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SN74HC245DBRG4 Datasheet(PDF) 9 Page - Texas Instruments |
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SN74HC245DBRG4 Datasheet(HTML) 9 Page - Texas Instruments |
9 / 29 page 5 V LEDs, Relays, or other system boards OE V GND A1 A8 B1 B8 Regulated 5 V 3.3 V µC CC DIR or other system boards 5 V LEDs, Relays, or other system boards OE V GND A1 A8 B1 B8 Regulated 5 V or 3.3 V µC CC DIR 5 V LEDs, Relays, or other system boards µC SN54HC245, SN74HC245 www.ti.com SCLS131E – DECEMBER 1982 – REVISED SEPTEMBER 2015 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 SNx4HC245 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. 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. Outputs can be combined to produce higher drive but the high drive will also create faster 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 – Rise time and fall time specs: See ( Δt/ΔV) in the Recommended Operating Conditions. – Specified high and low levels: See (VIH and VIL) in the Recommended Operating Conditions. 2. Recommend 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. Copyright © 1982–2015, Texas Instruments Incorporated Submit Documentation Feedback 9 Product Folder Links: SN54HC245 SN74HC245 |
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