Quad XNOR with open-drain outputs
The SN74HC266D is a quad 2-input XNOR (Exclusive NOR) gate from the 74HC family, with open-drain outputs — meaning the output can be pulled low actively but requires an external pull-up resistor to reach a high logic level, enabling wired-AND bus connections or level translation. It operates across a 2V to 6V supply range and is specified over the industrial temperature band of -40°C to 85°C, making it suitable for mixed-voltage logic interfaces in control and instrumentation boards.
23 ns propagation delay at 6V
Maximum propagation delay is 23 ns at 6V with a 50 pF load — this sets the data-rate ceiling for the gate in a synchronous bus; the open-drain output adds rise-time dependence on the pull-up resistor value, so the actual toggle rate at the receiver may be lower than the bare delay suggests. Quiescent current is a maximum of 2 µA, keeping the static power draw negligible in battery-powered or always-on logic sections. The high-level output current is not specified (listed as '-'), while the low-level sink capability is 5.2 mA — the pull-up resistor must be sized to stay within this sink current when the output is low, typically a few kilo-ohms for 5V operation.
Active lifecycle, ROHS3, 14-SOIC
Supplied in tube packaging; the MSL (moisture sensitivity level) for this package is typically Level 1, meaning no special dry-storage handling is required beyond standard shop-floor conditions — store the reels dry if re-bagged, but no bake-out is needed before reflow.