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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Description Price 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 Stock No. 162-6915
Mfr. Part No.CD40103BNSR
HK$6.162
Each (On a Reel of 2000)
units
SOP Counter 8 4000 Surface Mount Binary Down Counter 1 16 3 V 18 V 10.3 x 5.3 x 1.95mm 10.3mm 5.3mm
RS Stock No. 662-7033
Mfr. Part No.CD74HC161M96
HK$3.647
Each (In a Pack of 10)
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SOIC Counter 4 HC Surface Mount Binary Up Counter 1 16 2 V 6 V 9.9 x 3.91 x 1.58mm 9.9mm 3.91mm
RS Stock No. 808-0098
Mfr. Part No.MC74HC164ADTR2G
HK$1.09
Each (On a Tape of 200)
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TSSOP Shift Register 8 HC Surface Mount - Serial to Parallel 1 14 2 V 6 V 5.1 x 4.5 x 1.05mm 5.1mm 4.5mm
RS Stock No. 662-7109
Mfr. Part No.CD74HC390M96
HK$4.313
Each (In a Pack of 10)
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SOIC Counter, Divider 4 HC Surface Mount Decade Up Counter 2 16 2 V 6 V 9.9 x 3.91 x 1.58mm 9.9mm 3.91mm
RS Stock No. 660-7486
Mfr. Part No.TPIC6595DWR
HK$24.008
Each (In a Pack of 5)
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SOIC Shift Register 8 - Surface Mount - Serial to Serial/Parallel 1 20 4.5 V 5.5 V 12.8 x 7.52 x 2.35mm 12.8mm 7.52mm
RS Stock No. 171-3005
Mfr. Part No.74HC595D
BrandToshiba
HK$0.942
Each (On a Reel of 2500)
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SOIC Shift Register - 74HC Surface Mount - Serial to Parallel 1 16 2 V 6 V 10.2 x 3.9 x 1.38mm 10.2mm 3.9mm
RS Stock No. 333-4615
Mfr. Part No.CD74HCT390E
HK$4.00
Each (In a Tube of 25)
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PDIP Counter, Divider 4 HCT Through Hole Decade Up Counter 2 16 4.5 V 5.5 V 19.3 x 6.35 x 4.57mm 19.3mm 6.35mm
RS Stock No. 791-8753
Mfr. Part No.74HC595BQ,115
BrandNexperia
HK$1.358
Each (In a Pack of 50)
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VQFN Shift Register 8 HC Surface Mount - Serial to Serial/Parallel 1 16 2 V 6 V 3.6 x 2.6 x 0.95mm 3.6mm 2.6mm
RS Stock No. 305-080
Mfr. Part No.SN74LS92N
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PDIP Counter, Divider 4 LS Through Hole Decade Up Counter 1 14 4.75 V 5.25 V 19.3 x 6.35 x 4.57mm 19.3mm 6.35mm
RS Stock No. 806-1567
Mfr. Part No.MC74HC4040ADTR2G
HK$3.12
Each (On a Tape of 25)
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TSSOP Counter 12 MC74 Surface Mount Binary Up Counter 1 16 2 V 6 V 5.1 x 4.5 x 1.05mm 5.1mm 4.5mm
RS Stock No. 663-1978
Mfr. Part No.SN74HC164PW
HK$2.663
Each (In a Pack of 10)
units
TSSOP Shift Register 8 HC Surface Mount - Serial to Parallel 1 14 2 V 6 V 5 x 4.4 x 1.15mm 5mm 4.4mm
RS Stock No. 662-8219
Mfr. Part No.SN74HC4020DR
HK$3.552
Each (In a Pack of 10)
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SOIC Counter 14 HC Surface Mount Binary Up Counter 1 16 2 V 6 V 9.9 x 3.91 x 1.58mm 9.9mm 3.91mm
RS Stock No. 663-0095
Mfr. Part No.CD74HC164E
HK$4.089
Each (In a Pack of 10)
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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 Stock No. 663-1984
Mfr. Part No.SN74HC165PW
HK$3.20
Each (In a Pack of 10)
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TSSOP Shift Register 8 HC Surface Mount - Parallel to Serial 1 16 2 V 6 V 5 x 4.4 x 1.15mm 5mm 4.4mm
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Mfr. Part No.SN74HC161PW
HK$1.542
Each (In a Tube of 90)
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TSSOP Counter 4 HC Surface Mount Binary Up Counter 1 16 2 V 6 V 5 x 4.4 x 1.15mm 5mm 4.4mm
RS Stock No. 145-1240
Mfr. Part No.SN74AHCT595D
HK$2.397
Each (In a Tube of 40)
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SOIC Shift Register 8 AHCT Surface Mount - Serial to Serial/Parallel 1 16 4.5 V 5.5 V 9.9 x 3.91 x 1.58mm 9.9mm 3.91mm
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Mfr. Part No.NJU3730R-TE1
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VSP Shift Register - - Surface Mount - Serial to Parallel 1 8 2.4 V 5.5 V 2.9 x 2.8 x 1.1mm 2.9mm 2.8mm
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Mfr. Part No.74HC4094D,653
BrandNexperia
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Each (On a Reel of 2500)
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SO - 8 74HC Surface Mount - Serial to Serial/Parallel 1 16 2 V 6 V 10 x 4 x 1.45mm 10mm 4mm
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Mfr. Part No.TC74HC4020AP(F)
BrandToshiba
HK$8.384
Each (In a Pack of 5)
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PDIP Counter 14 HC Through Hole Binary Up Counter 1 16 2 V 6 V 19.25 x 6.4 x 3.5mm 19.25mm 6.4mm
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PDIP Counter 4 LS Through Hole Binary Up Counter 1 16 4.75 V 5.25 V 19.3 x 6.35 x 4.57mm 19.3mm 6.35mm