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TMUX1308 数据表(PDF) 22 Page - Texas Instruments

部件名 TMUX1308
功能描述  TMUX13xx 5-V, Bidirectional 8:1, 1-Channel and 4:1, 2-Channel Multiplexers with Injection Current Control
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制造商  TI [Texas Instruments]
网页  http://www.ti.com
标志 TI - Texas Instruments

TMUX1308 数据表(HTML) 22 Page - Texas Instruments

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8.2 Functional Block Diagram
The TMUX1308 is an 8:1, single-ended (1-channel), mux. The TMUX1309 is a 4:1, differential (2-channel) mux.
Each channel is turned on or turned off based on the state of the address lines and enable pin.
TMUX130 8
A0
A1
A2
EN
S1
D
S2
S3
S4
S5
S6
S7
S0
1-OF-8
DECODER
TMUX130 9
S0A
DB
S1A
S2A
S3A
S0B
S1B
S2B
S3B
DA
A0
A1
EN
1-OF-4
DECODER
Figure 8-12. TMUX1308 and TMUX1309 Functional Block Diagram
8.3 Feature Description
8.3.1 Bidirectional Operation
The TMUX1308 and TMUX1309 devices conduct equally well from source (Sx) to drain (Dx) or from drain (Dx)
to source (Sx). Each signal path has very similar characteristics in both directions so they can be used as both
multiplexers and demultiplexer to supports both analog and digital signals.
8.3.2 Rail-to-Rail Operation
The valid signal path input and output voltage for the TMUX1308 and TMUX1309 ranges from GND to VDD.
8.3.3 1.8 V Logic Compatible Inputs
The TMUX1308 and TMUX1309 support 1.8-V logic compatible control for all logic control inputs. The logic input
thresholds scale with supply but still provide 1.8-V logic control when operating at 5.5-V supply voltage. 1.8-V
logic level inputs allows the multiplexers to interface with processors that have lower logic I/O rails and
eliminates the need for an external voltage translator, which saves both space and BOM cost. The current
consumption of the TMUX1308 and TMUX1309 devices increase when using 1.8-V logic with higher supply
voltage. For more information on 1.8-V logic implementations refer to Simplifying Design with 1.8 V logic Muxes
and Switches.
8.3.4 Fail-Safe Logic
The TMUX1308 and TMUX1309 device have Fail-Safe Logic on the control input pins (EN, A0, A1, and A2)
allowing for operation up to 5.5-V, regardless of the state of the supply pin. This feature allows voltages on the
control pins to be applied before the supply pin, protecting the device from potential damage. Fail-Safe Logic
minimizes system complexity by removing the need for power supply sequencing on the logic control pins. For
example, the Fail-Safe Logic feature allows the select pins of the TMUX1308 and TMUX1309 to be ramped to
5.5-V while VDD = 0-V. Additionally, the feature enables operation of the multiplexers with VDD = 1.8-V while
allowing the select pins to interface with a logic level of another device up to 5.5-V, eliminating the potential need
for an external voltage translator.
8.3.5 Injection Current Control
Injection current is the current that is being forced into a pin by an input voltage (VIN) higher than the positive
supply (VDD + ∆V) or lower than ground (VSS). The current flows through the input protection diodes into
whichever supply of the device potentially compromising the accuracy and reliability of the system. Injected
currents can come from various sources depending on the application.
TMUX1308, TMUX1309
SCDS426C – MARCH 2020 – REVISED AUGUST 2020
www.ti.com
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Product Folder Links: TMUX1308 TMUX1309


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