The 74hc595 has 8 output đầu ra pins out of which 7 are these pins. They can be controlled serially
8
Ground
Connected to the Ground of the circuit
9
(Q7) Serial Output
This pin is used khổng lồ connect more than one 74hc595 as cascading
10
(MR) Master Reset
Resets all outputs as low. Must be held high for normal operation
11
(SH_CP) Clock
This is the clock pin lớn which the clock signal has to be provided from MCU/MPU
12
(ST_CP) Latch
The Latch pin sạc is used to update the data lớn the output đầu ra pins. It is active high
13
(OE) output Enable
The output đầu ra Enable is used to lớn turn off the outputs. Must be held low for normal operation
14
(DS) Serial Data
This is the pin to lớn which data is sent, based on which the 8 outputs are controlled
15
(Q0) Output
The first output pin.
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16
Vcc
This sạc powers the IC, typically +5V is used.
Features
8-bit, Serial In – Parallel out Shift registerOperating Voltage: 2V khổng lồ 6VPower Consumption: 80uAOutput source/sink current: 35mAOutput Voltage is equal to Operating voltageMinimum high-level input đầu vào Voltage: 3.15V(Vcc=4.5V)Maximum low-level input Voltage: 1.35V
(Vcc=4.5V)Can be easily cascaded with more IC khổng lồ get more outputsMaximum Clock Frequency: 25Mhz
4.5VAvailable in 16-pin PDIP, GDIP, PDSO packages
Note: Complete technical details can be found in the 74HC595datasheet given at the over of this page.
Alternatives Shift Registers
S.No: | Name | Type |
1 | 4035 | 4-Bit Parallel in Parallel out Shift Register |
2 | 74LS379 | Quad Parallel Shift Register |
3 | 4014 | 4 Bit static shift register |
4 | 74LS166 | 8 Bit Shift Register |
5 | 74LS323 | 8 Bit Shift/Storage Register |
6 | 74LS164 | S/P Shift Register |
7 | 4015 | Dual 4 Bit Static Register |
8 | 74LS299 | 8 Bit Shift/Storage Register |
Where to Use 74HC595 IC
The 74HC595 is an 8-bit Serial In – Parallel Out Shift Register, i.e. It can receive (input) data serially & control 8 output đầu ra pins in parallel. This comes in very handy where vì chưng not have enough GPIO pins on our MCU/MPU khổng lồ control the required number of outputs. It is often used in projects where relatively a large number of LED’s has khổng lồ be controlled through the Microcontroller. It can also be used to interface LCD screen since they can acts as the data bit for the LCD displays. It can also be used lớn control 5V loads lượt thích relays through a 3.3V microcontroller since the high-level voltage is only 3.15. So if you are looking for an IC to save on your GPIO pins on the Microcontroller, then this IC might be the right choice for you.
How to Use a 74HC595 IC
The 74HC595 shift register is commonly used with microcontrollers or microprocessors khổng lồ expand the GIPO functionalities. It requires only 3 pins connected khổng lồ the MCU, which are Clock, Data, và Latch. It has a wide operating voltage from 2V to 6V. An application circuit of the IC is shown below:
The pins 11, 14 & 12 are connected to lớn the GPIO pins of the Microcontroller. In which pin 11 is the clock which sends a constant pulse lớn keep timing. The sạc pin 14 is Data which actually sends the Data about which output pins has to lớn stay low và which should go high. The sạc 12 is the Latch which updates the received the data to the output pins when made high, this pin sạc can also be permanently held high.The below image will help you understand better.
As you can see the clock is continues train of pulses, and the data goes high only at the respective place where the output has lớn get high. Here for example the binary value 0b10110011 is passed khổng lồ the microcontroller. The sạc pin Master reset (MR) is used lớn reset the outputs, when not in use it is held high khổng lồ vcc, similarly the sạc pin should be held low when not in use.
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Another important advantage of the 74hc595 IC is that it can be cascaded to lớn control more than 8 outputs. To vị this, we use the Q7’ (pin 9), this sạc should be connected khổng lồ the data sạc of the second 74HC595 IC. This way the first 8-bit sent from MCU will be used by the 1st IC và the second 8-bit will be used by the 2nd IC.