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SN74AHC540PW 데이터시트(PDF) 10 Page - Texas Instruments |
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SN74AHC540PW 데이터시트(HTML) 10 Page - Texas Instruments |
10 / 27 page OE V GND A1 A8 Y1 Y8 Regulated 5.0 V CC µC or 5-V µC System logic LEDs System Logic SN54AHC540, SN74AHC540 SCLS260L – DECEMBER 1995 – REVISED OCTOBER 2015 www.ti.com 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 SN74AHC540 is a low drive CMOS device that can be used for a multitude of bus interface type applications where output ringing is a concern. The low drive and slow edge rates will minimize overshoot and undershoot on the outputs. The inputs accept voltages up to 5.5 V, which allows down translation to the VCC level. Figure 5 shows how the slower edges can reduce ringing on the output compared to higher drive parts like AC. 9.2 Typical Application Figure 4. Typical Application Schematic 9.2.1 Design Requirements This device uses CMOS technology and has balanced output drive. Care should be taken to avoid bus contention because it can drive currents that would exceed maximum limits. The high drive will also create fast edges into light loads so routing and load conditions should be considered to prevent ringing. 9.2.2 Detailed Design Procedure 1. Recommended Input Conditions: – For rise time and fall time specifications, see Δt/ΔV in the Recommended Operating Conditions table. – For specified high and low levels, see VIH and VIL in the Recommended Operating Conditions table. – Inputs are overvoltage tolerant allowing them to go as high as 5.5 V at any valid VCC. 2. Recommended Output Conditions: – Load currents should not exceed 25 mA per output and 75 mA total for the part. – Outputs should not be pulled above VCC. 10 Submit Documentation Feedback Copyright © 1995–2015, Texas Instruments Incorporated Product Folder Links: SN54AHC540 SN74AHC540 |
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