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SN74HCS244-Q1 データシート(PDF) 10 Page - Texas Instruments

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部品番号. SN74HCS244-Q1
部品情報  SN74HCS244-Q1 Automotive Octal Buffers and Line Drivers With Schmitt-Trigger Inputs and 3-State Outputs
ダウンロード  18 Pages
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メーカー  TI [Texas Instruments]
ホームページ  http://www.ti.com
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SN74HCS244-Q1 Datasheet(HTML) 10 Page - Texas Instruments

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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 SN74HCS244-Q1 can be used to drive signals over relatively long traces or transmission lines. In order to
reduce ringing caused by impedance mismatches between the driver, transmission line, and receiver, a series
damping resistor placed in series with the transmitter’s output can be used. The plot in the Application Curve
section shows the received signal with three separate resistor values. Just a small amount of resistance can
make a significant impact on signal integrity in this type of application.
9.2 Typical Application
Z0
Rd
1A1
1Y1
System
Controller
1A1
1Y1
Transmitter
Receiver
L > 12 cm
Peripheral
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 SN74HCS244-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.
The ground must be capable of sinking current equal to the total current to be sunk by all outputs of the
SN74HCS244-Q1 plus the maximum supply current, ICC, listed in Electrical Characteristics, and any transient
current required for switching. The logic device can only sink as much current as can be sunk into its ground
connection. Be sure not to exceed the maximum total current through GND listed in the Absolute Maximum
Ratings.
The SN74HCS244-Q1 can drive a load with a total capacitance less than or equal to 50 pF while still meeting all
of the datasheet specifications. Larger capacitive loads can be applied, however it is not recommended to
exceed 50 pF.
The SN74HCS244-Q1 can drive a load with total resistance described by RL ≥ VO / IO, with the output voltage
and current defined in the Electrical Characteristics table with VOH and VOL. When outputting in the high state,
the output voltage in the equation is defined as the difference between the measured output voltage and the
supply voltage at the VCC pin.
Total power consumption can be calculated using the information provided in CMOS Power Consumption and
Cpd Calculation.
Thermal increase can be calculated using the information provided in Thermal Characteristics of Standard Linear
and Logic (SLL) Packages and Devices.
SN74HCS244-Q1
SCLS821 – JULY 2020
www.ti.com
10
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