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7401 Quad 2-input Nand Gates

7401 Quad 2-input NAND gate Nand ANSI Symbol
Nand ICE Symbol
Boolean equation: y= AB
The 7401 also consists of 4 (quad) inverted AND gates (Nand). These are in the opposite direction than the 7400 this means it is not pin compatible with the 7400. Nand is the compliment of the output of a regular AND gate. In boolean algebra any Boolean equation can be represented with Nand gates alone.

74LS:

How to Test Almost Anything Electronic (Paperback) by Delton T. Horn

It’s a Low-power Schottky family which uses fast Transistor-Transistor Logic (TTL) but requires more power than later families. However later Ic’s are still called TTL even though they do not use TTL anymore. It uses a supply voltage of 5V ±0.25V and should be smoothed with small capacitors in the range of 0.033uF to 0.1uF linked directly over the supply pins as close to the IC as possible to remove power spikes caused by the switching circuits inside the IC itself. all unused pins should be connected to Vcc (+V) to insure that the IC does not pick up ambient noise. The output of a 74LS can drive up to 10 other 74LS IC inputs but if more inputs need to be driven you should either use a transistor or a BUS-Driver IC. Theoutput can only source +/- 2mA and should use a transistor to drive larger outputs,it can however sink up to 16mA of current and can light a LED which needs 10mA to emit light directly in the inverted state. The time taken to travel through a Gate state is about 10nS and can run at about 25MHz.

 

74HC:

uses CMOS logic with the low power consumption of 4000 series IC’s and the high speed of TTL. They have the same pin arrangements as the older 74LS family however the 74HC inputs cannot be driven by 74LS outputs as there low voltage range is not compatible and you should use the 74HCT instead with 74LS compatible inputs. The Inputs have very high impedance and will not affect the circuit they are connected to however this also means that any unconnected input will switch between a high and a low state very rapidly causing an increase in supply current and the ic to behave undesirably. This IC needs a supply voltage of 2 to 6V and is tolerable to voltage spikes. The outputs can both sink and source about 4mA and you should again use either a transistor or a BUS-Driver to switch larger circuits. the output can drive many inputs of 74HC class IC’s quite easily. this IC also has a switching time of about 10nS.

74HCT:

like the 74HC it has high speed TTL and low power consumption of CMOS. The 74HCT can be safely used in the same circuit as 74LS this means it can be used as a direct low power replacements for the older 74LS series. The only problem is that the 74HCT has a lower immunity to noise, but this usually is not a problem in most systems. The Ic needs a supply of 4.5V to 5.5V so its best to use a smoothing circuit for the supply voltage. both the 74HC and 74HCT series IC’s are static sensitive. Touching a pin while your body holds a charge can damage the IC. most common IC’s are quite tolerant but it is advisable to discharge yourself with an anti-static wrist strap connected to earth or ground yourself quite regally by touching something metal that is earthed before handling them. ICs should be stored in protective packaging until you are ready to use them. if you are designing a new circuit you should use the 74HC family.


List of other NAND gates:

7430: 8 Input NAND Gate

74133: 13-Input NAND gate

74134: 12-Input NAND gate with Three-state Output

7413: Dual Schmitt trigger 4-input NAND gate
7420: Dual 4-input NAND gate
7422: Dual 4-Input NAND gate with open collector outputs
7440: Dual 4-input NAND Buffer
74140: Dual 4-input NAND Line Driver

7410: Triple 3-input NAND gate
7412: Triple 3-input NAND gate with open collector outputs

7400 Quad 2-input NAND gate
7401 Quad 2-input NAND gate with open collector outputs
7403: Quad 2-input NAND gate with open collector outputs (different pinout than 7401)
7424: Quad 2-input NAND gate gates with schmitt-trigger line-receiver inputs.
7426: Quad 2-input NAND gate with 15V open collector outputs
7437: Quad 2-input NAND Buffer
7438: Quad 2-input NAND Buffer with open collector outputs
7439 Quad 2-input NAND Buffer
74132: Quad 2-input NAND Schmitt trigger
74804: Hex 2-input NAND Drivers

4011 – Buffered Quad 2-Input NAND gate
4012 – Dual 4-input NAND gate
4023 – Triple 3-input NAND
4044 – Quad NAND R/S ((tristate) outputs)
4068 – 8-input NAND gate
4093 – Quad 2-input Schmitt trigger NAND gate
4572 – Hex gate : quad NOT, single NAND, single NOR
40107 – dual 2-input NAND buffer/driver

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7400 Quad 2 input Nand gate

7400 ic ANSI Symbol
ICE Symbol
Boolean equation: y= AB
The 7400 consists of 4 (quad) inverted AND gates(Nand) this is the compliment of the output of a regular AND gate. In boolean algebra any Boolean equation can be represented with Nand gates alone.

74LS:

Electronics for Dummies – UK Edition (Paperback) by Dickon Ross, Cathleen Shamieh & Gordon McComb

It’s a Low-power Schottky family which uses fast Transistor-Transistor Logic (TTL) but requires more power than later families. However later Ic’s are still called TTL even though they do not use TTL anymore. It uses a supply voltage of 5V �0.25V and should be smoothed with small capacitors in the range of 0.033uF to 0.1uF linked directly over the supply pins as close to the IC as possible to remove power spikes caused by the switching circuits inside the IC itself. all unused pins should be connected to Vcc (+V) to insure that the IC does not pick up ambient noise. The outputof a 74LS can drive up to 10 other 74LS IC inputs but if more inputs need to be driven you should either use a transistor or a BUS-Driver IC. The output can only source +/- 2mA and should use a transistor to drive larger outputs,it can however sink up to 16mA of current and can light a LED which needs 10mA to emit light directly in the inverted state. The time taken to travel through a Gate state is about 10nS and can run at about 25MHz.


74HC:

uses CMOS logic with the low power consumption of 4000 series IC’s and the high speed of TTL. They have the same pin arrangements as the older 74LS family however the 74HC inputs cannot be driven by 74LS outputs as there low voltage range is not compatible and you should use the 74HCT instead with 74LS compatible inputs. The Inputs have very high impedance and will not affect the circuit they are connected to however this also means that any unconnected input will switch between a high and a low state very rapidly causing an increase in supply current and the ic to behave undesirably. This IC needs a supply voltage of 2 to 6V and is tolerable to voltage spikes. The outputs can both sink and source about 4mA and you should again use either a transistor or a BUS-Driver to switch larger circuits. the output can drive many inputs of 74HC class IC’s quite easily. this IC also has a switching time of about 10nS.


74HCT:

like the 74HC it has high speed TTL and low power consumption of CMOS. The 74HCT can be safely used in the same circuit as 74LS this means it can be used as a direct low power replacements for the older 74LS series. The only problem is that the 74HCT has a lower immunity to noise, but this usually is not a problem in most systems. The Ic needs a supply of 4.5V to 5.5V so its best to use a smoothing circuit for the supply voltage. both the 74HC and 74HCT series IC’s are static sensitive. Touching a pin while your body holds a charge can damage the IC. most common IC’s are quite tolerant but it is advisable to discharge yourself with an anti-static wrist strap connected to earth or ground yourself quite regally by touching something metal that is earthed before handling them. ICs should be stored in protective packaging until you are ready to use them. if you are designing a new circuit you should use the 74HC family.


List of other NAND gates:

7430: 8 Input NAND Gate

74133: 13-Input NAND gate

74134: 12-Input NAND gate with Three-state Output

7413: Dual Schmitt trigger 4-input NAND gate
7420: Dual 4-input NAND gate
7422: Dual 4-Input NAND gate with open collector outputs
7440: Dual 4-input NAND Buffer
74140: Dual 4-input NAND Line Driver

7410: Triple 3-input NAND gate
7412: Triple 3-input NAND gate with open collector outputs

7400 Quad 2-input NAND gate
7401 Quad 2-input NAND gate with open collector outputs
7403: Quad 2-input NAND gate with open collector outputs (different pinout than 7401)
7424: Quad 2-input NAND gate gates with schmitt-trigger line-receiver inputs.
7426: Quad 2-input NAND gate with 15V open collector outputs
7437: Quad 2-input NAND Buffer
7438: Quad 2-input NAND Buffer with open collector outputs
7439 Quad 2-input NAND Buffer
74132: Quad 2-input NAND Schmitt trigger
74804: Hex 2-input NAND Drivers

4011 – Buffered Quad 2-Input NAND gate
4012 – Dual 4-input NAND gate
4023 – Triple 3-input NAND
4044 – Quad NAND R/S ((tristate) outputs)
4068 – 8-input NAND gate
4093 – Quad 2-input Schmitt trigger NAND gate
4572 – Hex gate : quad NOT, single NAND, single NOR
40107 – dual 2-input NAND buffer/driver

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Raspberry Pi 3

Did we not just get the Raspberry Pi 2? Well this was a surprise this morning getting into work and seeing news splashed all over the interwebs about the new Raspberry Pi 3 I have not even finished playing around with the Rpi2 and now there is a new one. Well let’s have a quick look at the Specs for this new single board computer.

Announced on 29th February 2016 by Eben Upton on the Raspberry Pi blog.

 

 

Raspberry Pi 3
Image courtesy of Raspberrypi.org

buynow

 

 

 

Quick comparison

Component Rpi 1- model B Rpi 1Pi – model B+ Rpi 2 Rpi 3
Release Date June 2012 July 2014 February 2015 February 2016
CPU 700 MHz single-core ARM1176JZF-S 900 MHz quad-core ARM Cortex-A7 1.2GHz 64-bit quad-core ARM Cortex-A53 CPU
Memory 256 MB (shared with GPU) 512 MB (shared with GPU) 1 GB (shared with GPU) 1 GB
GPU Broadcom VideoCore IV @ 250 MHz Broadcom VideoCore IV @ 400 MHz

Peripherals and Ports

2x USB 2.0

HDMI

Analog AV

GPIO 26pin

CSI connector

(Camera input) 

DSI Connector

(Video output)

4x USB 2.0

HDMI

Analog AV 4 pole 3.5mm jack

GPIO 40pin

CSI connector

(Camera input) 

DSI Connector

(Video output)

4x USB 2.0

mini HDMI

Analog AV 4 pole 3.5mm jack

GPIO 40pin

CSI connector

(Camera input) 

DSI Connector

(Video output)

4x USB 2.0

mini HDMI

Analog AV 4 pole 3.5mm jack

GPIO 40pin

CSI connector

(Camera input) 

DSI Connector

(Video output)

Networking 10/100 Mbit ethernet via USB 10/100 Mbit ethernet via USB 10/100 Mbit ethernet via USB

Network: 10/100 MBPS Ethernet

802.11n Wireless LAN

Bluetooth 4.0

Price US$ US$35 US$25 US$35 US$35

 

 

 

 

 

 

 

 

 

 

 

 

 

You can buy a Raspberry pi3 online at Rapid here.

So there you have it. Do we need another Rpi in the ecosystem? Im not sure.

My personal opinion is that its far to soon since the last release for a major upgrade. Im still not ready to decommission my last raspberry Pi and upgrade, while this one does have wifi and bluetooth onboard as well as a faster CPU and GPU I may give this one a skip for now. there are many single board computers on the market these days with similar or even better specs than the RPI3

In my honest opinion my money is on the Pine64+ which will be available soon

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