Raspberry VI (Posts about pinouts)

ICSP Bus Pinouts and Explanation

Mike Ray — Mon, 08 Mar 2021 13:24:24 GMT

The ICSP (In Circuit Serial Programming) bus constists of six pins in a 2 x 3 box. Arranged like the cans in a six-pack.

The pins are 1 and 2 in the top row, left to right, 3 and 4 in the centre row, left to right and pins 5 and 6 in the bottom row, left to right. As shown in the following table.

4001 CMOS Quad-2-input NOR Gate Chip Pinouts

Mike Ray — Mon, 01 Mar 2021 11:04:32 GMT

This blog post shows the truth table for a 2 input NOR gate and the pinouts of the common 4001 CMOS quad 2 input NOR gate chip.

With thanks to Anthony McCloskey, from the raspberry-vi mailing list for the suggestion of this post and the pinouts.

741 Op-amp Pinouts

Mike Ray — Sat, 27 Feb 2021 11:44:11 GMT

The 741 operational amplifier is one of those chips you will probably encounter in college or high school technology and electronics classes.

It has been around almost as long as integrated circuits.

The name 'operational amplifier' comes from the fact that the amplifier was used in early analogue computers to perform 'operations' such as adding and subtracting analogue values.

The text below explains the packaging of a 741 operational amplifier chip in the classic eight pin DIL chip package, and the table shows the pinouts.

DIL = 'Dual in line'.

555 Timer Chip Pinouts

Mike Ray — Sat, 27 Feb 2021 10:11:09 GMT

The 555 timer chip is one of the most ubiquitous chips seen in hobby and college electronics over about the last 45 years or so. Certainly before digital electronics and microcontrollers made such an impact.

First invented in 1972, this chip is probably a contender for the most manufactured chip in the history of integrated circuits.

The text below explains the packaging of a 555 timer in the classic eight pin DIL chip package, and the table shows the pinouts.

DIL = ‘Dual in line’.

7400 TTL Quad-2-input NAND Gate Chip Pinouts

Mike Ray — Fri, 26 Feb 2021 19:08:48 GMT

For many years the 7400 quad 2 input NAND gate chip was the backbone of digital electronics. Because using a mass of NAND gates it is possible to construct almost any digital system. Although by today’s standards it would not be the pinnacle of miniaturisation.

This post shows the truth table for a 2 input NAND gate and the pinouts of the common 7400 quad 2 input NAND gate chip.

With thanks to Anthony McCloskey, from the raspberry-vi mailing list for the suggestion of this post and the pinouts.