The 74HC238 is a high speed CMOS 3 to 8 line decoder.

The ULN2004 are high voltage, high current Darlington arrays each containing seven open collector Darlington pairs with common emitters. Each channel rated at 500 mA and can withstand peak currents of 600 mA. Suppression diodes are included for inductive load driving and the inputs are pinned opposite the outputs to simplify board layout.

The 74HC574 is an octal D-type flip-flops featuring separate D-type inputs for each flip-flop and 3-state outputs for bus-oriented applications.

The 4511  is a BCD to 7-segment decoder driver. Its function is to convert the logic states at the outputs of a BCD, or binary coded decimal, counter like the 4510 into signals which will drive a 7-segment display.

The 74HC165 are high-speed Si-gate CMOS devices that comply with JEDEC standard no. 7A. The 74HC165 are pin compatible with Low-power Schottky TTL (LSTTL).

The DAC0808 is an 8-bit monolithic digital-to-analog converter (DAC) featuring a full scale output current settling time of 150 ns while dissipating only 33 mW with ±5V supplies.

The 74HC02; 74HCT02 are high-speed Si-gate CMOS devices that comply with JEDEC standard no. 7A. They are pin compatible with Low-power Schottky TTL (LSTTL). The 74HC02; 74HCT02 provides a quad 2-input NOR function.

Each circuit functions as an inverter, but because of the Schmitt action, it has different input threshold levels for positive-going (VT+) and negative-going (VT–) signals. These circuits are temperature compensated and can be triggered from the slowest of input ramps and still give clean, jitter-free output signals.

The HEF4025B provides the positive triple 3-input NOR function.

The CD4016BC is a quad bilateral switch intended for the transmission or multiplexing of analog or digital signals.

These 8-bit shift registers feature gated serial inputs and an asynchronous clear. A low logic level at either input inhibits entry of the new data, and resets the first flip-flop to the low level at the next clock pulse, thus providing complete con- trol over incoming data.

The SN75176B differential bus transceiver provides an interface to RS485 multipoint transmission lines.

This is a common 555 timer/oscillator from TI.