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SN74HCS244-Q1 Datenblatt(PDF) 10 Page - Texas Instruments |
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SN74HCS244-Q1 Datenblatt(HTML) 10 Page - Texas Instruments |
10 / 18 page 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 Submit Document Feedback Copyright © 2020 Texas Instruments Incorporated Product Folder Links: SN74HCS244-Q1 |
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