7438 Quad 2-Input NAND Buffer With Open-Collector Outputs

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7438 Quad 2-Input NAND Buffer With Open-Collector Outputs The 7438 is a quad 2-input NAND buffer IC designed for digital logic applications requiring open-collector output functionality. It contains four independent NAND gates, each capable of handling two input signals and producing an inverted logical output. Features : Four independent 2-input positive-NAND buffer gates in a single 14-pin DIP package. Open-collector outputs that allow wired-OR and wired-AND configurations, simplifying complex gate implementations. Wide supply voltage range from 4.75V to 5.25V, compatible with standard 5V TTL systems. High-speed operation with a maximum propagation delay of 32ns at 5V and 45pF load capacitance. Sink output current capability of up to 24mA, suitable for driving LEDs, relays, and bus lines. Specifications: Parameter Value Logic Type NAND Gate – Buffer Number of Circuits 4 Number of Inputs 2 (per gate) Output Type Open Collector Supply Voltage (VCC) 4.75VDC to 5.25VDC Input Logic Level – Low 0.8V (Max.) Input Logic Level – High 2V (Min.) Output Logic Level – Low 0.4V (Max.) Output Logic Level – High 5.5V (Max.) Output Current (Low) 24mA (Sink) Propagation Delay (tPLH / tPHL) 32ns @ 5V, 45pF Operating Temperature 0°C to 70°C Mounting Type Through Hole Package 14-PDIP Pin Configuration: Foot print: Applications: Digital logic circuit design. Wired-AND / wired-OR bus systems. LED and indicator driving circuits. Interface circuits between logic families. Industrial control logic. Embedded system signal conditioning. Educational and prototyping applications. Package Include: 1x 7438 Quad 2-Input NAND Buffer With Open-Collector Outputs. Datasheet: SN74LS38N .