reset
(V)
5.5
2
C-bus to another.
PCA9547
Figure
© NXP B.V. 2009. All rights reserved.
o(mux)
o(mux)
DD
voltage can
14).
should be
2
voltage
C/SMBus
of this
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