Texas Instruments SN54LS221 Dual Monostable Multivibrators With Schmitt-trigger Inputs JM38510/31402B2A

The SN54LS221 is a dual monostable multivibrator featuring Schmitt-trigger inputs, designed for reliable pulse generation in various applications. It offers negative-transition-triggered and positive-transition-triggered inputs, which can also serve as inhibit inputs. The device provides excellent noise immunity, with typical thresholds of 1.2 V for input noise and 1.5 V for VCC noise, ensuring stable operation even in noisy environments. Output pulse lengths can be adjusted from 35 ns to a maximum determined by external timing components, with a typical output pulse of 30 ns achievable using Rext = 2 k,Ѷ and Cext = 0. The device supports a wide range of timing capacitance (10 pF to 10 µF) and resistance (up to 100 k,Ѷ), allowing for flexibility in pulse-width stability across various temperature and voltage conditions. The SN54LS221 is compatible with other Texas Instruments multivibrators, making it a suitable drop-in replacement in existing designs. This product operates over a temperature range of -55°C to 125°C, making it suitable for harsh environments. The part number JM38510/31402B2A indicates a specific configuration within the series, ensuring compliance with military specifications.