BUY SN74LS221NSR https://www.utsource.net/itm/p/5182547.html
DUAL MONOSTABLE MULTIVIBRATORS WITH SCHMITT-TRIGGER INPUTS
Description: Quadruple Positive-Edge-Triggered D Flip-Flops with Clear and Complementary Outputs Features: Inputs Include Clamp Diodes Outputs Source/Sink 24 mA Outputs Directly Interface to CMOS, NMOS, and TTL Operating Voltage Range of 4.75 V to 5.25 V Low Power Consumption, 20-μA Max ICC In Compliance with the JEDEC Standard JESD13-B Available in 16-Pin Plastic Small-Outline (D) Packages Application: Frequency Division Shift Registers Storage Registers Data Processing Pattern Recognition (For reference only)