The 74HC93 are high-speed Si-gate CMOS devices and are pin compatible with low power Schottky TTL (LSTTL). They are specified in compliance with JEDEC standard no. 7A.
The 74LS02 is a 14 Pin Quad 2-Input NOR Gate IC. NOR gates utilize advanced silicon-gate CMOS technology to achieve operating speeds similar to HC gates with the low power consumption of standard CMOS integrated circuits.
74LS04 is Hex Inverter NOT gate IC. It consists of six inverters which perform logical invert action. output of an inverter is complement of its input logic state i.e. when input is high its output is low and vice versa.
This 74LS06 monolithic hex inverter buffers/drivers feature high-voltage open-collector outputs to interface with high-level circuits (such as MOS), or for driving high-current loads, and are also characterized for use as inverter buffers for driving TTL inputs.
The 74LS109 devices contain two independent J-K positive-edge-triggered flip-flops. A low level at the preset or clear inputs sets or resets the outputs regardless of the levels of the other inputs.
74LS123 is a 16 Pin Dual Retriggerable Monostable Multivibrator?IC having 4.75V to 5.25V Operating Voltage with output current as 8mA. ?It can generate output pulses from a few nano-seconds to extremely long duration up to 100% duty cycle.