PCA9542APW/DG,118 NXP Semiconductors, PCA9542APW/DG,118 Datasheet - Page 6

• Manufacturer Part Number: PCA9542APW/DG,118
• Description: IC I2C MUX 2-CH 14-TSSOP
• Manufacturer: NXP Semiconductors

Specifications of PCA9542APW/DG,118

• Package / Case: 14-TSSOP
• Applications: 2-Channel I²C Multiplexer
• Interface: I²C, SMBus
• Voltage - Supply: 2.3 V ~ 5.5 V
• Mounting Type: Surface Mount
• Logic Family: I2C Bus
• High Level Output Current: 10 uA
• Low Level Output Current: 3 mA
• Propagation Delay Time: 0.3 ns
• Supply Voltage (max): 5.5 V
• Supply Voltage (min): 2.3 V
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Input Signal Type: SCL / SDA
• Interface Type: I2C Bus
• Maximum Power Dissipation: 400 mW
• Mounting Style: SMD/SMT
• Output Type: SCx / SDx
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant
• Other names: 935286937118; PCA9542APW/DG-T; PCA9542APW/DG-T

NXP Semiconductors
PCA9542A_4
Product data sheet
6.5 Voltage translation
The pass gate transistors of the PCA9542A are constructed such that the V
be used to limit the maximum voltage that will be passed from one I
Figure 6
was generated using the data specified in
data sheet). In order for the PCA9542A 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 PCA9542A 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 6.
(1) maximum
(2) typical
(3) minimum
6, we see that V
shows the voltage characteristics of the pass gate transistors (note that the graph
Pass gate voltage versus supply voltage
V
o(sw)
(V)
o(sw)(max)
Rev. 04 — 15 June 2009
5.0
4.0
3.0
2.0
1.0
2.0
2.5
will be at 2.7 V when the PCA9542A supply voltage is
3.0
2-channel I
3.5
Section 11 “Dynamic characteristics”
4.0
2
C-bus multiplexer and interrupt logic
(1)
(2)
(3)
4.5
002aaa964
5.0
V
DD
(V)
5.5
PCA9542A
2
C-bus to another.
Figure
© NXP B.V. 2009. All rights reserved.
o(sw)
DD
o(sw)
should be
13).
voltage can
2
voltage
C/SMBus
of this
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