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BUY LS1240A https://www.utsource.net/itm/p/88571.html
Electronic Two-tone Ringer
Description: The LS1240A is a high-speed, low-power, CMOS logic device. It is a quad 2-input NAND gate with Schmitt-trigger inputs. Features: High-speed operation: tpd = 3.5 ns (typ.) at VCC = 5V Low power consumption: ICC = 1 μA (max.) at TA = 25°C Wide operating voltage range: VCC (opr) = 2 to 6V Inputs compatible with TTL levels Outputs source/sink 24 mA Schmitt-trigger action at all inputs Outputs open-drain Package: SOP8 Applications: Signal conditioning Clock and timing circuits Pulse generation Interface circuits Digital logic systems (For reference only)