Counter ICs

A Shift Register is a sequential logic device made up of a cascade of flip-flops, through which a sequence of bits are ’shifted’. These devices are commonly used to convert between serial and parallel interfaces.

How it works – basic example

In a Shift Register the output of each flip-flop is connected to the input of the next flip-flop in the cascade. With each cycle of the connected clock, the bits are ’shifted’ down the cascade by one flip-flop.

A simple analogy to understand the basic theory or operation would be to consider a glass tube with an opening both ends, and placing a ball marked ’0’ or ’1’ into one end of the tube at a regular intervals.

As each ball is placed into the tube, all the balls are ’shifted’ along by one position. The sequence in which the balls marked ’0’ and ’1’ where fed in is preserved. Also each time one ball is fed in, the ball that has been in the cascade the longest drops out. So if the tube can contain 4 balls at any one time, this could be described as a 4-bit Shift Register.

Common Types of Shift Register

• Serial-in serial-out (SISO) – In this type of Shift Register, the data input and output is serial. With each clock cycle a new bit is fed into the cascade, with the bit furthest along the cascade exiting as an output. So in a 4-bit register, the output trails the input by 4 clock cycles. This matches the simple example above, with the ball that exits the tube being the output.

• Serial-in parallel-out (SIPO) – In this configuration data is converted from serial into parallel format. As described for the SISO variant above, data is fed in serially and shifted down the cascade, the difference is that each flip-flop has an output, allowing the entire bit array to be output simultaneously as a parallel output. This may be done using a latched of buffered output.

• Parallel-in serial-out (PISO) – This variant takes a parallel input and converts into a serial output. To do this the shift register must implement a write/shift sequence. The parallel data input is (written) into each flip-flop of the array simultaneously in one clock cycle, then for the next cycles the register goes into shift mode as the bits are shifted down the flip-flop cascade, being output as serial data. The process then repeats.

• Parallel-in parallel-out (PIPO) – This type of register differs slightly from the others in that inputs and outputs of each flip-flop in the array are not interconnected. Each flip-flop takes one bit of the parallel input, stores it for a cycle, and then outputs the data simultaneously with the other flip-flops in the register, creating a parallel output that matches the input. Like the SISO type above, PIPO variants can be used to temporarily store data, or act a time delay device.

• Universal Shift Register – A configurable Shift Register that can be programmed to act as a SISO, SIPO, PISO or PIPO device, often on the fly.

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Beskrivning Pris Package Type Logic Function Number of Stages Logic Family Mounting Type Counter Type Operation Mode Number of Elements Pin Count Minimum Operating Supply Voltage Maximum Operating Supply Voltage Dimensions Length Width
RS-artikelnummer 145-0854
Tillv. art.nrCD4020BE
VarumärkeTexas Instruments
3,851 kr
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PDIP Counter, Divider 14 4000 Through Hole Binary Up Counter 1 16 3 V 18 V 19.3 x 6.35 x 4.57mm 19.3mm 6.35mm
RS-artikelnummer 662-9562
Tillv. art.nrCD4020BE
VarumärkeTexas Instruments
4,632 kr
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PDIP Counter, Divider 14 4000 Through Hole Binary Up Counter 1 16 3 V 18 V 19.3 x 6.35 x 4.57mm 19.3mm 6.35mm
RS-artikelnummer 144-9931
Tillv. art.nrCD4024BE
VarumärkeTexas Instruments
3,904 kr
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PDIP Counter, Divider 7 4000 Through Hole Binary Up Counter 1 14 3 V 18 V 19.3 x 6.35 x 4.57mm 19.3mm 6.35mm
RS-artikelnummer 732-0691
Tillv. art.nrCD4017BEE4
VarumärkeTexas Instruments
5,294 kr
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PDIP Counter, Divider 5 CMOS Through Hole Decade Up Counter 1 16 3 V 18 V 19.69 x 6.6 x 4.57mm 19.69mm 6.6mm
RS-artikelnummer 921-5166
Tillv. art.nrCD4017BEE4
VarumärkeTexas Instruments
3,842 kr
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PDIP Counter, Divider 5 CMOS Through Hole Decade Up Counter 1 16 3 V 18 V 19.69 x 6.6 x 4.57mm 19.69mm 6.6mm
RS-artikelnummer 663-2782
Tillv. art.nrSN74LV8154PW
VarumärkeTexas Instruments
10,816 kr
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TSSOP Counter 8 LV Surface Mount Binary Up Counter 2 20 2 V 5.5 V 6.5 x 4.4 x 1.15mm 6.5mm 4.4mm
RS-artikelnummer 145-6407
Tillv. art.nrSN74LV8154PW
VarumärkeTexas Instruments
9,251 kr
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TSSOP Counter 8 LV Surface Mount Binary Up Counter 2 20 2 V 5.5 V 6.5 x 4.4 x 1.15mm 6.5mm 4.4mm
RS-artikelnummer 662-9613
Tillv. art.nrCD4035BE
VarumärkeTexas Instruments
12,862 kr
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PDIP Shift Register 4 4000 Through Hole - Serial/Parallel to Parallel 1 16 3 V 18 V 19.3 x 6.35 x 4.57mm 19.3mm 6.35mm
RS-artikelnummer 145-0419
Tillv. art.nrCD4035BE
VarumärkeTexas Instruments
10,646 kr
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PDIP Shift Register 4 4000 Through Hole - Serial/Parallel to Parallel 1 16 3 V 18 V 19.3 x 6.35 x 4.57mm 19.3mm 6.35mm
RS-artikelnummer 144-9896
Tillv. art.nrSN74LS393N
VarumärkeTexas Instruments
9,364 kr
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PDIP Counter, Divider 4 LS Through Hole Binary Up Counter 2 14 4.75 V 5.25 V 19.3 x 6.35 x 4.57mm 19.3mm 6.35mm
RS-artikelnummer 662-6850
Tillv. art.nrCD4060BPWR
VarumärkeTexas Instruments
3,143 kr
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TSSOP Counter, Divider 14 4000 Surface Mount Binary Up Counter 1 16 3 V 18 V 5 x 4.4 x 1.15mm 5mm 4.4mm
RS-artikelnummer 663-2105
Tillv. art.nrSN74HC4040PW
VarumärkeTexas Instruments
5,149 kr
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TSSOP Counter 12 HC Surface Mount Binary Up Counter 1 16 2 V 6 V 5 x 4.4 x 1.15mm 5mm 4.4mm
RS-artikelnummer 662-6838
Tillv. art.nrCD4015BPWR
VarumärkeTexas Instruments
1,358 kr
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TSSOP Shift Register 4 4000 Surface Mount - Serial to Parallel 2 16 3 V 18 V 5 x 4.4 x 1.15mm 5mm 4.4mm
RS-artikelnummer 162-6923
Tillv. art.nrCD4060BPWR
VarumärkeTexas Instruments
1,317 kr
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TSSOP Counter, Divider 14 4000 Surface Mount Binary Up Counter 1 16 3 V 18 V 5 x 4.4 x 1.15mm 5mm 4.4mm
RS-artikelnummer 145-0191
Tillv. art.nrCD4015BEE4
VarumärkeTexas Instruments
2,242 kr
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PDIP Shift Register 4 4000 Through Hole - Serial to Parallel 2 16 3 V 18 V 19.3 x 6.35 x 4.57mm 19.3mm 6.35mm
RS-artikelnummer 922-2896
Tillv. art.nrCD4017BM
VarumärkeTexas Instruments
3,748 kr
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SOIC Counter, Divider 5 4000 Surface Mount Decade Up Counter 1 16 3 V 18 V 9.9 x 3.91 x 1.58mm 9.9mm 3.91mm
RS-artikelnummer 709-1971
Tillv. art.nrSN74HC164NE4
VarumärkeTexas Instruments
4,094 kr
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PDIP Shift Register 8 HC Through Hole - Serial to Parallel 1 14 2 V 6 V 19.3 x 6.35 x 4.57mm 19.3mm 6.35mm
RS-artikelnummer 100-0763
Tillv. art.nrSN74HC595N
VarumärkeTexas Instruments
4,012 kr
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PDIP Shift Register 8 HC Through Hole - Serial to Parallel 1 16 2 V 6 V 19.3 x 6.35 x 4.57mm 19.3mm 6.35mm
RS-artikelnummer 145-0892
Tillv. art.nrSN74HC4040PW
VarumärkeTexas Instruments
4,681 kr
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TSSOP Counter 12 HC Surface Mount Binary Up Counter 1 16 2 V 6 V 5 x 4.4 x 1.15mm 5mm 4.4mm
RS-artikelnummer 144-9993
Tillv. art.nrSN74HC164NE4
VarumärkeTexas Instruments
3,16 kr
Each (In a Tube of 25)
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PDIP Shift Register 8 HC Through Hole - Serial to Parallel 1 14 2 V 6 V 19.3 x 6.35 x 4.57mm 19.3mm 6.35mm