Dual 5-input NOR gate in 14-SOIC — tight logic decoding in one package
The Texas Instruments SN74S260D packs two independent 5-input NOR gates into a single 14-SOIC surface-mount package. Each gate performs the NOR function on five inputs, producing a low output only when all inputs are high — useful for wide-address decoding, glitch-free OR-ing, or compact logic trees where board space is tight. The 74S Schottky family delivers a propagation delay of 6 ns at 5 V driving a 15 pF load, making it one of the faster NOR options for 5 V logic systems.
Supply rail and temperature — 5 V only, indoor environments
This part operates from a 4.75 V to 5.25 V supply — strictly a 5 V rail part. The input thresholds are fixed for TTL-compatible 5 V logic.
Output drive and loading — 1 mA high, 20 mA low
The output current capability is asymmetric: 1 mA sourcing (logic high) and 20 mA sinking (logic low). This is typical for Schottky TTL and means the gate can drive a few standard TTL inputs or a low-power LED, but not a heavy load. The 6 ns propagation delay is specified at 5 V with a 15 pF load — stay within that capacitance budget to maintain timing margin.