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Giải thích chi tiết về linh kiện  SN74HCS259-Q1 Automotive 8-Bit Addressable Latches with Schmitt-Trigger Inputs
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9 Application and Implementation
Note
Information in the following applications sections is not part of the TI component specification, and TI
does not warrant its accuracy or completeness. TI’s customers are responsible for determining
suitability of components for their purposes. Customers should validate and test their design
implementation to confirm system functionality.
9.1 Application Information
The SN74HCS259-Q1 has four modes of operation. In this application, the 8-line demultiplexer mode is used to
send data to one of eight possilbe desinations.
At system power-on, latched outputs are in an unknown state. The CLR input is held low while the G input is
held high to clear the latches for operation. At this time, all outputs are in the low state.
An output is selected by setting S2, S1, and S0 as per the Latch Selection Table. After selection, the channel is
activated by switching G to low. The logic value at the D input will appear at the selected output, allowing data
transmission only to the selected device.
When the channel communication is complete, the G input is set to high to prevent erronous outputs while the
address inputs are changed, then switched back to low again to send data to the newly selected device.
9.2 Typical Application
System Controller
Q0
Q1
Q2
Q3
Q4
Q5
Q6
Q7
D
G
CLR
0.1µF
VCC
5V
Device 1
Device 2
Device 3
Device 4
Device 5
Device 6
Device 7
Device 8
S0
S1
S2
GND
Figure 9-1. Typical application block diagram
9.2.1 Design Requirements
9.2.1.1 Power Considerations
Ensure the desired supply voltage is within the range specified in the Recommended Operating Conditions. The
supply voltage sets the device's electrical characteristics as described in the Electrical Characteristics.
The positive voltage supply must be capable of sourcing current equal to the total current to be sourced by all
outputs of the SN74HCS259-Q1 plus the maximum static supply current, ICC, listed in Electrical Characteristics
and any transient current required for switching. The logic device can only source as much current as is provided
by the positive supply source. Be sure not to exceed the maximum total current through VCC listed in the
Absolute Maximum Ratings.
SN74HCS259-Q1
SCLS815 – JULY 2020
www.ti.com
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