74HC257 Quad 2-input multiplexer IC

Description

74HC257 IC Quad 2-input multiplexer The 74HC257 is a high-performance CMOS quad 2-input multiplexer that packages four independent 2-to-1 data selectors plus a common select input and a 3-state output enable. Each section selects between its A and B input pair and presents the selected signal on the corresponding Y output. Built in the ’HC family, the device combines low static power consumption with switching speeds suitable for bus-oriented systems and medium-speed logic. Designed for bus interfacing and source-selection tasks, the 74HC257’s three-state outputs let multiple devices share a common bus without loading it when output enable (G) is asserted high. The chip accepts standard CMOS input levels across a wide supply range and is pin-compatible with related HC logic, easing substitution and mixed-family designs. Typical use includes routing data lines, selecting between memory or peripheral sources, and simple data-path multiplexing. Available in PDIP, SOIC, TSSOP and other packages with industry-standard pinouts, the 74HC257 is commonly used where compact, deterministic selection of parallel signals is required. Its low input currents and guaranteed noise margins make it a dependable building block for embedded systems, address/data multiplexing, and multi-source bus architectures. Features: Quad 2-input multiplexers with common select (A/B) and 3-state output enable (G). Wide operating supply range: 2 V to 6 V. Low power consumption (ICC typically very small; max ≈ 80 µA). Typical propagation delay for ’HC257 ≈ 9 ns (fast switching in HC family). 3-state outputs allow bus-sharing without loading when disabled. Low input current (typical ≤ 1 µA) and good noise margins for robust logic. Specifications: Parameter Value / Condition Part / Function: SN74HC257 Quad 2-input multiplexer, 3-state outputs. Recommended VCC (HC): 2.0 V to 6.0 V. Absolute-maximum VCC: −0.5 V to +7.0 V. propagation delay (tpd): ≈ 9 ns See switching tables for VCC dependency. Output drive: ±6 mA output drive at VCC = 5 V (typical rating). Input current (II): Typ ≤ 1 µA (VI = VCC or GND). ICC (supply current): Typ microamps; spec sheet shows up to ≈80 µA (max conditions). I/O tri-state leakage (IOZ): Specified in datasheet (µA range see electrical table). Input thresholds (VIH / VIL): VIH / VIL scale with VCC see recommended operating conditions. Operating temperature (TA): −40 °C to +85 °C (commercial), versions to −55 °C/+125 °C for military CDIP. Package options: PDIP, SOIC, SOP, TSSOP, CDIP, LCCC Pinout Diagram: Footprint Diagram: Applications: Bus-oriented systems and multi-source bus interfacing. Data path selection and routing in digital systems. Address/data multiplexing for memory or peripheral selection. Microcontroller / FPGA glue logic for source selection. Package Contents: 1x 74HC257 Quad 2-input multiplexer IC Datasheet

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